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Analytical Technology Q46H/79PR Manual

Total chlorine measurement system
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Model Q46H/79PR
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
Total 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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Summary of Contents for Analytical Technology Q46H/79PR

  • Page 1: Measurement System

    Model Q46H/79PR Total Chlorine 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 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

    Standard System ........5 7.11 Chlorine Zero Cal ........59 Features ............. 9 7.12 Chlorine Span Cal ........60 Q46H/79PR System Specifications ..11 Temperature Calibration ......62 Q46H-79PR Performance Specifications .13 pH Calibration..........63 7.31 Two-Point pH Cal ........64 PART 2 – ANALYZER MOUNTING ....14 7.32...
  • Page 4 Q46H/79PR Chlorine Manual Table Of Figures Table of Figures 1 - T ..................6 IGURE YPICAL ONITORING YSTEM 2 - C ........7 IGURE HLORINE YSTEM W PTIONAL P AYONET TYLE ENSOR 3 - S ............8 IGURE EALED LOWCELL...

  • Page 5: Part 1 - Introduction

    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 ranging from 0 to 55°C. The Q46H/79PR Total Chlorine Measurement System is well suited for potable water systems, activated carbon filter break-through detection, and for monitoring wastewater treatment effluents.

  • Page 6: Figure 1 - Typical Monitoring

    Q46H/79PR Chlorine Manual art 1 – Introduction Note that standard 25 foot sensor cables for both chlorine and optional pH sensors can be cut to a shorter length. Cutting the cables will not affect performance, and elimination of extra cable can sometimes eliminate electrical noise pickup through the cables.

  • Page 7: Figure 2 - Chlorine System W

    Q46H/79PR Chlorine Manual art 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.

  • Page 8: Figure 3 - Sealed Flowcell

    Q46H/79PR Chlorine Manual art 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

    · Digital communication options for Profibus-DP, Modbus RTU. More versions pending. See Q46 Digital Communications Manual for Specifications. · Optional pH sensor feature enables active pH measurement with the Q46H/79PR monitor. The pH reading can also be sent to one of the analog outputs for complete pH + chlorine monitoring.
  • Page 10 Q46H/79PR Chlorine Manual art 1 – Introduction · Large, high contrast, custom Super-Twist display provides excellent readability even in low light conditions. The secondary line of display utilizes 5x7 dot matrix characters for clear message display two of four measured parameters may be on the display simultaneously.

  • Page 11: Q46H/79Pr System Specifications

    Q46H/79PR Chlorine Manual art 1 – Introduction Q46H/79PR System Specifications Displayed Parameters Main input, 0.1 ppb (0.0001 ppm) to 200.0 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 Loop current, 4.00 to 20.00 mA...
  • Page 12 Q46H/79PR Chlorine Manual art 1 – Introduction Temperature Input Pt100 RTD with automatic compensation Sensor 3-electrode amperometric membrane sensor for direct measurement of chlorine Sensor Materials Sensor Cable 25 ft. (7.5 meter) cable with 6-pin plug. Max. Sensor-to-Analyzer Distance 100 feet (30.5 meters), with junction box Optional pH Input 0-14 pH corresponding to approx.

  • Page 13: Q46H-79Pr Performance Specifications

    Q46H/79PR Chlorine Manual art 1 – Introduction Q46H-79PR Performance Specifications Accuracy 1.0% of selected range or 0.05 PPM Repeatability 0.5% of selected range or 0.02 PPM Sensitivity 0.1% 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/79PR Chlorine Manual art 2 – Analyzer Mounting Wall or Pipe Mount A PVC mounting bracket with attachment screws is supplied with each transmitter (see Figure 5 for 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 using the four outer mounting holes in the bracket.

  • Page 16: Figure 6 - Wall Mountingd

    Q46H/79PR Chlorine Manual art 2 – Analyzer Mounting Figure 6 - Wall Mounting Diagram Figure 7 - Pipe Mounting Diagram O&M Manual Rev-E (5/17)

  • Page 17: Panel Mounting

    Q46H/79PR Chlorine Manual art 2 – Analyzer Mounting Panel Mounting Panel mounting uses the panel mounting flange molded into the rear section of the enclosure. Figure 8 provides 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 Chlorine sensors are best used in a constant-head overflow chamber because variations in sample flow rate and pressure can cause unstable readings. When monitoring low concentrations (below 0.5 PPM), this method should always be used.

  • Page 19: Sealed Flowcell

    Q46H/79PR Chlorine Manual art 3 – Sensor/Flowcell Mounting Once mounted, inlet and drain connections must be made. The flow cell contains a 1/8" MNPT inlet connection and a 3/8" 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/79PR Chlorine Manual art 3 – Sensor/Flowcell Mounting Figure 11 - Sealed pH Flowcell Details O&M Manual Rev-E (5/17)

  • Page 21: Submersion Mounting

    Q46H/79PR Chlorine Manual art 3 – Sensor/Flowcell Mounting Submersion Mounting Some applications are much easier done using the submersible sensor. This method can sometimes be used where flow is reasonably constant, and hydraulic head does not vary appreciably. Chlorine sensors can never be used in completely stagnant conditions.

  • Page 22: Part 4 - Electrical Installation

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

  • Page 23: Power Connection

    The NEC recommends an impedance to ground of less than 25 ohms, and less than 5 ohms where sensitive equipment is installed. Power sources feeding sensitive instruments like the Q46H/79PR should have the lowest possible impedance to ground. Power Connection Verify the AC power supply requirement before installing.

  • Page 24: Figure 13 - Line Powerc

    Q46H/79PR Chlorine Manual art 4 – Electrical Installation Figure 13 - 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 25: Figure 14 - Optional Relay

    Q46H/79PR Chlorine Manual art 4 – Electrical Installation 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 26: Relay Board Wiring

    Q46H/79PR Chlorine Manual art 4 – Electrical Installation TB2, is used to connect to the optional 3-relay card (See Figure 15) OR the optional third analog output Out#3, (See Figure 16). The Q46 can be configured for only one of these optional features, and the hardware for either option must be factory installed.

  • Page 27: Direct Sensor Connection

    Q46H/79PR Chlorine Manual art 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 28: Sensor Wiring

    Q46H/79PR Chlorine Manual art 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.

  • Page 29: Junction Box Connection

    Q46H/79PR Chlorine Manual art 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 30: Optional Ph Sensor Input

    4 – Electrical Installation Optional pH Sensor Input The Q46H/79PR may be configured for pH sensor input in applications where the pH can vary. To utilize the feature, a pH sensor must be connected to terminals 3 and 5 as shown in Figure 18. Note that jumpers are installed at the factory between terminals 3 and 5, and terminals 6 and 9.

  • Page 31: Part 5 - Sensor Assembly

    Part 5 – Sensor Assembly Chlorine Sensor Preparation The total chlorine sensor supplied with the Q46H is shipped dry. It will not operate until it is prepared by adding electrolyte. The membrane assembly shipped on the sensor is good and should not be removed at initial start- up.

  • Page 32: Figure 21 - Submersibles

    Q46H/79PR Chlorine Manual art 5 – Sensor Assembly Figure 21 - Submersible Style Sensor Assembly Follow the procedure below to replace a membrane assembly and prepare the chlorine sensor for operation: (It will not always be necessary to replace the membrane assembly. If membrane assembly is not replaced, simply remove the vent screw, empty the electrolyte chamber, rinse thoroughly with D.I.

  • Page 33: Optional Ph Sensor

    Optional pH Sensor An optional battery powered pH sensor is available for use with the Q46H/79PR system that puts out a nominal signal of 0.3-1.5 VDC proportional to pH over a range of 0-14 pH units. The Q25P pH sensor can also be used and provides a standard 4-20 mA signal.

  • Page 34: Part 6 - Configuration

    Q46H/79PR Chlorine Manual art 5 – Sensor Assembly 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.).

  • Page 35: Keys

    Q46H/79PR Chlorine Manual art 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 36 Q46H/79PR Chlorine Manual art 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 transmitter model number and software version.

  • Page 37: Software

    MEASURE display line. Software The software of the Q46H/79PR is organized in an easy to follow menu-based system. All user settings are organized under five menu sections: Measure, Calibration [CAL], Configuration [CONFIG], Control [CONTROL] and Diagnostics [DIAG].
  • Page 38 Q46H/79PR Chlorine Manual art 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 39: Figure 23 - Software Map

    Q46H/79PR Chlorine Manual art 6 – Configuration MENU MEASURE CONFIG CONTROL DIAG SECTIONS Temperature Entry Lock Cal Cl2 Set Hold PID 0% #1 PI D 100% #1 Fault List Set Delay Cal pH PID % Output Sim Out PID Setpoint #1...

  • Page 40: Measure Menu [Measure]

    Q46H/79PR Chlorine Manual art 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 41: Calibration Menu [Cal]

    Q46H/79PR Chlorine Manual art 6 – Configuration 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. Q46H1 v 4.02 Transmitter software version number.

  • Page 42: Configuration Menu [Config]

    Q46H/79PR Chlorine Manual art 6 – Configuration measurement in some extreme situations. Therefore, this feature is provided as an adjustment Set Range This function allows the user to set the display range of the analyzer to a specific application. Once set, all output functions use this display range to establish configuration settings.
  • Page 43 Q46H/79PR Chlorine Manual art 6 – Configuration 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. The STN display provides the highest possible contrast and widest viewing angle under all conditions.
  • Page 44 Q46H/79PR Chlorine Manual art 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 45 Q46H/79PR Chlorine Manual art 6 – Configuration The AL setting allows two setpoints 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. See Figure 26 - Alarm Relay Example for further details.
  • Page 46 Q46H/79PR Chlorine Manual art 6 – Configuration Temp Units This function sets the display units for temperature measurement. Press ENTER to initiate user entry mode, and the entire value will flash. Use the UP arrow key to modify the desired display value. The choices are °F and °C.

  • Page 47: Figure 24 - Automatic P H B

    Q46H/79PR Chlorine Manual art 6 – Configuration Once the buffer set is selected, press ENTER and the message Accepted! will be displayed on the lower line. Table 1 Table 2 4.00 pH 7.00 pH 10.00 pH 4.00 pH 7.00 pH 9.18 pH...

  • Page 48: Control Menu [Control]

    Q46H/79PR Chlorine Manual art 6 – Configuration 6.25 Control Menu [CONTROL] The Control Menu contains all of the output control user settings: Set PID 0% Set PID 100% [Iout1=PID] If the PID is enabled, this function sets the minimum and maximum controller end points.
  • Page 49 Q46H/79PR Chlorine Manual art 6 – Configuration PID Int [Iout1=PID] Integral is the number of “repeats-per-minute” of the action of the controller. It is the number of times per minute that the controller acts on the input error. At a setting of 2.0 rpm, there are two repeats every minute.
  • Page 50 Q46H/79PR Chlorine Manual art 6 – Configuration Set 4 mA #2 Set 20 mA #2 [temp/chlor/pH] These functions set the second 4 mA and 20 mA current loop output points for the transmitter. The output may be set to track temperature (default), pH, or chlorine. The values stored for the 4 mA point may be higher or lower than the value stored for the 20 mA point.
  • Page 51 Q46H/79PR Chlorine Manual art 6 – Configuration 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 “Set Range”. Use the LEFT arrow key to select the first digit to be modified.

  • Page 52: Relay Example

    Q46H/79PR Chlorine Manual art 6 – Configuration See Figure 25 below for a visual description of a typical control relay application. When value rises to ≥ 1.000 ppm, relay closes. When value rises to ≥ 1.050 ppm, relay opens. 1.000 ppm 1.050 ppm...

  • Page 53: Elay E Xample

    Q46H/79PR Chlorine Manual art 6 – Configuration Figure 26 is a visual description of a typical alarm relay application. When value rises to ≥ 1.000 ppm, relay When value falls to < 1.000 ppm, relay closes, until value falls back to < 0.950 ppm.

  • Page 54: Diagnostics Menu [Diag]

    Q46H/79PR Chlorine Manual art 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...

  • Page 55: Rev-E (5/17

    Q46H/79PR Chlorine Manual art 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 56: Rev-E (5/17

    Q46H/79PR Chlorine Manual art 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 57: Rev-E (5/17

    Q46H/79PR Chlorine Manual art 6 – Configuration Fail Val #2 This function sets the value of current loop output #2 under a FAIL condition. The settings and operation are identical to Fail Out for output #1. *Fail Out #3 OPTIONAL. This function sets the fail-mode of current loop output #3 under a FAIL condition.
  • Page 58 Q46H/79PR Chlorine Manual art 6 – Configuration 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 59: Part 7 - Calibration

    Part 7 – Calibration Chlorine Calibration Once 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 60: Chlorine Span Cal

    Q46H/79PR Chlorine Manual 7 – Calibration Part unstable. The calibration data point acquisition will stop only when the data remains stable for a pre-determined amount of time. This can be overridden by pressing ENTER. If the data remains unstable for 10 minutes, the calibration will fail and the message Cal Unstable will be displayed.
  • Page 61 Q46H/79PR Chlorine Manual 7 – Calibration Part 3. Allow the system to operate undisturbed for 30-60 minutes. Assuming the water contains chlorine, 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 62: Temperature Calibration

    Q46H/79PR Chlorine Manual 7 – Calibration Part 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 63: Ph Calibration

    Q46H/79PR Chlorine Manual 7 – Calibration Part 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. See section 6.23 Calibration Menu [CAL] pH Input for more details.

  • Page 64: Two-Point Ph Cal

    Q46H/79PR Chlorine Manual 7 – Calibration Part 7.31 Two-Point pH Cal 1. Thoroughly clean the pH sensor and place it into the first pH calibration buffer, stirring is several times before letting it rest in the beaker. Allow sensor to sit in solution long enough to achieve temperature equilibrium with the pH buffer (maybe 5 minutes.) It is important that both pH buffers be fresh...

  • Page 65: One-Point Ph Cal

    Q46H/79PR Chlorine Manual 7 – Calibration Part 7.32 One-Point pH Cal 1. For this calibration method, the sensor may be removed, cleaned, and placed into a known pH buffer, or, it may be calibrated on-line against a known reference value. If the sensor is removed, thoroughly clean the pH sensor and place it into the pH calibration buffer, stirring is several times before letting it rest in the beaker.

  • Page 66: 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 67: Figure 27 - Isa (Ideal ) Pid E

    Q46H/79PR Chlorine Manual 8 – PID Controller Details Part 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 - ISA (Ideal) 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 68: Classical Pid Tuning

    Q46H/79PR Chlorine Manual 8 – PID Controller Details Part 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 processes, 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 69: Manual Pid Override Control

    Q46H/79PR Chlorine Manual 8 – PID Controller Details Part Manual PID Override Control The Q45 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 70 Q46H/79PR Chlorine Manual 8 – PID Controller Details Part 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 71: Part 9 - System Maintenance

    Part 9 – System Maintenance General The Q46H/79PR Total 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 72: Sensor Acid Cleaning

    Q46H/79PR Chlorine Manual 9 – System Maintenance Part 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 73: Q22P Sensor Cleaning

    Q46H/79PR Chlorine Manual 9 – System Maintenance Part 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 74: Replacing The Saltbridge And Reference Buffer Solution

    Q46H/79PR Chlorine Manual 9 – System Maintenance Part 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 75: Flow Cell Maintenance

    Q46H/79PR Chlorine Manual 9 – System Maintenance Part 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 76: 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 77 Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 5. If rigid conduit has been run directly to the Q46 enclosure, check for signs that moisture has followed conduit into the enclosure. 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.

  • Page 78: Analyzer Tests

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 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 79: Display Messages

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 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 80: Figure 30 - Display Messages

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part MESSAGE DESCRIPTION POSSIBLE CORRECTION Chlor Cal Fail Failure of chlorine calibration. FAIL icon will Clean sensor redo zero and span calibration. not extinguish until successful calibration If still failure, sensor slope may be less than has been performed, or 30 minutes passes 25% or greater than 250%.

  • Page 81: Sensor Tests

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 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 82: Figure 31 - Pt100 Rtd Table

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 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 83: Troubleshooting (Q22P Sensor)

    Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 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 84: Spare Parts

    Spare Parts Part No. Description 03-0444 Q46H-79PR Front Lid Assembly 07-0373 Q46H-79PR Monitor, 100-240 VAC 07-0374 Q46H-79PR Monitor, 12-24 VDC 07-0375 Q46H-79PR Monitor, 100-240 VAC with Profibus 07-0376 Q46H-79PR Monitor, 12-24 VDC with Profibus 03-0407 Q46 P/S Assy, 100-240VAC 03-0408 Q46 P/S Assy, 100-240VAC with 3 4-20mA output 03-0409...
  • Page 85 Q46H/79PR Chlorine Manual 10 – Troubleshooting Part 00-1522 Sealed Cl2 Flowcell Assy 00-1527 Sealed pH Flowcell Assy 05-0110 Sealed Cl2 Flowcell Vacuum Breaker Note: Instrument is supplied with sufficient spare parts for 6-12 months of operation. For 2 year spare parts inventory, 3 each of the items marked with an asterisk are required.

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