Analytical Technology Q46H/62-63 Manual
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Analytical Technology Q46H/62-63 Manual

Free chlorine measurement system
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Model Q46H/62
Home Office
Analytical Technology, Inc.
6 Iron Bridge Drive
Collegeville, PA19426
Ph: 800-959-0299
610-917-0991
Fax: 610-917-0992
Email: sales@analyticaltechnology.com
Free Chlorine
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 Q46H/62 Free Chlorine Measurement System Home Office European Office Analytical Technology, Inc. ATI (UK) Limited 6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park Collegeville, PA19426 Delph New Road, Delph Saddleworth OL3 5DE Ph: 800-959-0299 Ph: +44 (0)1457-873-318...
  • 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

    Table of Contents PART 1 - INTRODUCTION .......... 5 PART 7 – CALIBRATION........... 57 1.1 G ............5 ENERAL 7.1 C ........57 HLORINE ALIBRATION 1.2 S ..........6 TANDARD YSTEM 7.11 C ......... 57 HLORINE 1.3 F ............9 EATURES 7.12 C .........
  • Page 4 ABLE OF IGURES 1 - T ..............6 IGURE YPICAL HLORINE ONITORING YSTEM 2 - C ..........7 IGURE HLORINE YSTEM W ONVENTIONAL P TYLE ENSOR 3 - S ..........8 IGURE EALED LOWCELL SSEMBLIES WITH ONTROL 4 - Q46 E ...................

  • Page 5: Part 1 - Introduction

    Part 1 - Introduction General The Model Q46H/62 is a versatile on-line monitoring system designed for the continuous measurement of free chlorine in solution. The full scale operating range of the system is user selectable for 0-200.0 ppb, 0-2.000 ppm, 0-20.00 PPM, or 0-200.0 ppm, and the sensing system will operate on water streams with temperatures from 0 to 55°C.

  • Page 6: Standard System

    Q46H/62 Free Chlorine System Part 1 - Introduction Standard System The standard model Q46H/62 system includes three main components, the Q46H analyzer, a constant head flow cell, and a free chlorine sensor. A sealed flowcell is also available for applications where sample flow rate and pressure can be carefully controlled.

  • Page 7: Figure 2 - Chlorine System W

    Q46H/62 Free Chlorine System Part 1 - Introduction Figure 2 below shows the same standard flowcell assembly and chlorine sensor along with the conventional type pH sensor. A special adapter is required to hold the pH sensor in its proper location in the flowcell inlet chamber. Figure 2 - Chlorine System w/Conventional pH Style Sensor O&M Manual Rev-M (8/17)
  • Page 8 Q46H/62 Free Chlorine System Part 1 - Introduction Figure 3 below shows an installation using a 00-1522 sealed flowcell for the chlorine sensor and a 00-1527 sealed flowcell for the pH sensor. This type of installation requires careful flow control. We recommend the use of our 03-0372 flow control assembly when using sealed flowcells.

  • Page 9: Features

    Q46H/62 Free Chlorine System Part 1 - Introduction Features · Standard Q46H/62 analyzers have fully isolated inputs and outputs. Analog outputs are additionally completely isolated from each other. · Available in either 90-260VAC or 12-24 VDC power supply systems. All features remain the same in both variations.
  • Page 10 Q46H/62 Free Chlorine System Part 1 - Introduction · Selectable Output Fail Alarm feature allows system diagnostic failures to be sent to external monitoring systems. · Large, high contrast, custom LCD display with LED back light provides excellent readability in any light conditions. The secondary line of display utilizes 5x7 dot matrix characters for clear message display.

  • Page 11: Q46H/62 System Specifications

    Q46H/62 Free Chlorine System Part 1 - Introduction Q46H/62 System Specifications Displayed Parameters Main input, 0.1 ppb (0.0001 ppm) to 200.0 ppm Sensor temperature, -5.0 to 55.0 °C (23 to 131 ºF) Sensor Current, 0.0–999.9 nA, 0.000 to 99.99 uA Loop current, 4.00 to 20.00 mA Sensor slope/offset Model number and software version...
  • Page 12 Q46H/62 Free Chlorine System Part 1 - Introduction Temperature Input Pt100 RTD, 3-wire type Sensor 2-electrode polarographic membraned sensor for direct measurement of chlorine Sensor Materials Noryl and stainless steel Sensor Cable 25 ft. (7.5 meter) cable with 6-pin plug Max.

  • Page 13: Q46H Performance

    Q46H/62 Free Chlorine System Part 1 - Introduction Q46H Performance Specifications Accuracy 0.5% of selected range or 0.02 PPM Repeatability 0.3% of selected range or 0.01 PPM Sensitivity 0.05% of selected range Non-linearity 0.1% of selected range Warm-up Time 3 seconds to rated performance (electronics only) Supply Voltage Effects ±...

  • Page 14: Part 2 - Analyzer Mounting

    Part 2 – Analyzer Mounting General All Q46 Series instruments offer maximum mounting flexibility. A bracket is included with each unit that allows mounting to walls or pipes. In all cases, choose a location that is readily accessible for calibrations. Also consider that it may be necessary to utilize a location where solutions can be used during the calibration process.

  • Page 15: Wall Or Pipe Mount

    Q46H/62 Free Chlorine System Part 2 – Analyzer Mounting Wall or Pipe Mount A PVC mounting bracket with attachment screws is supplied with each analyzer (see Figure 5for dimensions). The multi-purpose bracket is attached to the rear of the enclosure using the four flat head screws. The instrument is then attached to the wall (Figure 6) using the four outer mounting holes in the bracket.

  • Page 16: Figure 6 - Wall Mountingd

    Q46H/62 Free Chlorine System Part 2 – Analyzer Mounting Figure 6 - Wall Mounting Diagram Figure 7 - Pipe Mounting Diagram O&M Manual Rev-M (8/17)

  • Page 17: Panel Mounting

    Q46H/62 Free Chlorine System Part 2 – Analyzer Mounting Panel Mounting Panel mounting uses the panel mounting flange molded into the rear section of the enclosure. Figure 8provides dimensions for the panel cutout required for mounting. The panel mounting bracket kit must be ordered separately (part number 05- 0094).

  • Page 18: Part 3 - Sensor/Flowcell Mounting

    Part 3 – Sensor/Flowcell Mounting General Select a location within the maximum sensor cable length for mounting of the sensor flow cell. Constant-Head Flowcell Free chlorine sensors are best used in a constant-head overflow chamber because variations in sample flow rate and pressure can cause unstable readings.

  • Page 19: 3.3 Sealed Flowcell

    Q46H/62 Free Chlorine System Part 3 – Sensor/Flowcell Mounting Once mounted, inlet and drain connections must be made. The flow cell contains a ⅛" MNPT inlet connection and a ⅜" MNPT drain connection. Hose barbs for the inlet and drain connections are supplied with the flow cell for use with flexible tubing.

  • Page 20: Figure 11 - Sealed P H F

    Q46H/62 Free Chlorine System Part 3 – Sensor/Flowcell Mounting Figure 11 - Sealed pH Flowcell Details O&M Manual Rev-M (8/17)

  • Page 21: Part 4 - Electrical Installation

    Part 4 – Electrical Installation General The Q46 is powered in one of two ways, depending on the version purchased. The 12-24VDC powered analyzer requires a customer supplied DC power supply. The 90-260VAC version requires line power. Please verify the type of unit before connecting any power.

  • Page 22: Power Connection

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation There is no standard ground resistance universally recognized. Many agencies recommend a ground resistance value of 5 ohms or less. The NEC recommends an impedance to ground of less than 25 ohms, and less than 5 ohms where sensitive equipment is installed.

  • Page 23: Figure 12 - Line Powerc

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Figure 12 - Line Power Connection The power strip, TB7, allows up to 12 AWG wire. A wire gauge of 16 AWG is recommended to allow for an easy pass-through into the ½” NPT ports when wiring.
  • Page 24 Q46H/62 Free Chlorine System Part 4 – Electrical Installation Relay Connection Three SPDT relays are provided on the power supply board. None of the relay contacts are powered. The user must supply the proper power to the contacts. For applications that require the same switched operating voltage as the Q46 (115 or 230 V), power may be jumpered from the power input terminals at TB7.

  • Page 25: Figure 15 - Optional Analog

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation TB2, is used to connect to the optional 3-relay card (Figures 14) OR the optional third analog outputOut#3, (Figure 15). The Q46 can be configured for only one of these optional features, and the hardware for either option must be factory installed. Figure 14 - Optional Relay Board Wiring Figure 15 - Optional Analog Output Wiring O&M Manual...

  • Page 26: Direct Sensor Connection

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Direct Sensor Connection The sensor cable can be routed into the enclosure through one of cord-grips supplied with the unit. Routing sensor wiring through conduit is only recommended if a junction box is to be used. Some loose cable is needed near the installation point so that the sensor can be inserted and removed easily from the flowcell.

  • Page 27: Sensor Wiring

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Sensor Wiring The sensor cable can be quickly connected to the Q46 terminal strip by matching the wire colors on the cable to the color designations on the label in the monitor. A junction box is also available to provide a break point for long sensor cable runs.

  • Page 28: Junction Box Connection

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Junction Box Connection Installations where the sensor is to be located more than 25 feet from the monitor (max. 100 feet) require the use of a junction box. The junction box is shown in, and is supplied with two cable glands on the bottom of the enclosure.

  • Page 29: Optional P H Compensation

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Optional pH Compensation Input The Q46H may be configured for pH compensation to maintain excellent accuracy in applications where the pH can vary. To utilize the feature, a pH sensor must be connected to terminals 3 and 5 as shown Figure 17. Note that jumpers are installed at the factory between terminals 3 and 5, and terminals 6 and 9.

  • Page 30: Figure 19 - Junction Boxw

    Q46H/62 Free Chlorine System Part 4 – Electrical Installation Note: The BLUE wire is NOT used when connecting a Flow Style Probe to the analyzer Figure 19 - Junction Box Wiring w/Optional pH Comp. O&M Manual Rev-M (8/17)

  • Page 31: Part 5 - Sensor Assembly

    Part 5 – Sensor Assembly Chlorine Sensor Preparation The chlorine sensor supplied with the Q46H 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. The procedure should be done by a qualified technician, and it should only be done when the system is ready for operation.

  • Page 32: Optional Ph Sensors

    Q46H/62 Free Chlorine System Part 5 – Sensor Assembly 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. 5.

  • Page 33: Part 6 - Configuration

    Part 6 – Configuration User Interface The user interface for the Q46 Series instrument consists of a custom display and a membrane keypad. All functions are accessed from this user interface (no internal jumpers, pots, etc.). RELAY 4-DIGIT INDICATOR MAIN DISPLAY MENU ICONS MENU ICONS SIGN...

  • Page 34: 6.11 Keys

    Q46H/62 Free Chlorine System Part 6 – Configuration 6.11 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 35 Q46H/62 Free Chlorine System Part 6 – Configuration 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 analyzer model number and software version.

  • Page 36: Software

    Q46H/62 Free Chlorine System Part 6 – Configuration Relay Area A/B The relay area contains two icons that indicate the state of the system relays (if the relay card is installed). Relay C is normally configured for FAIL indication, so it is only displayed on the lower MEASURE display line.
  • Page 37 Q46H/62 Free Chlorine System Part 6 – Configuration 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 38: Figure 22 - Software Map

    Q46H/62 Free Chlorine System Part 6 – Configuration MENU MEASURE CONFIG CONTROL DIAG SECTIONS Temperature Entry Lock Cal Cl2 Set Hold PID 0% #1 PID 100% #1 Fault List Cal pH Set Delay PID % Output PID S etpoint #1 Sim Out Contrast Cal Temp...

  • Page 39: [Measure]

    Q46H/62 Free Chlorine System Part 6 – Configuration 6.22 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 40: [Cal]

    Q46H/62 Free Chlorine System Part 6 – Configuration Offset = 0.0 nA Sensor output current at a zero ppm input. This value updates after a zero-calibration has been performed. This is useful for resolving sensor problems. Q46H0 v 4.02 Analyzer software version number. 7.56 pH Measured pH value on AUX input (if enabled.) 814 mV...

  • Page 41: [Config]

    Q46H/62 Free Chlorine System Part 6 – Configuration Cal Temp The temperature calibration function allows the user to adjust the offset of the temperature response by a small factor of ±5 °C. The temperature input is factory calibrated to very high accuracy. However, long cable lengths and junction boxes may degrade the accuracy of the temperature measurement in some extreme situations.
  • Page 42 Q46H/62 Free Chlorine System Part 6 – Configuration flash. Use the arrow keys to modify value; range is 0.1 to 9.9 minutes. Press ENTER to store the new value. Contrast This function sets the contrast level for the display. The custom display is designed with a wide temperature range, Super-Twist Nematic (STN) fluid.
  • Page 43 Q46H/62 Free Chlorine System Part 6 – Configuration Com Address Sets bus address for digital communication mode of analyzer. Optional digital communication card must be plugged into the power supply slot for this function to work. Press ENTER to initiate user entry mode, and the entire value will flash.
  • Page 44 Q46H/62 Free Chlorine System Part 6 – Configuration The AL setting allows two set points to be selected for the same relay, producing a HI-LO alarm band. In this mode, Relay A will trip inside or outside of the band, depending upon the Phase selected.
  • Page 45 Q46H/62 Free Chlorine System Part 6 – Configuration pH Input Enables the auxiliary pH input on the instrument. Once enabled, an optional pH sensor can be added to the instrument to provide for additional monitoring of pH (dual instrument, chlorine + pH output.) The pH signal can also be sent to one of the analog outputs for monitoring of pH.

  • Page 46: Figure 23 - Automatic P H B

    Q46H/62 Free Chlorine System Part 6 – Configuration 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 7.06 9.33 4.00...

  • Page 47: [Control]

    Q46H/62 Free Chlorine System Part 6 – Configuration pH Comp Enables pH compensation of free chlorine measurements using a built in comp table. An optional pH sensor is required for this compensation method, and “pH Input” menu item above must be selected to be ON. pH type must also be selected.
  • Page 48 Q46H/62 Free Chlorine System Part 6 – Configuration PID Setpnt [Iout1=PID] The measured value which the controller is attempting to maintain by adjusting output value. It is the nature of the PID controller that it never actually gets to the exact value and stops.
  • Page 49 Q46H/62 Free Chlorine System Part 6 – Configuration The value stored for the 4 mA point may be higher or lower than the value stored for the 20 mA point. The entry values are limited to values within the range specified in “Set Range”, and the 4 mA and the 20 mA point must be separated by at least 1% of this range Use the LEFT arrow key to select the first digit to be modified.
  • Page 50 Q46H/62 Free Chlorine System Part 6 – Configuration Use arrow keys to modify value. Press ENTER to store the new value. A Setpoint This function establishes the chlorine trip point for relay A. The entry value is limited to a value within the range specified in “SetRange”.

  • Page 51: Figure 24 - Control Relay

    Q46H/62 Free Chlorine System Part 6 – Configuration See Figure 24 below for a visual description of a typical control relay application. When value rises to ≥ 1.000 ppm, relay When value rises to ≥ 1.050 ppm, closes. relay opens. 1.000 ppm 1.050 ppm HYSTERESIS...

  • Page 52: Figure 25 - Alarm Relaye

    Q46H/62 Free Chlorine System Part 6 – Configuration When value rises to ≥ 1.000 ppm, relay When value falls to < 1.000 ppm, relay closes, until value falls back to < 0.950 closes, until rises back to > 1.050 ppm. ppm.

  • Page 53: [Diag]

    Q46H/62 Free Chlorine System Part 6 – Configuration 6.26 Diagnostics Menu [DIAG] The diagnostics menu contains all of the user settings that are specific to the system diagnostic functions, as well as functions that aid in troubleshooting application problems. Set Hold The Set Hold function locks the current loop output values on the present process value, and halts operation of the PID controller.
  • Page 54 Q46H/62 Free Chlorine System Part 6 – Configuration Faults are not stored; therefore, they are immediately removed if power is cycled. If the problem causing the faults still exists, however, faults will be displayed again after power is re-applied and a period of time elapses during which the diagnostic system re-detects them.
  • Page 55 Q46H/62 Free Chlorine System Part 6 – Configuration The starting display value in SIM mode will be the last read value of the input. The output will be under control of the SIM screen until the ESC key is pressed. The instrument will automatically terminate the simulated output after 30 minutes and return to normal operation unless the “HOLD”...
  • Page 56 Q46H/62 Free Chlorine System Part 6 – Configuration *Fail Val #3 OPTIONAL. This function sets the value of current loop output #3 under a FAIL condition. The settings and operation are identical to Fail Out for output #1. Backlight This function has three options. ON – On all the time, OFF – Off all the time, AL –...

  • Page 57: Part 7 - Calibration

    Part 7 – Calibration Chlorine Calibration After power is applied, the sensor must be given time to stabilize. This is best done by following the zeroing procedure below. Establishing a stable zero is critical to the proper operation of the monitor. A complete calibration will include zeroing and spanning the sensor.

  • Page 58: Hlorine Span Cal

    Q46H/62 Free Chlorine System Part 7 – 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 59 Q46H/62 Free Chlorine System Part 7 – Calibration 1. Place the previously zeroed sensor into the sensor chamber of the flow cell assembly. The sensor is inserted into the side of the flow cell and is sealed in place with a double o-ring. The o-rings are lubricated at the factory to allow the sensor to slide smoothly into place.

  • Page 60: Emperature Calibration

    Q46H/62 Free Chlorine System Part 7 – Calibration 9. If accepted, the screen will display the message PASS with the new sensor slope reading, and then it will return to the main measurement display. If the calibration fails, a message indicating the cause of the failure will be displayed and the FAIL icon will be turned on.

  • Page 61: Ph Calibration

    Q46H/62 Free Chlorine System Part 7 – Calibration 5. The message Adjust value - press ENTER will be displayed, and the right- most digit will begin to flash, indicating that the value can be modified. Using the UP and LEFT arrow keys, modify the value to the known ref solution temperature.

  • Page 62: Wo -Point P H Cal

    Q46H/62 Free Chlorine System Part 7 – Calibration A full calibration of the pH sensor consists of an initial 2-point calibration in buffers. This sets the slope and zero offset of the sensor. The sensor should then be left in the process water for enough time for the system to fully stabilize to process conditions.

  • Page 63: Ne -Point P H Cal

    Q46H/62 Free Chlorine System Part 7 – Calibration 9. Press the ENTER key. The display will begin to flash. Using the UP and LEFT arrow keys, adjust the displayed number to the known value of the second (higher or lower value) pH buffer. Once value has been adjusted, press the ENTER key.

  • Page 64: Djusting P H Compensation Curve

    Q46H/62 Free Chlorine System Part 7 – Calibration 7.4 Adjusting pH Compensation Curve If the pH input is ON and the pH Comp feature is enabled (see section 6.23 Calibration Menu [CAL]), then the chlorine reading will be automatically adjusted for changes in the pH measurement.
  • Page 65 Q46H/62 Free Chlorine System Part 7 – Calibration Access to the menu that allows editing of correction factors is hidden. Accidental adjustment of these values can cause large measurement errors, and editing of this data should only be done by those who thoroughly understand the impact of the changes they are making.

  • Page 66: P H Correction - Table Modification

    Q46H/62 Free Chlorine System Part 7 – Calibration AC Go: This routine refers to “Auto Calculate”. This routine allows an operator to circulate water with a constant chlorine value through the system, changing the pH and storing the calculated pH correction value under dynamic conditions.

  • Page 67: Toring Modified Table

    Q46H/62 Free Chlorine System Part 7 – Calibration When you reach the pH value of 9.55, pressing the key will display a multiplier of 4.850, again assuming no changes have been made previously. You can calculate your new multiplier value by calculating how much added multiplier is needed to get to the correct chlorine value.

  • Page 68: Part 8 - Pid Controller Details

    Part 8 – PID Controller Details PID Description PID control, like many other control schemes, are used in chemical control to improve the efficiency of chemical addition or control. By properly tuning the control loop that controls chemical addition, only the amount of chemical that is truly required is added to the system, saving money.
  • Page 69 Q46H/62 Free Chlorine System Part 8 – PID Controller Details é ù ò output ê ë ú û Where: output = controller output proportional gain integral gain derivative gain time e(t) = controller error (e=measured variable – setpoint) Figure 27 - Q46H ISA PID Equation The most notable feature of the algorithm is the fact the proportional gain term affects all components directly (unlike some other algorithms - like the “series”...

  • Page 70: Lassical Pid Tuning

    Q46H/62 Free Chlorine System Part 8 – PID Controller Details Derivative gain. The addition of derivative control can be problematic in many applications, because it greatly contributes to oscillatory behavior. In inherently slow chemical control process’, differential control is generally added in very small amounts to suppress erratic actions in the process that are non-continuous, such as pumps and valves clicking on and off.

  • Page 71: Anual Pid Override Control

    Q46H/62 Free Chlorine System Part 8 – PID Controller Details Manual PID Override Control The Q46 PID output function allows the user to take manual control of the PID control signal. This is often useful when starting up a control loop, or in the event that you wish to bump the system manually to measure system response time.
  • Page 72 Q46H/62 Free Chlorine System Part 8 – PID Controller Details The easiest processes to control with closed-loop schemes are generally linear, and symmetrical, in nature. For example, controlling level in tank where the opening of valve for a fixed period of time corresponds linearly to the amount that flows into a tank.

  • Page 73: Part 9 - System Maintenance

    Part 9 – System Maintenance General The Q46H/62 Free Chlorine 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 74: Ensor Acid Cleaning

    Q46H/62 Free Chlorine System Part 9 – Sensor Maintenance Even if no buildup is apparent on the membrane, it should be changed on a regular schedule. The recommended membrane change interval is every 3 months. For high purity water applications, this can probably be extended if desired, but a more frequent changing interval is a small price to pay for avoiding membrane failure at the wrong time.

  • Page 75: Q22P Sensor Cleaning

    Q46H/62 Free Chlorine System Part 9 – Sensor Maintenance 3. Fill the beaker with distilled water to the level sufficient to submerge both the tip and the silver coil. Do not allow the connector at the back of the sensor to be submerged.

  • Page 76: Solution

    Q46H/62 Free Chlorine System Part 9 – Sensor Maintenance Replacing the Saltbridge and Reference Buffer Solution 1. Hold the sensor with the process electrode pointing up. Place a cloth or towel around the saltbridge. Turn the saltbridge counterclockwise (by hand) to loosen and remove the saltbridge.

  • Page 77: Low Cell Maintenance

    Q46H/62 Free Chlorine System Part 9 – Sensor Maintenance Flow Cell Maintenance The maintenance on the flow cell is simple cleaning. The flow cell is clear to make examination of the condition of the sensor easier without interfering with operations. The flow cell may be cleaned by wiping or by washing with detergents or dilute acids.

  • Page 78: Part 10 - Troubleshooting

    Part 10 – Troubleshooting 10.1 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 79 Q46H/62 Free Chlorine System Part 10 – Troubleshooting 6. Check for ground loops. Although the membrane sensor is electrically isolated from the process water, high frequency sources of electrical noise may still cause erratic behavior in extreme conditions. If readings are very erratic after wiring has been checked, check for a possible AC ground loop by temporarily disconnecting feed and drain lines from the flow cell while there is still water on the inside.

  • Page 80: Nalyzer Tests

    Q46H/62 Free Chlorine System Part 10 – Troubleshooting 10.3 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 analog outputs and relays with a DMM.

  • Page 81: Isplay Essages

    Q46H/62 Free Chlorine System Part 10 – Troubleshooting 10.4 Display Messages The Q46 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 82 Q46H/62 Free Chlorine System Part 10 – Troubleshooting MESSAGE DESCRIPTION POSSIBLE CORRECTION Temp Low The temperature reading is < -10 ºC Same as “Temp High” above. TC Error TC may be open or shorted. Check sensor wiring and perform RTD test as described in sensor manual.

  • Page 83: Ensor Tests

    Q46H/62 Free Chlorine System Part 10 – Troubleshooting 10.5 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 chlorine sensors can be tested with a digital voltmeter (DVM) to determine if a major sensor problem exists.

  • Page 84: Figure 31 - Pt100 Rtd Table

    Q46H/62 Free Chlorine System Part 10 – 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 31 - 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 85 Q46H/62 Free Chlorine System Part 10 – Troubleshooting 10.6 Troubleshooting (Q22P Sensor) The first step in resolving any measurement problem is to determine whether the trouble lies in the sensor or the transmitter. Since measurement problems can often be traced to dirty sensor electrode glass and/or saltbridge, cleaning the sensor using the method outlined in Section 9 should always be the first step in any troubleshooting.

  • Page 86: Spare Parts

    Q46H/62 Free Chlorine System Part 10 – Troubleshooting Spare Parts Part No. Description 01-0306 Power supply circuit board assembly 00-0066 Chlorine sensor, flow type 02-0016 Sensing element body, (for #00-0066) 03-0029 Sensor interconnect cable with connector, 25 ft. 45-0007 Electrolyte chamber 48-0001 Membrane holder, type 316 stainless steel 45-0010...

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