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Instruction Manual
αlpha-pH550
pH Monitor
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Part of Thermo Fisher Scientific
68X216869 Rev.2 Aug 07
Preface
This manual serves to explain the use of the αlpha-pH 550 Monitor. The manual
functions in two ways, firstly as a step by step guide to help the user operate the
instrument. Secondly, it serves as a handy reference guide. This instruction manual is
written to cover many anticipated applications of the αlpha-pH 550 Monitor. If you
have doubts in the use of the instrument, please do not hesitate to contact the
nearest Eutech Instruments Authorised Distributor.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on part of Eutech
Instruments.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the
unit due to improper use of the instrument.
Copyright ©2006 All rights reserved.
Eutech Instruments Pte Ltd.
Table of Contents
1. Introduction ...........................................................................................................1
1.1 Before You Begin ................................................................................................................... 1
1.2 Intended Use .......................................................................................................................... 1
1.3 Safety Instructions.................................................................................................................. 2
1.4 Putting Out of Service / Correct Disposal of the Unit ............................................................. 2
2. Getting Started ......................................................................................................3
2.1 Description of Instrument ....................................................................................................... 3
2.2 Measurement System ............................................................................................................ 4
2.3 Connecting Peripherals.......................................................................................................... 5
2.3.1 Connection Terminals.................................................................................................... 5
2.3.2 Switching Between PT100 & PT1000 Temperature Sensors ....................................... 6
2.3.3 Connecting pH/ORP Electrode ...................................................................................... 7
2.3.4 Connecting Temperature Probe .................................................................................... 7
2.3.5 Connect Potential Matching Pin (PMP) ......................................................................... 7
2.4 Installation .............................................................................................................................. 8
2.4.1 Mechanical Dimensions................................................................................................. 8
2.4.2 Wall Mount..................................................................................................................... 8
2.4.3 Panel Mount................................................................................................................... 9
2.5 Display & Keypad ................................................................................................................. 10
2.5.1 Display Overview......................................................................................................... 10
2.5.2 Key Functions.............................................................................................................. 11
3. Operation .............................................................................................................12
3.1 Measurement mode ............................................................................................................. 12
3.2 Menu Overview .................................................................................................................... 13
3.2.1 αlpha pH 550 ............................................................................................................... 13
4. Calibration Mode .................................................................................................14
4.1 Preparing the Monitor & Electrode for Calibration ............................................................... 14
4.2 Entering pH/ORP Calibration Mode ..................................................................................... 14
4.3 pH Calibration....................................................................................................................... 15
4.3.1 For USA Standard Buffer............................................................................................. 15
4.3.2 For NIST Buffer ........................................................................................................... 17
4.4 ORP Calibration ................................................................................................................... 20
4.5 Temperature Calibration ...................................................................................................... 20
5. Setup Mode ..........................................................................................................21
5.1 Enter Setup mode ................................................................................................................ 21
5.2 Electrode Offset Settings ..................................................................................................... 22
5.3 Temperature Settings........................................................................................................... 23
5.4 Buffer Selection Settings...................................................................................................... 25
5.5 Configuration Settings.......................................................................................................... 26
5.6 Viewing Electrode Properties ............................................................................................... 28
6. Technical Specifications.....................................................................................29
7. List of Accessories .............................................................................................30
7.1 Eutech Instruments .............................................................................................................. 30
7.2 Oakton Instruments.............................................................................................................. 31
8. Troubleshooting ..................................................................................................32
9. General Information ............................................................................................33
9.1 Warranty............................................................................................................................... 33
9.2 Return of Goods ................................................................................................................... 33
9.3 Guidelines for Returning Unit for Repair .............................................................................. 33
9.4 Maintenance and Cleaning .................................................................................................. 33
10. Appendices .......................................................................................................34
10.1 Appendix 1 – pH Buffer Values at Various Temperatures ................................................... 34
10.2 Appendix 2 – Abbreviations Used in LCD............................................................................ 35
Instruction Manual αlpha-pH 550
Eutech Instruments 1
1. Introduction
1.1 Before You Begin
We thank you for purchasing the αlpha pH 550 Monitor.
The construction of the pH 550 Monitor employs leading edge technology
and complies with safety regulations currently in force. Notwithstanding this,
improper use could lead to hazards for the user or a third-party, and/or
adverse effects on the plant or other equipment. Therefore, the operating
instructions must be read and understood by the persons involved before
working with the pH Monitor.
The instruction manual must always be stored close at hand, in a place
accessible to all people working with the pH Monitor.
If you have questions, which are not or insufficiently answered in this
instruction manual, please contact your authorized supplier. They will be glad
to assist you.
1.2 Intended Use
αlpha pH 550 Monitors are intended solely for pH or ORP and temperature
measurement, as described in this instruction manual.
Any other use, or use not mentioned here, that is incompatible with the
technical specifications is deemed inappropriate. The operator is solely
responsible for any damage arising from such use.
Other prerequisites for appropriate use include:
– Comply with the instructions, notes and requirements set out in this
instruction manual.
– Comply with all local safety regulations concerning safety at work.
– Comply with all information and warnings in the documentation dealing
with the products used together with the pH Monitor (housing, sensors,
etc.).
– Comply with the local environmental and operational conditions.
Instruction Manual αlpha-pH 550
Eutech Instruments 2
1.3 Safety Instructions
- The αlpha pH 550 Monitor should be installed and operated only by
personnel familiar with the instrument and who are qualified for
such work.
- A defective pH Monitor must neither be installed nor put into service.
- The αlpha pH 550 must only be operated under the specified
operating conditions (see section 6).
- The αlpha pH 550 must not be repaired by the customer.
- No modifications to the αlpha pH 550 are allowed. The
manufacturer/supplier accepts no responsibility for damage
caused by unauthorized modifications. The risk is borne entirely
by the user.
1.4 Taking Out of Service / Correct Disposal of the Unit
Taking out of Service
• First disconnect the unit from the power supply and then undo all electrical
connections.
• Remove the unit from the wall / panel.
Correct Disposal of the Instrument
When the αlpha pH 550 Monitor is permanently taken out of service, obey
the local environmental regulations for correct disposal or send the
instrument to your local distributor, they will take care of proper disposal.
Instruction Manual αlpha-pH 550
Eutech Instruments 3
2. Getting Started
2.1 Description of Instrument
The Eutech Instruments’ αlpha pH 550 Monitor is used for measuring pH
and temperature values. The pH values can be measured using industrial
combination pH sensors. The temperature values can be measured using 3wire Pt100 / Pt1000 sensors. The monitor can be used for applications such
as water treatment and monitoring, galvanic-decontamination, chemical
processing, food processing, clean or wastewater control and neutralization
processes.
The pH Monitor has many user-friendly and safety features which include:
• Push-button keypad for calibration and setup
• Built-in non-volatile memory to ensure that calibration and other
information are not erased if power supply fails
• Menu-driven program that simplifies setup
• 1 or 2 point calibration with selectable USA or NIST standard pH buffer
set
• Automatic temperature compensation (ATC)
• Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature
• Large dual display LCD for easy reading with clear multiple annunciators,
operational mode indicators and error indicators.
Instruction Manual αlpha-pH 550
Eutech Instruments 4
2.2 Measurement System
A typical measurement system consists of:
• A pH process monitor
• A pH sensor with integrated or separate Pt100/Pt1000 temperature
sensor
• An appropriate measurement cable
• An immersion, flow or process assembly
Power Adaptor
(+9 V DC)
Measurement Cable
Housing and
Sensors
Alpha pH 550 Monitor
ENT
ESC
pH Monitor
lpha pH55 0
CAL
Instruction Manual αlpha-pH 550
Eutech Instruments 5
2.3 Connecting Peripherals
2.3.1 Connection Terminals
Remove Back Cover:
Remove the screws from the four corners at the back of the pH Monitor.
Remove the back cover. The connectors are exposed on the back PCBA as
shown in the Figure 1 below.
Connectors:
• J11 – 24V DC power
• J8 – 9V DC power
• J10 - pH electrode & Temperature probe connections (wiring has to be
done in the detachable connector
24V DC
J11
J10
J8
9V DC Power
Screw
1)+ve
2)Gnd
J11 Connections
1. +ve
2. Gnd
J10 Connections
1. pH Sense
2. pH Reference
3. No Connection
4. No Connection
5. Pt 100 Compensate
6. Pt 100 Sense
7. Pt 100 GND
8. Potential Matching Pin
Figure 1: Outer Side of Back PCBA
Instruction Manual αlpha-pH 550
Eutech Instruments 6
Switching Between PT100 & PT1000 Temperature Sensors
The Controller supports both Pt100 & Pt1000 (2-wire or 3-wire) temperature
sensors. The default factory setting is Pt100. If you need to use Pt1000
temperature sensor, you have to change the jumper setting (J7) as described
below.
Remove Back Cover:
Remove screws from the four corners at the back of the pH Controller.
Remove the back cover.
Remove Back PCBA:
Remove the screw located center of the back PCBA (Figure 1). Detach the
back PCBA from the Controller. Turn over the back PCBA. Locate J7 jumper
on the inner side of the back PCBA as shown in Figure 2 below.
Figure 2: Inner Side of Back PCBA
Set Jumper J7:
Set the J7 jumper to required sensor (Pt100 or Pt1000) type
Instruction Manual αlpha-pH 550
Eutech Instruments 7
2.3.2 Connecting pH/ORP Electrode
1. If the pH/ORP electrode has a BNC connector, remove the BNC connector
from the cable.
NOTE: Oakton Instruments offers an optional ‘BNC to Spade Lug adapter’
(Order code: 05994-90) that can be used with pH/ORP electrode without
removing the BNC connector.
2. Strip the insulation of the cable so that the bare wires are exposed enough
for connection as shown in Figure 3.
Insulation
pH Reference Wire
Clear sheath
pH Sensing Wire
Screen
Figure 3 : pH/ORP Electrode Cable
NOTE: Make sure to strip inner black layer (screen) to expose the clear
sheath.
3. Connect pH sensing wire to Pin 1 of J10 connector
4. Connect pH reference wire to Pin 2 of J10 connector
2.3.3 Connecting Temperature Probe
For Automatic Temperature Compensated (ATC) pH readings, a 100Ω Pt
RTD temperature probe (2-wire or 3-wire) can be connected to the Controller.
3-Wire Probe:
1. Connect PT100 compensate wire to Pin 5 of J10 connector
2. Connect PT100 sense wire to Pin 6 of J10 connector
3. Connect PT100 GND wire to Pin 7 of J10 connector
2-Wire Probe:
1. Short Pin 5 & 6 of J10 connector using a small piece of wire.
2. Connect PT100 sense wire to Pin 6 of J10 connector
3. Connect PT100 GND wire to Pin 7 of J10 connector
2.3.4 Connect Potential Matching Pin (PMP)
If using an electrode with a PMP, connect the additional wire (PMP) from the
pH electrode to Pin 8 of J10 connector. This liquid electrical reference wire is
only used when the pH Controller is configured to ‘Symmetrical mode of
operation’. Refer section 5.5 for details on symmetrical mode of operation.
Instruction Manual αlpha-pH 550
Eutech Instruments 8
2.4 Installation
2.4.1 Mechanical Dimensions
ENT
ESC
pH Monitor
lpha pH 550
CAL
2.4.2 Wall Mount
Pierce through holes at
both sides
11
Cover the catch slots at
both sides with overlays
2
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