Eutech Instruments PH 500 User Manual

Instruction Manual

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pH 500 LCD Transmitter

2-wire pH/ORP Transmitter with Display

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68X216829

03/02 version 1

Preface

This manual serves to explain the use of the pH 500 transmitter. It functions in two ways, firstly as a step by step guide to help you to operate the transmitter. Secondly, it serves as a handy reference guide. It is written to cover as many anticipated applications of the transmitter as possible. If there are doubts in the use of the transmitter, please do not hesitate to contact the nearest Authorized Distributor.

Eutech Instruments/ Oakton Instruments will not accept any responsibility for damage or malfunction to the transmitter caused by improper use of the instrument.

Remember to fill in the guarantee card and mail it back to your authorized distributor or Eutech Instruments Pte Ltd.

The information presented in this manual is subject to change without notice as improvements are made, and does not represent a commitment on the part of Eutech Instruments Pte Ltd/ Oakton Instruments.

Eutech Instruments Pte Ltd/ Oakton Instruments

TABLE OF CONTENTS

1 INTRODUCTION 1 2 PREPARATION 2

2.1 Power Supply Requirements 2

2.2 Connecting the Electrode and Temperature Probe 3

3 INSTALLATION 4

3.1 Wall Mount 4

3.2 Panel Mount 5

4 DISPLAY AND KEYPAD FUNCTIONS 6

4.1 Display 6

4.2 Keypad 7

5 CALIBRATION 8

5.1 Preparing the Transmitter for Calibration 8

5.2 pH Calibration 9

5.3 Relative mV Calibration 10

5.4 Temperature Calibration 10

6 ADVANCED SETUP FUNCTIONS 11

6.1 Offset Setting (Unavailable in ORP mode) 11

6.2 Output Range Setting 12

6.3 Temperature Compensation Setting (Unavailable in ORP mode) 13

6.4 HOLD Current Setting 15

6.5 Out-of-Range Current Setting 15

6.6 Configuration 16

7 PROBE CARE AND MAINTENANCE 17 8 TROUBLE SHOOTING GUIDE 19 9 SPECIFICATIONS 20 10 TECHNICAL DIMENSIONS 21 11 ACCESSORIES 22 12 WARRANTY 24 13 RETURN OF ITEMS 24

1 INTRODUCTION

Thank you for selecting a Eutech Instruments/ Oakton Instruments transmitter. The pH 500 pH/ORP Transmitter is a microprocessor-based instrument that is designed to be sturdy and user-friendly. It is capable of measuring pH, mV and temperature.

This transmitter has many user-friendly features – all of which are completely accessible through the water-resistant membrane keypad. Your transmitter includes an instruction manual and a warranty card.

Please read this manual thoroughly before operating your transmitter.

MEAS

READY

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Preparation

Remove screws from the four corners at the back of the Transmitter, and remove back cover. Connectors should be exposed as follows:

All wiring is done on the detachable 9-pin connector. Using a suitable screwdriver, loosen screws from top of connector.

When inserting the wires, always hold connector with top screws facing up.

1.1 Power Supply Requirements

This transmitter requires a 12 to 24V DC power supply. Other Transmitters and/or a chart recorder may be connected in series.

Insert positive loop wire from power supply to pin 1, tighten screw.

Insert negative loop wire to pin 2, tighten screw. This wire may be linked to the positive terminal of next transmitter (pin 1) / Chart recorder or to negative terminal of power supply

1.2 Connecting the Electrode and Temperature Probe

To connect the pH or ORP electrode:

The Eutech Instruments pH transmitter uses any standard pH or ORP.

Remove BNC connector from cable. Two wires will be exposed:

Insulation

pH reference

Clear sheath

pH sensing

Screen

Strip insulation, just enough to expose bare wires.

IMPORTANT: For pH/ORP sensing cable, remember to strip the inner black layer (screen) and expose the clear plastic sheath.

Insert pH sensing cable into pin 9 of connector. Tighten screw.

Insert pH reference cable into pin 7 of connector. Tighten screw.

To connect temperature probe:

For Automatic Temperature Compensation (ATC), this transmitter requires a temperature probe, Pt 100, 3-wire.

3-wire probe:

Insert brown wire to pin 4 of connector. Tighten screw.

Insert red wire to pin 5 of connector. Tighten screw.

Insert green wire to pin 6 of connector. Tighten screw.

2-wire probe:

Take a small length of wire and short pins 4 and 5 of connector. Insert red wire into pin 5 of connector and tighten screws.

Insert green wire to pin 6 of connector. Tighten screw.

IMPORTANT: Temperature probe should always be together with pH probe, even during calibration. Make sure no bare wires are exposed and all screws are tightened for proper contact.

To connect Potential Matching Pin (Liquid electrical interferences):

Connect the additional wire from the electrode to pin 3. Transmitter must be configured to ‘Symmetrical mode of operation’ - Please refer to ‘Advanced Setup Functions’, Section 6.6.2 - ‘Selecting Asymmetrical or Symmetrical Mode of Operation.

2 INSTALLATION

2.1 Wall Mount

2.2 Panel Mount

1. Prepare panel cut-out of

92.0 mm by 92.0 mm

2. Remove back cover of transmitter and slide it through panel cut-out

Panel (side)

4. Thread rods through lugs until transmitter is held in place against

panel

3. Attach lugs to either side of transmitter

3 DISPLAY AND KEYPAD FUNCTIONS

3.1 Display

The LCD has a primary and secondary display.

• The primary display shows the measured pH, mV or Relative mV value.

• The secondary display shows the measured temperature. In Calibration mode, pH buffer values are displayed here; while measured mV values are displayed in the ORP Calibration mode.

123

SETUP MEAS CAL

15 14

READY

HOLD

-.8.8.8

1. SETup mode indicator

2. MEASurement mode indicator

3. CALibration indicator 8. pH buffer selection indicator

ERR

-1.8.8.8

1112

6. Primary display 11. ERRor indicator

7. Temperature indicator

mV pH

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ATC

12. Probe indicator

13. Buffer indicator

4 5

4. mV indicator

5. pH indicator

9. Automatic Temperature Compensation

indicator

10. Secondary display 15. READY indicator

14. HOLD indicator

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