Thermo Fisher Scientific pH 500 User Manual
Alpha pH 500
2-Wire Transmitter
pH / ORP
AQUAfast, Cahn, ionplus, KNIpHE, No Cal, ORION, perpHect, PerpHecT,
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Preface
This manual serves to explain the use of the Alpha 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.
Thermo Scientific 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
Thermo Scientific.
Copyright © 2009
All rights reserved
TABLE OF CONTENTS
1 INTRODUCTION 1
2 PREPARATION 2
2.1 Power Supply Requirements (SL2 Position) 3
2.2 Connecting the Electrode & 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
MEAS
°C
REA DY
ATC
pH
1 INT R ODU CTI O N
Thank you for selecting an Alpha 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.
1
2 PRE PAR ATION
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.
2
Alpha pH500
Power Supply
Chart recorder
1
2
Insulation
pH reference
Clear sheath
pH sensing
Screen
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.
2.2 Connecting the Electrod e and Tempera ture 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.
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, Eutech offers an optional
adapter (part number 05994-90 BNC to Spade Lug adapter) that can be
used.
3
2.2.2 To connect temperature probe:
For Automatic Temperature Compensated (ATC) pH readings, a 100 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 electrical 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.
4
3 INS TALL ATIO N
3.1 Wall Mount
5
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)
3. Attach lugs to either
side of transmitter
4. Thread rods through
lugs until transmitter
is held in place against
panel
3.2 Panel M ount
6
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