TPS miniCHEM-pH Handbook
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TPS miniCHEM-pH Handbook

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Congratulations !
Your new miniCHEM-pH monitor is the latest in simple, reliable process
monitoring instrumentation. With correct operation and maintenance, your
miniCHEM-pH will give you many years of reliable service.
The miniCHEM-pH is a breeze to operate. This manual has been designed to
help you get started, and also contains some handy application tips. If at any
stage you require assistance, please contact either your local TPS representative
or the TPS factory in Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections have also
been included to enable you to find the information you need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and controls of
the miniCHEM-pH. It also contains a full listing of all of the items that you
should have received with the unit. Please take the time to read this section, as
it explains some of items that are mentioned in subsequent sections.
3. Main Section
The main section of the handbook provides complete details of the
miniCHEM-pH, including operating modes, calibration, troubleshooting,
specifications, and warranty terms.
4. Appendices
Appendices containing background information and application notes are
provided at the back of this manual.
miniCHEM-pH
Process Monitor
Version
: 2.11
Date
: 10/09/2002
Author
: MS

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Summary of Contents for TPS miniCHEM-pH

  • Page 1 The introduction has a diagram and explanation of the display and controls of the miniCHEM-pH. It also contains a full listing of all of the items that you should have received with the unit. Please take the time to read this section, as it explains some of items that are mentioned in subsequent sections.
  • Page 2 Page 2 TPS Pty Ltd ABN 30 009 773 371 4 Jamberoo Street Springwood, Brisbane, Australia, 4127 Phone : (07) 32 900 400 International : 61 7 32 900 400 : (07) 3808 4871 International : 61 7 3808 4871 Email : tps@tps.com.au...

  • Page 3: Table Of Contents

    Page 3 Contents Introduction .....................4 1.1 miniCHEM-pH Illustration................4 1.2 Unpacking Information ..................6 1.3 Specifications....................7 Operating Modes ..................8 Installation and Set-up ................9 3.1 Connection and Configuration Diagram ............9 3.2 Mounting the Enclosure ................. 10 3.3 Mounting the Sensors..................10 3.4 Terminal Connections ..................

  • Page 4: Introduction

    Page 4 1. Introduction 1.1 miniCHEM-pH Illustration...
  • Page 5 The Function Switch is used to select the mode of operation. See section 2. ± Display Window The miniCHEM-pH has a large, easy to read LCD display. The units of measurement are clearly shown in the window beneath the display. Æ...

  • Page 6: Unpacking Information

    Page 6 1.2 Unpacking Information Before using your new miniCHEM-pH, please check that the following accessories have been included: Part No 1. miniCHEM-pH Process Monitor......111140 2. pH6.88 Buffer, 200mL .......... 121306 3. pH4.00 Buffer, 200mL .......... 121381 4. miniCHEM-pH Handbook ........130050 Options that may have been ordered with your miniCHEM-pH: Dip mounted pH and ATC Sensors, and submersible assembly…...

  • Page 7: Specifications

    Page 7 1.3 Specifications Range .....................0 to 14.00 pH Resolution ....................0.01 pH Accuracy ....................±0.01 pH Linearity....................±0.01 pH Repeatability..................±0.01 pH Ambient Drift ............. <0.01 pH per 10 C change Long term drift ................<0.1% per year Ω Input Impedance ................>3 x 10 Asymmetry Range.................

  • Page 8: Operating Modes

    : Switch to MANUAL to manually dose acid or base when the optional relay output is fitted. The relay output will be activated for as long as the miniCHEM-pH is in this mode, regardless of the pH reading. See section 7.

  • Page 9: Installation And Set-Up

    Page 9 3. Installation and Set-up 3.1 Connection and Configuration Diagram The diagram below is provided as a reference for the terminal connections, configuration jumpers and user-adjustable trimmers that are discussed throughout this section.

  • Page 10: Mounting The Enclosure

    Page 10 3.2 Mounting the Enclosure The miniCHEM-pH can be wall-mounted with 3 screws. Two mounting points are located underneath the terminal cover, and are positioned so that they do not affect the waterproofing of the enclosure. The third mounting point is centrally located near the top of the rear of the enclosure, and has been designed to hook over a screw-head.

  • Page 11: Terminal Connections

    Page 11 3.4 Terminal Connections Note: The power connections detailed below are for normal mains power. Refer to section 11.3 for power wiring details when the 12V DC power option is fitted. Terminal No. Connection Colour 12K ATC Sensor * Black 12K ATC Sensor Common * Clear...

  • Page 12: Setting The Control Limit

    Page 12 3.5 Setting the Control Limit The control limit can be set over the full scale of the miniCHEM-pH, as a “too high” or a “too low” trip point. The hysteresis around this set point can be also be adjusted, if necessary.
  • Page 13 Turning the HYSTERESIS clockwise increases the hysteresis and turning it anti-clockwise decreases the hysteresis. TPS DOES NOT recommend that this setting be altered, unless it is absolutely necessary. The HYSTERESIS trimmer should only be adjusted a little at time. The process being controlled should then be closely monitored over a time to ensure that the desired control is being achieved.

  • Page 14: Selecting Current Or Voltage Output

    The jumper settings for 0 to 1V DC output are: Note that the spare jumper has been fitted to a spare Current/Voltage Output jumper pin. This is a safe place to keep it, in case the miniCHEM-pH needs to be reset to current output in the future.

  • Page 15: Calibrating The 4 To 20Ma Output

    4mA and 20mA points in case this requires adjustment in the field. Only a limited amount of adjustment is available, as the miniCHEM-pH is designed for 4 to 20mA output for the full scale of the instrument.

  • Page 16: Calibration

    1. When the reading has stabilised, adjust the ZERO control until the display shows the value of the buffer. The pH6.88 buffer supplied by TPS lists the pH value of the buffer at various temperatures. 2. Rinse the pH and ATC sensors in distilled water and blot them dry.

  • Page 17: Calibration Notes

    4. When the reading has stabilised, adjust the SPAN control until the display shows the value of the buffer. The pH4.00 buffer supplied by TPS lists the pH value of the buffer at various temperatures.

  • Page 18: Process Monitoring

    Page 18 5. Process Monitoring Once the miniCHEM-pH has been installed, connected and calibrated, it can be used for continuous monitoring. To monitor the process, WITHOUT any control or alarm functions switch the function switch to STANDBY. 6. Automatic Dosing For Automatic Alarming or Control, switch the function switch to AUTO to enable the Alarm LED and the (optional) relay output.

  • Page 19: Troubleshooting

    2. Mains power input Check connections (see section incorrectly connected. 3.4). 3. Instrument is faulty. Return to TPS for repair. Alarm LED or 1. Limit not set correctly for Set the Lo/Hi Output jumpers (optional) relay “too high” or “too low”...

  • Page 20: Ph Troubleshooting

    Page 20 9.2 pH Troubleshooting Symptom Possible Causes Remedy Asymmetry (Zero) 1. Reference junction blocked. Clean reference junction, as per calibration fails instructions supplied with the (insufficient range electrode. with ZERO 2. Reference electrolyte Flush with distilled water and contaminated. replace electrolyte.

  • Page 21: Warranty

    TPS Pty. Ltd. has a fine reputation for prompt and efficient service. In just a few days, our factory service engineers and technicians will examine and repair your equipment to your full satisfaction.
  • Page 22 Page 22 Please check that the following is enclosed with your equipment: • Your Name and daytime phone number. • Your company name, ORDER number, and return street address. • A description of the fault. (Please be SPECIFIC.) (Note: "Please Repair" does NOT describe a fault.) Your equipment will be repaired and returned to you by air express where possible.

  • Page 23: Appendices

    11.2 Determining if an instrument or electrode is faulty The following test can be performed to help determine if the miniCHEM-pH or the pH electrode is faulty. 1. Disconnect the pH electrode.

  • Page 24: Terminal Connections When 12V Dc Option Is Fitted

    Page 24 11.3 Terminal connections when 12V DC option is fitted Terminal No. Connection Colour 12K ATC Sensor * Black 12K ATC Sensor * Clear Solution Guard Green of ATC Sensor Solution guard rod, if no ATC Sensor is installed. No Connection pH Reference Black...

  • Page 25: Relay Output Wiring Examples For Mains Powered Units

    Page 25 11.4 Relay Output Wiring Examples for mains powered units The diagrams below provide some examples of wiring the (optional) relay output for standard mains powered miniCHEM-pH units.

  • Page 26: Relay Output Wiring Examples For 12V Dc Powered Units

    Page 26 11.5 Relay Output Wiring Examples for 12V DC powered units The diagrams below provide some examples of wiring the (optional) relay output for miniCHEM-pH units with the 12V DC power option.

  • Page 27: Drilling Template

    Page 27 11.6 Drilling Template The template below is for the three mounting positions for the miniCHEM enclosure. This template is actual size, and can be photocopied or removed as required.
  • Page 28 Page 28...

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