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Analytical Technology Q46P Manual

Ph monitor
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Model Q46P
pH Monitor
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
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 Q46P pH Monitor 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 products 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

    1.1 General ..........4 5.11 Keys ..........39 1.2 Features .......... 5 5.12 Display ........... 39 1.3 Q46P System Specifications .... 6 5.2 Software ......... 41 1.4 Q46P Performance Specifications 5.21 Software Navigation ...... 41 (Common to all variations)....7 5.22 Measure Menu [MEASURE] ...
  • Page 4 Q25P ................. 30 IGURE ABLE ESCRIPTION ODEL 22 - D Q25P ..........31 IGURE ETACHABLE INGLE HIELDED ABLE ODEL 23 - Q46P S ................. 32 IGURE ENSOR ONNECTIONS 24 - S ................. 33 IGURE ENSOR ABLE REPARATION 25 - J ..............34...

  • Page 5: Part 1 - Introduction

    PID control and one of the relays may be configured to provide a remote trouble indication. The Q46P is available with a few options to expand the capabilities of the monitor. Users may select either a third analog 4-20 mA output or an expansion card that provides three additional low voltage SPST relays.

  • Page 6: Features

    Q46P pH System Part 1 – Introduction Features · Standard Q46P Analyzers have fully isolated inputs and outputs. Analog outputs are additionally completely isolated from each other. · Available in either 90-260 VAC or 12-24 VDC power supply systems. All features remain the same in both variations.

  • Page 7: Q46P System Specifications

    Q46P pH System Part 1 – Introduction Q46P System Specifications Displayed Parameters Main input, 0.00 to 14.00 pH Sensor temperature, -10.0 to 110.0 °C (14 to 230ºF) Loop current, 4.00 to 20.00 mA Sensor slope/offset Model number and software version...

  • Page 8: Q46P Performance Specifications (Common To All Variations)

    500 Ohms for each output. Outputs ground isolated and isolated from each other. An additional 3 analog option is available. Q46P Performance Specifications (Common to all variations) Accuracy 0.1% of span or better (± 0.01 pH) Repeatability 0.1% of span or better (± 0.01 pH) Sensitivity 0.05% of span (±...

  • Page 9: General - Q25P Ph Sensor

    Part 1 – Introduction General – Q25P pH Sensor Model Q25P “differential” pH sensors are the most commonly used sensors with the Q46P monitor. The differential design utilizes a second glass measuring electrode contained in an internal buffer as the reference element. This eliminates the need for a silver/silver chloride reference used in conventional pH sensor designs.

  • Page 10: Q25P Sensor Specifications

    Q46P pH System Part 1 – Introduction Q25P Sensor Specifications Measuring Range 0 to 14.00 pH Sensitivity 0.01 pH Stability 0.02 pH per 24 hours, non-cumulative Wetted Materials PEEK, ceramic, titanium, glass, Viton, EDPM (optional: 316 stainless steel body) Temperature Compensation...
  • Page 11 Q46P pH System Part 1 – Introduction 1.8 Important Sensor Notes · The glass electrode must be wetted at all times to ensure proper functionality. Q25P sensors are shipped with a fluid-filled cap over the electrode to enable immediate use (remove cap before installing, save for storage and shipping purposes).

  • Page 12: Part 2 - Analyzer Mounting

    Part 2 – Analyzer Mounting General All Q46 Series instruments provide for mounting flexibility. A bracket is included 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 13: Wall Or Pipe Mount

    Q46P pH System Part 2 – Mounting Wall or Pipe Mount A PVC mounting bracket with attachment screws is supplied with each transmitter. 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 14: Figure 3 - Wall Mountingd

    Q46P pH System Part 2 – Mounting Note: Analyzer shown with optional Profibus Connector mounted to side of enclosure. Figure 3 - Wall Mounting Diagram Figure 4 - Pipe Mounting Diagram O&M Manual Rev-F (8/17)

  • Page 15: Panel Mounting

    Q46P pH System Part 2 – Mounting Panel Mounting Panel mounting uses the panel mounting flange molded into the rear section of the enclosure. Figure 5 provides dimensions for the panel cutout required for mounting. The panel mounting bracket kit must be ordered separately (part number 05- 0094).

  • Page 16: Part 3 - Sensor/Flowcell Mounting

    Part 3 – Sensor/Flowcell Mounting General The Q25P pH Sensor mounting options include flow-through, submersion, insertion (special hardware required), or sanitary mount depending on the type of sensor purchased. Q25P Differential pH Sensors are available in 4 different versions as shown in Figure 6.

  • Page 17: Flow Tee Mounting

    Q46P pH System Part 3 – Sensor/Flowcell Mounting Flow Tee Mounting Convertible sensors may be used in a 1” flow tee as shown in Figure 7. The flow tee is a modified pipe fitting that accommodates the pipe thread on the front of the sensor.

  • Page 18: Union Mounting

    Q46P pH System Part 3 – Sensor/Flowcell Mounting 3.3 Union Mounting For mounting the sensor in larger pipe and allowing for easy sensor removal, a 1 ½” or 2” union mount adapter system is available. This arrangement allows connection of the sensor to pipe sizes up to 2 inches (using adapters if necessary) while allowing easy removal without twisting sensor wires.

  • Page 19: Submersion Mounting

    Q46P pH System Part 3 – Sensor/Flowcell Mounting 3.4 Submersion Mounting When using this sensor for submersion applications, mount the sensor to the end of a 1” mounting pipe using a 1” coupling. ATI’s (00-0628) mounting assembly shown in Figure 9 is available for submersible applications. This assembly is designed to mount to standard handrails and facilitates insertion and removal of the sensor.

  • Page 20: Insertion Mounting

    Q46P pH System Part 3 – Sensor/Flowcell Mounting 3.5 Insertion Mounting Special insertion mounting hardware is available for applications requiring the removal of the sensor from a process line or tank without shutting off the sample flow in the line. Figure 10 & Figure 11 show typical insertion assemblies.
  • Page 21 Q46P pH System Part 3 – Sensor/Flowcell Mounting Figure 11 - CPVC Sensor Insertion Mount O&M Manual Rev-F (8/17)

  • Page 22: Conventional Ph Sensors

    Figure 12 below show the dimensions of two pH sensors frequently used with the Q46P. The 63-0013 sensor is suitable for use with either a pipe tee adapter or a special clear acrylic sealed flowcell.

  • Page 23: Sealed Flowcell

    Q46P pH System Part 3 – Sensor/Flowcell Mounting 3.61 Sealed Flowcell For applications where a flowcell is desired, a sealed flowcell (00-1527) shown in Figure 14 is available. This flowcell is used only with sensor (63-0005) or (63- 0013) and may be used for sample pressures up to 75 PSIG. The sample flow should be controlled to 300-800 cc/min.

  • Page 24: Flow Tee Adapter

    Q46P pH System Part 3 – Sensor/Flowcell Mounting 3.62 Flow Tee Adapter When using the 63-0013 sensor in a flow application, a 1” or ¾” pipe tee adapter is required. Figure 15 shows a detail of that arrangement. Figure 15 - Twist-Lock Flow Tee O&M Manual...

  • Page 25: Lock-N-Load System

    Q46P pH System Part 3 – Sensor/Flowcell Mounting Lock-n-Load System A special sensor/flowcell system is available that allows insertion and removal of a pH sensor under flow conditions. Called a Lock-n-Load system, this assembly uses a 2” flow tee and special sensor holder that retracts the sensor from a flowing sample for maintenance and cleaning.

  • Page 26: 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 27: Power Connection

    Q46P pH 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 28 Q46P pH System Part 4 – Electrical Installation Figure 17 – Q46 Connections 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 29: Relay Connection

    Q46P pH 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 30: Optional Output Or Relay Connections

    Q46P pH System Part 4 – Electrical Installation Optional Output or Relay Connections TB2, is used to connect to the optional 3-relay card (Figure 19) OR the optional third analog output Out#3, (Figure 20). The Q46 can be configured for only one of these optional features, and the hardware for either option must be factory installed.

  • Page 31: Sensor Wiring

    Q46P pH 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.

  • Page 32: Figure 22 - Detachables

    Q46P pH System Part 4 – Electrical Installation RED - DRIVE ELECTRODE BLACK - COMMON (GROUND) GREEN - DRIVE ELECTRODE ORANGE - TEMPERATURE COMPENSATION WHITE - SENSE ELECTRODE BLUE - NOT USED CABLE SHIELD - EARTH GROUND Figure 22 - Detachable Single Shielded Cable, Model Q25P DANGER: DO NOT connect sensor cable to power lines.
  • Page 33 NOTE: If sensor is experiencing Low-Slope or Low-Output conditions, due to poor Earth Ground Connections, move the Shield connection from P/S Board to alternate location on lid, where indicated with an “S” Figure 23 - Q46P Sensor Connections O&M Manual Rev-F (8/17)

  • Page 34: Direct Sensor Connection

    Q46P pH System Part 4 – Electrical Installation Direct Sensor Connection Sensor connections are made in accordance with Figure 23. 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.

  • Page 35: Junction Box Connection

    Q46P pH System Part 4 – Electrical Installation Junction Box Connection For installations where the sensor is to be located more than 30 feet from the monitor (max. 3000 feet), a junction box must be used. The junction box is...

  • Page 36: Combination Electrode Connection

    Part 4 – Electrical Installation Combination Electrode Connection The Q46P may also be used with non-amplified simple combination electrodes (see Figure 26). Note that a wire jumper must be installed from Terminal 3 to Terminal 8. The user must also select Sensor Type 2 within the Config Menu (see Section 5.24).
  • Page 37 Q46P pH System Part 4 – Electrical Installation Flow pH Probe (63-0013) Submersible pH Probe (63-0009) Connect ATI sensors listed above as follows: Terminal 1 – Center clear (coax) 3 – Shield (coax) 7 – Red (Pt100) 8 – White and Green or Blue (Pt100) Terminals 3 &...

  • Page 38: External Preamplifier

    Moisture entering the enclosure through a conduit will cause failure of the amplifier circuit. Use of this preamp. allows the Q46P to be located up to 300 metres from the sensor/preamp. installation location. Wiring for that system is shown below.

  • Page 39: Part 5 - Configuration

    Part 5 – 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 40: Keys

    Q46P pH System Part 5 – Configuration 5.11 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 41 Q46P pH System Part 5 – 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 42: Software

    MEASURE display line. Software The software of the Q46P 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 43 Q46P pH System Part 5 – 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 44: Figure 30 - Software Map

    Q46P pH System Part 5 – Configuration MENU MEASURE CONFIG CONTROL DIAG SECTIONS Temperature Entry Lock Cal pH Set Hold PID 0% #1 PID 100% #1 Fault List Cal Temp Set Delay PID % Output Sim Out PID Setpoint #1...

  • Page 45: Measure Menu [Measure]

    Q46P pH System Part 5 – Configuration 5.22 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 46: Calibration Menu [Cal]

    Q46P pH System Part 5 – Configuration Offset = 0.0 mV Sensor output current at a zero ppm input. This value updates after a zero-calibration has been performed. Useful for resolving sensor problems. Q46P v4.01 Transmitter software version number. Toff 0.9mn...

  • Page 47: Configuration Menu [Config]

    Press ENTER to initiate user entry mode and the first digit will flash. Use arrow keys to modify value. See the last page of this manual for the Q46P lock/unlock code. Press ENTER to toggle lock setting once code is correct.
  • Page 48 Q46P pH System Part 5 – Configuration Main Display This function allows the user to change the measurement in the primary display area. The user may select between pH, sensor temperature, or output current. Using this function, the user may choose to put temperature in the main display area and pH on the secondary, lower line of the display.

  • Page 49: Figure 31 - Automatic P H B

    This is a multiple variable function that allows the user to choose which pH buffer sets that will be utilized in the 2- point calibration mode. The Q46P contains 3 sets of built-in buffer tables with compensation values ranging from 0 to 95°C.
  • Page 50 Q46P pH System Part 5 – Configuration Table 3 4.65 pH 6.79 pH 9.23 pH ºC °C °C 4.67 6.89 9.48 4.66 6.84 9.37 4.65 6.80 9.27 4.65 6.78 9.18 4.66 6.76 9.09 4.68 6.76 9.00 4.70 6.76 8.92 4.72 6.76...
  • Page 51 Q46P pH System Part 5 – Configuration Rly A Mode Relay A can be used in three different ways: as a setpoint control, as a fail alarm, or as a HI-LO alarm band. The three settings for Rly A Mode are CON, FAIL and AL.
  • Page 52 Q46P pH System Part 5 – Configuration Relay C Mode Relay B and C can be used in two ways: as a setpoint control, or as an alarm. The two settings for Relay B Mode are CON and FAIL. The CON setting enables normal setpoint operation for Relay B/C.

  • Page 53: Control Menu [Control]

    Q46P pH System Part 5 – Configuration 5.25 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 54 Q46P pH System Part 5 – 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 55 Q46P pH System Part 5 – Configuration *Set 4 mA #2 *Set 20 mA #2 [temp/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) or pH. The values stored for the 4 mA point may be higher or lower than the value stored for the 20 mA point.
  • Page 56 Q46P pH System Part 5 – Configuration *A Hysteresis This function establishes the hysteresis, or “deadband”, for Relay A. Hysteresis is most often used to control relay chattering; however, it may also be used in control schemes to separate the ON/OFF trip points of the relay.

  • Page 57: Figure 33 - Control Relay

    Q46P pH System Part 5 – Configuration See Figure 33 below for a visual description of a typical control relay application. When value falls to ≤ 8.95 pH, relay When value rises to ≥ 9.00 pH, relay opens. closes. Setpoint: 9.00 pH...

  • Page 58: Figure 32 - A

    Q46P pH System Part 5 – Configuration If Relay A Mode is set to Alarm Mode, AL, then the following *Setpnt A-HI settings will appear in the Config Menu list automatically. In *Hyst A-HI this mode, two setpoints can be selected on the same relay, *Delay A-HI to create an alarm band.
  • Page 59 Q46P pH System Part 5 – Configuration *B Setpoint If Relay B Mode is set to CON or FAIL, then Relay B will *B Hysteresis function identically to Relay A CON or FAIL modes *B Delay described earlier. Relay B settings appear in the CONFIG *B Phasing menu list automatically.

  • Page 60: Diagnostics Menu [Diag]

    Q46P pH System Part 5 – Configuration If Relay C Mode is set to CON (see Relay C Mode), then C Setpoint Relay C will function identically to Relay A. Relay C settings C Hysteresis appear in the CONFIG menu list automatically.
  • Page 61 Q46P pH System Part 5 – Configuration Fault List The Fault List screen is a read-only screen that allows the user to display the cause of the highest priority failure. The screen indicates the number of faults present in the system and a message detailing the highest priority fault present.
  • Page 62 Q46P pH System Part 5 – Configuration Sim Out The Sim Out function allows the user to simulate the pH level of the instrument in the user selected display range. The user enters a pH value directly onto the screen, and the output responds as if it were actually receiving the signal from the sensor.
  • Page 63 Q46P pH System Part 5 – Configuration Press ENTER to initiate user entry mode, and the entire value will flash. Use the UP arrow key to modify desired value; range of value is 0-9999 seconds. Press ENTER to store the new value...
  • Page 64 Q46P pH System Part 5 – 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. *Failsafe This function allows the user to set the optional system relays to a failsafe condition.

  • Page 65: Part 6 - Calibration

    Part 6 – Calibration Overview and Methods Since the sensor slope (mV/pH output) will degrade over time, the instrument must be calibrated periodically to maintain a high degree of measurement accuracy. Frequency of calibration must be determined by the application. High temperature applications or applications involving extreme pH operating conditions may require more frequent calibration than those that operate at more neutral pH levels and ambient level temperatures.

  • Page 66: Sensor Offset

    Q46P pH System Part 6 – Calibration 6.12 Sensor Offset Sensor offset is a number that indicates sensor output (expressed in mV) in 7.00 pH buffer at 25 ºC. Ideally, the sensor will output 0 mV under these conditions. A sensor offset reading of +10 mV indicates that the sensor will output +10 mV when placed into a perfect 7.00 pH buffer at 25 ºC.

  • Page 67: Performing A 2-Point Calibration

    Q46P pH System Part 6 – Calibration Performing a 2-Point Calibration The 2-point calibration method utilizes an automatic buffer recognition and compensation system. For this system to operate properly, the user must first configure the proper buffers in the Set Buffers screen (see Section 5.24). If the buffers are not present in this menu, the user can override the automatic values and enter arbitrary values.

  • Page 68: Performing A 1-Point Calibration

    Q46P pH System Part 6 – Calibration 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. Any value between 0.00 and 14.00 pH can be entered. After adjusting this value, or to accept the automatic value, press ENTER.
  • Page 69 Q46P pH System Part 6 – Calibration Procedure 1. Determine whether the calibration will be done on-line or with the sensor removed and placed into a buffer. If the sensor is removed from the application, rinse and clean if necessary.

  • Page 70: Temperature Calibration

    Q46P pH System Part 6 – Calibration Temperature Calibration The temperature input is factory calibrated for the highest accuracy. Temperature calibration is not recommended unless the installation involves long cable lengths. For example, at 50 feet, readings may be off ± 0.2°C.

  • Page 71: Part 7 - Pid Controller Details

    Part 7 – 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 72 Q46P pH System Part 7– PID Controller 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 35 - Q45H 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 73: Classical Pid Tuning

    Q46P pH System Part 7– PID Controller 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 74: Manual Pid Override Control

    Q46P pH System Part 7– PID Controller 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 75 Q46P pH System Part 7– PID Controller 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 76: Part 8 - Maintenance And Troubleshooting

    Part 8 – Maintenance and Troubleshooting System Checks 1. If the FAIL icon is flashing on the display, check the Fault List to determine the cause of the failure. To access the Fault List, press the MENU/ESC key until the DIAG menu appears. Then press the UP arrow key until the Fault List appears.

  • Page 77: Display Messages

    Q46P pH System Part 8 – Maintenance and Troubleshooting 2. With a DMM, measure the DC voltage from the white sensor lead connection to the black sensor lead connection. With the positive DMM lead on the white wire, the meter should read between -4.5 and -5.5 VDC.
  • Page 78 Q46P pH System Part 8 – Maintenance and Troubleshooting The following messages will appear as prompts: MESSAGE DESCRIPTION POSSIBLE CORRECTION Max is 200 Entry failed, maximum value Reduce value to ≤ 200 allowed is 200. Min is 200 Entry failed, minimum value Increase value to ≥...
  • Page 79 Q46P pH System Part 8 – Maintenance and Troubleshooting The following messages will appear as items on the Fault List: MESSAGE DESCRIPTION POSSIBLE CORRECTION Sensor The raw signal from the sensor is Check wiring connections to sensor. High too high.
  • Page 80 Q46P pH System Part 8 – Maintenance and Troubleshooting MESSAGE DESCRIPTION POSSIBLE CORRECTION pH Cal Fail Failure of pH calibration. Clean sensor, get fresh cal solutions, regenerate sensor (if necessary) and redo calibration. If still failure, sensor slope may be less than 80% or offset may be out of range.

  • Page 81: Cleaning The Sensor

    Q46P pH System Part 8 – Maintenance and Troubleshooting Cleaning the Sensor Keep the sensor as clean as possible for optimum measurement accuracy - this includes both the saltbridge and the measuring electrode glass. Frequency of cleaning depends upon the process solution.

  • Page 82: Replacing The Saltbridge And Reference Buffer Solution

    Q46P pH System Part 8 – Maintenance and Troubleshooting 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 83: Troubleshooting

    Q46P pH System Part 8 – Maintenance and Troubleshooting 8.6 Troubleshooting 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 8.4 should always be the first step in...
  • Page 84 Q46P pH System Part 8 – Maintenance and Troubleshooting 6. Connect the multimeter’s positive (+) lead to the red wire and its negative (-) lead to the green wire. With the sensor in the pH 7 buffer at approximately 20-30 ºC, measure the DC millivolts. The sensor offset reading should be between –50 and +50 mV.

  • Page 85: Spare Parts

    Part No. Description 07-0338 Q46P pH Monitor, 100-240 VAC 07-0339 Q46P pH monitor, 12-24 VDC 07-0340 Q46P pH monitor with Profibus, 100-240 VAC 07-0341 Q46P pH monitor with Profibus, 12-24 VDC 03-0397 Q46P Front Lid Assembly 03-0407 Q46 P/S Assy, 90-260VAC...
  • Page 86 Q25 pH Sensors & Sensor Parts 07-0050 Q25P1-1-1 pH Sensor, 15 ft. cable 07-0051 Q25P2-1-1 pH Sensor, 15 ft. cable 07-0062 Q25P1-1-2 pH Sensor, 30 ft. cable 07-0063 Q25P2-1-2 pH Sensor, 30 ft. cable 07-0052 Q25P3 Antimony pH Sensor, 15 ft. cable 07-0077 Q25P1-3-1 SS pH Sensor, 15 ft.

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