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Analytical Technology PQ45H Operation Manual

Portable chlorine dioxide measurement system
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Model PQ45H
Portable Chlorine Dioxide
Home Office
Analytical Technology, Inc.
6 Iron Bridge Drive
Collegeville, PA 19426
Ph: 800-959-0299
610-917-0991
Fax: 610-917-0992
Email: sales@analyticaltechnology.com
Measurement
System
European Office
ATI (UK) Limited
Unit 1 & 2 Gatehead Business Park
Delph New Road, Delph
Saddleworth OL3 5DE
Ph: +44 (0)1457-873-318
Fax: + 44 (0)1457-874-468
Email:sales@atiuk.com

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  • Page 1 Model PQ45H Portable Chlorine Dioxide Measurement System Home Office European Office Analytical Technology, Inc. ATI (UK) Limited 6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park Collegeville, PA 19426 Delph New Road, Delph Saddleworth OL3 5DE Ph: 800-959-0299...
  • Page 2 PRODUCT WARRANTY Analytical Technology, Inc. (Manufacturer) warrants to the Customer that if any part(s) of the Manufacturer's equipment proves to be defective in materials or workmanship within the earlier of 18 months of the date of shipment or 12 months of the date of start- up, such defective parts will be repaired or replaced free of charge.
  • Page 3 Table of Contents PART 1 - INTRODUCTION ....... 4 PART 7 – DATA LOGGER (OPTION) .... 49 General ..........5 PART 8 – SYSTEM MAINTENANCE ..... 51 Standard System ......... 5 General ..........51 Features ..........6 Analyzer Battery Replacement ..51 Q45H/65 System Specifications..
  • Page 4 Table of Figures 1 - PQ45 P ....................6 IGURE ORTABLE ONITOR YSTEM 2 - F ....................10 IGURE RONT IEW OF INGED ANEL 3 - S ....................11 IGURE ENSOR AND OMPONENTS 4 - C ....................14 IGURE HLORINE IOXIDE ENSOR 5 - O...

  • Page 5: Part 1 - Introduction

    Part 1 - Introduction General The Model PQ45-65 Portable Chlorine Dioxide Monitor is designed for short-term measurement and data logging of residual chlorine dioxide in water systems. It may also be used for permanent monitoring in locations where solar power systems are available to provide continuous power.

  • Page 6: Features

    PQ45H Portable Chlorine Dioxide System Part 1 – Introduction Figure 1 - PQ45 Portable Monitor System Features · Standard main module is designed to be a fully isolated, battery-powered instrument. An optional arrangement provides for external power from a 10-16 VDC supply.
  • Page 7 PQ45H Portable Chlorine Dioxide System Part 1 – Introduction · Large, high contrast, custom Super-Twist display with LED backlight provides excellent readability even in low light conditions. A secondary line of display utilizes 5x7 dot matrix characters for clear message display. Two measured parameters may be on the display simultaneously.

  • Page 8: Q45H/65 System Specifications

    PQ45H Portable Chlorine Dioxide System Part 1 – Introduction Q45H/65 System Specifications Displayed Parameters Main input, 0.1 ppb (0.0001 ppm) to 20.00 ppm Sensor temperature, -10.0 to 55.0 °C (23 to 131 ºF) Sensor Current, 0.0–999.9 nA, 0.000 to 99.99 uA Output Voltage, 0-2.5 VDC...

  • Page 9: Q45H Performance Specifications

    PQ45H Portable Chlorine Dioxide System Part 1 – Introduction Optional pH Input Combination pH sensor with 18” (46 cm) cable for direct connection to electronics. Flow Cell Sealed acrylic flowcell factory assembled with polyurethane sample and drain tubing. Second acrylic flowcell supplied if optional pH sensor is installed.

  • Page 10: Part 2 – System Components

    Part 2 – System Components General The PQ45 Portable ClO Monitoring System comes complete in a rugged molded case, and is designed to be operated by simply setting the case in the desired location, connecting sample and drain tubes, and turning on the power. However, when received, the sensors are not yet ready for use, and the user must first prepare the chlorine dioxide sensor and pH sensor if supplied.
  • Page 11 PQ45H Portable Chlorine Dioxide System Part 2 – System Components Internal Flow System The “Wet” section of the analyzer is located on the back of the internal hinged panel. The panel is held in place by two captive screws on the right side.
  • Page 12 Remove the screen and rinse as needed to remove any accumulated solids. Sensor Polarizer Each PQ45H chlorine dioxide system is supplied with a “sensor polarizer” designed to facilitate stabilization of the ClO sensor, and to keep the sensor in a state where it is ready for use immediately, even if the analyzer is turned off.
  • Page 13 PQ45H Portable Chlorine Dioxide System Part 2 – System Components Water Sample Connections On the hinged side of the case are two quick-disconnect fittings marked INLET and OUTLET. This is where you will connect your water sample. These connectors contain valves that automatically close when the mating connector is removed.

  • Page 14: Part 3 – Sensor Preparation

    Part 3 – Sensor Preparation Chlorine Dioxide Sensor Preparation The ClO sensor supplied with the PQ45H is shipped dry. It will not operate until it is prepared by adding electrolyte and a membrane. Preparation of the sensor for operation must be done carefully.
  • Page 15 PQ45H Portable Chlorine Dioxide System Part 3 – Sensor Preparation 4. Screw the front nut on to the chamber until you feel the o-ring compress. Hand tight compression is all that is needed. Do not use tools to tighten. The membrane should be flat across the bottom of the chamber without wrinkles.

  • Page 16: Sensor Polarizer (Keeper)

    Optional pH Sensor The optional pH sensor available for use with the PQ45H system is a combination pH/reference electrode with a stainless steel solution ground. It is directly connected to the electronics assembly and is held in place in the flowcell with a twist-lock arrangement on the cap.
  • Page 17 PQ45H Portable Chlorine Dioxide System Part 3 – Sensor Preparation To remove the pH sensor from the flowcell, turn the sensor until the twist-lock pins line up with the insertion slots and CAREFULLY pull the sensor upward. Be very careful removing the sensor as it is easily broken.

  • Page 18: Part 4 – Electrical Assembly

    Part 4 – Electrical Assembly General PQ45 Portable Analyzers are factory wired and are ready to operate as received. If units were supplied with the optional data logger, voltage output cables that plug into the logger will be supplied. If no logger was purchased with the unit, these cables will not be installed.

  • Page 19: Battery / Power Circuit Board

    Part 4 – Electrical Assembly Battery / Power Circuit Board PQ45H monitors are normally powered by internal C-cell alkaline batteries or by an external power connection. Figure 7 shows this board assembly with batteries installed. Figure 8 shows the same board with terminals installed for external power connection.
  • Page 20 External Power / Output Connections PQ45H units ordered with the external connection option are designed for applications where power is to be supplied from an external source, and the two voltage outputs are to be wired to an external device. If that option has been supplied, an interface cable will be provided.
  • Page 21 PQ45H Portable Chlorine Dioxide System Part 4 – Electrical Assembly Figure 8 - Battery Board w/Ext. Power Terminals Figure 9 - External Connection Cable Color Code O&M Manual Rev-C (7/15)

  • Page 22: User Interface

    Part 5 – Operation User Interface To turn the system ON, simply press the MENU key and the display will come on. Once the instrument is turned on, it will run continuously until it is turned off manually or the batteries are consumed. To turn the unit off, press and hold the ENTER key until the display shuts off (about 3 seconds).

  • Page 23: Battery Power Circuit Board

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation Battery Power Circuit Board The Q45 portable instrument is primarily operated by software settings. However, there are also a few hardware details on the battery circuit board to note. The battery board is a circuit board that sits in the rear of the Q45 enclosure, and connects to the Q45 AUX port through a ribbon cable.

  • Page 24: External Power

    Maintaining Sensor Stability Chlorine dioxide sensor stability is maintained as long as the PQ45H electronic unit is turned on. When the electronics are shut off, the sensor bias is removed and time will be required for restabilization when power is turned on again. To avoid the time delay, install the “sensor polarizer”...

  • Page 25: User Interface

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation User Interface The user interface for the Q45 Series instrument consists of a custom display and a membrane keypad. All functions are accessed from this user interface (no internal jumpers, pots, etc.).

  • Page 26: Keys

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation 5.71 Keys All user configurations occur through the use of four membrane keys. These keys are used as follows: MENU/ESC To scroll through the menu section headers or to escape from anywhere in software. The escape sequence allows the user to back out of any changes in a logical manner.
  • Page 27 PQ45H Portable Chlorine Dioxide System Part 5 – Operation Lower Line During normal operation, the lower line of the display indicates user-selected secondary measurements that the system is making. This also includes calibration data from the last calibration sequence and the transmitter model number and software version.

  • Page 28: Software

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation Icon B The left screen area contains one “B” icon that indicates that the battery voltage is at a low level. (The “A” indicator is not used in battery-powered units). Software The software of the Q45H is organized in an easy to follow menu-based system.
  • Page 29 PQ45H Portable Chlorine Dioxide System Part 5 – Operation Any data that may be changed will be flashing. This flashing indicates user entry mode and is initiated by pressing the ENTER key. The UP arrow key will increase a flashing digit from 0 to 9. The LEFT arrow key moves the flashing digit from right to left.
  • Page 30 PQ45H Portable Chlorine Dioxide System Part 5 – Operation Start MENU MEASURE CONFIG CONTROL DIAG SECTIONS (display only) Entry Lock Cal ClO2 Set Hold Set 0V #1 * mV Set Delay * Cal pH Fault List Set 2.5V #1 Temperature...

  • Page 31: Measure Menu [Measure]

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation 5.82 Measure Menu [MEASURE] The default menu for the system is the display-only menu MEASURE. This menu is a display-only measurement menu, and has no changeable list items. When left alone, the instrument will automatically return to this menu after approximately 30 minutes.

  • Page 32: Calibration Menu [Cal]

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation Offset = 0.0 nA Sensor output current at a zero ppm input. This value updates after a zero-calibration has been performed. Useful for resolving sensor problems. Q45H0 v 4.00 Transmitter software version number.

  • Page 33: Configuration Menu [Config]

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation Set Range This function allows the user to set the display range of the transmitter to a specific application. Once set, all output functions use this display range to establish configuration settings.
  • Page 34 PQ45H Portable Chlorine Dioxide System Part 5 – Operation The STN display provides the highest possible contrast and widest viewing angle under all conditions. Contrast control of this type of display is generally not necessary, so contrast control is provided as a means for possible adjustment due to aging at extreme ranges.
  • Page 35 PQ45H Portable Chlorine Dioxide System Part 5 – Operation pH Sensor Type This routine allows selection of the type of pH sensor used in the system. The electronics are capable of accepting either a standard combination pH sensor or a Q22 preamplified sensor.

  • Page 36: Control Menu [Control]

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation TABLE 1 TABLE 2 4.00 pH 7.00 pH 10.00 pH 4.00 pH 7.00 pH 9.18 pH ºC °C °C ºC °C °C 4.00 7.10 10.27 4.00 7.10 9.46 3.99 7.06 10.15 3.99...

  • Page 37: Diagnostics Menu [Diag]

    PQ45H Portable Chlorine Dioxide System Part 5 – Operation Set 0V Set 2.5V #1 Set 0V Set 2.5V #2 These functions set the output range for each of the two instrument outputs. The value stored for the 0V point may be higher or lower than the value stored for the 2.5V point.
  • Page 38 PQ45H Portable Chlorine Dioxide System Part 5 – Operation engaging the HOLD function, and OFF to disengage the function. Press ENTER to store the new value. Note: When the Relay Option Board is installed, the Set Hold function holds BOTH current levels, as well as ALL relay settings.
  • Page 39 PQ45H Portable Chlorine Dioxide System Part 5 – Operation Sim Out The Sim Out function allows the user to simulate the chlorine dioxide level of the instrument in the user selected display range. The user enters a ppm value directly onto the screen, and the output responds as if it were actually receiving the signal from the sensor.
  • Page 40 PQ45H Portable Chlorine Dioxide System Part 5 – Operation Set Default The Set Default function allows the user to return the instrument back to factory default data for all user settings or for just the calibration default. It is intended to be used as a last resort troubleshooting procedure.

  • Page 41: Part 6 – Calibration

    Part 6 – Calibration Chlorine Dioxide Calibration Once power is applied, the sensor must be given time to stabilize. This is best done by simply allowing the instrument to run connected to tap water overnight. A complete calibration will include zeroing and spanning the sensor. It is generally unnecessary to set the sensor zero unless the monitor will be used primarily for measurements below 0.5 PPM.

  • Page 42: Chlorine Dioxide Span Cal

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration The system now begins acquiring data for the sensor zero calibration value. As data is gathered, the units for sensor current in nanoamps (nA) and temperature may flash. Flashing units indicate that this parameter is unstable.
  • Page 43 PQ45H Portable Chlorine Dioxide System Part 6 – Calibration 3. Allow the system to operate undisturbed for 5-10 minutes. Assuming the water contains chlorine dioxide, the display will be reading positive sensor current values. If the system is stable, the value on the display will increase to some PPM value and remain at that level.

  • Page 44: Temperature Calibration

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration Temperature Calibration The temperature calibration sequence is essentially a 1-point offset calibration that allows adjustments of approximately ±5 °C. The sensor temperature may be calibrated on line, or the sensor can be removed from the process and placed into a known solution temperature reference.

  • Page 45: Ph Calibration

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration pH Calibration The pH calibration menus will not be seen unless the optional pH sensor input is turned ON and a special pH sensor is connected to the input of the instrument.

  • Page 46: One-Point Ph Cal

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration attempting to recognize the first buffer value from the two values entered into the Set Buffers selection. 7. The screen will display the buffer value to be used for calibration. If the user chooses to change this value, the arrow keys can be used to modify the value.

  • Page 47: Rev-C (7/15

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration The 1-point, or sample calibration method does not utilize the automatic buffer recognition and compensation system. This calibration method is intended to be primarily used as an on-line calibration method, in which the actual calibration point will not be a buffer value.

  • Page 48: Rev-C (7/15

    PQ45H Portable Chlorine Dioxide System Part 6 – Calibration value. The user must then modify the screen value with the arrow keys and press ENTER. The system then performs the proper checks. 6. If accepted, the screen will display the message PASS with the new offset reading, and then it will return to the main measurement display.

  • Page 49: Part 7 – Data Logger (Option)

    The software and the USB to Logger cable are provided in the foam insert behind the hinged panel of the PQ45H. Prior to operating the logger, the software must be installed on your computer.
  • Page 50 PQ45H Portable Chlorine Dioxide System Part 7 – DataLogger The cable supplied with the software provides a USB connector on one end and a special connector that plugs into the data logger on the other end. If you are using an older computer equipped only with an RS-232 port, special RS-232 to USB cables are available commercially that will allow you to adapt to the logger.

  • Page 51: Part 8 – System Maintenance

    Part 8 – System Maintenance General The Q45H/65 Chlorine Dioxide System will generally provide unattended operation over long periods of time. With proper care, the system should continue to provide measurements indefinitely. For reliable operation, maintenance on the system must be done on a regular schedule. Keep in mind that preventive maintenance on a regular schedule is much less troublesome than emergency maintenance that always seems to come at the wrong time.

  • Page 52: Sensor Acid Cleaning

    PQ45H Portable Chlorine Dioxide System Part 8 – System Maintenance Refer again to the explanation of the sensor slope number after an accepted span calibration on the lower MEASURE screen. In normal operation, the slope of the sensor output will decrease over time as the membrane becomes fouled.

  • Page 53: Flow Cell Maintenance

    PQ45H Portable Chlorine Dioxide System Part 8 – System Maintenance 2. Allow the sensor to soak in this acid solution for 2 minutes. Remove the sensor body and rinse the platinum tip thoroughly with distilled water. Discard the nitric acid safely and according to all environmental regulations.

  • Page 54: Part 9 – Troubleshooting

    Part 9 – Troubleshooting General The information included in this section is intended to be used in an attempt to quickly resolve an operational problem with the system. During any troubleshooting process, it will save the most time if the operator can first determine if the problem is related to the analyzer, sensor, or some external source.

  • Page 55: Analyzer Tests

    PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting Analyzer Tests 1. Disconnect power and completely disconnect all output wiring coming from the analyzer. Remove sensor wiring, relay wiring, and analog output wiring. Re-apply power to the analyzer. 2. Using the Simulate feature, check operation of outputs with a DMM.

  • Page 56: Display Messages

    PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting Display Messages The Q45 Series instruments provide a number of diagnostic messages which indicate problems during normal operation and calibration. These messages appear as prompts on the secondary line of the display or as items on the Fault List.
  • Page 57 PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting MESSAGE DESCRIPTION POSSIBLE CORRECTION Cal Fail Failure of chlorine dioxide calibration. FAIL Clean sensor redo zero and span calibration. icon will not extinguish until successful If still failure, sensor slope may be less than calibration has been performed, or 30 25% or greater than 250%.

  • Page 58: Sensor Tests

    PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting Sensor Tests 1. Check the membrane condition. A membrane that is not stretched smoothly across the tip of the sensor will cause unstable measurements. If necessary, change membrane and electrolyte. 2. Residual ClO sensors can be tested with a digital voltmeter (DVM) to determine if a major sensor problem exists.
  • Page 59 PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting Temperature Resistance °C 100.0 101.9 103.9 105.8 107.8 109.7 111.7 113.6 115.5 117.5 119.4 Figure 16 - Pt100 RTD Table If you suspect that water has gotten into a cable connection on a flow type sensor or into the plug connection of a submersible sensor, disconnect the cable and allow the parts of the sensor to sit in a warm place for 24 hours.

  • Page 60: Spare Parts

    PQ45H Portable Chlorine Dioxide System Part 9 – Troubleshooting Spare Parts Part No. Description 03-0338 PQ45H-65 Chlorine Dioxide Front Electronic Assembly 01-0240 Battery circuit board with dual 0-2.5 VDC output 45-0253 Flowcell for ClO sensor 42-0014 O-ring for 45-0253 flowcell...

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