CAI 750 Operator's Manual
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CAI 750 Operator's Manual

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700 CLD / O2
2-25-2021
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Summary of Contents for CAI 750

  • Page 1 700 CLD / O2 2-25-2021...

  • Page 2: Table Of Contents

    700 CLD / O2 2-25-2021 Table of Contents Introduction ........................... 5 Analyzer Specifications ......................8 Installation ........................... 10 Safety Information ......................10 Startup and Shutdown ......................20 Using the Keypad ........................22 Menu Flow Chart ........................24 Main Menu ........................... 32 Measure Screen .........................
  • Page 3 700 CLD / O2 2-25-2021 Range Setup ........................82 Range Limits ........................... 83 Auto Range On/Off ......................... 85 AutoRange Switch Points ....................... 86 Diagnostics ........................87 Diagnostic Values ........................88 Raw Values Display ........................ 90 I/O Status ..........................92 Analyzer Digital Outputs ..................... 93 Analyzer Digital Inputs ......................
  • Page 4 700 CLD / O2 2-25-2021 Instruction Command ......................149 Error Handling ........................151 General AK Requirements ....................152 Scan Commands ........................154 Control Commands ....................... 165 Configuration Commands ..................... 169 Modbus Protocol ......................175 MBAP Description ........................ 175 MBAP Header Description ....................176 Modbus Command Function Codes ..................

  • Page 5: Introduction

    Support for assistance. We want you to be among our thousands of satisfied customers. Description The CAI 750 CLD Analyzer is an exceptionally accurate chemiluminescent (CLD) gas analyzer designed for measuring oxides of nitrogen in gas samples. The 750 model also includes a paramagnetic oxygen channel. Features...

  • Page 6: Operating Principle

    700 CLD / O2 2-25-2021 Operating Principle The California Analytical Instruments CLD Analyzer utilizes the principle of chemiluminescence for analyzing the NO, NO or NO concentration within a gaseous sample. It uses paramagnetic technology for measurement of oxygen. In the NO mode, the measurement is based upon the chemiluminescent reaction between ozone and nitric oxide (NO) yielding nitrogen dioxide (NO ) and oxygen.

  • Page 7: Flow System

    700 CLD / O2 2-25-2021 Flow System The flow system’s basic function is to deliver highly regulated flows of sample and air or to the ozonator and reaction chamber assemblies. The EPC (electronic proportional control) valve delivers approximately 15 PSIG (Standard without ozone pump option) to a pre-set capillary and consequently accurately predetermines the ozone flow rate.

  • Page 8: Analyzer Specifications

    700 CLD / O2 2-25-2021 Analyzer Specifications Specifications are subject to change without notice. Detector: Chemiluminescence (CLD) Photodiode (thermally stabilized with Peltier cooler). NO/NO Ranges: Four operator-definable ranges from 0-3 to 0-3,000 ppm standard (consult factory for other ranges). Paramagnetic O : Ranges 0-25%.
  • Page 9 700 CLD / O2 2-25-2021 Special Features: • Calculated NO derived from NO converter efficiency • Auto ranging • Auto calibration (adjustable through internal clock) • < 3 cc gold-plated reaction chamber Display: 3” x 5” backlit LCD. Sample Temperature: Up to 50°C non-condensing sample. Ambient Temperature: 5 to 40°C.

  • Page 10: Installation

    700 CLD / O2 2-25-2021 Installation Safety Information Safety Alert Temperature Hazard Electrical Shock Hazard Caution or Warning Caution or Warning Caution or Warning Note, Caution and Warning symbols appear on the instrument and in this manual to draw your attention to important operational and safety information. A “NOTE”...

  • Page 11: Electrical Shock Hazard

    700 CLD / O2 2-25-2021 symbol (a lightning bolt in a triangle) precedes an electrical shock hazard CAUTION or WARNING statement. Some or all of the above symbols may appear in this manual or on the equipment. This manual should be consulted whenever one of these symbols is encountered on the equipment.
  • Page 12 700 CLD / O2 2-25-2021 Oven: There are valves and a pump head that penetrate the oven wall. These parts at the exterior wall range in temperature from 50°C to 60°C. ALWAYS ALLOW OVEN TO COOL TO ROOM TEMPERATURE BEFORE PROCEEDING WITH SERVICE.

  • Page 13: Unpacking Instructions

    The shipping container and packaging are specially designed to protect the analyzer in transport. If you ever need to return the analyzer to CAI for repair or any other reason, the original shipping container and packaging should be used.

  • Page 14: Rack Mounting

    700 CLD / O2 2-25-2021 Rack Mounting The front panel is designed for mounting into a standard 19-inch rack enclosure. Holes are located on the left and right side to allow the panel to be secured in the rack by screws.

  • Page 15: Site Selection And Mounting

    5. The instrument is designed for rack mounting. Optional rack-mount slides are available. 6. Do not install the 750 CLD analyzer near equipment that emits electromagnetic interference (EMI). NOTE: A front and rear supporting brace or equivalent is required if the optional rack mount slides were not purchased.

  • Page 16: Output Connections

    700 CLD / O2 2-25-2021 Electrical All wiring is connected at the rear of the analyzer. The AC power cord is connected to the power entry as shown below: Fuse Panel Power ON/OFF Switch Power Entry AC Power Switch, Connector and Fuse. NOTE: A defective ground may affect the analyzer’s operation.

  • Page 17: Gas Handling Equipment

    700 CLD / O2 2-25-2021 inlet. Gases introduced through a calibration port should be at 20-25 PSIG. If introduced through the sample port, pressures should be as follows: 1. Without sample pump, pressure should be 10-25 PSIG. 2. With sample pump – no pressure. 3.

  • Page 18: Sampling Requirements

    700 CLD / O2 2-25-2021 Sampling Requirements Filtration Dust must be eliminated completely in the sample stream. Use filters as necessary. The final filter must be capable of removing any particles larger than 4 microns. Condensation The dew point of the sample gases must be lower than the instrument temperature to prevent accidental condensation within the instrument.
  • Page 19 700 CLD / O2 2-25-2021 If the analyzer does not contain an optional internal sample pump, the sample gas entering the instrument should be at a pressure between 10 and 25 PSIG with a flow capacity at a minimum of 3 liters/min. If the analyzer is using the optional sample pump, do not introduce a pressurized sample.

  • Page 20: Startup And Shutdown

    Refer to the Using the Keypad section and review the complete Operator’s Manual for detailed instructions for proper setup and operation of the 750 CLD. Shutdown Procedure 1. Turn off the valves on the zero, span and air cylinders. 2. If the analyzer contains the optional internal sample pump, disconnect the sample line from the rear inlet port.

  • Page 21: Proper Storage

    700 CLD / O2 2-25-2021 Proper Storage After power down, allow the heated analyzer components to cool to room temperature before preparing for storage. If the original shipping box was retained, the analyzer should be stored in the box in the packing material supplied.

  • Page 22: Using The Keypad

    700 CLD / O2 2-25-2021 Using the Keypad When the Measure screen is displayed, the ten Function keys (F1 through F10) are shortcuts to commonly used screens. On other screens, these keys can either be used as function keys or to enter numeric values. This is why each number key includes both the larger Function number at the top (for example, F1) and the smaller number underneath for numeric value (for example, 1).
  • Page 23 700 CLD / O2 2-25-2021 From any screen, the Measure key takes you to the Measure screen. The current measurement is being displayed. The Enter key: 1. In Function mode, the Enter key selects the highlighted function. 2. When a field is highlighted for numeric input, pressing the Enter key opens the selected field for numeric entry with a blinking cursor.

  • Page 24: Menu Flow Chart

    Menu Flow Chart The menu flow chart is a handy reference that will help you familiarize yourself with the operation of the CAI System 750 CLD Analyzer. Start by pressing to access the Main Menu to quickly find any screen.
  • Page 25 700 CLD / O2 2-25-2021 Calibration Menu Main Menu Menus Calibration Manual Automated Cal Gas Calibration Calibration Reset Factory Calibration Calibration Concentration Setup Factors Settings Initiate Manual Auto Cal Reset Zero NOx Sequenced Cal Deviations Schedule Offset and Gain Zero Gas Initiate Span NOx Auto Cal...

  • Page 26: Range Setup

    700 CLD / O2 2-25-2021 Range Setup Menu Main Menu Menus Range Setup AutoRange AutoRange Range Limits On/Off Switch Points AutoRange On AutoRange Off Security Level Legend Security Level 1 STANDARD Security Level 2 SETUP Security Level 3 FACTORY...
  • Page 27 700 CLD / O2 2-25-2021 Diagnostics Menu Main Menu Menus Diagnostics Diagnostic Raw Value I/O Status Status Line Values Display Analyzer Digital Turn Status Line ← Temps → Outputs ← Press → ← → ← Flows → Analyzer Digital Turn Status Line Inputs Programmable Digital Outputs...
  • Page 28 700 CLD / O2 2-25-2021 Setup Menu Main Menu Menus Setup Data Logging Auto Start Measure Output TCP/IP Clock Time Settings Settings Settings Parameters Averaging Programmable Programmable Time Analogs Digitals NO/NOx/NO Output Output Output Output Mode Times Assignments Assignments Hold/Clear Test NOx Correction Output...
  • Page 29 700 CLD / O2 2-25-2021 Alarms Menu Main Menu Menus Alarms Alarm Display Current Alarms Alarm Log Alarm Limits On/Off Turn Alarm Temperatures Display On Turn Alarm Pressures Display Off EPC Voltages Concentrations Security Level Legend Security Level 1 STANDARD Security Level 2 SETUP...
  • Page 30 700 CLD / O2 2-25-2021 Service Menu Main Menu Menus Service Linear Service Menu Coefficients Range 1 Range 2 Range 3 Range 4 Security Level Legend Security Level 1 STANDARD Security Level 2 SETUP Security Level 3 FACTORY...
  • Page 31 700 CLD / O2 2-25-2021 Security Menu Main Menu Menus Security Operator Levels Reset Password Change Password Standard Functions Setup Functions Factory Functions Security Level Legend Security Level 1 STANDARD Security Level 2 SETUP Security Level 3 FACTORY...

  • Page 32: Main Menu

    The Main Menu is your gateway to operational, setup and maintenance functions on the 750 CLD Analyzer via the corresponding function keys. All software functions of the 750 CLD Analyzer can be reached via the menu above from the Main Menu screen. Operation starts by pressing the Menu key to bring up the Main Menu.

  • Page 33: Measure Screen

    700 CLD / O2 2-25-2021 Measure Screen Screen Name Current Range AK Status Line Measured Concentration Second Log On Analyzer Mode Shortcut Menu Range Limit Current Time & Active Alarms Keypad Status The Measure Screen provides a visual of the current concentration of the gas being analyzed, along with other pertinent information.
  • Page 34 700 CLD / O2 2-25-2021 AK Status Line: When the AK Status line is enabled, it will scroll through the analyzer’s present state using AK Protocol. See Protocol. Analyzer Mode: The active mode the analyzer is in (NO, NO or NO/NO Measured Concentration: The current concentration that is displayed on the screen.
  • Page 35 700 CLD / O2 2-25-2021 Diags Diagnostic Values is used to view Temperatures, Pressures, EPC Percent Full scale and Flows. Auto Range Allows operators to turn Auto Range On or Off. Manual Cal Allows operators to Zero or Span the analyzer from the Manual Calibration menu. Menus The Menus screen is the starting point for advanced setup and functions.

  • Page 36: Measure Mode

    700 CLD / O2 2-25-2021 Measure Mode → → The Measure Mode menu is used to select one of three measurement modes: NO, NOx or NO/NOx/NO . The Measure Mode menu is accessed by pressing the on the Main Menu. This menu will affect how the analyzer operates and what is displayed in the Measure screen.

  • Page 37: No Mode

    700 CLD / O2 2-25-2021 NO Mode → → To move to the NO mode, press while in the Measure Mode menu. In NO mode, the sample gas does not pass through the analyzer’s NO converter. The final reading is NO only.

  • Page 38: No X /No 2 Mode

    700 CLD / O2 2-25-2021 NO/NO Mode → → The NO/NO mode activates the “sample and hold” feature which allows the analyzer to automatically cycle between NO and NO measurement. To change to the NO/NO mode, press from the Measure Mode menu. The current measuring mode (cycle) is indicated above the analyzer range.

  • Page 39: Analyzer Info

    2-25-2021 Analyzer Info → The Analyzer Info screen contains the basic identity of your 750 CLD Analyzer. The Analyzer Info screen is accessed by pressing the key on the Main Menu. This screen includes the Model and Serial Number of your analyzer (for easy identification if you are discussing your analyzer with CAI), factory settings for sample pressure and air pressure, and the software versions being used.

  • Page 40: Remote/Manual

    700 CLD / O2 2-25-2021 Remote/Manual → The Remote/Manual menu gives the operator the ability to control the instrument manually using the keypad or via a remote computer. The Remote/Manual menu is accessed by pressing the key on the Main Menu. The current setting (Remote Mode) is displayed in the upper right-hand corner of the screen.

  • Page 41: Standby

    → When the analyzer is in Standby Mode, the pump is turned off and the solenoid valves are closed. The CAI logo is displayed along with the Serial Number. Standby mode is accessed by pressing the key from the Main Menu.

  • Page 42: Menus

    700 CLD / O2 2-25-2021 Menus → → The Menus screen provides access to most instrument features, including Calibration, Setup and Diagnostics. From the Main Menu press to bring up the Menus screen. Press to access the Calibration menus. Press to access the Range Setup menu.

  • Page 43: Calibration

    2-25-2021 Calibration → → The 750 CLD Analyzer requires initial calibration with zero and span calibration standards before operation. These calibrations can be performed manually or initiated automatically. From the Menus screen press to access the Calibration menu. The Calibration menu includes important features including basic setup for both manual and automated calibration.

  • Page 44: Manual Calibration

    700 CLD / O2 2-25-2021 Manual Calibration Whether you are calibrating a single range or multiple ranges, each range requires its own complete zero and span calibration. If you are calibrating multiple ranges during one session, the zero calibrations can all be performed before any of the span calibrations, as long as they are within the same relatively short time period.

  • Page 45: Or No X Mode

    700 CLD / O2 2-25-2021 Manual Calibration NO or NO Mode → → → → When a manual calibration is performed in Single Mode operation (NO or NO mode), the analyzer will remain in that mode during calibration. In Single Mode operation the analyzer can only be calibrated for one mode.

  • Page 46: Zero

    700 CLD / O2 2-25-2021 Zero → → → → Zero calibration should be performed before a span calibration. From the Manual Calibration menu, press to access the Manual Zero Calibration screen. Make sure the analyzer is in the range you wish to calibrate. Use the Up/Down arrows to go to the desired range.
  • Page 47 700 CLD / O2 2-25-2021 When the concentration value has stabilized, press to set the zero calibration. The zero portion of the calibration should now be complete. If the calibration was successful, the screen will say ***Saved Current*** above the concentration value.
  • Page 48 700 CLD / O2 2-25-2021 If the zero calibration is unsuccessful, check the following: 1. Make sure the correct gas was introduced into the analyzer. 2. Verify the Diagnostic Values while flowing gas. 3. Check Zero Gas Deviations under Manual Deviations: →...

  • Page 49: Span

    700 CLD / O2 2-25-2021 Span → → → → A span calibration should be performed after a successful zero calibration. From the Manual Calibration menu press to access the Manual Span Calibration screen. Make sure the highlighted span gas value (see above) matches the value on the certificate for the span calibration gas being supplied to the analyzer.
  • Page 50 700 CLD / O2 2-25-2021 When the concentration number has stabilized, press to set the span calibration. The calibration should now be complete. If the span calibration was successful, the screen will say ***Saved Current***. If the calibration was unsuccessful, the screen will say Outside Deviation Limits. See the Manual Zero Calibration section for examples of screens showing successful and unsuccessful calibrations.

  • Page 51: No X /No 2 Mode

    700 CLD / O2 2-25-2021 Manual Calibration NO/NO Mode → → → → When performing a calibration in Switching mode (NO/NO mode), the operator has the option of using basic calibration in NO mode or advanced calibration to create NO Correction Factors using NO and NO modes.

  • Page 52: Automated Calibration

    700 CLD / O2 2-25-2021 Automated Calibration → → → An automated calibration is a timed zero calibration immediately followed by a timed span calibration. The Automated Calibration menu offers two choices: Sequenced Calibration and Sequenced Check of the existing calibration. The Automated Calibration menu is accessed by pressing from the Calibration menu.
  • Page 53 700 CLD / O2 2-25-2021 • This automated calibration is triggered manually and not by the analyzer’s clock or via remote signal. A fully automated sequenced calibration can be preset to include the desired interval for recurring analyzer-initiated calibrations. This requires additional setup.

  • Page 54: Initiate Sequenced Cal

    700 CLD / O2 2-25-2021 Initiate Sequenced Cal → → → → Because of timing requirements, sequenced calibrations are generally only used when the analyzer is controlling the flow of zero and span gases into the analyzer. To initiate a sequenced calibration, press from the Automated Calibration menu.
  • Page 55 700 CLD / O2 2-25-2021 1. Zero Range 1 Purging – Allows time for the zero gas to flush out any residual gases that may still be present in the detection path. 2. Zero Range 1 Calibrating – The calculated averaged zero is set as the new offset value, as long as it is within the Maximum Calibration Error limits.

  • Page 56: Initiate Sequenced Check

    700 CLD / O2 2-25-2021 Initiate Sequenced Check → → → → Initiate Sequenced Check is a useful tool for setting up Auto Calibration. From the Auto Calibration Menu screen, pressing initiates a sequenced calibration check. Rather than initiating a calibration, it checks the validity of your most current calibration. A sequenced calibration check performs all of the steps of a sequenced calibration with the exception of the zero and span calibrations.

  • Page 57: Cal Gas Concentrations

    700 CLD / O2 2-25-2021 Cal Gas Concentrations → → → → The Cal Gas Concentrations Screen allows operators to change calibration gas values for multiple ranges on one screen. To access the Cal Gas Concentrations screen (shown above) press from the Calibration Menu.

  • Page 58: Calibration Setup

    700 CLD / O2 2-25-2021 Calibration Setup → → → The Calibration Setup menu provides all the parameters necessary for completing a successful calibration. To access the Calibration Setup menu, select from the Calibration menu. All parameters on the Calibration Setup menu apply to Automated Calibration. The following also apply to Manual Calibration: Cal Pump/Valves, Auto Cal/Check, Deviation Limits and Analog Hold on Cal.

  • Page 59: Auto Calibration Schedule

    700 CLD / O2 2-25-2021 Auto Calibration Schedule → → → → Next Scheduled Scheduled Screen Name Calibration Time and Date Calibration Interval Save Hourly, Daily or Current Date and AutoCal On / Off Weekly Time The Auto Calibration Schedule screen allows the operator to run automated calibrations using the analyzer’s internal clock.
  • Page 60 700 CLD / O2 2-25-2021 Use the arrow buttons to move the highlight to changeable fields (in the example, Start Time: 12). Press to open the field and change the value. Press again to close the field after you have made your changes. After all the changes have been made, you must choose one of the following: (Hourly), (Daily) or...

  • Page 61: Auto Calibration Parameters

    Then select a range (from 1 – 4) for calibration. To select all ranges, press 0. Press to close the field. The second parameter the operator can change is the Mode. The 750 CLD analyzer can calibrate in either NO or NOx mode. Press to open the field and select the mode using the up/down arrows .
  • Page 62 700 CLD / O2 2-25-2021 Calibration Gases gives you a choice of calibrating with Zero gas only or All calibration gases (zero and span gases). Press to open the field and change the parameter using the up/down arrows . Press to close the field.

  • Page 63: Calibration Via Pump/Valves

    700 CLD / O2 2-25-2021 Calibration Via Pump/Valves → → → → The use of Cal via Pump/Valves depends upon how calibration gases are being introduced into the analyzer – via a sample pump or internal valves (if equipped with internal valve option). The existing setting (Valves in the example) is shown at the top right of the menu.

  • Page 64: Auto Calibration/Check

    700 CLD / O2 2-25-2021 Auto Calibration/Check → → → → Auto Calibration/Check lets the operator select whether the analyzer actually calibrates, or performs a check of the calibration. To access the Auto Cal/Check menu, press from the Calibration Setup menu. The current setting is shown on the upper-right corner of the screen.

  • Page 65: Auto Calibration Timing

    700 CLD / O2 2-25-2021 Auto Calibration Timing → → → → Auto Calibration Timing determines the length of time it takes the analyzer to perform the Zero and Span cycles during a sequenced auto calibration. To access the AutoCal Timing screen, press from the Calibration Setup menu.
  • Page 66 700 CLD / O2 2-25-2021 1. Purge Before: the operator can set the amount of time necessary to flush the analyzer with calibration gases. This will ensure that there are no other gases remaining in the analyzer during the calibration process. 2.

  • Page 67: Deviation Limits

    700 CLD / O2 2-25-2021 Deviation Limits → → → → Deviation Limits are used by the operator to define the maximum acceptable error limits of the zero and span gases for both manual and sequenced calibration. To access the Deviation Limits menu, press from the Calibration Setup menu.

  • Page 68: Maximum Calibration Error

    700 CLD / O2 2-25-2021 Maximum Calibration Error → → → → → Maximum Calibration Error is used by the operator to define the maximum acceptable tolerances for Absolute and Relative deviations. Each range has its own set of Absolute and Relative tolerances. The deviations must be inside these tolerances for the analyzer to accept a calibration.

  • Page 69: Maximum Verifying Error

    700 CLD / O2 2-25-2021 Maximum Verifying Error → → → → → Maximum Verifying Error is the allowable tolerance during the Verifying step of sequenced calibration. To access the Maximum Verifying Error screen, press from the Deviation Limits menu. To set the allowable tolerances for different ranges, use the up or down arrow to move the highlight to the field you intend to change.

  • Page 70: Analog Hold On Cal

    700 CLD / O2 2-25-2021 Analog Hold on Cal → → → → Analog Hold on Cal will hold the analog outputs to the last measured value during calibration. If Analog Hold on Cal is Off the analog outputs will be live. The existing setting (Off) is shown at the top right of the menu.

  • Page 71: Calibration Factors

    700 CLD / O2 2-25-2021 Calibration Factors → → → Calibration Factors allow the operator to track and view changes from the factory and previous calibrations. To access the Calibration Factors menu, press from the Calibration menu. Press to view the Manual Calibration Deviations menu. Press to view the Auto Calibration Deviations menu.

  • Page 72: Manual Deviations

    700 CLD / O2 2-25-2021 Manual Deviations → → → → The Manual Deviations menu allows the operator to view the Zero and Span Deviations from manual calibrations. Press from the Calibration Factors menu to access the Manual Deviations menu. Press to view Zero Gas deviations.

  • Page 73: Zero Gas Deviations

    700 CLD / O2 2-25-2021 Zero Gas Deviations → → → → → Press from the Manual Deviations menu to view the Zero Gas Deviations screen. Absolute Zero Gas Deviation is the zero gas content calculated by the factory polynomial related to the calibrated range limit. Relative Zero Gas Deviation is the current deviation minus the deviation of the previous calibration related to the calibrated range limit.

  • Page 74: Span Gas Deviations

    700 CLD / O2 2-25-2021 Span Gas Deviations → → → → → Press from the Manual Deviations menu to view the Span Gas Deviations screen. Absolute Span Gas Deviation is span gas bottle value minus span gas value calculated by the factory polynomial related to the calibrated range limit.

  • Page 75: Auto Cal Deviations

    700 CLD / O2 2-25-2021 Auto Cal Deviations → → → → The Auto Calibration Deviations menu gives the operator a choice of viewing either zero or span verifying deviations. The verifying deviations are taken during the verifying stage of sequenced and auto calibrations. Press from the Calibration Factors menu to access the Auto Cal Deviations menu.

  • Page 76: Verifying Zero Deviations

    700 CLD / O2 2-25-2021 Verifying Zero Deviations → → → → → Press from the Auto Cal Deviations menu to view the Verifying Zero Deviations screen. Measured Value is the averaged concentration during the Verifying Zero stage of sequenced and auto calibrations. Variance is the difference of the measured value and zero.

  • Page 77: Verifying Span Deviations

    700 CLD / O2 2-25-2021 Verifying Span Deviations → → → → → Press from the Auto Cal Deviations menu to view the Verifying Span Deviations screen. Measured Value is the averaged concentration during the Verifying Span stage of sequenced and auto calibrations. Variance is the difference of the measured value and span gas concentration.

  • Page 78: Offset/Gain Factors

    700 CLD / O2 2-25-2021 Offset/Gain Factors → → → → When used in conjunction with the Manual Calibration Deviations, an increasing or decreasing change in Offset or Gain will provide insight into changes in analyzer performance. Press from the Calibration Factors menu to access the Offset/Gain Factors screen.

  • Page 79: Reset Factory Settings

    700 CLD / O2 2-25-2021 Reset Factory Settings → → → The Reset Factory Settings menu gives the operator a choice of resetting the Offsets and Gains, or both Factory Linear Coefficients and Offsets and Gains for all calibrated ranges. Resetting factory settings will not affect any other operator-changed parameters.
  • Page 80 700 CLD / O2 2-25-2021 Reset Offsets and Gains → → → → Pressing from the Reset Factory Settings menu will prompt the operator to confirm resetting Offsets and Gains for all ranges. Pressing (Yes) from this screen resets the Offset and Gain factors to factory default settings (0 and 1 respectively) and brings you to this confirmation screen: •...
  • Page 81 700 CLD / O2 2-25-2021 Reset Linear Coefficients → → → → Pressing from the Reset Factory Settings menu will prompt the operator to confirm resetting the Linear Coefficients for all ranges. Pressing (Yes) from this screen resets all the Linear Coefficients, Offset and Gain Factors and NO Correction Factors to factory default settings and brings you to this confirmation screen: NOTE: After resetting Linear Coefficients, the analyzer must be zeroed and spanned...

  • Page 82: Range Setup

    700 CLD / O2 2-25-2021 Range Setup → → Range Setup allows the operator to change Range Limits, turn Auto Range On or Off, and change Auto Range Switch Points. From the Menus screen press access the Range Setup menu. Press to view or change Range Limits.

  • Page 83: Range Limits

    700 CLD / O2 2-25-2021 Range Limits → → → → The analyzer is factory-configured with four physical ranges (1 - 4). The operator can change the number of ranges and select a specific full-scale concentration in ppm. From the Range Setup menu press to access the Range Limits screen.
  • Page 84 700 CLD / O2 2-25-2021 4. To set two ranges, set Range 1 to the lowest value, Range 2 to the highest value, and the others to zero. 5. If new ranges are saved, the Auto Range Switch Points will be set to default percentages of range limits.

  • Page 85: Auto Range On/Off

    700 CLD / O2 2-25-2021 Auto Range On/Off → → → → The Auto Range Function allows the analyzer to automatically switch up and down between ranges at predetermined concentrations. From the Range Setup menu press to access the Auto Range On/Off screen. The current Auto Range status appears in the upper-right corner of the screen.

  • Page 86: Autorange Switch Points

    700 CLD / O2 2-25-2021 AutoRange Switch Points → → → Auto Range Switch Points determine when the analyzer automatically changes a range up or down when the Auto Range function is turned on. From the Range Setup menu press to access the Auto Range Switch Points screen.

  • Page 87: Diagnostics

    700 CLD / O2 2-25-2021 Diagnostics → → The Diagnostics menu allows the operator to access key troubleshooting screens including Diagnostic Values, Raw Values and Input/Output statuses. From the Menus screen press to access the Diagnostics menu. Press to access the Diagnostic Values screen. It allows you to check analyzer temperatures, pressures, EPC voltage percentages and flows.

  • Page 88: Diagnostic Values

    700 CLD / O2 2-25-2021 Diagnostic Values → → → → Temperatures Screen The Diagnostic Values screens allow the operator to check analyzer temperatures, sample and air pressures, EPC voltage percentages and flows. These important screens are accessed by pressing from the Diagnostics menu.
  • Page 89 700 CLD / O2 2-25-2021 Pressures Screen The Pressures screen displays current sample and air pressures and low and high alarm limits in PSIG. EPC Voltage Percent Screen The EPC screen displays the percentage of EPC voltage being supplied to the EPC valve. Flows Screen The Flows screen displays the current flow of sample and air in mL/minute.

  • Page 90: Raw Values Display

    700 CLD / O2 2-25-2021 Raw Values Display → → → → The Raw Values Display screen is a diagnostic tool for viewing detector Raw Volts and Calculated Concentrations. This screen is accessed by pressing from the Diagnostics menu. Raw Voltage: This is a 0.512 VDC to 4.512 VDC that will be digitized by the microprocessor to generate the calibration curve from which the Raw Concentration and Measured Concentration are derived.
  • Page 91 700 CLD / O2 2-25-2021 From the Raw Values Display screen, the following functions can be useful for diagnosing and monitoring the analyzer’s performance: Press to change the analyzer’s mode to NO or NO . If the analyzer is in NO/NO mode it will continue to switch between NO and NO .

  • Page 92: I/O Status

    700 CLD / O2 2-25-2021 I/O Status → → → The I/O Status menu gives the operator a choice of viewing the statuses of the analyzer’s digital outputs or digital inputs (open or closed). To access the I/O Status menu, press from the Diagnostics menu.

  • Page 93: Analyzer Digital Outputs

    700 CLD / O2 2-25-2021 Analyzer Digital Outputs → → → → The Analyzer Digital Outputs screen allows the operator to view the status of an analyzer output (Open or Closed) and where to find the corresponding pin number. To access the Analyzer Digital Outputs status screen, press from the I/O Status menu.

  • Page 94: Analyzer Digital Inputs

    12 is the Pin Number on that connector. The abbreviations are as follows: M = Main Connector A = Auxiliary Int = internal, for CAI use only. When the analyzer is in Remote Mode and the digital input is pulled to digital ground (Main Connector, Pin 6), the status will become Closed.

  • Page 95: Programmable Digital Outputs

    700 CLD / O2 2-25-2021 Programmable Digital Outputs → → → → The Programmable Digital Outputs screen allows the operator to check the status of the analyzer’s programmable digital outputs (Open or Closed) according to pin numbers and programmed functions. From the I/O Status menu, press to view Programmable Digital Output statuses.

  • Page 96: Status Line

    700 CLD / O2 2-25-2021 Status Line → → → The AK Command Status Line can be displayed at the top of the Measure Screen. This field contains the current AK Protocol information. See Protocol. The current status is shown in the upper-right corner of the Status Line menu. Example above: OFF. From the Diagnostics menu, Press to select On or Off.

  • Page 97: Setup Menu

    Programmable Digital outputs can be viewed or set up to fit the operator’s needs. Press to view or change the current TCP/IP parameters. Press to access the Data Logging Time screen. (For CAI use only.) Press to view or make changes to the Auto Start Settings. Press...

  • Page 98: Measure Settings

    700 CLD / O2 2-25-2021 Measure Settings → → → The Measure Settings menu provides access to the following Setup parameters: Averaging Time, NO/NO Mode Times and NO Correction Factors. The Measure Settings menu is accessed by pressing from the Setup menu. Press to view or change the Averaging Time of the measured concentration.

  • Page 99: Averaging Time

    700 CLD / O2 2-25-2021 Averaging Time → → → → The Averaging Time screen allows the operator to set the averaging time of the measured concentration. From Measure Settings menu press to access the Averaging Time screen. The Averaging Time is a sliding average. As shown above, it can be set from 0 – 60 seconds.

  • Page 100: No X /No 2 Mode Times

    700 CLD / O2 2-25-2021 NO/NO Mode Times → → → → The NO/NO Mode Times screen allows the operator to set the Purge Time and the Integration Time. From Measure Settings menu press to access the NO/NO Mode Times screen. The Purge and Integration times are set to allow adequate purging and integration times between the NO and NO cycles.

  • Page 101: Nox Correction Factors

    700 CLD / O2 2-25-2021 NOx Correction Factors → → → → → Current Settings Correction Factors allows the operator to adjust small offsets between the NO and NOx modes while operating in the NO/NO mode. Press to access the Correction Factors menu from the Measure Settings menu.
  • Page 102 700 CLD / O2 2-25-2021 Press to set the analyzer in NO mode and enter the Manual Zero Calibration screen. Introduce zero gas into the rear of the analyzer. Once the concentration stabilizes, press to set the Zero Offset. Press to return to the NO Correction Factors menu.

  • Page 103: Output Settings

    700 CLD / O2 2-25-2021 Output Settings → → → The Output Settings menu allows the operator to change the analyzer’s Programmable Analog and Programmable Digital outputs to suit the operator’s needs. The Output Settings menu is accessed by pressing from the Setup menu.

  • Page 104: Programmable Analogs

    700 CLD / O2 2-25-2021 Programmable Analogs → → → → The Programmable Analogs menu provides access to the following Setup parameters: Output Assignments, Output Scaling and Output Adjustments. The Programmable Analogs menu is accessed by pressing from the Output Settings menu.

  • Page 105: Output Assignments

    700 CLD / O2 2-25-2021 Output Assignments → → → → → The Output Assignments screen allows the operator to view or change the signals assigned to the programmable analog outputs. From the Programmable Analogs menu press to access the Output Assignments screen. Use the Up/Down arrows to highlight the field you intend to change.
  • Page 106 700 CLD / O2 2-25-2021 The following output signals can be programmed by the operator from the Output Assignments screen: RealTime: In either NO or NO mode the concentration’s output will be a live reading. NO: In NO mode the concentration’s output will be a live reading. In NO/NO mode the output will be a read and hold.

  • Page 107: Output Scaling

    700 CLD / O2 2-25-2021 Output Scaling → → → → → The Output Scaling screen allows the operator to scale the analyzer’s Analog Outputs to a specific value for each of the four output signals. This is generally used for scaling of temperatures or pressures, but it can also be used to set an output for a specific concentration.
  • Page 108 700 CLD / O2 2-25-2021 EXAMPLES: 1. When the analog Output Assignment is set for Cell Temperature and the lower setting is set to 0.00 and the upper setting is set to 100.00, 66°C will = 6.6 VDC. 2. When the analog Output Assignments are set for concentrations and the default upper and lower settings are 0.00 and 0.00, the default settings allow the output...

  • Page 109: Output Adjustments

    700 CLD / O2 2-25-2021 Output Adjustments → → → → → The Output Adjustments screen allows the operator to set the output to either mA or voltage and calibrate the outputs to exactly match the results obtained on a PLC or other remote data-recording device.
  • Page 110 700 CLD / O2 2-25-2021 Once the output type has been selected, use the Left/Right arrows to move the highlight into the % FS column of the output to be checked. Press until the % FS value reads 0.000. To adjust the zero (Offset), use the Left/Right arrows highlight the Offset column and press to open the field.

  • Page 111: Programmable Digitals

    700 CLD / O2 2-25-2021 Programmable Digitals → → → → The Programmable Digitals menu provides access to the analyzer’s digital outputs for viewing and changing Output Assignments, holding or clearing alarms, and testing the outputs. The Programmable Digitals menu is accessed by pressing from the Output Settings menu.

  • Page 112: Output Assignments

    700 CLD / O2 2-25-2021 Output Assignments → → → → → The Output Assignments screen allows the operator to assign any of the 15 programmable digital outputs to a specific alarm or status. From the Programmable Digitals menu press to access the Output Assignments screen.
  • Page 113 700 CLD / O2 2-25-2021 Programmable Digital Output List Alarms_________________________________________________________________ • SampP – Sample Pressure • AUnd – ADC Under Range • AirP – Air Pressure • R1NC – Range 1 not calibrated • OvenT – Oven Temperature • R2NC – Range 2 not calibrated •...
  • Page 114 700 CLD / O2 2-25-2021 General Alarms__________________________________________________________ • Sample Pressure • Dryer Temperature • Air Pressure • O2 Temperature • Oven Temperature • Sample EPC Voltage • Converter Temperature • Air EPC Coil Voltage • Pump Temperature • ADC Over Range •...

  • Page 115: Output Hold/Clear

    700 CLD / O2 2-25-2021 Output Hold/Clear → → → → → The Output Hold/Clear menu allows the operator to choose whether to hold or clear a triggered alarm when the alarm is no longer present. The current status is shown in the upper-right corner of the Output Hold/Clear menu.

  • Page 116: Output Test

    700 CLD / O2 2-25-2021 Output Test → → → → → The Output Test Screen allows the operator to test the Programmable Digital Outputs to make sure they are functioning properly. The Output Test Screen is accessed by pressing from the Programmable Digitals menu.
  • Page 117 700 CLD / O2 2-25-2021 To test outputs one at a time, use the Up/Down arrows to highlight the desired output, then press to change the state of the output (open or closed). Press again to change the state back. To test all the outputs at once, press to change the state of all the outputs (they are all Open in the example).

  • Page 118: Tcp/Ip Parameters

    The IP-address, Netmask and Gateway may be defined by the user. The Port and WinIfPort are assigned 7750 and 2000 by CAI and should not be changed unless required for a certain location. Use the Up/Down arrows to move the highlight to the setting you wish to change.

  • Page 119: Data Logging Time

    Data logging allows the analyzer to store internal variables to support CAI troubleshooting. When troubleshooting with CAI Technical Support, the operator may be asked to turn this feature on. These files can only be accessed by CAI. To access the Data Logging screen press from the Setup menu.

  • Page 120: Auto Start Settings

    700 CLD / O2 2-25-2021 Auto Start Settings → → → The Auto Start Settings screen allows the operator to set parameters that will take effect upon power up of the analyzer. The Auto Start Settings screen is accessed by pressing from the Setup menu.
  • Page 121 700 CLD / O2 2-25-2021 To change a setting use the Up/Down arrows to move the highlight to the setting you wish to change. Press to open the field to change the value. After making your change, press again to close the field. Press to save your changes and return to the Setup menu.

  • Page 122: Clock Settings

    700 CLD / O2 2-25-2021 Clock Settings → → → The Clock Settings screen allows the operator to set the analyzer’s internal clock. The internal clock is used for auto calibrations and data time stamping. The Clock Settings screen is accessed by pressing from the Setup menu.

  • Page 123: Alarms Menu

    700 CLD / O2 2-25-2021 Alarms Menu → → The Alarms menu allows the operator to view Current Alarms, the Alarm Log and settable Alarm Limits. From the Menus screen press to access the Alarms menu. Press to access the Current Alarms screen and view the alarms that are currently active. Press to access the Alarm Log.

  • Page 124: Current Alarms

    700 CLD / O2 2-25-2021 Current Alarms → → → The Current Alarms screen allows the operator to view the analyzer’s current alarms at the time this screen was accessed. To access the Current Alarms screen press from the Alarms menu. Press to refresh this screen.

  • Page 125: Alarm Log

    700 CLD / O2 2-25-2021 Alarm Log → → → Screen Name Alarm Abbreviation Alarm Status Year / Month / Day Hour / Minute Alarm Value The Alarm Log allows the operator to view the analyzer’s last 40 alarms and their current statuses.
  • Page 126 700 CLD / O2 2-25-2021 Alarm Abbreviations and Descriptions SampP – Sample Pressure AOvr – ADC Over Range AirP – Air Pressure AUnd – ADC Under Range OvenT – Oven Temperature R1NC – Range 1 not calibrated ConvT – O Converter Temperature R2NC –...

  • Page 127: Alarm Limits

    700 CLD / O2 2-25-2021 Alarm Limits → → → The Alarm Limits menu allows the operator to view or change the current upper and lower alarm tolerances. When the signals go above or lower than the assigned limit an alarm is triggered.

  • Page 128: Temperatures

    700 CLD / O2 2-25-2021 Temperatures → → → → From the Alarm Limits menu press to access the Temperatures screen. Use the left or right arrow to highlight the alarm limit you wish to change. Press to open the field to change the value.

  • Page 129: Pressures

    700 CLD / O2 2-25-2021 Pressures → → → → From the Alarm Limits menu press to access the Pressures screen. Use the left or right arrow to highlight the alarm limit you intend to change. Press to open the field to change the value.

  • Page 130: Epc Voltages

    700 CLD / O2 2-25-2021 EPC Voltages → → → → From the Alarm Limits menu, press to access the EPC Voltage Alarm Limits screen. Use the left or right arrow to highlight the alarm limit you intend to change. Press open the field to change the value.

  • Page 131: Concentrations

    700 CLD / O2 2-25-2021 Concentrations → → → → Concentration alarms can be set to trigger an alarm below or above a specified concentration. From the Alarm Limits menu, press to access the Concentration Alarm Limits screen. Use the left or right arrow to highlight the concentration alarm limit you intend to change.

  • Page 132: Alarm Display On/Off

    The scrolling alarms will be replaced with the CAI phone number when an alarm is active. If there are no alarms, only the date and time will be displayed.

  • Page 133: Service Menu

    2-25-2021 Service Menu → → The Service Menu is for advanced operators and CAI Service. The Service menu provides access to operator-level linear coefficients and CAI factory service. From the Menus screen press to access the Service menu. Press to view or change operator-level linear coefficients.

  • Page 134: Linear Coefficients

    700 CLD / O2 2-25-2021 Linear Coefficients → → → The Linear Coefficients function allows the operator to optimize linearity by inputting up to five coefficients for each range to generate up to a fourth-order curve. From the Service menu press to access the Linear Coefficients screen.
  • Page 135 700 CLD / O2 2-25-2021 Use the Up/Down arrows to highlight the coefficient you intend to change. Press to open the field, use the left and right arrow buttons to position the cursor, and use the Up/Down arrows or number keys to make your change. Press again to close the field.

  • Page 136: Service Menu

    700 CLD / O2 2-25-2021 Service Menu → → → The Factory Service menus can only be accessed by California Analytical Instruments. The best way to contact CAI with a support question is to fill out our brief Technical Support Form at http://www.gasanalyzers.com/technical_support/new.

  • Page 137: Security

    700 CLD / O2 2-25-2021 Security → → The Security menu allows the operator to change the access to Standard or Setup Function menus and change or reset the Setup Function password. From the Menus screen press to access the Security menu. Press to set the operator’s access level.

  • Page 138: Operator Levels

    2-25-2021 Operator Levels → → → The 750 CLD has three operator access levels which allow the operator to access different analyzer functions. From the Security Menu screen press to access the Operator Levels screen. See Menu Flow Chart for security levels and functions.

  • Page 139: Change Password

    700 CLD / O2 2-25-2021 Change Password → → → The Change Password screen allows the operator to change the Setup Functions password from the factory-preset 222 to a new password. From the Security menu screen press access the Operator Levels screen. To change the password, press to open the field.

  • Page 140: Reset Password

    700 CLD / O2 2-25-2021 Reset Password → → → The Reset Password screen allows the operator to reset the Setup Password to the original factory password (222). From the Security menu screen press to access the Reset Password screen. To return the password to the original factory password, you must enter WIZARD in the field.

  • Page 141: Communication And Interface

    700 CLD / O2 2-25-2021 Communication and Interface Analog and Digital Interface The Main and Auxiliary connectors provide the analog outputs for concentrations and other variable signals. Digital Status outputs, Control inputs and Calibration drive signals are also provided. There are four analog outputs, whose type (mA or specific voltage range) and signal assignments are assignable from the Setup menu.

  • Page 142: Analog And Digital Interface

    700 CLD / O2 2-25-2021 Analog and Digital Interface Hardware Capabilities of Main and Aux Connectors Analog Output The operator can choose one of the following output types: • As voltage outputs – 0 to 1V, 5V or 10V • As current outputs – 0 to 20 mA or 4 to 20 mA When set as current outputs, the maximum drive voltage provided by the analyzer is slightly more than 20 Volts, requiring that the maximum loop resistance less than 1K Ohms.
  • Page 143 700 CLD / O2 2-25-2021 All opto-isolated relays are rated for 48VDC, 0.5 Amp maximum. The user is required to limit the drive current supplied to each input. All inputs are DC only and will not operate on AC current. CAUTION: Do not connect these pins directly to both sides of a voltage power supply as unrestricted current will damage the relay.
  • Page 144 700 CLD / O2 2-25-2021 28-Pin Main (BPM) Connector Assignments Pin # Signal Signal Type Operation Isolated Analog Ground Analog Output Isolated Analog Ground User-Defined AO-1 Analog Output 1V, 5V, 10VDC or mA User-Defined AO-2 Analog Output 1V, 5V, 10VDC or mA User-Defined AO-3 Analog Output 1V, 5V, 10VDC or mA...
  • Page 145 700 CLD / O2 2-25-2021 28-Pin Auxiliary (BPA) Connector Assignments Pin # Signal Signal Type Operation Analog Ground Analog Input Analog Ground Reserved Analog Input Reserved Reserved Analog Input Reserved Reserved Analog Input Reserved Relay RTN 1 Digital Output RTN Relays 1 - 4 Relay RTN 2 Digital Output RTN Relays 5 - 8...

  • Page 146: Serial Interface

    700 CLD / O2 2-25-2021 Serial Interface The serial interface enables remote control of the analyzer by a master computer. It is implemented as an RS232 V24 interface and meets all requirements of the AK protocol. A 9-pin male connector at the back of the unit is used to connect a master computer with the following pin assignment: Pin 3 = Txd (transmit) Pin 2 = Rxd (receive)

  • Page 147: Ak Protocol

    Every command ends with the ETX (End of Text) character. The Error Status byte does not indicate the real number of errors. For Error Status, use the ASTF command. ® Example: Using Windows HyperTerminal for Serial RS232 Communications with CAI 750 Series Analyzers requires: 1. HyperTerminal software 2. Windows PC/laptop 3.
  • Page 148 700 CLD / O2 2-25-2021 When both HyperTerminal and the analyzer are running while connected by the null modem cable, the analyzer will present a menu if sent a non-AK command. This menu can be ignored and AK commands will be acted on by the analyzer. The picture below shows a sequence with the AKON 0 command being sent to the analyzer.

  • Page 149: Instruction Command

    700 CLD / O2 2-25-2021 Instruction Command Byte Character Explanation Byte ASCII Code 02 Byte Don’t Care Any ASCII code Byte Function Code 1 AK instruction, e.g. ASTF Byte Function Code 2 AK instruction, e.g. ASTF Byte Function Code 3 AK instruction, e.g.

  • Page 150: Acknowledgement Command

    700 CLD / O2 2-25-2021 Acknowledgement Command Byte Character Explanation Byte ASCII Code 02 Byte Don’t Care Any ASCII code Byte Function Code 1 Echo of the AK instruction command Byte Function Code 2 Echo of the AK instruction command Byte Function Code 3 Echo of the AK instruction command...

  • Page 151: Error Handling

    700 CLD / O2 2-25-2021 Error Handling It is possible that an unknown instruction is sent, the analyzer is busy with a function that is not the desired one, or an error occurred in the command parameters. The table below provides a summary of all errors that can appear upon any master instruction.

  • Page 152: General Ak Requirements

    700 CLD / O2 2-25-2021 General AK Requirements 1. If the command message contains no error, the Acknowledge message contains the echo of the Function code and the Error Status number (0 to 9). 2. If the transfer was faulty or the function code is unknown, the answer contains four question marks (for example, ???? 0).
  • Page 153 700 CLD / O2 2-25-2021 Abbreviations Abbreviation Description Measuring range number Mn .. M4 Measuring range 1 .. 4 w.w .. ZZ. Numerical value Number Numeric integer value a0 .. a4 Polynomial coefficients Status Yyymmdd Date of format year, month and day with 2 characters each and no spaces Hhmmss Time of format hour, minute and second with 2 characters each and no spaces In general, AK commands are subdivided into three classes:...

  • Page 154: Scan Commands

    750 Manual 2-25-2021 Scan Commands AAEG: Verifying Span-Point Deviation During Auto Calibration Command Response Description _AAEG_K0 _AAEG_s_M1_z.z_da_dr Verifying deviations of ranges M1 to M4 and _M2_z.z_da_dr with O option from span point stored _M3_z.z_da_dr after auto calibration. _M4_z.z_da_dr Values: measured value (z.z), absolute dev _02_z.z_da.dr...
  • Page 155 750 Manual 2-25-2021 AATK: Query Auto Calibration Parameters Command Response Description _AATK_K0 _AATK_s_z_y_x z: 1) NO mode 2) NO mode y: 1) ALL gases 2) Zero gas only x: 1) NO only 2) NO 3) O only ADAL: Diagnostic Alarm Limits...
  • Page 156 750 Manual 2-25-2021 ADRU: Pressures / Electronic Pressure Control Valve Voltage in Percent Command Response Description _ADRU_K0 _ADRU_s_z.z_y.y_x.x…… 1. Sample pressure 2. Air pressure 3. % of sample EPC volts 4. % of Ozone EPC Volts _ADRU_K0_x _ADRU_s_xpress/x% voltage Reading of x...
  • Page 157 750 Manual 2-25-2021 AFDA: Auto Calibration Times and Purge Time Command Response Description _AFDA_K0_SATK _AFDA_s_z_y_x_w Auto calibration times in seconds: z: Purge time y: Verify time x: Purge after time w: Calibrate time v: Total time _AFDA_K0_SSPL _AFDA_s_z Purge time will be responded...
  • Page 158 750 Manual 2-25-2021 AKAK: Calibration Gas Concentrations Command Response Description _AKAK_K0 _AKAK_s_M1_w.w All existing calibration gas values are responded _M2_x.x _M3_y.y _M4_z.z _AKAK_K0_Mn _AKAK_s_Mn_z.z Calibration gas value of Range n _AKAK_K1 _AKAK_s_M1_w.w K1 is for O option AKAL: Percent Deviations of Last Accepted Calibration...

  • Page 159: Akon: Measured Concentration Value

    750 Manual 2-25-2021 AKON: Measured Concentration Value Command Response Description _AKON_K0 _AKON_s_z.z_y.y_x.x_t z.z : Current measured value y.y : NO concentration x.x : NO concentration w.w : NO concentration Note: y.y, x.x, and w.w are normally 0.0 when NO/NO mode is selected.
  • Page 160 750 Manual 2-25-2021 APAR: Auto Calibration Tolerance Values Command Response Description _APAR_K0_SATK _APAR_s_z.z_y.y_x.x_w.w Auto calibration tolerance value (%): z.z: Range 1 y.y: Range 2 x.x: Range 3 w.w: Range 4 ARAW: Raw Detector Volts Command Response Description _ARAW_K0 _ARAW_s_z.z_t Raw detector volts t = Timestamp (1/10 sec.)

  • Page 161: Astf: Error Status

    750 Manual 2-25-2021 ASTF: Error Status Command Response Description _ASTF_K0 _ASTF_s_f1_f2_f3_...f25 Current error numbers of all are responded. 1. Check sample pressure 2. Check air pressure 3. Check oven temperature 4. Check converter temperature 5. Check pump temperature 6. Check diode temperature 7.
  • Page 162 750 Manual 2-25-2021 ASTZ: Normal Device Status Command Response Description _ASTZ_K0 _ASTZ_s _State 1_State 2_. . State 5 Respond device status for all channels Possible States Response Description State 1 SREM Remote SMAN Manual State 2 STBY Standby SPAU Pause...
  • Page 163 750 Manual 2-25-2021 AT90: Respond Low-pass Filter Time Command Response Description _AT90_K0 _AT90_s_t Low-pass filter time in seconds t = filter time in seconds ATCP: Query TCP/IP Settings Command Response Description _ATCP_K0 _ATCP_s_zzz.zzz.zzz.zzz zzz: TCP/IP address _yyy.yyy.yyy.yyy yyy: TCP/IP subnet mask...
  • Page 164 750 Manual 2-25-2021 AVER: Query Software Version Command Response Description _AVER_K0 _AVER_s_NMAIN_Z_mm.dd.yyyy_ Z: NMAIN version build number NUSER_Y_mm.dd.yyyy_OSMSR_ Y: NUSER version build number X_dd.mm.yyyy X: OSMSR version build number dd: Day mm: Month yyyy: Year...

  • Page 165: Control Commands

    750 Manual 2-25-2021 Control Commands SARA: Auto Range Off Command Response Description _SARA_K0 _SARA_s Sets auto range off, CLD and FID SARE: Auto Range On Command Response Description _SARE_K0 _SARE_s Sets auto range on SATK: Start Automatic Calibration Command Response...
  • Page 166 750 Manual 2-25-2021 SEMB: Set Measuring Range Command Response Description _SEMB_K0_Mn _SEMB_s Sets measuring range to range n. Auto range will be disabled. SENO: Sets NO Mode Command Response Description _SENO_K0 _SENO_s Sets the measurement mode to NO only SENT: Set Calibration Gas Flow (Pumps or Valves)
  • Page 167 750 Manual 2-25-2021 SNKA: Saves Measured Value as New Offset Command Response Description _SNKA_K0 _SNKA_s Saves measured value of actual range as offset if Zero mode is set _ SNKA_K1 _SNKA_s Saves measured value as offset of O channel if...
  • Page 168 750 Manual 2-25-2021 SSPL: Purge Analyzer with Zero Gas Command Response Description _SSPL_K0 _SSPL_s Opens purge gas valve STBY: Standby Command Response Description _STBY_K0 _STBY_s Standby mode SUDP: Start/Stop UDP Data Streaming Command Response Description _SUDP_K0_ON _SUDP_s Starts data streaming via the UDP channel.

  • Page 169: Configuration Commands

    750 Manual 2-25-2021 Configuration Commands EATK: Set Auto Calibration Parameters Command Response Description _EATK_K0_z_y_x _EATK_s_z_y_x z: 1) NO mode 2) NO mode y: 1) ALL gases 2) Zero gas only x: 1) NO only 2) NO 3) O only EDAL: Set Diagnostic Alarm Limits...
  • Page 170 750 Manual 2-25-2021 EEFF: NO Offset and Correction Factor Command Response Description _EEFF_K0 _EEFF_s_z.z_y.y zz: NO offset yy: NO correction factor EFDA: Set Auto Calibration and Purge Times Command Response Description _EFDA_K0_SATK_ _EFDA_s Sets auto calibration times: z_y_x z: Purge time...
  • Page 171 750 Manual 2-25-2021 EKAK: Set the Four Span Gas Concentration Values Command Response Description _EKAK_K0_M1_ _EKAK_s Sets the NO span gas values w.w_M2_x.x_M3_ y.y_M4_z.z EKAK_K1_M1_ _EKAK_s Sets the O span gas values EMBE: Set the Four Measuring Range Full scale Limits...
  • Page 172 750 Manual 2-25-2021 ESYZ: Set System Time Command Response Description _ESYZ_K0_ _ESYZ_s Sets system time: yymmdd_hhmmss yymmdd: year, month, day (each 2 characters wide, no spaces) hhmmss: hour, minutes, seconds (each 2 characters, no spaces) ET90: Set Lowpass Filter Time...
  • Page 173 750 Manual 2-25-2021 EUDP: Set TCP/IP Data Streaming Parameters Command Response Description _EUDP_K0_<UDPPort>_ _EUDP_s Configures a UDP channel for data <DataFrequency>_ streaming of the measuring values via [<Mode>]_[<UDP_IP>] Ethernet UDP. Port: port for opening the UDP connection Data Frequency: frequency for transmitting...
  • Page 174 750 Manual 2-25-2021 <data> is the AK four-character code followed by the answer. See corresponding AK command description. Example Sending “EUDP K0 7501 2 A – AKON_KO;ADUF_K0” will give the following streaming result: “123 AKON 4.07 901.33 22.50 3481639460 ADUF 4.30 4.59 4.45”, where 123 is the sequence...

  • Page 175: Modbus Protocol

    750 Manual 2-25-2021 Modbus Protocol Modbus on TCP/IP Application Data Unit MBAP Description This section describes the encapsulation of a Modbus request or a response when it is carried on a Modbus TCP/IP network. A dedicated header, called the MBAP (Modbus Application Protocol) header, is used on TCP/IP to identify the Modbus Application Data Unit.

  • Page 176: Mbap Header Description

    All Modbus/TCP ADU are sent via TCP to Registered Port 502. The different fields are encoded in Big-endian. The 750 CLD analyzer uses only the Length bytes from the MBAP section.

  • Page 177: Modbus Command Function Codes

    750 Manual 2-25-2021 Modbus Command Function Codes Code 01 This function code is used to read from 1 to 2000 contiguous status bits in a remote device. The requesting remote device specifies the starting address, including the address of the first bit specified and the number of bits.
  • Page 178 750 Manual 2-25-2021 Error Function Code 1 Byte Function code + 0x80 Exception Code 1 Byte 01 or 02 or 03 or 04 Here is an example of a request to read discrete outputs 20–38: Request Response Field Name (Hex)
  • Page 179 750 Manual 2-25-2021 Command 01, Read Coil 200 Count 1. Result = 01. Command 01, Read Coil 200 Count 16. Result = 55 55 hex.
  • Page 180 750 Manual 2-25-2021 Code 03 This command has been modified to read floating-point numbers in 32-bit IEEE format. This function code is used to read the contents of a contiguous block of floating-point registers in a remote device. The Request PDU specifies the starting register address and the number of registers.
  • Page 181 750 Manual 2-25-2021 Here is an example of a request to read Register 0: Request Response Field Name (Hex) Field Name (Hex) Function Function Starting Address Hi Byte Count Starting Address Lo Register Value Hi (1) Number of Registers Hi...
  • Page 182 750 Manual 2-25-2021 Here is an example of a request to read 3 registers starting at 40201: Request Response Field Name (Hex) Field Name (Hex) Function Function Starting Address Hi Byte Count Starting Address Lo Register Value Hi (40202) Number of Registers Hi...
  • Page 183 750 Manual 2-25-2021 Command 03, Read four Floating Point values starting at Address 1. Result = 1234.56789, 0.0 -1234.568, 10000.
  • Page 184 750 Manual 2-25-2021 Code 04 This function code is used to read from 1 to 125 contiguous input registers in a remote device. The Request PDU specifies the starting register address and the number of registers. In the PDU, registers are addressed starting at zero. Therefore input registers numbered 1-16 are addressed as 0-15.
  • Page 185 750 Manual 2-25-2021 Here is an example of a request to read Input Register 8: Request Response Field Name (Hex) Field Name (Hex) Function Function Starting Address Hi Byte Count Starting Address Lo Input Register 9 Hi Quantity of Input Registers Hi...
  • Page 186 750 Manual 2-25-2021 Code 05 This function code is used to write a single output to either ON or OFF in a remote device. The requested ON/OFF state is specified by a constant in the request data field. A value of FF 00 hex requests the output to be ON.
  • Page 187 750 Manual 2-25-2021 Here is an example of a request to write bit 173 ON: Request Response Field Name (Hex) Field Name (Hex) Function Function Output Address Hi Output Address Hi Output Address Lo Output Address Lo Output Value Hi...
  • Page 188 750 Manual 2-25-2021 Code 06 This function code is used to write a single holding register in a remote device. The Request PDU specifies the address of the register to be written. Registers are addressed starting at zero. Therefore the register numbered 1 is addressed as 0.
  • Page 189 750 Manual 2-25-2021 Here is an example of a request to write Register 1 to 00 03 hex: Request Response Field Name (Hex) Field Name (Hex) Function Function Register Address Hi Register Address Hi Register Address Lo Register Address Lo...
  • Page 190 750 Manual 2-25-2021 Code 16 This function code is used to write a single floating point register to a remote device. The requested written values are specified in the request data field. Data is packed as four bytes per register. The normal response returns the function code, starting address and quantity of registers written.
  • Page 191 750 Manual 2-25-2021 Here is an example of a request to write two registers starting at 2 to 00 0A and 01 02 hex: Request Response Field Name (Hex) Field Name (Hex) Function Function Starting Address Hi Starting Address Hi...
  • Page 192 750 Manual 2-25-2021 Command 16, Write one floating point register at Address 40200 showing error response. Not a valid address.
  • Page 193 750 Manual 2-25-2021 Code 26 This is a non-standard code used to read an ASCII string. Request Function Code 1 Byte 0x1A Starting Address 2 Bytes 0x0000 to 0xFFFF Quantity of Registers 2 Bytes Response Function Code 1 Byte 0x1A...

  • Page 194: Modbus Map

    750 Manual 2-25-2021 Modbus Map 01H Single-Read Coil Modbus Commands Use TCP/IP Port 502. (Do not change TCP/IP port from 7750.) Coil Numbers and Descriptions Coil Number Read Data Sample pressure Air pressure Oven temperature Converter temperature Pump temperature Diode temperature...
  • Page 195 750 Manual 2-25-2021 Coil Number Read Data 0 – Manual, 1 – Remote 0 – Standby, 1 – Measure 1 – Zero 1 – Span 1 – AutoCal 1 – Purge 0 – Standby, 1 – Measure 1 – Zero 1 –...

  • Page 196: 05H Write Single Coil

    750 Manual 2-25-2021 05H Write Single Coil Modbus Commands Use TCP/IP Port 502. (Do not change TCP/IP port from 7750.) Coil Numbers and Descriptions Coil Number Write Data 0 – Manual, 1 – Remote 0 – Standby, 1 – Measure 1 –...

  • Page 197: 03H Read Floating Point

    750 Manual 2-25-2021 03H Read Floating Point Modbus Commands Use TCP/IP Port 502. (Do not change TCP/IP port from 7750.) Register Numbers and Descriptions Register Number Contents IEEE 40001 UNDILUTED real-time concentration* dilution ratio / 10000 40003 Real-time concentration (in ppm)
  • Page 198 750 Manual 2-25-2021 Register Number Contents IEEE 40063 Range 1 gain 40065 Range 2 offset 40067 Range 2 gain 40069 Range 3 offset 40071 Range 3 gain 40073 Range 4 offset 40075 Range 4 gain 40077 offset 40079 gain 40109...
  • Page 199 750 Manual 2-25-2021 Register Number Contents IEEE 40239 Converter temperature alarm minimum 40241 Converter temperature alarm maximum 40243 Pump temperature alarm minimum 40245 Pump temperature alarm maximum 40247 Diode temperature alarm minimum 40249 Diode temperature alarm maximum 40251 Cell temperature alarm minimum...

  • Page 200: 16H Write Floating Point

    750 Manual 2-25-2021 16H Write Floating Point Modbus Commands Use TCP/IP Port 502. (Do not change TCP/IP port from 7750.) Register Numbers and Descriptions Register Number Contents IEEE 40201 Range 1 span gas concentration 40203 Range 2 span gas concentration...
  • Page 201 750 Manual 2-25-2021 Register Number Contents IEEE 40267 detector temperature alarm minimum 40269 detector temperature alarm maximum 40287 Sample concentration alarm minimum 40289 Sample concentration alarm maximum...

  • Page 202: Warranty Statement

    Buyer by CAI and if any such product should prove to be defective within such one year period, CAI agrees, at its option, either (i) to correct by repair or, at CAI’s election, by replacement with...
  • Page 203 750 Manual 2-25-2021 f) CAI may from time to time provide a special printed warranty with respect to a certain product, and where applicable, such warranty shall be deemed incorporated herein by reference; g) CAI shall be released from all obligations under all warranties, either expressed or implied, if any product covered hereby is repaired or modified by persons other than its own authorized service personnel unless such repair by others is made with the written consent of CAI.

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