Michell Instruments QMA401 User Manual
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Michell Instruments QMA401 User Manual

Trace moisture analyzer
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QMA401
Trace Moisture Analyzer
User's Manual
97450 Issue 2
March 2018

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  • Page 1 QMA401 Trace Moisture Analyzer User’s Manual 97450 Issue 2 March 2018...
  • Page 2 Please fi ll out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Analyzer Code Serial Number Invoice Date Location of Instrument Tag No Analyzer Code Serial Number Invoice Date...
  • Page 3 © 2018 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.

  • Page 4: Table Of Contents

    QMA401 User’s Manual Contents Safety ..........................viii Warnings ........................viii Electrical Safety ......................viii Pressure Safety ......................viii Hazardous Materials (WEEE, RoHS2 & REACH) ............. viii Calibration (Factory Validation) ..................ix Repair and Maintenance ....................ix Abbreviations ........................x INTRODUCTION ....................1 General ......................1 Theory of Operation ...................
  • Page 5 QMA401 User’s Manual MAINTENANCE ....................46 Removal and Replacement of the Power Supply Fuse .......... 47 Removal and Replacement of the Dryer Module ..........47 CALIBRATION ....................49 Traceability ...................... 49 APPLICATION SOFTWARE OVERVIEW ...............51 System Requirements ..................51 System Connection ................... 51 Getting Started ....................
  • Page 6 Measurement Cycle (Phase 2) Calibration Flow ...........43 Figure 40 Calibration Cycle (Phase 1) - Dried Sample Flow .........44 Figure 41 Calibration Cycle (Phase 2) - Sample Flow ..........45 Figure 42 Typical QMA401 Calibration Certificate ............50 97450 Issue 2, March 2018...
  • Page 7 QMA401 User’s Manual Appendices Appendix A Technical Specification ................62 Appendix B Calculating Conversion Factors for Gas Mixes ..........64 Appendix C Modbus Holding Register Map ..............66 Set Points and Ranges ..............83 Gases for Gas Correction Values ........... 84 Appendix D Quality, Recycling, Compliance &...

  • Page 8: Safety

    QMA401 User’s Manual Safety The instrument is designed to be completely safe when installed and operated correctly in accordance with the information provided in this manual. This manual contains all the required information to install, operate and maintain this product. Prior to installation and use of this product, this entire manual should be read and understood.

  • Page 9: Calibration (Factory Validation)

    Michell Instruments can provide a fully traceable factory calibration service for the instrument and it is recommended that this is considered at intervals of every year of the analyzer's life. Please contact your local Michell Instruments' office or representative for further details (www.michell.com).

  • Page 10: Abbreviations

    QMA401 User’s Manual Abbreviations The following abbreviations are used in this manual: ampere alternating current pressure unit (atmosphere) bara pressure unit (=100 kP or 0.987 atm) (absolute) barg pressure unit (=100 kP or 0.987 atm) gauge °C degrees Celsius °F...

  • Page 11: Introduction

    Minimal & Straightforward Maintenance Sophisticated instruments are often complicated and require experience and special care in use, increasing cost of ownership. The QMA401 differs through its very uncomplicated approach to field service; the desiccant column is easy to replace via the dryer service panel on the rear of the instrument.

  • Page 12: Theory Of Operation

    Sample Gas Path The QMA401 measurement system must be supplied with gas at the required pressure (to match that of its calibration) via the VCR connection on the rear of the instrument. The flow is controlled automatically.

  • Page 13: Internal Sampling Options

    QMA401 User’s Manual INTRODUCTION Internal Sampling Options The QMA401 is available with a Pressure regulator, or a fast loop bypass with flow control. Either of these options can be configured independently or together with either an internal or external particulate filter: •...
  • Page 14 QMA401 User’s Manual INTRODUCTION GAS IN GAS OUT FILTER DRYER OVEN S3 - Fast-loop bypass with flow control. With 15μm internal filtration. GAS IN GAS OUT DRYER OVEN S4 - Input pressure regulator. External 15μm filter supplied GAS IN GAS OUT...

  • Page 15: Figure 2 Internal Sampling Options

    QMA401 User’s Manual INTRODUCTION GAS IN GAS OUT DRYER OVEN S6 - Fast-loop bypass with flow control. External 15μm filter supplied Figure 2 Internal Sampling Options Michell Instruments...

  • Page 16: Installation

    QMA401 User’s Manual INSTALLATION INSTALLATION Analyzer Storage Instructions In order for this product to be functional upon installation it should be stored in accordance with the guidelines below: • The product must be housed in a sheltered area, out of direct sunlight and rain.

  • Page 17: Unpacking The Instrument

    24 V, 1A. NOTE: THIS RATING MUST NOT BE EXCEEDED Fuse This product is provided with an internally mounted fuse. A replacement fuse can be obtained by contacting Michell Instruments' technical support. Fuse rating = 5 x 20mm 3 A anti-surge to IEC 60127-2. Power Connection...

  • Page 18: Figure 4 Rear Panel Connections

    QMA401 User’s Manual INSTALLATION Rear Panel Connections POWER: 85-264V AC 47-63Hz 100VA T2.5 MODBUS MODBUS 485 ALARMS 1 - 2 ALARMS 3 - 4 EXTERNAL ANALOGUE PRESSURE OUTPUT SERIAL NUMBER Power Connection IEC Power Socket, On/Off Switch & Fuse RS485...

  • Page 19: Pressure Safety

    Figure 5 . All connections should be made with high quality stainless steel tubing. NOTE: No external gas couplings are supplied with the analyzer but can be ordered as an accessory by contacting Michell Instruments - see www. michell.com for contact details. Michell Instruments...

  • Page 20: Figure 5 Typical Gas Connections

    QMA401 User’s Manual INSTALLATION NOTE: Items 1 to 6 are not supplied with the unit, and only illustrated to show a typical gas coupling. Figure 5 Typical Gas Connections Making a connection to the 1/4" VCR fitting: Clip the gasket and its retaining ring (8) over the end of the VCR adaptor (5) .
  • Page 21 QMA401 User’s Manual INSTALLATION The couplings can be checked for leaks by pressurizing the system (by connecting the sample line to the process) and introducing a proprietary leak test solution into each of the test ports (6) located on the locking nut (7). If a stream of bubbles is produced then the gasket seal is leaking.

  • Page 22: Operation

    Section 2 and connected to a sample gas supply that is representative of the monitored process. General Operational Information Operation of the QMA401 Trace Moisture Analyzer is completely automated and once setup requires little operator intervention besides routine maintenance. First Time Operation When the instrument is switched on an Initializing overlay will be shown while the menu system loads.

  • Page 23: Regulating Sensor Pressure

    3.2.1 Regulating Sensor Pressure The sensor pressure of the QMA401 must match the pressure stated on the calibration certificate in order for the calibration to be valid. To control the sensor pressure, a pressure regulator is required on the input of the analyzer.

  • Page 24: Analyzer Setup

    QMA401 User’s Manual OPERATION 3.2.2 Analyzer Setup During the period when the oven is heating to set point, all functions except for HMI adjustments are disabled until the oven has reached its operating temperature. During this time, the carrier gas setting needs to be configured correctly for the gas being measured.

  • Page 25: Menu Structure

    QMA401 User’s Manual OPERATION Menu Structure LARGE DISPLAY PARAMETER 1 LARGE DISPLAY MAIN SCREEN PARAMETER 2 FULL SCREEN OVEN TEMP SENS GRAPH WARNINGS OVEN TEMP CNTL OUTPUT 1 ENCLOSURE TEMP LOGGING FLOW CONTROL OUTPUT 2 CELL PRESSURE OSCILLATOR COM ALARMS...

  • Page 26: Description Of Measured Parameters

    QMA401 User’s Manual OPERATION Description of Measured Parameters Moisture content ppm Parts per million of H O by volume Moisture content ppm Parts per million of H O by weight Moisture content mg/m Milligrams H O per cubic meter gas...

  • Page 27: Table 1 Main Screen Parameters

    Cal External external reference – The oven is still heating to the set-point temperature Heating Displays the countdown to the next mode. If the QMA401 is in warm Oven up mode this parameter is replaced with a live oven temperature Temperature/Next reading.

  • Page 28: Large Display Mode

    QMA401 User’s Manual OPERATION 3.5.1 Large Display Mode To access large display mode, press and hold on the measurement parameter to be enlarged. To return to the Main Screen, touch anywhere on the screen. Figure 11 Large Display Mode 3.5.2 Full Screen Graph Displays a full screen graph of Parameter 1.

  • Page 29: Main Screen Sub Menus

    QMA401 User’s Manual OPERATION Main Screen Sub Menus The following sub menus can be accessed from the Main Screen: • Warnings • Logging • Alarms • Field Cal • Settings • Monitor 3.6.1 Warning Screen The buttons on this screen are used to toggle the internal alarms on/off. When an individual alarm is disabled it will not trigger the internal alarm.

  • Page 30: Logging Screen

    QMA401 User’s Manual OPERATION 3.6.2 Logging Screen Controls logging to the SD card. Figure 14 Logging Screen Parameter Description Frequency of recording data to the log file Log Interval Available Options: Cycles, Seconds Interval Units Displays status information related to logging, e.g. SD card full...

  • Page 31: Alarm Screen

    QMA401 User’s Manual OPERATION 3.6.3 Alarm Screen Alarm Screen Figure 16 Parameter Description The left and right arrow keys are used to toggle through the different alarms available. Alarm Selector Available Options: Alarm 1, Alarm 2, Alarm 3, Alarm 4 - Analyzer Status Alarm only Clears a latched alarm.

  • Page 32: Field Calibration Screen

    QMA401 User’s Manual OPERATION 3.6.4 Field Calibration Screen Field Calibration Screen Figure 17 Parameter Description Starts a calibration procedure if a manual calibration has been selected. Calibrate Toggles data hold mode. This determines whether the last valid measurement is held while a calibration is carried out.
  • Page 33 Interval (Days) The hour in the day at which an automatic Hour calibration will start. Period of time for the QMA401 to stabilize to the new moisture level (as presented by the internal Settling Cycles moisture generator or external ppm value) before conducting the actual calibration cycles.

  • Page 34: Figure 18 Field Calibration Screen 2

    QMA401 User’s Manual OPERATION If Analog O/P Hold is turned off then the ‘Hold Cycles’ selection box is hidden, as shown below: Field Calibration Screen 2 Figure 18 Hold Cycles – If Analog O/P Hold is selected, the user can select for how many cycles after the calibration the last measured value is held for.

  • Page 35: Figure 20 Field Calibration Screen 4

    QMA401 User’s Manual OPERATION If a manual calibration is selected then both the ‘Interval’ and ‘Hour’ selection boxes are hidden, as shown above. If an automatic calibration is selected then the “Calibrate”, “Cal Source” and “Ext Ref” selection boxes are hidden, as shown below:...

  • Page 36: Monitor Screen

    QMA401 User’s Manual OPERATION 3.6.5 Monitor Screen Figure 22 Monitor Screen Parameter Description Live moisture reading in ppm Moisture Content (ppm Live beat frequency reading: the frequency difference Beat Frequency between the two crystals. Live delta frequency reading: the frequency difference Delta Frequency between the sample and reference phase.

  • Page 37: Settings Menu

    QMA401 User’s Manual OPERATION Settings Menu Figure 23 Settings Menu Screen Allows access to the following sub menus to change instrument settings. • Measurement • Outputs • • • SW Comms • Cal History • About Michell Instruments...

  • Page 38: Measurement Screen

    QMA401 User’s Manual OPERATION 3.7.1 Measurement Screen Measurement Screen Figure 24 Parameter Description Toggles through the different carrier gas options. Available Options: Air, Ar, CH , C2H CO, CO , He, Kr, N , Ne, NH , NO, N O, O...

  • Page 39: Figure 25 Carrier Gas Screen

    QMA401 User’s Manual OPERATION 3.7.1.1 Carrier Gas Used to select a different carrier gas. When the user presses this box the page below is opened. Figure 25 Carrier Gas Screen There are 20 different preset gases the user can choose from, along with 3 user definable presets;...

  • Page 40: Figure 26 Measurement Screen

    QMA401 User’s Manual OPERATION NB. If User1, 2 or 3 is selected as the carrier gas then a new parameter box will appear underneath the carrier gas toggle box called ‘User Gas Entry’. This can be seen below. Figure 26...

  • Page 41: Pressure Input

    QMA401 User’s Manual OPERATION 3.7.2 Pressure Input Selects the pressure source. Options are: • Atmos. • Fixed • External If the external option is selected the ‘Fixed’ selection box is hidden and replaced with the ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes as shown below:...

  • Page 42: Figure 28 Fixed Options

    QMA401 User’s Manual OPERATION If the fixed option is selected the ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes are hidden and replaced with the ‘Fixed’ selection box as shown below: Figure 28 Fixed Options If the ‘Atmos.’ option is selected the ‘Fixed’, ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes are all hidden as shown below: Atmos.
  • Page 43 QMA401 User’s Manual OPERATION • Gas – Allows the user to enter a unique name for the gas using the onscreen keypad. • Molecular Weight – Allows the user to enter the molecular weight of the gas using the onscreen keypad.

  • Page 44: Outputs Screen

    QMA401 User’s Manual OPERATION 3.7.3 Outputs Screen Figure 31 Outputs Screen Parameter Description Selects output required. Output Selector Available Options: Output 1, Output 2 Toggles through the different output parameters. Parameter Available Options: Oven ˚C, ml/min, Cell Pr. barg, External Pr. barg,...

  • Page 45: Hmi Screen

    QMA401 User’s Manual OPERATION 3.7.4 HMI Screen HMI Screen Figure 32 Parameter Description Toggles through the different languages available. Language Selects the time scale of the chart. Chart Period Available Options: 5 mins, 30 mins, 1 hr, 5 hrs, 10 hrs, 24 hrs Sets the screen brightness level in %.

  • Page 46: Real Time Clock Screen

    QMA401 User’s Manual OPERATION 3.7.5 Real Time Clock Screen Real Time Clock Screen Figure 33 Parameter Description Sets the current date for the real time clock. Day / Month / Year Sets the current time for the real time clock.

  • Page 47: Software Communications Screen

    QMA401 User’s Manual OPERATION 3.7.6 Software Communications Screen Figure 34 Software Communications Screen Parameter Description Sets the instrument address using the keypad. Instrument ID Toggles different physical layer types. Protocol Available Options: RS485 / USB / TCP/IP This open the Ethernet page, where the user can configure the Address network settings.

  • Page 48: Field Calibration History

    V1.01 Oscillator Firmware V1.00 Display Firmware V1.25 Analyzer Serial Number 12345 Oven Serial Number 12346 Michell Instruments QMA401 Trace Moisture Analyzer SERVICE www.michell.com About Screen Figure 37 Displays the instrument firmware versions and serial numbers. 97450 Issue 2, March 2018...

  • Page 49: Sampling Guidelines

    OPERATION Sampling Guidelines The QMA401 Trace Moisture Analyzer is designed to operate in a flowing gas stream and is suitable for the measurement of the moisture content of a wide variety of gases. In general, if the gas (in conjunction with water vapor) is not corrosive to the sampling system and the sensor base metals then it will be suitable for measurement by the QMA401.
  • Page 50 Michell Instruments supplies a range of precision pressure fittings suitable for use with the QMA401 instrument. Contact Michell Instruments for details of the items available.
  • Page 51 • Ambient temperature variation The QMA401 is extremely sensitive to moisture fluctuations and ambient temperature variations will affect the equilibrium conditions. In a stable environment, the water vapor pressure within a closed system is in equilibrium with the outside ambient. If the ambient temperature increases, the energy is imparted to the gas pipes and the water molecules within the wall.

  • Page 52: Measurement Cycle

    QMA401 User’s Manual OPERATION Measurement Cycle At the beginning of a measurement cycle V1 is energized. This allows the dried sample gas to be routed to the sensor cell for a period of 30 seconds as shown by the red line in Figure 25 .

  • Page 53: Figure 39 Measurement Cycle (Phase 2) Calibration Flow

    QMA401 User’s Manual OPERATION After a 30 second sampling period, V1 is de-energized. This cuts off the dried gas supply to the sensor cell and V3 is energized connecting the sample gas (red line - see Figure 26) to the sensor cell for a further period of 30 seconds. The reference and sample gas paths are shown in green.

  • Page 54: Calibration Cycle

    QMA401 User’s Manual OPERATION 3.10 Calibration Cycle To maintain the precision of the analyzer, the unit can self calibrate and adjust its internal reference table based on the result. This is achieved as follows: An internal moisture generator uses a permeation tube to generate a nominal moisture content of 0.5, 5 or 50 ppm...

  • Page 55: Figure 41 Calibration Cycle (Phase 2) - Sample Flow

    As the moisture content of the calibration gas is known, the difference between this and the measured value is equal to the error in the system. The QMA401 stores this measured calibration value and automatically compensates subsequent sample readings for any offset that may have occurred to the factory calibration curve.

  • Page 56: Maintenance

    Any loose or disturbed pipework or couplings must be leak tested. The design of the QMA401 and measurement system is such that minimal maintenance is required. However, if a fault does occur with the system that is not covered within this manual please contact Michell Instruments (see contact information at www.michell.

  • Page 57: Removal And Replacement Of The Power Supply Fuse

    QMA401 User’s Manual MAINTENANCE Removal and Replacement of the Power Supply Fuse The fuse can be serviced in the field by an approved Michell Instruments' service technician. Please consult your Michell service representative for spare or replacement parts. Removal and Replacement of the Dryer Module Undo push-catch to open dryer access panel.
  • Page 58 QMA401 User’s Manual MAINTENANCE Remove dryer module. Fit replacement dryer module, following these instructions in reverse to re-assemble. 97450 Issue 2, March 2018...

  • Page 59: Calibration

    If these facilities are not available the analyzer must be returned to the manufacturer, Michell Instruments, or one of their approved agents. A list of worldwide Michell Instruments’ offices is provided at www.michell.com. The analyzer is calibrated at a fixed pressure over the sensing crystals, and the analyzer’s calibration is only valid while the inlet pressure and back pressures have been set correctly.

  • Page 60: Figure 42 Typical Qma401 Calibration Certificate

    QMA401 User’s Manual CALIBRATION Figure 42 Typical QMA401 Calibration Certificate 97450 Issue 2, March 2018...

  • Page 61: Application Software Overview

    QMA401 User’s Manual APPLICATION SOFTWARE APPLICATION SOFTWARE OVERVIEW With the QMA Application Software you can: • Read and edit all main analyzer parameters • Chart and log all main analyzer parameters • Perform a calibration • Reset the analyzer to factory defaults Communication between the application software and analyzer is via Modbus RTU over RS485.

  • Page 62: Getting Started

    QMA401 User’s Manual APPLICATION SOFTWARE Getting Started On launching the software the connection console will appear, allowing you to establish communications between the software and QMA analyzer. Choose the Modbus slave address (default is 1) and the serial COM port that the instrument is connected to.

  • Page 63: Connection Method (Serial Connection (Rs485 Or Usb)

    6.3.1.2 USB Connection If directly connecting via USB, the analyzer will appear in Device Manager as a virtual serial port with the name 'Michell Instruments USB to UART Bridge Controller', followed by its assigned COM port number, e.g. COM3. 6.3.1.3 Modbus TCP Connection (Ethernet) Enter the IP address and port number of the analyzer.

  • Page 64: Main Window

    QMA401 User’s Manual APPLICATION SOFTWARE Main Window The application software will automatically begin acquiring, displaying and charting data from the analyzer once a connection has been established. Data acquisition occurs approximately every 2 seconds. The chart update rate is 2 seconds but this may be changed by using the chart options window.

  • Page 65: Using The Chart

    QMA401 User’s Manual APPLICATION SOFTWARE Using the Chart Chart mode buttons The chart defaults to plot mode. To change the chart mode, click one of the buttons along the top of the chart, described below. Function Description Puts chart into live plot mode...

  • Page 66: Chart Options Window

    QMA401 User’s Manual APPLICATION SOFTWARE 6.5.1 Chart Options Window The Chart Options Window allows the user to configure the following chart properties: Function Description Allows the user to show or hide data series from the chart. Show/hide series Tick to show, untick to hide...

  • Page 67: Data Logging

    QMA401 User’s Manual APPLICATION SOFTWARE Data Logging Click the 'Data Logging' button on the Main Window to launch the Data Logging Setup Window. Choosing a log file filename Choose a log file manually by clicking the button. Click the 'Auto generate' button to generate a filename based on the current date and time.

  • Page 68: Configuring Logging Start Time

    QMA401 User’s Manual APPLICATION SOFTWARE 6.6.1 Configuring Logging Start Time Logging may be started immediately or at a user-defined time in the future. To start logging immediately, select the 'Start when is clicked' option. START To start logging at a user-defined time in the future, select the 'Start at this date/time:' option and enter the date and time when you wish to start logging.

  • Page 69: Field Calibration

    QMA401 User’s Manual APPLICATION SOFTWARE 6.7.1 Field Calibration This window allows manual analyzer calibrations to be performed, and settings for automatic calibrations configured. Michell Instruments...

  • Page 70: Shipping

    QMA401 User’s Manual SHIPPING SHIPPING Preparation for Shipping and Packing For shipping purposes, the instrument should be packed into its original carton, the latter providing the recommended degree of protection during transit. To prepare the instrument for shipping, proceed as follows: Switch off the instrument, isolate the power supply and remove the power supply cable.
  • Page 71 QMA401 User’s Manual APPENDIX A Appendix A Technical Specifications Michell Instruments...

  • Page 72: Appendix A Technical Specification

    QMA401 User’s Manual APPENDIX A Appendix A Technical Specification Performance Measurement Fast Response Quartz Crystal Microbalance Technology Calibrated Range 0.1 to 700ppm Measurement Range 0.1 to 2000ppm ±10% of reading from 1 to 2000 ppm Accuracy ±0.1 ppm between 0.1 & 1 ppm ±5% of the reading from 1 to 2000 ppm...
  • Page 73 QMA401 User’s Manual APPENDIX B Appendix B Calculating Conversion Factors for Gas Mixes Michell Instruments...

  • Page 74: Appendix B Calculating Conversion Factors For Gas Mixes

    Appendix B Calculating Conversion Factors for Gas Mixes Setting the correct flow rate is crucial to correct operation of the QMA401. If the gas being sampled contains multiple components, then the conversion factor must be calculated and entered as a ‘user’...
  • Page 75 QMA401 User’s Manual APPENDIX C Appendix C Modbus Register Map Michell Instruments...

  • Page 76: Appendix C Modbus Holding Register Map

    QMA401 User’s Manual APPENDIX C Appendix C Modbus Holding Register Map All the data values relating to the QMA601 are stored in holding registers. Each of these registers is two bytes (16-bits wide). Some of these registers contain instrument specific values e.g. its own unique system address, IP address values, etc.
  • Page 77 QMA401 User’s Manual APPENDIX C Last Cal - 1 Details Last Cal – 2 Day/Month/Year Last Cal – 2 Details Last Cal – 3 Day/Month/Year Last Cal – 3 Details Last Cal – 4 Day/Month/Year Last Cal – 4 Details User Gas Flow Correction Val1 0.100 to 10.000...
  • Page 78 QMA401 User’s Manual APPENDIX C *Osc Table1 DeltaF 10 Lo Word “ *Osc Table1 DeltaF 11 Hi Word 0.0001 to 2000.0000 *Osc Table1 DeltaF 11 Lo Word “ *Osc Table1 DeltaF 12 Hi Word 0.0001 to 2000.0000 *Osc Table1 DeltaF 12 Lo Word “...
  • Page 79 QMA401 User’s Manual APPENDIX C *Osc Table2 DeltaF 04 Hi Word 0.0001 to 2000.0000 *Osc Table2 DeltaF 04 Lo Word “ *Osc Table2 DeltaF 05 Hi Word 0.0001 to 2000.0000 *Osc Table2 DeltaF 05 Lo Word “ *Osc Table2 DeltaF 06 Hi Word 0.0001 to 2000.0000...
  • Page 80 QMA401 User’s Manual APPENDIX C *Osc Table2 Cal Reference Phase Time 10 to 240 seconds *Osc Table2 Cal Settling Cycles 4 to 240 cycles *Osc Table2 Cal Calibration Cycles 4 to 60 cycles *BLANK Dont Care *Osc Table2 Cal Cell Pressure Reading LoW 0.00 to 10.00 barG...
  • Page 81 QMA401 User’s Manual APPENDIX C Ref Seconds Countdown Pressure Reading of cell in set unit See App A Sample Seconds Countdown Cal Settling / Calibration Cycles Countdown System Status Register Warning Flags Register Current Flow Correction value Moist Gen Value Read After Cal – Hi Word For cal use Moist Gen Value Read After Cal –...

  • Page 82: Table 11 Modbus Register Map

    QMA401 User’s Manual APPENDIX C DeltaF Log t8 Hi Word For cal use DeltaF Log t8 Lo Word For cal use DeltaF Log t9 Hi Word For cal use DeltaF Log t9 Lo Word For cal use Ppmv Log t0 Hi Word...
  • Page 83 QMA401 User’s Manual APPENDIX C Register Configuration A A1 — Unsigned Short. Range = 0 to 65535 A2 — Unsigned Short/10. Range = 0 to 6553.5 A3 — Unsigned Short/100. Range = 0 to 655.35 A4 — Unsigned Short/1000. Range = 0 to 65.535 A5 —...
  • Page 84 QMA401 User’s Manual APPENDIX C Register Configuration C — Modbus Configuration Instrument Address (IA) Protocol Type (PT) 1 to 31 (1=def) 00=RS485 01=USB VCP 10= Ethernet Register Configuration D — System Configuration Temperature/Dew Point units (TU) Pressure for Dew-Point Calculations (PS)
  • Page 85 QMA401 User’s Manual APPENDIX C Register Configuration E — Alarm Configuration Note: Alarm 4 is a system fault/warning alarm and is configured in register 9 (Configuration M) Alarm1 Parameter (A1) Alarm2 Parameter (A2) 0000 = Moisture – PPMv (def) 0000 = Moisture – PPMv...
  • Page 86 QMA401 User’s Manual APPENDIX C 0000 = Moisture – PPMv (def) 0000 = Moisture – PPMv 0001 = Moisture - PPMw 0001= Moisture - PPMw 0010 = Moisture – MGM3 0010 = Moisture – MGM3 0011 = Moisture – PA 0011 = Moisture –...
  • Page 87 QMA401 User’s Manual APPENDIX C Consequently hi word= 4124 and lo word = CCCD - 0.0000045 sign bit = 1 Exponent = -18, therefore exponent field = 127 + (-18) = 109 , and bits 30 to 23 = 0110 1101 The mantissa = 1.179648 which in binary representation = 1001 0110 1111 1110 1011 0101...
  • Page 88 QMA401 User’s Manual APPENDIX C Register Configuration J — Date Date Number (DD) Month Number (MM) 1 to 31 1 to 12 Year Number (YY) or Seconds 00-99 for year or 00-59 for seconds Register Configuration K — Historic Calibration Log — Details...
  • Page 89 QMA401 User’s Manual APPENDIX C Register Configuration M — System Warning Flags (Register 230), Analyzer Status Alarm Relay Selection Mask (Register 9) 1=Warning or fault, 0=OK Warning Condition Oven temperature unstable. Oven temperature has not been 0001 stable within ±0.01C of setpoint for continuous 5 minutes. (Process alarms de-energized, both analog outputs at fault condition Enclosure temperature too high.
  • Page 90 QMA401 User’s Manual APPENDIX C Register Configuration P1 — Next Calibration Configuration Manual or Auto (MA) Internal or External (IE) 0 = Manual 0 = Internal 1 = Auto 1 = External Data Hold (DH) Data Hold Additional Cycles (AC) 0 = off...
  • Page 91 QMA401 User’s Manual APPENDIX C 6 = Send Test String to Sensor Comms Channel* 7 = Send Test String to Display Comms Channel* 10 = Force Analog Output 1 to 4 mA** 11 = Force Analog Output 1 to 20 mA**...
  • Page 92 QMA401 User’s Manual APPENDIX C Register Configuration U — Internal Logging Configuration/Service Interval Days DeltaF and ppm Log Interval in cycles (DP) Ram Buff er Log parameter (RL) Range is 1 to 15 cycles. (for CAL use, def = 1) 0000 = Moisture –...

  • Page 93: Set Points And Ranges

    QMA401 User’s Manual APPENDIX C Set Points and Ranges Set points and ranges for Analog Outputs, Alarms, Fixed User Pressure, Cell Pressure and External (line) Pressure sensor. Adjustment Unit Default Values Register Range Register Type Range/Res. 0.0 to 3000.0 0.0 to 2000.0...

  • Page 94: Gases For Gas Correction Values

    QMA401 User’s Manual APPENDIX C Gases for Gas Correction Values Gases for gas correction values, indexed 0 to 23. If a USER gas is selected then the instrument will use the gas correction values that are set in the respective registers 38, 39 and 40 for the Flow correction and at registers 41, 42 and 43 for the molecular weights.
  • Page 95 QMA401 User’s Manual APPENDIX D Appendix D Quality, Recycling & Warranty Information Michell Instruments...

  • Page 96: Appendix D Quality, Recycling, Compliance & Warranty Information

    APPENDIX D Appendix D Quality, Recycling, Compliance & Warranty Information Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at: www.michell.com/compliance This page contains information on the following directives: •...
  • Page 97 QMA401 User’s Manual APPENDIX E Appendix E Return Document & Decontamination Declaration Michell Instruments...

  • Page 98: Appendix E Return Document & Decontamination Declaration

    Has the equipment been cleaned and decontaminated? NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous Work will not be carried out on any unit that does not have a completed decontamination declaration.
  • Page 100 NOTES QMA401 User’s Manual 97450 Issue 2, March 2018...
  • Page 101 QMA401 User’s Manual NOTES Michell Instruments...
  • Page 102 http://www.michell.com...

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