Alpha pH 550
Monitor
pH / ORP
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Preface
This manual serves to explain the use of the Al pha pH 550 Monitor. The manual
functions in two ways, firstly as a step by step guide to help the us er operate the
instrument. Secondly, it serves as a handy reference guide. This instruction manual
is written to cover as many anticipated applications of the Alpha pH 550 Monitor. If
you have doubts in the use of the instrument, please do not hesitate to contact your
nearest Alpha 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 Thermo
Scientific.
Thermo Scientific cannot accept any responsibilit y for damage or malfunction of the
unit due to improper use of the instrument.
Copyright © 2006
All rights reserved
TABLE OF CONTENTS
1 INTRODUCTION 1
1.1 Before You Begin...........................................................................................1
1.2 Intended Use..................................................................................................1
1.3 Safety Instructions..........................................................................................2
1.4 Taking 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
2.4 Installation....................................................................................................9
2.5 Di sp l ay & K ey p ad .......................................................................................11
3 OPERATION 14
3.1 Measurement mode.......................................................................................14
3.2 Menu Overview..............................................................................................15
4 CALIBRATION MODE 16
4.1 Preparing the Monitor & Electrode for Calibration.........................................16
4.2 Entering pH/ORP Calibration Mode...............................................................16
4.3 pH Calibration ................................................................................................17
4.4 ORP Calibration .............................................................................................21
4.5 Temperature Calibration ................................................................................ 22
5 SETUP MODE 23
5.1 Enter Setup mode ..........................................................................................23
5.2 E
lectrode Offset Setti
ngs ...............................................................................24
5.3 Temperature Settings.....................................................................................25
5.4 Buffer Selection Settings................................................................................27
5.5 Configuration Settings....................................................................................28
5.6 Viewing Electrode Properties.........................................................................30
6 TECHNICAL SPECIFICATIONS 32
7 LIST OF ACCESSORIES 33
7.1 Thermo Scientific Order Codes......................................................................33
7.2 Eutech Instruments Order Code ....................................................................34
8 TROUBLESHOOTING 35
9 GENERAL INFORMATION 36
9.1 Warranty.........................................................................................................36
9.2 Return of Goods.............................................................................................36
9.3 Guidelines for Returning Unit for Repair........................................................36
9.4 Maintenance and Cleaning............................................................................37
10 APPENDICES 38
10.1 Appendix 1 – pH Buffer Values at Various Temperatures............................. 38
10.2 Appendix 2 – Abbreviations Used in LCD......................................................38
1 INTRODUCTION
1.1 Before You Begin
Thank you for purchasing the Alpha pH 550 Monitor.
The construction of the Alpha 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 ha nd, 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
Alpha 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 oper ator 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 a nd warnings in the documentation deali ng with the
products used together with the pH Monitor (housing, sensors, etc.).
– Comply with the local environmental and operational conditions.
- 1 -
1.3 Safety Instructions
The Alpha 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 Alpha pH 550 must only be operated under the
specified operating conditions (see section 6).
The Alpha pH 550 must not be repaired by the
customer.
No modifications to the Alpha pH 550 are allowed. T he
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 disconnec t the unit from the power supply and then un do all electrical
connections.
Remove the unit from the wall.
Correct Disposal of the Instrument
When the Alpha pH 550 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.
- 2 -
2 GETTING STARTED
2.1 Description of Instrument
The Alpha pH 550 Monitor is used for meas uring pH and temperature values. T he
pH values can be measured using industrial combination pH sensors. The
temperature values can be measured using 3-wire 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.
- 3 -
A
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
lpha pH 550 Monitor
ESC
CAL
pH Monitor
lpha pH550
ENT
Power Adaptor
Housing and
Sensors
Measur ement Cable
(+9 V DC)
- 4 -
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
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
the detachable connector
24V DC
1)+v
J10
J8
9V DC Power
Screw
Figure 1: Outer Side of Back PCBA
- 5 -
2.3.2 Switching Between PT100 & PT1000 Temperatu re Sensors
The Monitor 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 th e
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
- 6 -
2.3.3 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
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
pH Reference Wire
Clear sheath
pH Sensing Wire
Screen
- 7 -
2.3.4 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 co nnector
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
2.3.5 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.
- 8 -
2.4 Installation
2.4.1 Mechanical Dimensions
CAL
PH/ORP RF Transmitter
2.4.2 Wall Mount
2
Alpha pH 550
Alpha pH 600
ESC
ENT
pH Monitor
Pierce through holes at both sides
11
Cover the catch slots at both sides
with overlays
- 9 -
f
f
A
r
2.4.3 Panel Mount
Prepare panel cut-out o
1
1
92.0 mm X 92.0 mm
Remove back cover o
2
pH Monitor and slide it
through panel cut-out
Panel
Gasket
Panel
Insert threaded rods through catch
4
until pH Meter is held against panel
ttach catch to both sides
3
of pH Mete
- 10 -
A
2.5 Display & Keypad
2.5.1 Display Overview
The Liquid Crystal Display (LCD) of Alpha pH 550 has two alpha-numerical displa ys
(Upper and a Lower).
• Upper display: Measured pH, mV or relative mV value are
displayed when the Monitor is in normal operation (measurement)
mode.
• Lower display: Measured temperature value is displayed whe n the
Monitor is in normal operation (measurement) mode. In pH
Calibration mode, standard pH buffer values are displayed here:
while measured mV values are displayed in the ORP Calibration
mode.
The two displays indicate function names, options & settings in Setup m ode. Refer
‘Appendix 2 – Abbreviations Used in LCD’ for more details.
The LCD also consists of various mode indicators, status annunciators and unit of
measurement indicators.
SETUP MEAS CAL
READY
ERR
-8.8.8.8
-8.8.8.8
- 11 -
R.mV
pH
°C
pH
TC
°F
Mode Indicators
MEAS
SETUP
CAL
Status Annunciators
READY
ATC
ERR
Measurement mode; blinks in Symmetric mode
(Refer Section 3.1& 5.5 )
Setup mode (Refer Section 5)
Calibration mode (Refer Section 4)
Appears when the reading is stable
Appears when Automatic Temperature Compensation (ATC) is
enabled.
Not visible when Manual Temperature Compensation (MTC) is
enabled.
Flashes if the temperature probe is faulty in its ATC mode.
(Refer Section 5.3)
Appears when an error occurs (Eg. wrong key pressed)
Electrode annunciator. Appears when viewing electrode properties
or during calibration error
Buffer annunciator. Appears in calibration mode
Units of Measurement Indicators
mV
R.mV
pH
ºC
ºF
Millivolt. Appears in ORP measurement / calibration modes
(Refer Section 3.1, 4.4)
Relative Millivolt
Appears in pH measurement/calibration modes
(Refer Section 3.1,4.3)
Temperature in Celsius (Refer Section 5.3)
Temperature in Fahrenheit (Refer Section 5.3)
- 12 -
2.5.2 Key Functions
Alpha pH 550
Alpha pH 60 0
ESC
Key Description
CAL
Enter Calibration mode.
Enter Setup mode
Access sub screens (parameters) within a group of settings in
ENT
Setup mode
Confirm (save) setup parameters and numerical values
Start/Confirm calibration in Calibration mode.
Select a group of settings in Setup mode.
Select parameters and increment/decrement numerical values in
Setup and Calibration modes.
(When pressed continuously, speed of value increment/decrement
increases)
Returns to Measurement mode when both keys are pressed
simultaneously.
CAL
pH Monitor
PH/ORP RF Tra n smitter
ENT
- 13 -
3 OPERATION
3.1 Measurement mode
When the pH Monitor is powered on, the display shows all the LCD segments
briefly, and then automatically enters into the Measurement mode.
MEAS
READY
pH
7.00
°C
25.0
The mode indicator ‘MEAS’ at the top of the displa y indicat es that the pH monitor is
in Measurement mode; ‘MEAS’ blinks when in Symmetric mode. The upper alph anumerical display shows the measured pH or mV value, while the lower display
shows the temperature value. The indicator “pH” or “mV” at the upper right side of
the display indicates the current measurement mode. (Refer Section 5.5 for
switching measurement modes)
NOTE:
From measurement mode you can access:
For more details, refer section 4 for Calibration mode and section 5 for Setup
mode.)
To guarantee accurate readings, the measuring system (the pH
Transmitter and the sensor) must be calibrated regularly.
• Calibration mode (by pressing CAL key)
• Setup mode (by pressing ENT key)
ATC
- 14 -
3.2 Menu Overview
3.2.1 Alpha pH 550
READY
MEAS
CAL
ENT
SETUP
SETUP
SETUP
SETUP
SETUP
CAL
ENT ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
pH
°C
ATC
- 15 -
4 CALIBRATION MODE
4.1 Preparing the Monitor & Electrode for Calibration
Before starting calibration, make sure that the pH Monitor is in appropriate
measurement mode (pH or ORP). When the monitor is switched on, it starts up with
the measurement mode last used. For example, if the pH Monitor is switched off in
ORP measurement mode, it starts up in ORP mode when it is switched on. (Refer
Section 5.5 for switching measurement modes)
Be sure to remove the protective electrode storage bottle or rubber cap of the
electrode before calibration or measurement. If the electro de has been stored dry,
wet the electrode in tap water for 10 minutes before calibrating or taking readings to
saturate the pH electrode surface and minimize drift.
Rinse the electrode in de-ionized water after use, and store in electrode storage
solution. If storage solution is not available, use pH 4.01 or 7.00 buffer solution.
Do not reuse buffer solutions after calibration. Contaminants in the solution can
affect the calibration, and the accuracy of the measurements.
The pH Monitor features two internationally recognized pH buffer standards. Select
the buffer standard you require in the setup mode. (Refer Section 5.4) Available
buffer options are:
• USA buffers --- pH 4.01, 1.68, 7.00, 10.01 and 12.45
• NIST buffers --- pH 4.01, 1.68, 6.86, 9.18 and 12.45
4.2 Entering pH/ORP Calibration Mode
While in measurement mode, press the CAL key to access calibration mode. LCD
indicates ‘CAL PH’ (when measurement mode is pH) or ‘CAL OrP’ (when
measurement mode is ORP).
READY
MEAS
pH
°C
ATC
CAL
CAL
HOLD
To quit Calibration Mode
- 16 -
ENT
Calibration Mode
pH Calibration
OPR Calibration
Temp. Calibration
&
- See Section 4.3
- See Section 4.4
- See Section 4.5
NOTES:
• T o exit calibration mode at any time durin g calibration, press ▲
and ▼ keys simultaneously (escape). The pH Monitor returns
to the measurement mode and the old calibration values re main
active
• The calibration is always carried out in the units of
measurement (pH or mV), selected in setup mode
4.3 pH Calibration
The pH Monitor is capable of calibration of up to 2 points usin g USA or NIST pH
buffer standards. All new calibration values will automatically override existing
calibration data. pH buffer values are referenced to 25
measurement mode is set to pH. (Refer Section 5.5 for switching measurement
modes). All pH buffer values have window of up to ± 1 pH tolerance during
calibration. Calibration error can be occurred if the measur ed pH val ue e xceeds this
window. If you wish to abort the pH calibration, press ▲ and ▼ keys simultaneously
and the pH Monitor reverts to pH measurement mode.
4.3.1 For USA Standard Buffer
Make sure that the pH Monitor is set to accept USA standard buffer in the Setup
mode. (Refer Section 5.4 for Buffer Selection Settings) The factory default is USA
standard. It is recommended that you perform 2-point calibration at room
temperature (25
o
C), starting with the first buffer at pH 7.00 followed by any other
buffer value. (pH 4.01, 1.68, 10.01 or 12.45)
1-Point Calibration:
CAL
2
pH
CAL
pH
CAL
HOLD
HOLD
CAL
1
ENT
READY
HOLD
From pH measurement mode press CAL key to enter calibration mode as
11
described in section 4.2. The LCD shows ‘CAL PH’. Press ENT key to
begin calibration.
Place the electrode in pH 7.00 buffer. Immerse the temperature probe in
2
the buffer solution if ATC mode is enabled. Immerse the potential matching
pin in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 7.00 (USA standard buffer).
o
C. Make sure the
3
mV
ENT
pH
READY
MEAS
4
PH
°C
ATC
- 17 -
3
4
2-Point Calibration:
1
CAL
ENT
Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press CAL key to confirm the reading.
The calibration is completed. The pH Monitor re-calculates electrode
properties based on the calibration. The new slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00 ± offset) is shown in the
lower display.
Press ENT key to exit from the calibration.
The pH Monitor reverts to pH measurement mode.
NOTE:
Refer notes at the end of this section for additional
information and possible error indicators of calibration
process
4
mV
CAL
pH
MEAS
READY
ENT
READY
2
CAL
pH
ENT
READY
pH
READY
3
CAL
pH
ENT
CAL
pH
3
CAL
pH
ENT
pH
CAL
5
PH
°C
ATC
3
CAL
pH
READY
READY
CAL
ENT
pH
CAL
3
pH
ENT
pH
CAL
From pH measurement mode press CAL key to enter calibration mode as
11
described in section 4.2. The LCD shows ‘CAL PH’. Press ENT key to
begin first calibration point.
Place the electrode in pH 7.00 buffer. Immerse the temperature probe in
2
the buffer solution if ATC mode is enabled. Immerse the potential matching
pin in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 7.00 (USA standard buffer).
Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
- 18 -
Press ENT key to confirm the reading.
The pH Monitor moves to the second calibration point. The lower display
3
shows next standard buffer value (pH 4.01). Use ▲ and ▼ keys to select
your second buffer from one of the preset values: pH 4.01 or 1.68 or 10.01
or 12.45. Remove the electrode from the first buffer, rinse and then
immerse it into the second buffer. Allow the reading to stabilize. LCD shows
‘READY’ annunciator when the reading is stable.
Press ENT key (or CAL key) to confirm the reading.
The calibration is completed. The pH Monitor re-calculates electrode
4
properties based on the calibration. The new slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00 ± offset) is shown in the
lower display.
Press ENT key to exit from the calibration.
The pH Monitor reverts to pH measurement mode.
55
NOTES:
• To exit from pH calibration mode without confirming cali bration, press
▲ and ▼ keys together.
• When confirming the buffer measurement, if measured pH value is not
within ±1.00pH from selected buffer value, the electrode annunciator
blinks and ERR indicator appears in the display. This error can also
occur if non-standard buffers are used or the electrode has worn out.
If this happens, press both ▲and ▼ keys together to restart the
calibration beginning from Step1.
• When calibrating with manual temperature compensation, the meter
automatically changes from the preset ‘process temperature’ to the
‘calibration temperature’. After leaving the calibration mode, the pH
Monitor reverts back to ‘process temperature’.
4.3.2 For NIST Buffer
Make sure that the pH Monitor is set to accept NIST standard buffer in the Setup
mode. (Refer Section 5.4 for Buffer Selection Settings) The factory default is USA
standard. It is recommended that you perform 2-point calibration at room
temperature (25
o
C), starting with the first buffer at pH 6.86 followed by any other
buffer value. (pH 4.01, 1.68, 9.18 or 12.45)
- 19 -
1-Point Calibration:
1
CAL
HOLD
ENT
From pH measurement mode press CAL key to enter calibration mode as
11
described in section 4.2. The LCD shows ‘CAL PH’. Press ENT key to
begin calibration.
Place the electrode in pH 6.86 buffer. Immerse the temperature probe in the
2
buffer solution if ATC mode is enabled. Immerse the potential matching pin
in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 6.86 (NIST standard buffer).
Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press CAL key to confirm the reading.
The calibration is completed. The pH Monitor re-calculates electrode
3
properties based on the calibration. The new slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00 ± offset) is shown in the
lower display.
Press ENT key to exit from the calibration.
The pH Monitor reverts to pH measurement mode.
4
2-Point Calibration:
1
CAL
ENT
READY
READY
HOLD
CAL
CAL
2
pH
CAL
HOLD
pH
CAL
3
mV
ENT
pH
READY
MEAS
4
PH
°C
ATC
2
pH
ENT
READY
pH
3
CAL
pH
ENT
pH
CAL
4
mV
CAL
READY
ENT
pH
MEAS
5
PH
°C
ATC
3
CAL
pH
READY
READY
READY
CAL
CAL
ENT
pH
CAL
3
pH
ENT
pH
CAL
3
pH
ENT
pH
CAL
- 20 -
From pH measurement mode press CAL key to enter calibration mode as
11
described in section 4.2. The LCD shows ‘CAL PH’. Press ENT key to
begin first calibration point.
Place the electrode in pH 6.86 buffer. Immerse the temperature probe in the
2
buffer solution if ATC mode is enabled. Immerse the potential matching pin
in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 6.86 (NIST standard buffer).
Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press ENT key to confirm the reading.
The pH Monitor moves to the second calibration point. The lower display
3
shows next standard buffer value (pH 4.01). Use ▲ and ▼ keys to select
your second buffer from one of the preset values: pH 4.01 or 1.68 or 9.18 or
12.45. Remove the electrode from the first buffer, wash and then immerse it
into the second buffer. Allow the reading to stabilize. LCD shows ‘READY’
annunciator when the reading is stable.
Press ENT key (or CAL key) to confirm the reading.
The calibration is completed. The pH Monitor re-calculates electrode
4
properties based on the calibration. The new slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00 ± offset) is shown in the
lower display.
Press ENT key to exit from the calibration.
The pH Monitor reverts to pH measurement mode.
55
NOTES:
• To exit from pH calibration mode without confirming cali bration, press
▲ and ▼ keys together
• When confirming the buffer measurement, if the measured pH value is
not within ±1.00pH from selected buffer value, the electrode
annunciator
blinks and ERR indicator appears in the display. This
error can also occur if non-standard buffers are used or the electrode
has worn out. If this happens, press both ▲and ▼ keys together to
restart the calibration beginning from Step1
When calibrating with manual temperature compensation, the meter automatically
changes from the preset process temperature to the c alibration temperature. After
leaving the calibration mode, the pH Monitor reverts back to process temperature.
4.4 ORP Calibration
The pH Monitor allows a single point ORP calibration. ORP calibration process is
available only when the measurement mode is set to ORP. (Refer Section 5.5 for
switching measurement modes).
- 21 -
CAL
3
mV
ENT
READY
MEAS
R.mV
4
°C
ATC
HOLD
CAL
1
ENT
READY
HOLD
CAL
2
mV
READY
HOLD
From ORP measurement mode press CAL key to enter calibration mode
11
as described in section 4.2. The LCD shows ‘CAL OrP’. Press ENT key to
begin calibration.
Place the electrode in a standard ORP solution of known OPR value.
2
Immerse the temperature probe in the buffer solution if ATC mode is
enabled. Immerse the potential matching pin in the buffer if symmetrical
mode is enabled. The buffer annunciator
& electrode annunciator
appear in LCD. The upper display shows the current mV output of the
electrode with offset adjustment (if any). The lower display shows the
default (uncalibrated) mV output of the electrode. Allow the reading to
stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press ▲ or ▼ key to set the upper display value to the ORP value of the
solution. Allowable range: -150mV to 150mV.
Press ENT key to confirm the value.
3
The pH Monitor reverts to ORP measurement mode.
4
4.5 Temperature Calibration
Calibrate temperature probe only if temperature value displayed on the pH Monitor
is different from that of a calibrated thermometer. Refer to section 5.3 for further
information temperature settings.
- 22 -
5 SETUP MODE
5.1 Enter Setup mode
The setup mode allows you to customize the settings of the pH Monitor to suite your
requirements. While in measurement mode, press the ENT key to access setup
mode. LCD shows ‘SETUP’ mode indicator and the first page of setup (OFS – offset
settings). Press ▲ or ▼ key to access other pages of the setup mode.
READY
MEAS
ENT
pH
°C
ATC
SETUP
ENT
ENT
SETUP
SETUP
SETUP
SETUP
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
NOTES:
• To exit setup mode at any time press ▲ and ▼ keys
simultaneously (escape). The pH Monitor returns to the
measurement mode.
- 23 -
5.2 Electrode Offset Settings
NOTE:
In applications where continuous pH measurement is required, it may not be
convenient to remove the electrode for calibration. In such cases, an on-line offset
adjustment is recommended. The pH Monitor allows you set an offset of up to ±
2.00pH to compensate for errors in the pH electrode.
The pH Monitor adds or subtracts the offset value from the measured pH value and
displays the corrected value. However, if you need to offset the value beyond the
average offset you would expect in your application type, consider a full calibrati on
or even electrode replacement.
To Determine the Offset Value:
1. Take a sample from the liquid of pH measurement. Record the pH reading
2. Measure the pH value of your sample using another calibrated pH meter
‘Electrode Offset Setting’ is not available when the pH Monitor is
configured for ORP measurement mode. (Refer Section 5.5 for
switching measurement modes)
of the pH Monitor at the time the sample was taken.
having its own electrode (pH tester, hand-held meter or bench meter)
3. The difference between these two readings is the offset
SETUP
1
From pH measurement mode press ENT key to enter setup mode as
11
described in section 5.1. The LCD shows the first screen of setup mode
ENT
SETUP
READY
(OFS). Press ENT key to access electrode offset setting (OFS).
The upper display shows the last configured offset value (if any), otherwise
2
zero. The lower display shows currently measured pH reading (including
last configured offset value). Allow the reading to stabilize. LCD shows
‘READY’ annunciator when the reading is stable.
Press ▲ or ▼ key to set the upper display to the newly calculated offset
value.
As the upper display value (offset) changes, the pH Monitor adjust the lower
3
reading automatically to suit the new offset value. Up to ± 2.00 pH offset is
- 24 -
2
pH
pH
SETUP
READY
3
pH
pH
ENT
A
allowed.
Press ENT key to confirm the value. The pH Monitor reverts to OFS
screen.
Press ▲ or ▼ key to access other setup screens or press ▲ and ▼ key
simultaneously (escape) to return to measurement mode.
5.3 Temperature Settings
Automatic Temperature Compensation (ATC):
The pH values other than pH 7.00 are affected by temperature. Use ATC feature of
the pH Monitor to compensate for pH changes when the temperature of the sample
or process liquid fluctuates. Connect a separate temperature probe (Pt100/pt1000)
to the pH Monitor if an integrated pH/Temperature probe is not available.
Manual Temperature Compensation (MTC):
Set the pH Monitor to MTC (disable ATC) when the temperature of sample or
process liquid is constant and a temperature probe is not available. If you disable
ATC, the pH Monitor allows you to set your process temperature (P.ºC) and
calibration temperature (C.ºC). This allows calibration at a different temperature
other than the process temperature. Example: Setting calibration temperature of
25°C lets you calibrate using standard solutions at 25°C, even if your process
temperature is different from 25°C.
SETUP
1
SETUP
ENT
2
SETUP
ENT
°C
3
SETUP
ENT
°C
4
SETUP
°C
TC
5
°C
ATC
ENT
SETUP
2
SETUP
ENT
°F
3
SETUP
ENT
°C
6
From pH or ORP measurement mode press ENT key to enter
11
setup mode as described in section 5.1. The LCD shows the first
SETUP
ENT
7
ENT
screen of setup mode (OFS). Press ▲ or ▼ key to select
Temperature settings screen (SET ºCF).
Press ENT key to access temperature settings (SET ºCF).
- 25 -
Selecting unit of measurement for temperature: The upper
2
display shows ‘Unit’ and the lower display shows the last configured
unit of measurement for temperature.
Press ▲ or ▼ key to select the desired units for temperature (ºC
or ºF). Press ENT key to confirm your selection.
Enable/disable ATC: The lower display shows ‘AtC’ and the upper
3
display shows the last configured ATC selection (‘On’ or ‘OFF’).
Press ▲ or ▼ key to enable (ATC On) or disable (ATC OFF)
automatic temperature compensation. Press ENT key to confirm
your selection.
If ATC enabled (ATC On):
Setting temperature offset: The upper display shows the
4
last configured temperature offset value (if any), otherwise the
default is zero. The lower display shows currently measured
temperature reading (including last configured offset value).
LCD shows ‘ATC’ annunciator in lower-right corner.
Place a thermometer, which is known to be accurate, in your
sample or process liquid. Make sure your temperature probe
is placed in the same liquid. Compare the stabilized
temperature reading displayed on the monitor with the
thermometer. If there is a difference between the two readings
(offset), you can adjust the reading of the monitor. Press ▲ or
▼ key to adjust the lower display to the correct temperature
value.
As the lower display value changes, the pH Monitor adjust the
55
upper display reading automatically to suit the new offset
value. Up to ± 10 ºC/ ± 18 ºF offset is allowed.
Press ENT key to confirm the value. The pH Monitor reverts
to SET ºCF screen.
If ATC disabled (ATC OFF):
Setting process temperature: The lower display shows
6
‘P.ºC’ and the upper display shows the last configured
process temperature. Press ▲ or ▼ key to adjust the upper
display to desired process temperature. Allowable range: –
10.0 to 125.0°C / 14.0 to 257°F.
Press ENT key to confirm the process temperature.
Setting calibration temperature: The lower display shows
7
‘C.ºC’ and the upper display shows the last configured
calibration temperature. Press ▲ or ▼ key to adjust the
upper display to desired calibration temperature. Allowable
range: –10.0 to 125.0°C / 14.0 to 257°F.
Press ENT key to confirm the calibration temperature. The
pH Monitor reverts to SET ºCF screen.
- 26 -
Press ▲ or ▼ key to access other setup screens or press ▲ and ▼ key
simultaneously (escape) to return to measurement mode.
To exit from any intermediate steps, press ▲ and ▼ keys simultaneously
(escape). The pH Monitor returns to the first screen of temperature settings SET
ºCF.
5.4 Buffer Selection Settings
NOTE:
This allows you to set the pH Monitor to accept either USA or NIST pH buffer
standard group during pH calibration.
The buffer selection setting is only available if the monitor is
configured for pH measurement mode.
Buffer Group pH Buffer Points
USA pH 4.01, 1.68, 7.00, 10.01 & 12.45
NIST pH 4.01, 1.68, 6.86, 9.18 & 12.45
SETUP
HOLD
1
SETUP
ENT ENT
HOLD
SETUP
HOLD
2
2
ENT
From pH measurement mode press ENT key to enter setup mode
11
as described in section 5.1. The LCD shows the first screen of
setup mode (OFS). Press ▲ or ▼ key to select buffer settings
screen (bUFF).
Press ENT key to access buffer settings (bUFF).
Selecting buffer group: The lower display shows the last
2
configured buffer group. Press ▲ or ▼ key to select the required
buffer group (‘USA’ or ‘nST’).
- 27 -
Press ENT key to confirm your selection. The pH Monitor reverts
to bUFF screen.
Press ▲ or ▼ key to access other setup screens or press ▲ and ▼ key
simultaneously (escape) to return to measurement mode.
5.5 Configuration Settings
Configuration settings let you configure the pH Monitor to different measurement &
operation modes & reset the pH Monitor to factory defaults.
Asymmetrical Operation Mode (ASY):
This is the default mode of operation of the pH Monitor, which is suitable for most
applications where sample (or process) liquid is not interfered by adjac ent electrical
noise.
Symmetrical Operation Mode (SY):
This is mode of operation is recommended for applications where sample (or
process) liquid is subjected to high electrical interference and therefore the pH
reading becomes unstable. When the pH Monitor is set to s ymmetrical mode, you
should immerse the potential matching pin in the sample (or process) liquid or use a
pH electrode with built-in potential matching pin. The ‘MEAS’ indicator blinks when
the pH Monitor is set to Symmetric mode.
- 28 -
SETUP
1 2
SETUP
ENT
SETUP
SETUP SETUP
ENT
2
SETUP
ENT
3
ENT
3
ENT
From pH (or ORP) measurement mode press ENT key to enter
11
setup mode as described in section 5.1. The LCD shows the first
screen of setup mode (OFS). Press ▲ or ▼ key to select
configuration settings screen (Cnfg).
Press ENT key to access configuration settings (Cnfg).
Select measurement mode: The upper display shows the last
2
configured measurement mode (‘PH’ or ‘OrP’).
Press ▲ or ▼ key to select your desired measurement mode.
Press ENT key to confirm your selection.
NOTE: When the measurement mode is changed, the relay
operation parameters (described in section Error! Reference
source not found.) will be reset back to their default values.
Select operation mode: The upper display shows the last
3
configured operation mode. (‘ASY’ or ‘SY’).
Press ▲ or ▼ key to select your desired operational mode.
Press ENT key to confirm your selection.
Reset to factory defaults: The display shows ‘nO dEF’.
4
Press ▲ or ▼ key to select:
nO dEF :
No default reset of the pH Monitor. User configured
values remain active, when confirmed by pressing
ENT key.
FCt dEF:
Reset all settings of the pH Monitor to factory
defaults, when confirmed by pressing ENT key.
SETUP
SETUP
READY
MEAS
4
4
ENT
4
ENT
pH
°C
ATC
- 29 -
CAL dEF:
Reset all calibration settings of the pH Monitor to
factory defaults, when confirmed by pressing ENT
key.
Press ENT key to confirm your selection.
- If ‘nO dEF’ was selected, the pH Monitor reverts to Cnfg screen.
Press ▲ or ▼ key to access other setup screens or
press ▲ and ▼ key simultaneously (escape) to return
to measurement mode.
- If ‘FCt dEF’ or ‘CAL dEF’ was selected, the pH Monitor performs
the selected reset and returns to measurement mode.
Press ▲ or ▼ key to access other setup screens or press ▲ and ▼ key
simultaneously (escape) to return to measurement mode.
To exit from any intermediate steps, press ▲ and ▼ keys simultaneously
(escape). The pH Monitor returns to the first screen configuration settings (Cnfg).
5.6 Viewing Electrode Properties
Each time you calibrate your pH electrode, the pH Monitor re-calculates slope &
offset of the electrode and shown in the LCD at the end of cal ibration. The setup
mode allows you to view slope & offset values at any time.
NOTE:
When the measurement mode is set to ORP, only the offset value of
the electrode is displayed.
SETUP
HOLD
1
SETUP
ENT
For pH measurement mode
SETUP
For ORP measurement mode
2
mV
ENT
pH
2
mV
ENT
- 30 -
From pH (or ORP) measurement mode press ENT key to enter
11
setup mode as described in section 5.1. The LCD shows the first
screen of setup mode (OFS). Press ▲ or ▼ key to select viewing
electrode properties screen (CdAt).
Press ENT key to view electrode properties (CdAt).
2
Electrode status: The electrode annunciator
LCD. For pH measurement mode, the slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00 ± offset) is shown in
the lower display.
For ORP measurement mode, the offset value (in mV) of the
electrode is shown in the upper display.
Press ENT key to quit from electrode properties screen. The pH
Monitor reverts to CdAt screen.
Press ▲ or ▼ key to access other setup screens or press ▲ and ▼ key
simultaneously (escape) to return to measurement mode.
appears in the
- 31 -
6 TECHNICAL SPECIFICATIONS
General Specification
(a) pH
Measuring Range 0.00 to 14.00 pH
Resolution 0.01 pH
Accuracy ± 0.01 pH
(b) mV
Measuring Range -1000 to 1000 mV
Resolution 1 mV
Accuracy ± 1 mV
(c) Temperature
Measuring range -10.0 to +125.0 oC or +14.0 to +257 oF
Resolution 0.1
Relative accuracy ±0.5 oC
Sensor 2 wire / 3 wire - Pt100 or Pt1000 (Jumper
Compensation Automatic or Manual
Calibration
(a) pH
Number of calibration points 1 or 2 points
Number of calibration buffers USA: 1.68,4.01, 7.00, 10.01,12.45
(b) Temperature
Offset Adjustment ± 10 ˚C/ ± 18 ˚F
Input /Output
Input Asymmetrical / Symmetrical
Output None
Display
LCD 7 segments display with symbols for status
Electrical Data and Connections
pH/mV Input Screw Terminal (3.5mm pitch)
Connection terminal 8-pin & 2-pin terminal blocks
Other
Power Input Universal +9 V DC Adaptor and 24V DC
Dimensions (W x H x D) 96mm x 96mm x 66 mm
Weight (Estimated) 210g
Ambient Temp. operating range 0 to 40 oC
Maximum Relative Humidity 80% up to 31 oC decreasing linearly to 50% at
o
C
0.1 oF (Resolution is 0.1 oF up to 199.9 oF and
1 oF for 200 oF and above)
o
F
±1.0
Selectable)
NIST: 1.68,4.01, 6.86, 9.18 ,12.45
information
Supply
o
C
40
- 32 -
7 LIST OF ACCESSORIES
7.1 Thermo Scientific Order Codes
pH Monitor Replacement and Accessories
Item Description Order Code
Alpha pH 550 Monitor TSPHCP0550
Combination pH electrode with 5m cable EC-ARTSO-05B
Combination pH electrode with PMP and 5m cable EC-ARGTSO-05B
Combination pH electrode with PT 100, PMP and 5m cable EC-100GTSO-05B
Combination pH electrode, submersible, with 5m cable EC-DA93506-05B
Combination Gold ORP electrode with PMP and 5m cable EC-HTAUTSO-05B
Combination Platinum ORP electrode with PMP and 5m cable EC-HTPTTSO-05B
Calibration Solutions
Item Description Order Code
pH 4.01 buffer solution, 480 ml bottle EC-BU-4BT
pH 7.00 buffer solution, 480 ml bottle EC-BU-7BT
pH 10.01 buffer solution, 480 ml bottle EC-BU-10BT
pH 4.01 buffer sachets, 20 ml x 20 pcs. EC-BU-4BS
pH 7.00 buffer sachets, 20 ml x 20 pcs. EC-BU-7BS
pH 10.01 buffer sachets, 20 ml x 20 pcs. EC-BU-10BS
pH De-ionized water rinse sachets, 20 ml x 20 pcs EC-RIN-WT
pH sachet assortment pack – 5 each of pH 4.01, pH 7.00, pH 10.01 and
de-ionized water sachets per box.
Protein cleaning solution for pH electrode EC-DPC-BT
Storage solution for pH electrode EC-RE-005
NOTE:
• pH buffer solutions (480 ml bottle) have ±0.01 pH accuracy at 25 °C
• pH buffer sachets are individually sealed, single use pouch containing 20
ml of fresh, contamination free calibration solution
• pH buffer sachets have ±0.01 pH accuracy at 25°C
EC-AST-PK
- 33 -
7.2 Eutech Instruments Order Code
pH Monitor Replacement and Accessories
Item Description Order Code
Alpha pH 550 Monitor 56717-30
pH/Temp electrode with PMP and 10-ft cable 35807-20
Platinum ORP electrode with 10-ft cable 35801-21
BNC to spade lug adapter 05994-90
Calibration Solutions
Item Description Order Code
pH 4.01 calibration buffer, 500 ml 00654-00
pH 7.01 calibration buffer, 500 ml 00654-04
pH 10.01 calibration buffer, 500 ml 00654-08
pH 4.01 calibration buffer solution pouches, 20/box 35653-01
pH 7.00 calibration buffer solution pouches, 20/box 35653-02
pH 10.00 calibration buffer solution pouc hes, 20/box 35653-03
pH De-ionized water rinse sachets, 20 ml x 20 pcs 35653-00
Assortment pack – 5 each of pH 4.01, pH 7.00 and pH 10.00 solution
pouches.
Electrode cleaning solution 00653-06
Electrode storage solution 00653-04
35653-04
NOTE:
• To order Eutech accessories, contact the nearest Oakton distributor
- 34 -
8 TROUBLESHOOTING
Problem Cause Solution
Power on, but no display a) Loose connections
b) Incorrect output voltage of
the power adaptor
Unstable pH reading a) Dirty electrode
b) Electrical noise
interference
Oscillating temperature
readings
Slow response a) Dirty / Oily electrode a) Clean electrode
Blinking ATC a) No temperature probe
Blinking electrode
annunciator
Or (pH) a) pH electrode is not
Or (Temperature) a) Temperature probe is not
a) Electrical noise
interference
connection during ATC
mode
a) Error in calibration a) Ensure calibration standard
connected
connected when ATC
enabled
a) Ensure cables make good
contact
b) Use an power adaptor with
specified output voltage
a) Clean electrode and
recalibrate
b) Switch to Symmetric mode
a) Ensure shield wire is
properly connected to pin 7
a) Ensure temperature sensing
cable makes good contact
solution is not contaminated.
Ensure electrode is clean.
a) Ensure electrode makes
good contact with
Transmitter
a) Ensure electrode makes
good contact with
Transmitter
- 35 -
9 GENERAL INFORMATION
9.1 Warranty
This monitor is supplied with a one-ye ar warranty against significant deviations in
material and workmanship from date of purchase and a six-month warranty for
probe. Each instrument will have a warranty card with a specific ser ial nu mber. T he
warranty card must be endorsed by the Authorized Distributor at the point of sale.
If repair or adjustment is necessary and has not been the result of ab use or misuse
within the designated period, please return – freight pre-paid – and c orrection will
be made without charge. Thermo Scientific/ Eutech will determine if the product
problem is due to deviations or customer misuse.
Out of warranty products will be repaired on a charged basis.
Exclusions
The warranty on your instrument shall not apply to defects resulting from:
• Improper or inadequate maintenance by customer
• Unauthorized modification or misuse
• Operation outside of the environment specifications of the products
9.2 Return of Goods
Authorization must be obtained from our Customer Service Department or
authorized distributor before returning items for any reason. A “Return Goods
Authorization” (RGA) form is available through our authorized distributor. Please
include data regarding the reason the items are to be returned. For your protection,
items must be carefully packed to prevent damage in shipm ent and insured against
possible damage or loss. Thermo Scientific will not be responsible for damage
resulting from careless or insufficient packing. A restocking charge will be ma de on
all unauthorized returns.
NOTE: Thermo Scientific reserves the right to make improvements in design,
construction, and appearance of products without notice.
9.3 Guidelines for Returning Unit for Repair
Use the original packaging material if possible when shipping the unit for repair.
Otherwise wrap it with bubble pack and use a corrugated box for additional
- 36 -
protection. Include a brief description of any faults suspected for the c onvenie nce of
Customer Service Dept., if possible.
9.4 Maintenance and Cleaning
Maintenance
The Alpha pH 550 Monitor contains no user repairable components. Please
contact your authorized distributor if there is any problem with the unit.
Cleaning
To remove dust, dirt and spots, the external surfaces of the pH Monitor may be
wiped with a damp, lint-free cloth. A mild household cleaner can also be used if
necessary.
- 37 -
10 APPENDICES
10.1 Appendix 1 – pH Buffer Values at Various Temperatures
The following table shows the various pH values at different temperature of the
solution during calibration.
Temperature
(oC)
0 4.01 6.98 7.12 9.47 10.32
5 4.01 6.95 7.09 9.38 10.25
10 4.00 6.92 7.06 9.32 10.18
15 4.00 6.90 7.04 9.27 10.12
20 4.00 6.88 7.02 9.22 10.06
25 4.01 6.86 7.00 9.18 10.01
30 4.01 6.85 6.99 9.14 9.97
35 4.02 6.84 6.98 9.10 9.93
40 4.03 6.84 6.97 9.07 9.89
45 4.04 6.83 6.97 9.04 9.86
50 4.06 6.83 6.97 9.01 9.83
55 4.08 6.83 6.97 8.99 9.81
60 4.10 6.84 6.98 8.96 9.79
70 4.12 6.85 6.99 8.92 9.76
80 4.16 6.86 7.00 8.89 9.74
90 4.20 6.88 7.02 8.85 9.73
pH 4.01 pH 6.86 pH 7.00 pH 9.18 pH 10.01
10.2 Appendix 2 – Abbreviations Used in LCD
Abbreviation Description
ASy
AtC
bUFF
CAL
C.ºC
CdAt
Asymmetrical mode
Automatic Temperature Compensation
Buffer
Calibration
Calibration temperature
Electrode properties
- 38 -
CnFg
dEF
FCt
OFS
Or
OrP
P.ºC
PH
Set
Sy
tyP
Ur
Configuration
Default values
Factory (defaults)
Offset
Reading is over range
Oxidation Reduction Potential
Process temperature
pH
Setting
Symmetrical mode
Type
Reading is under range
- 39 -
Water Analysis Instruments
North America
166 Cummings Center
Beverly, MA 01915 USA
Toll Free: 1-800-225-1480
Tel: 1-978-232-6000
Dom. Fax: 1-978-232-6015
Int’l Fax: 978-232-6031
Europe
P.O. Box 254, 3860 AG Nijkerk
Wallerstraat 125K, 3862 CN Nijkerk,
Netherlands
Tel: (31) 033-2463887
Fax: (31) 033-2460832
Asia Pacific
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#04-16/24, Singapore 139949
Tel: 65-6778-6876
Fax: 65-6773-0836
www.thermo.com/process
© 2009 Thermo Fisher Scientific Inc.
All rights reserved. Thermo Fisher Scientific Inc.
68X216869 Rev 3
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