Eutech Instruments PH 500 User Manual

Instruction Manual

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pH 500 LCD Transmitter

pH/ORP Transmitter with Display

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68X216829

Rev 2 05/04

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.

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 / Oakton Instruments.

Eutech Instruments / Oakton Instruments

Rev 2 05/04

TABLE OF CONTENTS

1 INTRODUCTION 1 2 PREPARATION 2

2.1 Power Supply Requirements (SL2 Position) 3

2.2 Connecting the Electrode and Temperature Probe (SL1 Position) 3

3 INSTALLATION 5

3.1 Wall Mount 5

3.2 Panel Mount 6

4 DISPLAY AND KEYPAD FUNCTIONS 7

4.1 Display 7

4.2 Keypad 8

5 CALIBRATION 9

5.1 Preparing the Transmitter for Calibration 9

5.2 pH Calibration 10

5.3 Relative mV Calibration 11

5.4 Temperature Calibration 11

6 ADVANCED SETUP FUNCTIONS 12

6.1 Offset Setting (Unavailable in ORP mode) 12

6.2 Output Range Setting 13

6.3 Temperature Compensation Setting (Unavailable in ORP mode) 14

6.4 HOLD Current Setting 17

6.5 Out-of-Range Current Setting 17

6.6 Configuration 18

7 PROBE CARE AND MAINTENANCE 20 8 TROUBLE SHOOTING GUIDE 22 9 SPECIFICATIONS 23 10 TECHNICAL DIMENSIONS 24 11 ACCESSORIES 25 12 WARRANTY 27 13 RETURN OF ITEMS 27

Instruction Manual pH 500

1 INTRODUCTION

Thank you for selecting a pH 500 pH/ORP Transmitter. This 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.

READY

MEAS

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°C

Instruction Manual pH 500

2 PREPARATION

Remove screws from the four corners at the back of the Transmitter, and remove back cover.

Connectors should be exposed as follows:

Figure 1 – Connection Guide

All wiring is done on 2 detachable connectors: –

1. 9-pin connector (located on SL1 position) for pH electrode, temperature sensor and potential matching pin (PMP); &

2. 3-pin connector (located on SL2 position) for power supply.

Using a suitable screwdriver, loosen screws from top of connector.

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

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Instruction Manual pH 500

2.1 Power Supply Requirements (SL2 Position)

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

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

2. Insert negative loop wire to pin 2, tighten screw. This wire may be linked to a chart recorder or to negative terminal of power supply.

Alpha pH5 00

Power Su pply

Chart recorde r

2.2 Connecting the Electrode and Temperature Probe (SL1 Position)

2.2.1 To connect the pH or ORP electrode:

The pH transmitter accepts any combination

electrode for pH or ORP measurements

1. Remove BNC connector from cable.

Two wires will be exposed.

Insulation

pH reference

Clear sheath

pH sensing

Screen

2. 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.

1. Insert pH sensing cable into pin 1 of connector. Tighten screw.

2. Insert pH reference cable into pin 2 of connector. Tighten screw.

NOTE: Instead of removing the BNC connection, Oakton offers an optional adapter (part number 05994-90 BNC to Spade Lug adapter) that can be

used.

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Instruction Manual pH 500

2.2.2 To connect temperature probe:

For Automatic Temperature Compensated (ATC) pH readings, a 100Ω Pt RTD temperature probes can be used. Industrial pH electrodes are often offered with

ATC, which will typically be bare wires.

3-wire probe

1. Insert Pt 100 sense wire to pin 5 of connector. Tighten screw.

2. Insert Pt 100 input wire to pin 6 of connector. Tighten screw.

3. Insert Pt 100 return wire to pin 7 of connector. Tighten screw.

2-wire probe:

1. Take a small length of wire and short pins 5 and 6 of connector. Insert Pt 100 sense wire into pin 6 of connector and tighten screws.

2. Insert Pt 100 return wire to pin 7 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.

2.2.3 To connect Potential Matching Pin (Liquid elec trical interferences):

Connect the additional wire from the electrode to pin 8. 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.

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Instruction Manual pH 500

3 INSTALLATION

3.1 Wall Mount

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Instruction Manual pH 500

3.2 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

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Instruction Manual pH 500

4 DISPLAY AND KEYPAD FUNCTIONS

4.1 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 6. Primary display

2. MEASurement mode indicator

3. CALibration indicator 8. pH buffer selection indicator

4. mV indicator

5. pH indicator 10. Secondary display

ERR

-1.8.8.8

1112

7. Temperature indicator

9. Automatic Temperature Compensation indicator

mV pH

°C pH ATC

4 5

11. ERRor indicator

12. Probe indicator

13. Buffer indicator

14. HOLD indicator

15. READY indicator

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+ 22 hidden pages