EUTECH INSTRUMENTS ALPHA PH 1000 PHORP CONTROLLERTRANSMITTER User manual

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Instruction Manual
alpha-pH1000
pH and ORP Controller/Transmitter
68X216801 rev 1.1
07/02

Instruction Manual alpha-pH 1000
Preface
This manual serves to explain the use of the αlpha-pH1000 series pH/ORP controller/transmitter. 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 as many
anticipated applications of the αlpha-pH1000 pH/ORP controller/transmitter. 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 Pte Ltd.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to improper
use of the instrument.
Copyright 1997 Eutech Instruments Pte Ltd. Revised in July 2002.
All rights reserved.

Instruction Manual alpha-pH 1000
Safety Information
The Eutech Controller/ Transmitter shall be installed and operated only in the manner specified in the
Instruction manual. Only skilled, trained or authorized person should carry out installation, setup and operation
of the instrument.
Before powering up the unit, make sure that power source it is connected to, is as specified in the top label.
Failure to do so may result in a permanent damage to the unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that the power to the unit is off
and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those as specified in the manual.

Instruction Manual alpha-pH 1000
TABLE OF CONTENTS
1INTRODUCTION 5
1.1 Description of Unit 5
1.2 Applications 5
2ASSEMBLY AND INSTALLATION 6
2.1 Measurement and Control System 6
2.2 Unit Dimensions 6
3ELECTRICAL CONNECTION 7
3.1 Connection Diagram 7
3.2 Back Panel 9
4OVERVIEW 10
4.1 Keypad and Display 10
4.2 Function Groups 11
4.3 Control Concept 12
5MEASUREMENT 13
5.1 Display in Measurement mode 13
5.2 Security Codes 13
6CALIBRATION MODE 15
6.1 pH Calibration 15
6.2 ORP – mV Calibration 16
6.3 ORP -% Calibration 17
7ADVANCED SET-UP MODE 18
7.1 Electrode Offset (OFS) sub-function 18
7.2 Setting temperature (Set oC) sub-function 18
7.3 Control Relay A/Control Relay B (SP1/SP2) sub-function 20
7.4 Controller (Cntr) sub-function 22
7.5 Current Output (rng) sub-function 24
7.6 Configuration (ConF) sub-function 25
7.7 Calibration (CAL) sub-function 28
8AUTO/MANUAL MODE 29
8.1 Auto mode (mode after switch-on) 29
8.2 Manual mode 29
9TECHNICAL SPECIFICATIONS 30
10 ACCESSORIES 32
11 GENERAL INFORMATION 33
11.1 Warranty 33
11.2 Packaging 33
11.3 Return of Goods 33
11.4 Guidelines for Returning Unit for Repair 33
12 APPENDICES 34
12.1 Appendix 1 34
12.2 Appendix 2 35
12.3 Appendix 3 36
12.4 Appendix 4 37

Instruction Manual alpha-pH 1000
5
1 INTRODUCTION
1.1 Description of Unit
Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series pH/ORP process controllers. This unit is used
for measuring either pH or ORP parameter one at a time, and the operational mode is switchable from the
menu. You can use this unit to measure pH or ORP with proportional or limit control. This controller has
many user-friendly and safety features which include:
•Menu-driven program that simplifies set-up
•Built-in memory backup to ensure that calibration and other information are not erased if power
supply fails
•Push-button two-point calibration and electrode offset adjustment from the keypad
•Automatic temperature compensation (ATC)
•Manual temperature compensation setting without the ATC probe, with independent setting for
calibration and process temperature
•0 to 2000 second time delay adjustment on all relays – minimise false alarms
•Separately adjustable high and low set point hysteresis (dead bands) prevent chattering of relays
around the set points
•Asymmetrical/symmetrical input for pH/ORP mode of operation
•Three control modes: limit, proportional pulse length or proportional pulse frequency
•Large dual display LCD for easy reading with clear multiple annunciators, alarm status, operational
and error messages
•Two switching contacts as set-point triggering relays and an alarm output relay
•A third relay that can be set up to perform either Alarm or Wash function
•When set to work as Alarm relay, alerts you to set points exceeded for a set-point limits for certain
time and if the Pt100/Pt1000 wires are broken or disconnected during the ATC function
•Programmable duration and frequency in the Wash mode
•Hold function freezes output current (0/4...20mA) and releases control relays
•LED indicators signal control activities to monitor controller status from a distance
•Protection against electromagnetic interference - galvanically isolated 0/4..20mA output provides
safety for data logging and control purposes
•Choice of 7 buffers from USA or NIST standards
1.2 Applications
Use this controller in panel mounted enclosures for applications such as water treatment and monitoring,
galvanic-decontamination, chemical processing food processing, clean or waste water control and
neutralisation process.

Instruction Manual alpha-pH 1000
6
2 ASSEMBLY AND INSTALLATION
2.1 Measurement and Control System
A typical measurement system consists of:
•a pH/ORP process controller
•a pH/ORP combination electrode with integrated or separate temperature sensor Pt 100/1000,
•an immersion, flow or process assembly with or without a potential matching pin (PMP)
•a final control element such as pump or valve
•a recorder and
•an appropriate pH or ORP measurement cable.
2.2 Unit Dimensions
The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front).
max. 175
max. 45
Mounting Cut-Out
Flat
G
asket
(
1
mm
)
(To be Inserted By Customer)
Note: The Taped Corners Have to Be On Top
92
32
56
96
92 + 0.5
92 + 0.5
Power Mains
(220/110 VAC)
Flow Assembly
Measurement Cable
Process Assembly
with El
e
c
tr
o
d
e
Chart Recorde
r
pH Controller
ALARM
REL A
REL B
ESC
CAL
ENTER
REL A
AUTO
REL B
MANU
7.02
25.0
pH
o C
ATC
MEAS
alpha-pH1000

Instruction Manual alpha-pH 1000
7
3 ELECTRICAL CONNECTION
3.1 Connection Diagram
Caution: Ensure electrical mains is disconnected before proceeding.
Signal OutputHold Input
Relay B
Relay A
Power Mains
pH
mA
Alarm/Wash
-
+
PE
/
S
PEAC: NL
1
25
4
36
78 9 10 11 12 13 14 15 17
15 16
* ) indicated contact positions are for currentless conditions
Pt 100
Potential Matching Pin (PMP) Signal Input pH
/
ORP
S/
V
PE/S
pH
18 19 20 21 22
S/S/
BNC

Instruction Manual alpha-pH 1000
8
Symmetrical high-impedance
connections
Asymmetrical connections
Measuring Cable
pH Combination
Electrode
Te m p . pH
BNC
0/PA
PE NLS
22 21
1
2
320 19 18
Potential
Matching Pin (PM)
S

Instruction Manual alpha-pH 1000
9
3.2 Back Panel
Caution: Ensure electrical mains is disconnected before proceeding.
The back panel consists of two connectors. The first connector is the 17-way PCB edge connector and the
other is the 5-way connector.
Connection for the 17-way screw terminals (from left to right):
1. AC mains live wire 10. Alarm/Wash relay working position (NO)
2. AC mains neutral wire 11. Alarm/Wash relay common
3. AC mains protective earth wire 12. Alarm/Wash relay resting position (NC)
4. Low set relay resting position (NC) 13. Hold function switch terminal 1
5. Low set relay common 14. Hold function switch terminal 2
6. Low set relay working position (NO) 15. No connection
7. High set relay resting position (NC) 16. 0/4 - 20 mA for -ve connection
8. High set relay common 17. 0/4 - 20 mA for +ve connection
9. High set relay working position (NO)
Connections for the 5-way screw terminals:
18. Pt100/Pt1000 lead 1 terminal
19. Pt100/Pt1000 sense lead terminal
20. Pt100/Pt1000 lead 2 terminal
Note: If using a two-wire RTD, short terminal 19 to terminal 18.
Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for
directions on switching the RTD type.
21. pH/ORP (potential matching pin)
21. pH/ORP (shield)
0V
/
Pt100
/
RELAY A
L N PE
100mA (F)
FUSE 250VAC
HOLD
A
LARM / WASHRELAY B
Pt1000
PAL
S/
NC
-
+
IMPORTANT: The Alarm relay functions as an “Active Low” device i.e. it switches OFF under Alarm
condition. Therefore the Alarm display device should be connected to the ‘NC’ contacts of the relay (11
and 12). In the Wash mode, the relay works on a positive mode. Therefore, the Wash device should be
connected to the contacts 10 and 11.

Instruction Manual alpha-pH 1000
10
4 OVERVIEW
4.1 Keypad and Display
4.1.1 Keypad
CAL
•Perform rapid 2-point calibration
•Allows entry to Set up mode
•Select individual functions within the function group of Set up mode
•Store input data in the Set up mode
•Start calibration in the calibration mode
•Select various function groups in the Set up mode.
•Set parameters and numerical values in sub functions of Set up mode
If pressed continuously, the setting speed increases
•Control the relays in the MANUAL function
•Return to the Measurement mode when both keys are pressed together
•Switch between AUTO and MANUAL relay operation using a code
•Display limit set-point values for the switch contacts in AUTO relay operation mode
•Switch between RELAY A and RELAY B in MANUAL relay operation mode
4.1.2 Display
The LCD display features two numerical displays that show status messages and measured values for easy,
quick reference. The display provides short-text information for setting parameters and configuration.
7.00
25.0 ATC
SETUP
HOLD
CAL
MEAS CON
READY pH
ERR oC
•MEAS: Measurement mode
•SETUP: Set-up mode of function groups
•CAL: Calibration mode of pH/ORP and temperature
•READY: Comes on after a successful calibration
•HOLD: Relay position and current output are frozen
•ATC: Comes on in the ATC mode. Disappears in the
Manual temperature Compensation mode.
“ATC” flashes if the temperature probe is faulty in its ATC
mode
•ERR: Error or alarm indicator
•Display for RELAY A/B. Green LED indicates measured value within limit while
RED LED indicates measured value outside limit.
•Alarm display if limit value overshoot or the ATC probe fails; with ERR annunciator
appears on the display. Wash display if cleaning cycle is on.

Instruction Manual alpha-pH 1000
11
4.2 Function Groups
The main function and sub-function groups are organised in a matrix format for configuration and selection of
parameters. The main function groups are:
1) Offset adjustment (OFS)
2) Temperature Measurement / compensation settings (Set oC)
3) Control relay 1 configuration (SP1)
4) Control relay 2 configuration (SP2)
5) Control type (Cntr)
6) Current output (rng)
7) Configuration (ConF)
8) Calibration (CAL pH)
The set-up parameters can be viewed or changed by entering a security code. See Section 5.2 for security
code information.
4.2.1 How to view operating parameters without access to change them:
a) Press the ENTER key. The display will prompt the user to enter a
security code (S.Cd). Leave the security code at “000” (do not enter a
security code).
b) Press ENTER key again. This allows you only to view (not change) any
sub-functions’ settings.
c) Press the ▲or ▼key to scroll through the sub-functions.
d) Press the ENTER key at a particular sub-function to view in detail.
e) Press the ENTER key to return to the sub-function menu.
f) Press the ▲and ▼keys simultaneously (as an Escape key) at any time to return to the Measurement
mode.
Note: To simplify operations, the controller will not display parameters that are not relevant to a particular sub-
function. For example: If the user set the controller for Limit control, it will not display pulse length/frequency
settings.
000
S.Cd
SETUP
HOLD
OFS
SETUP
HOLD SEt
oC
SETUP
HOLD SP1
SETUP
HOLD SP2
SETUP
HOLD
ConF
SETUP
HOLD rng
SETUP
HOLD Cntr
SETUP
HOLD
CAL
pH
SETUP
HOLD

Instruction Manual alpha-pH 1000
12
4.3 Control Concept
The main function and sub-function groups are organised in a matrix format as shown below. These functions
can be accessed via the front keypad for configuration and selection of parameters.
CALIBRATION
MEASURE
CODE
OFFSET
SET C
o
SET-POINT 1
SET-POINT 2
CONTROLLER
MEASUREMENT
RANGE
CONFIGURATION
Set Offset
Switch On/Off ATC
Set value 1
Set value 2
Controller type
Current output
0..20 / 4..20 mA
pH / ORP Symm.
/ Asymmetrical
CLn
ALr
Process temp.
(MTC)
Calibrate 1st value
MIN / MAX Function
MIN / MAX Function
N.O/N.C. Contact
pH / ORP
at 0/4 mA
Alarm delay
00
Intv
Calibrate 2nd value
Calib. temp.
(MTC)
Hysteresis 1
Hysteresis 2
Proportional
range XP
pH / ORP
at 20 mA
Alarm contact
cont./wiper contact
1000
Dur
Display zero point
and slope
Calibrate Pt100
Pick-up delay
contact 1
Pick-up delay
contact 2
Cycle time bzw.
max. frequency
Electrode type
Glass/Antimony
Dropout delay
contact 1
Dropout delay
contact 2
Reset to factory
default settings
The controller offers two levels of password protection: (1) for direct access to calibration function and (2) for
setting or editing specific controller parameters or functions in the SETUP mode to suit individual requirements.
Note: The passwords are not user-defined and have been set by factory. It is very important to keep these
passwords strictly confidential to avoid unauthorised tampering of the system at all times.
Note: If the user reads parameters only, the controller automatically reverts to Measurement mode if no key is
pressed for 30 seconds.

Instruction Manual alpha-pH 1000
13
5 MEASUREMENT
5.1 Display in Measurement mode
When the controller is initially powered on, it automatically enters into the Measurement mode after the large
dual LCD displays all segments briefly.
The upper display shows the measured pH or ORP value, while the lower display shows either the temperature
value if the controller is set for pH measurement or “OrP” if it is set for ORP measurement.
Annunciators at the right side of the display indicate whether the controller is set for pH or mV measurement. If
the controller is set for ORP % measurement, neither the pH or mV indicator displays.
Similarly annunciators or icons at the top or left side of the display shows the current status of controller, e.g.
“MEAS”, “SETUP”, “CAL”, “READY”, etc. In addition, error messages also guide the user in time of any faulty
conditions as indicated by “ERR” or icons flashing.
5.1.1 Check electrode performance
To read current electrode slope and offset values without changing them:
1) Press the CAL key followed by the ENTER key without adjusting the security code (leave code at “000”).
The upper display shows electrode slope. The lower display reading shows the pH reading at 0 mV.
Note: If security code is changed to a value other than “000”, press the ENTER key will return to
Measurement mode, without displaying electrode information.
2) Press the ENTER key a second time to return to Measurement mode.
5.1.1 Checking set points
To read current set point values without changing them:
1) Press the RELAY Selection (Rel A/Rel B) key. The upper display shows the set point for Relay A; the
lower display shows “SP1”.
2) After two seconds the upper display shows the set-point value for Relay B; the lower display shows “SP2”.
3) After an additional two seconds, the controller returns to its Measurement mode.
5.2 Security Codes
This controller has two levels of security protection with separate security codes. The first level allows entry
into the Calibration mode: security code = 11; the second allows entry into the SETUP mode: security code =
22.
The security codes protects the controller from unauthorised tampering of its current setting. The parameters
cannot be changed unless the security code is entered.

Instruction Manual alpha-pH 1000
14
5.2.1 How to enter and change parameters in Calibration mode
1) Press the CAL key. The upper display shows “000” and the lower
display shows “C.Cd” to prompt the user to enter the Calibration security
code.
2) Press the ▲or ▼key to scroll upper display to Calibration security
code “11”.
3) Press the ENTER key. If configured for pH control, the display shows
“CAL pH”. If configured for ORP control, the display shows “CAL OrP”.
4) Press ENTER key again to begin calibration. Refer to Section 6 for full details on calibration.
5) Press the ▲and ▼keys simultaneously (escape) to return to the Measurement mode.
NOTE: To view (not change) the SETUP parameters, push the ENTER key when the security code reads
“000”.
5.2.1.1 Clearing the Calibration security code from the display
The calibration security code automatically resets from “11” to “000” after you return to Measurement mode, so
you do not need to clear the security code from the display.
5.2.2 How to enter and change parameters in Advanced Setup mode
1) Press the ENTER key once. The upper display shows “000” and the lower display shows “S.Cd” to prompt
you to enter the Advanced Setup security code.
2) Press the ▲or ▼key to scroll the display to Setup security code “22”.
3) Press the ENTER key.
4) If configured for pH control, the upper display reads “OFS”.
5) If configured for ORP control, the upper display reads “SP1”.
NOTE: Pressing the ENTER key at a value other than “22” causes the controller to revert to the
Measurement mode.
6) You are now in the Advanced Setup mode. See Section 7 for complete instructions. To return to
Measurement mode, press the ▲and ▼keys simultaneously (escape).
NOTE: If you want to view (not change) set up parameters, push the ENTER key when the security code
reads “000”.
5.2.2.1 Clearing the Advanced Setup security code from the display
After you have entered the security code and returned to the Measurement mode, the security code “22” still
appears on the display whenever you press the ENTER key. To conceal the security code, you must manually
reset the code. To clear the Advanced Setup security code from the display:
1) Press the ENTER key in the Measurement mode.
2) Set to any security code (not 11 or 22) and complete by pressing ENTER.
NOTE: When you enter the Calibration mode with code “11” or Advanced Setup mode with security code
“22”, the unit automatically enters into the HOLD mode until you return back to Measurement mode. The
HOLD annunciator is displayed at the upper left of the display. While on HOLD, the current output is frozen
and set point relays are deactivated.
000
C.Cd
SETUP
HOLD

Instruction Manual alpha-pH 1000
15
6 CALIBRATION MODE
You can reach the Calibration mode directly from the Measurement mode by pressing the CAL key and
entering the Calibration security code. You can also reach the Calibration mode from the Advanced Setup
mode.
6.1 pH Calibration
This unit features 7 preset buffer values (1.01, 4.01, 6.86, 7.00, 9.00, 9.18 and 10.01) for
fast auto calibration. When you calibrate this instrument, you need a standard pH buffer
solution that matches one of these values.
1) Enter Calibration mode. While in the Measurement mode,
push the CAL key and scroll to Calibration code “11”. Push
the ENTER key again. The upper and lower display reads
“CAL pH”.
NOTE: If the display read “CAL OrP”, see section 7.6.2 for
procedures on how to switch from ORP to pH readings.
2) Press the ENTER key again to begin calibration. The “CAL”
indicator appears at the top of display and the buffer indicator
appears in the bottom left corner of the display. The upper
display shows your present uncalibrated reading. The lower
display indicates one of the two buffer values used for the first
point calibration. It would either be 7.00 or 6.86.
3) Press the ▲or ▼key to scroll the lower display to the buffer
value that matches your buffer solution.
4) Make sure the electrode is in the buffer solution. In ATC, you
must also immerse the temperature probe in the buffer
solution. Likewise for symmetrical mode, you must also
immerse the potential matching pin in the buffer.
5) Press the ENTER key to confirm the buffer value and start
the calibration of its first point. The electrode indicator and
CAL indicator both flash. The controller automatically adjusts
the reading to match the buffer value.
6) The lower display will now show its next lower ‘pH’ buffer. Use
▲and ▼keys to select its second buffer from one of the 5
preset values. Remove the electrode from the first buffer,
wash and then immerse into the second buffer, Once the
upper display stabilises press the ENTER key, the electrode
and CAL indicator will flash. The controller adjusts the reading
to the buffer.
7) After calibrating to a second buffer value, this controller will
automatically display slope in the upper display and zero point in the lower display. You can view the
values for zero point and slope without calibration --- see section 5.1.2 for instruction The zero point and
slope are re-determined after each calibration.
8) Press the ENTER key. If you entered the calibration mode using the CAL key, the controller will return to
the Measurement mode. If you entered the calibration mode from the Advanced Set-up mode, the
controller will return to the sub-function menu.
CAL
PH
SETUP
HOLD
HOLD
59.0 mV
7.00 pH
6.96 pH
7.00 pH
CAL
4.02 pH
4.00 pH
SETUP
HOLD
CAL
READY
HOLD
CAL

Instruction Manual alpha-pH 1000
16
Note: If there is a calibration error, the controller displays “ERR”. If this happens, push both the ▲and ▼
keys (escape) to restart the calibration beginning from step 1.
Note: When calibrating with manual temperature compensation, the controller automatically changes from
the preset process temperature to the calibration temperature. After leaving the Calibration mode, the
controller switches back to process temperature (for setting the calibration temperature and the process
temperature, see section 7.2.3).
6.2 ORP – mV Calibration
This mode allows one-point calibration.
1) Enter Calibration mode. While in Measurement mode, push
the CAL key and scroll to Calibration Code “11”. Push the
ENTER key. The upper and lower display reads “CAL OrP”.
Note: If the upper and lower display read “CAL PH”, see section
7.6.2 for procedures on how to switch from PH to ORP mV
readings.
2) Place sensor in the ORP solution.
3) Press the ENTER key to begin calibration. The “CAL”
indicator appears on the display. The upper display shows the
current mV output of the electrode without any offset
adjustment.
4) Press the ▲or ▼key to match the mV value to your exact
reading.
5) To confirm, press the ENTER key. The controller calculates
the correction factor and returns to the Measurement mode.
CAL
OrP
SETUP
HOLD
226 mV
C
HOLD
CAL

Instruction Manual alpha-pH 1000
17
6.3 ORP -% Calibration
The ORP % mode allows you to calibrate at two points: a low concentration sample (20%) and a high
concentration sample (80%).
To calibrate the controller for ORP %:
1) Enter Calibration mode. While in Measurement mode, push
the CAL key and scroll to Calibration Code “11”. Push the
ENTER key. The upper and lower display reads “CAL OrP”.
2) Note: If the upper and lower display read “CAL PH”, see
section 7.6.2 for procedures on how to switch from PH to
ORP mV readings.
3) Press the ENTER key to begin calibration. The “CAL”
indicator appears on the display. The upper display shows
“80”. The lower display shows “C1” (= calibrated value 80%).
4) Place sensor in the high concentration sample (relative value
of 80%).
5) Press the ENTER key to confirm the value. The electrode
indicator and CAL indicator flash. The unit automatically
adjusts its reading to match the solution value.
6) The display will now show ‘20’ and “C2’. Remove the
electrode from the first standard, wash it well and then
immerse it in the 20% standard. When the display stabilises,
press the ENTER key. The ‘CAL’ indicator flashes and the
controller adjusts its display to the 20% relative value and
exits to the Measurement mode.
Note: If there is a calibration error, the controller displays “ERR”, and it will not automatically return to
Measurement mode. If this happens, push the ▲and ▼keys simultaneously (escape) to restart the
calibration beginning from step 1.
Note: If you stop calibration after entering the first value, or if calibration is defective, the controller will use
its original calibration data.
CAL
OrP
SETUP
HOLD
80
C.1
HOLD
CAL
20
C.2
HOLD
CAL

Instruction Manual alpha-pH 1000
18
7 ADVANCED SET-UP MODE
7.1 Electrode Offset (OFS) sub-function
You can perform electrode offset only in the pH mode. This mode allows you to change the offset parameter to
make reading corrections without removing the electrode from the control system. You can make adjustments
of up to +/- 120 mV.
The controller will add or subtract the value from the measured pH and display the correct value. However, if
you need to offset the value beyond the average offset you would expect in your application type, consider a
full calibration or even electrode replacement.
1) Pull a sample from the system. Record the controller’s pH reading at the time you take the sample.
2) Measure the pH of your sample using a calibrated pH tester, hand-held meter, or bench meter. Record the
correct pH value.
3) Enter Advanced set-up mode. Push the ENTER key and scroll to Advanced Set-up security code “22”.
Push the ENTER key again.
4) Press the ▲or ▼key to scroll until the upper display shows OFS.
5) Press the ENTER key. The SETUP annunciator appears at the top of the display. The lower display
shows the current measured pH value. The upper display shows the current offset value.
6) Press the ▲or ▼key until the pH value coincides with the correct pH value noted in Step 2. As the ▲
and ▼keys is pressed to adjust the pH value, you will see that the ‘offset’ value in its upper display also
changes.
7) Press the ENTER key to enter the offset value.
Note: The offset value is reset during full calibration. See section 6 for full calibration instructions.
Note: The offset parameter is blanked out during ORP operation.
7.2 Setting temperature (Set oC) sub-function
7.2.1 Selecting automatic or manual temperature compensation
1) Enter Advanced Set-up mode. Push the ENTER key and scroll to
Advanced Set-up security code “22”. Push the ENTER key again.
2) Press the ▲or ▼key to scroll until the upper display shows “Set
oC”.
3) Press the ENTER key. The lower display shows “Atc”; the upper
display shows “on” or “oFF” depending on whether or not ATC is
selected.
4) Press the ▲or ▼key to toggle between ATC on and off.
5) Proceed with additional Advanced Set-up procedures (press ENTER
again) or return to Measurement mode by pressing the ▲and ▼
keys (escape) simultaneously.
HOLD
SETUP
SEt
oC
SETUP
HOLD
HOLD
oFF
Atc
on
A
tc
SETUP

Instruction Manual alpha-pH 1000
19
7.2.2 Temperature calibration (ATC mode only)
1) Select “ATC on” as described above in Section 7.2.1.
2) Press the ENTER key. The upper display indicates the current
temperature offset. The current measured temperature is shown in
the lower display.
3) Compare the current measured temperature on the controller
display to a thermometer known to be accurate. Note down the
correct temperature value.
4) Press the ▲or ▼key to scroll the lower display to match the
correct value. The upper display will now show the offset value. You
can offset temperature up to +/- 5oC.
5) Press the ENTER key to confirm your selection.
6) Continue with additional Advanced Set-up procedures, or return to
the Measurement mode by pressing the ▲and ▼keys (escape)
simultaneously.
7.2.3 Setting manual temperature compensation
Note: This parameter is blanked out when the controller is set for ATC
operation.
For manual temperature compensation, you can set two different
temperatures: process and calibration. This allows calibration at a
temperature other than your process temperature. Example: setting a
calibration temperature of 25oC lets you calibrate using standard buffer
solutions at 25oC, even if your process temperature is a different
temperature.
1) Select “ATC oFF” as described above in section 7.2.1
2) Press the ENTER key. The upper display shows the current
process temperature and the lower display shows “P.oC” to
indicate process temperature.
3) Press the ▲or ▼key to adjust the process temperature value.
You can adjust the value from –9.9 to 125oC.
4) After you set the process temperature value, press the ENTER
key. The upper display shows the current calibration temperature
and the lower display shows “C.oC” to indicate calibration
temperature.
5) Press the ▲or ▼key to adjust the calibration temperature value. You can adjust this value from –9.9 to
125oC.
6) Press the ENTER key to confirm your selection.
7) Continue with additional Advanced Set-up procedures, or return to Measurement mode by pressing the
▲and ▼keys (escape) simultaneously.
0.0
25.0 ATC
SETUP
HOLD
oC
on
A
tc
SETUP
HOLD
25.0
C.C
SETUP
HOLD
oFF
A
tc
SETUP
HOLD
25.0
P.C
SETUP
HOLD

Instruction Manual alpha-pH 1000
20
7.3 Control Relay A/Control Relay B (SP1/SP2) sub-function
The SP1 option sets the operating parameters for Relay A; the SP2 option sets the operating parameters for
relay B. Since these groups have the same set-up parameters, they are described together.
7.3.1 Entering the Set point 1 (Set point 2) sub-function
1) Enter Advanced Set-up mode. Push the ENTER key and scroll to
Advanced Set-up security code “22”. Push the ENTER key again.
2) Press the ▲or ▼key to scroll until the upper display shows SP1
(SP2).
7.3.2 Selecting the set point values
This lets you choose the value that will cause your controller to activate
(i.e. pH 9.0).
1) Follow directions in 7.3.1 to enter Control Relay mode. If you are
in this mode, skip to step 2.
2) Press the ENTER key. The upper display shows the current set
point value and the lower display shows SP1 (SP2).
3) Press the ▲or ▼key to enter your value for Set point 1 (Set
point 2). Your controller will activate at the value you select.
4) Press the ENTER key to confirm your selection.
5) Proceed to 7.3.3 step 3, or return to Measurement mode by
pressing the ▲and ▼keys simultaneously (escape).
7.3.3 Choosing High or Low set points
Select a low set point to activate controller when the pH/ORP value undershoots the low set point; select a high
set point to activate controller when the value overshoots the high set point. Using both SP1 and SP2, you can
select lo/lo, lo/hi, hi/lo, or hi/hi set points.
1) Follow directions in 7.3.1 to enter Control Relay mode.
2) Press the ENTER key. Scroll with the ▲or ▼key until the upper display shows Lo or Hi (for low or high
set point) and the lower display shows SP1 (SP2).
3) Press the ▲or ▼key to select low (lo) or high (hi) set point for SP1 (SP2).
4) Press the ENTER key to confirm your selection.
5) Proceed to 7.3.4 step 3, or return Measurement mode by pressing the ▲and ▼keys simultaneously
(escape).
7.3.4 Selecting a hysteresis (dead band) value
Hysteresis prevents rapid contact switching if your value is fluctuating near the set point. It does this by
overshooting the set point value to a specified hysteresis value. You can set the hysteresis value from 0.1 to
1.0 pH, 10 to 100mV or 1 to 10%.
Example: You have set your high set point at pH 9.0 and your hysteresis limit value at pH 0.5. If your measured
value overshoots the high set point pH 9.0, the controller’s relay activates, which in turn activates an external
devices such as a pump or valve. The actions of the external device will cause the solution’s pH to drop. When
the pH drops to 8.5 pH, the relay and hence the pump will switch off.
SP1
SETUP
HOLD
Lo
SP1
SETUP
HOLD
4.00 pH
SP1
SETUP
HOLD