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Instruction Manual
αlpha-pH2000D
pH and ORP Controller/Transmitter
Technolo
adeEa
68X216855 Rev 1 12/04
Preface
This manual serves to explain the use of the αlpha-pH2000D 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-pH2000D 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.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to
improper use of the instrument.
Copyright ©2004 All rights reserved.
Eutech Instruments Pte Ltd.
Rev 1 12/04
Safety Information
The 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.
The degree of protection against electric shock will be achieved only by observance of the
corresponding installation rules.
TABLE OF CONTENTS
1 INTRODUCTION....................................................................................................................................... 1
1.1 AT THE VERY BEGINNING...................................................................................................................... 1
1.2 INTENDED USE ...................................................................................................................................... 1
1.3 SAFETY INSTRUCTIONS ......................................................................................................................... 2
1.4 PUTTING OUT OF SERVICE / CORRECT DISPOSAL OF THE UNIT............................................................... 2
2 PRODUCT DESCRIPTION....................................................................................................................... 3
2.1 DESCRIPTION OF UNIT........................................................................................................................... 3
2.2 MEASUREMENT AND CONTROL SYSTEM................................................................................................ 4
2.3 UNIT OVERVIEW ................................................................................................................................... 5
2.3.1 Display Overview............................................................................................................................ 6
2.3.2 Key functions...................................................................................................................................6
2.3.3 LED indicators................................................................................................................................ 7
2.3.4 Security codes.................................................................................................................................. 7
2.3.5 Menu overview................................................................................................................................ 8
3 ASSEMBLY AND INSTALLATION........................................................................................................9
3.1 MOUNTING THE UNIT ............................................................................................................................ 9
3.2 CONNECTION DIAGRAM...................................................................................................................... 10
4 NORMAL OPERATION.......................................................................................................................... 12
4.1 MEASUREMENT MODE........................................................................................................................ 12
5 CALIBRATION MODE........................................................................................................................... 13
5.1 ENTERING CALIBRATION MODE .......................................................................................................... 13
5.2 PH CALIBRATION................................................................................................................................14
5.3 ORP-MV CALIBRATION...................................................................................................................... 16
5.4 ORP -% CALIBRATION ....................................................................................................................... 16
5.5 VIEW ACTUAL ZERO AND SLOPE.......................................................................................................... 17
6 SETUP MODE........................................................................................................................................... 18
6.1 ENTER SETUP MODE............................................................................................................................ 18
6.2 ELECTRODE OFFSET (OFS) SUB-FUNCTION ........................................................................................ 19
6.3 SETTING TEMPERATURE (SET °C°F) SUB-FUNCTION ........................................................................... 20
6.4 CONTROL RELAY A / RELAY B (SP1/SP2) SUB-FUNCTION ................................................................. 21
6.5 CONTROLLER (CNTR) SUB-FUNCTION ............................................................................................... 23
6.6 CURRENT OUTPUT 1 SUB-FUNCTION ................................................................................................... 26
6.7 CURRENT OUTPUT 2 SUB-FUNCTION ................................................................................................... 27
6.8 WASH RELAY (WASH) SUB-FUNCTION .............................................................................................. 28
6.9 CONFIGURATION (CNFG) SUB-FUNCTION .......................................................................................... 29
6.10 CALIBRATION (CAL) SUB-FUNCTION.................................................................................................. 30
7 RELAY MODES ....................................................................................................................................... 31
7.1 VIEW RELAY SET POINTS..................................................................................................................... 31
7.2 MANUAL RELAY MODE ....................................................................................................................... 32
8 TECHNICAL SPECIFICATIONS.......................................................................................................... 33
8.1 GENERAL SPECIFICATION ................................................................................................................... 33
8.2 SET-POINT AND CONTROL FUNCTION – RELAY 1 & RELAY 2.............................................................. 33
8.3 WASH FUNCTION – WASH RELAY ...................................................................................................... 34
8.4 ALARM FUNCTION – ALARM RELAY .................................................................................................. 34
8.5 TRANSMITTER FUNCTION ................................................................................................................... 34
8.6 VOLTAGE OUTPUT & HOLD FUNCTION SWITCH ................................................................................. 34
8.7 DISPLAY ............................................................................................................................................. 35
8.8 POWER SUPPLY...................................................................................................................................35
8.9 ELECTRICAL DATA AND CONNECTIONS .............................................................................................. 35
8.10 MECHANICAL SPECIFICATIONS ........................................................................................................... 35
8.11 ELECTROMAGNETIC COMPLIANCE (EMC) SPECIFICATIONS ............................................................... 35
8.12 ENVIRONMENTAL CONDITIONS........................................................................................................... 35
9 ACCESSORIES......................................................................................................................................... 36
9.1 REPLACEMENT UNIT........................................................................................................................... 36
9.2 ASSEMBLY ACCESSORIES ................................................................................................................... 36
10 GENERAL INFORMATION................................................................................................................... 37
10.1 WARRANTY........................................................................................................................................ 37
10.2 PACKAGING / SCOPE OF DELIVERY...................................................................................................... 37
10.3 RETURN OF GOODS.............................................................................................................................. 37
10.4 GUIDELINES FOR RETURNING UNIT FOR REPAIR .................................................................................. 37
10.5 MAINTENANCE AND CLEANING.......................................................................................................... 37
11 APPENDICES ........................................................................................................................................... 38
11.1 APPENDIX 1 – UNIT FUSE AND JUMPER SETTINGS................................................................................ 38
11.2 APPENDIX 2 – PH BUFFER VALUES AT VARIOUS TEMPERATURES ........................................................ 39
11.3 APPENDIX 3 – SIMPLE EXPLANATION ON THE FUNCTION OF HYSTERESIS ............................................ 40
11.4 APPENDIX 4 – GENERAL INSTRUCTIONS CONCERNING CONTROLLER SETTING ................................... 41
11.4.1 Control characteristic of Controllers used as limit value switch ............................................. 41
11.4.2 Control characteristic of P-Controllers as proportional controller......................................... 41
11.4.3 Control characteristic of PI-Controllers as proportional integral controller.......................... 41
11.4.4 Control signal of Pulse length Controllers............................................................................... 42
11.4.5 Control signal of Pulse Frequency Controllers........................................................................ 43
11.5 APPENDIX 5 – ABBREVIATIONS USED IN MENU DISPLAYS................................................................... 44
Instruction Manual αlpha-pH2000D
1 INTRODUCTION
1.1 At the very beginning
We thank you for having purchased the αlpha pH 2000D pH/ORP Controller.
The construction of the pH/ORP Controller 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 work is started with the pH/ORP Transmitter.
This instruction manual identifies safety instructions and additional information by means of
the following symbols:
This symbol draws attention to safety instructions and warnings of
potential danger which, if neglected, could result in injury to persons
and/or damage to property.
This symbol identifies additional information and instructions which, if
neglected, could lead to inefficient operation and possible loss of
production.
The instruction manual must always be stored close at hand, in a place accessible to all
people working with the pH/ORP Controller.
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 us e
The αlpha pH 2000D pH/ORP Controllers 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:
– observing the instructions, notes and requirements set out in this instruction manual.
– observing all local safety regulations concerning safety at work.
– observing all information and warnings in the documentation dealing with the products
used together with the transmitter (housings, sensors, etc.).
– observing the prescribed environmental and operational conditions.
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Instruction Manual αlpha-pH2000D
1.3 Safety instructions
- The αlpha pH 2000D should be installed and operated only by personnel familiar
with the transmitter and who are qualified for such work.
- A defective controller must neither be installed nor put into service.
- The αlpha pH 2000D must only be operated under the specified operating
conditions (see section 8).
- The αlpha pH 2000D must not be repaired by the customer.
- The αlpha pH 2000D must only be opened to replace the unit fuse. This work must
be carried out only by personnel familiar with the transmitter and who are
qualified for such work. Make sure the mains cable is separated from the power
supply before opening the unit.
- No modifications to the αlpha pH 2000D are allowed. The manufacturer/supplier
accepts no responsibility for damage caused by unauthorized modifications. The
risk is borne entirely by the user.
1.4 Putting out of service / Correct disposal of the unit
Putting out of service
• First disconnect the unit from the mains, then undo all electrical connections.
• Remove the unit from the wall / panel.
Correct disposal of the unit
When the transmitter is finally taken out of service, observe the local environmental
regulations for correct disposal or send the transmitter to your local distributor, they will take
care of proper disposal.
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Instruction Manual αlpha-pH2000D
2 PRODUCT DESCRIPTION
2.1 Description of unit
The αlpha pH 2000D is used for measuring pH and temperature values. The pH values can be
measured using industrial differential & combination pH sensors. The temperature values can
be measured using 2-wire / 3-wire NTC300 thermistor. The transmitter is available in a wall
mounting enclosure. The controller / transmitter can be used for applications such as water
treatment and monitoring, galvanic-decontamination, chemical processing, food processing,
clean or wastewater control and neutralization processes.
This transmitter has many user-friendly and safety features which include:
• Push-button for calibration and sensor offset adjustment from the keypad.
• Built-in non-volatile memory to ensure that calibration and other information are not
erased if power supply fails.
• Menu-driven program that simplifies set-up.
• Automatic temperature compensation (ATC).
• Manual temperature compensation setting without the ATC probe, with independent
setting for calibration and process temperature.
• Two galvanically isolated current outputs 0/4...20mA.
• Two switching contacts as set-point relays.
• 0 to 2000 seconds time delay adjustment on all relays – minimizes false alarms.
• Separately adjustable high and low set-point hysteresis (dead bands) prevent chattering
of relays around the set points.
• Three control modes: limit controller, P controller and PI controller (P/PI controller as
pulse length or pulse frequency).
• Large dual display LCD for easy reading with clear multiple annunciators, alarm status,
operational and error messages.
• Separate alarm relay alerting you to set point limits exceeded for a certain time and if the
NTC300 thermistor wires are broken or disconnected during the ATC function.
• Wash relay.
• Hold function to freeze output current (0/4...20mA) and release control relays.
• LED indicators signal control activities to visually monitor transmitter status from a
distance.
• Protection against electromagnetic interference.
• Back lit and UV light protected LC display.
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Instruction Manual αlpha-pH2000D
2.2 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 NTC300
thermistor.
• An appropriate pH or ORP measurement cable
• An immersion, flow or process assembly with or without a potential matching pin (PMP)
• A final control element such as pump or valve
• A chart recorder
αlpha pH 2000D Transmitter
Chart Recorder
Housing and
Sensors
Measurement Cable
0/4 - 20 mA
Power Mains
(80 - 250 VAC)
- 4 -
Instruction Manual αlpha-pH2000D
2.3 Unit overview
Wall mounting version
- 5 -
Instruction Manual αlpha-pH2000D
A
2.3.1 Display Overview
The LC display shows two alpha-numerical fields for parameters and measured values as well
as various mode and status indicators.
SETUP
MEAS
CAL
READY
HOLD
ERR
2.3.2 Key functions
Key Description
O
pH
pH %
C
TC
mV
Mode indicators:
MEAS: measurement mode
SETUP: Set-up mode
CAL: Calibration mode
O
F
Status indicator:
READY: Visible after successful calibration
HOLD: Unit in “HOLD” mode
ATC: Visible in ATC (Automatic Temperature
Compensation) mode. Not visible in the Manual
Temperature Compensation mode. “ATC”
flashes if the temperature probe is faulty in its
ATC mode
ERR: Error indicator
S: Visible in symmetrical measurement mode
Enter Calibration mode (requires access code)
Enter Set-up mode (requires access code)
Access sub functions (parameters) within a function group of Set-up mode
Confirm (store) set-up parameters and numerical values
Start/Confirm calibration in Calibration mode.
Select function group in the Set-up mode.
Set parameters and numerical values (if key is pressed continuously, the setting speed
increases).
Control the relays in MANUAL relay operation.
Returns to “Measurement mode” when both keys are pressed simultaneously.
Display limit values for SP1 and SP2 and settings for wash contact in AUTO relay
operation.
Toggle between RELAY A, RELAY B or Wash relay in MANUAL relay operation
Switch from AUTO to MANUAL relay operation (requires access code)
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Instruction Manual αlpha-pH2000D
2.3.3 LED indicators
Relay indicators
If REL key is pressed the LED (A, B or W) indicates to which Relay (A, B or
Wash) the displayed limit values refer.
Relay mode indicators
Auto LED lights if relay operation is set to automatic mode. Manu LED lights
if relay operation is set to manual mode.
Relay status indicators
This LED lights if limit value is exceeded or the ATC probe fails.
2.3.4 Security codes
The access to Calibration mode, Setup mode and Manual relay operation mode is protected
with security codes. The security codes are set at the factory and cannot be changed by the
user. The following security codes are used:
Security code Mode Description
000 View only mode to view actual settings
This LED lights green if measured value is within the limit for Relay A or
lights red if measured value exceeds limit.
This LED lights green if measured value is within the limit for Relay B or
lights red if measured value exceeds limit.
This LED lights if cleaning cycle is on.
11 Calibration mode to start calibration
22 Setup mode to configure parameters
22
- 7 -
Manual relay operation to switch relay operation mode from
automatic to manual
Instruction Manual αlpha-pH2000D
2.3.5 Menu overview
MEAS
CAL
H
P
°C
ENTER
ENT
CCD “000” = Check calibration parameters (View only mode)
1
CCD “11” = Calibration mode
SCD “000” = Check setup parameters (View only mode)
2
SCD “22” = Setup mode
ENTER
ENT
ENTER
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
OFS
ENT
ENT
ENT
ENT
ENT
ENT
ENT
Offset setting
see section 6.2
Temperature settings
see section 6.3
Relay A (set point 1) settings
see section 6.4
Relay B (set point 2) settings
see section 6.4
Controller settings
see section 6.5
Current output 1 settings
see section 6.6
Current output 2 settings
see section 6.7
SETUP
HOLD
ENT
Wash contact settings
see section 6.8
SETUP
HOLD
SETUP
HOLD
ENT
ENT
Unit settings
see section 6.9
Calibration
see section 5
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Instruction Manual αlpha-pH2000D
3 ASSEMBLY AND INSTALLATION
3.1 Mounting the unit
Wall mounting version
144 [5.67]
144 [5.67]
111.50 [4.39]
27.5 [1.08]
approx. 14 [.55]
21.5 [.85]
66.5 [2.62]
6 [.24]
Max.80
39 [1.54]
78 [3.07]
80 [3.15]
90 [3.54]
84 [3.30]
1-22 [0.03 - 0.87]
Pg13.5 (3 pcs.)
29 [1.14]
Holes for post
mounting (4X)
Holes for wall
mounting (2X)
90 [3.54]
Red Plugs for wall
mounting holes
enclosure (2X)
24 [.94]
For Pg13.5 cable glands
57.8[2.28]
175 [6.88]
Seal gasket
Threaded rod for pane l mounting
Unit:
MM [INCH]
138 [5.43]
138 [5.43]
Cut-out mounting plates for post mounting
175 [6.88]
Transmitter housing for wall mounting: protection class IP 65
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Instruction Manual αlpha-pH2000D
3.2 Connection Diagram
Caution: Ensure electrical mains are disconnected before proceeding.
Connections for wall mounting version
Fuse: 250V 315 mA,
Time Delay
Curren t
250V, 315 mA,
Time Delay
Curren t
OP2
OP1
HOLD
13
14215
17
16
21
18 19 20422 23
1
3
L
N
TEMP
pH
pH
TEMP
SENS
AS
-5V
REF
ME
28
26 27
31
29930
24
25
6 7
5
32 33
12
10
8
11
13
OP2
14
Current
OP1
15
2
N
MP
HOLD
17
16
18 19 2120 23 24 25
3
22
4
6
5
7
V
-5
8 9
TE
SENS TEMP
2926 2827 30 31 32 33
pH
RE
AS
FpHME
10
12
11
Current
1
L
-5V
1. AC mains live wire 18. 12V output Power supply
2. AC mains neutral wire 19. Hold Function
3. AC mains protective earth wire 20. Hold Function
4. Relay A (SP 1) 21. Earth ground
5. Relay A (SP 1) 22. no connection
6. Relay B (SP 2) 23. no connection
7. Relay B (SP 2) 24. no connection
8. Wash relay 25. no connection
9. Wash relay 26. Shield (drain wire)
10. Alarm relay (NC) 27. -5V to differential pH sensor (White wire)
11. Alarm relay common 28. Temperature ground (black wire)
12. Alarm relay (NO) 29. Temperature Sense (Yellow wire)
13. 4-20 mA temperature output, +ve terminal 30. Temperature Input (Yellow wire)
14. 4-20 mA temperature output, -ve terminal (Internally connected by jumper to terminal 29)
15. 4-20 mA pH/ORP output, +ve terminal 31. No connection
16. 4-20 mA pH/ORP output, -ve terminal 32. pH input, Reference (Green wire)
17. 12V output ground 33. pH input, Measure (Red wire)
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 (10 & 11).
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Instruction Manual αlpha-pH2000D
NOTE:
a) Switch or circuit breaker shall be included in the building installation.
b) It shall be in close proximity to the equipment and within easy reach of the
operator.
c) It shall be marked as the disconnecting device for the equipment.
- 11 -
Instruction Manual αlpha-pH2000D
4 NORMAL OPERATION
4.1 Measurement mode
When the controller/transmitter is powered on, the display first shows all segments briefly,
after which the controller/transmitter automatically enters into the Measurement mode.
Please note: To guarantee accurate readings, the measuring system (transmitter
and sensor) must be calibrated.
MEAS
pH
O
C
The mode indicator “MEAS” at the top of the display indicates that the transmitter is in
Measurement mode. The upper alpha-numerical display shows the measured pH or ORP
value, while the lower display shows the temperature value if the controller is set for pH
measurement, or “ORP” if it is set for ORP measurement.
The annunciators “pH”, “mV” or “%” at the upper right side of the display indicate the current
measurement mode setting whether the controlling is set for pH, mV or ORP % measurement.
From Measurement mode you can access Calibration mode and Setup mode by pressing
the CAL key or ENT key followed by the corresponding security code. For detailed information
refer to section 5 “Calibration mode” or section 6 “Setup mode”, respectively.
By pressing the REL key in Measurement mode you can view the actual relay set points. By
pressing the MODE key followed by the corresponding security code in Measurement mode
you can switch relay operation mode from automatic to manual.
For detailed information refer to section 7 “Relay Modes”.
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Instruction Manual αlpha-pH2000D
5 CALIBRATION MODE
You can access the Calibration mode directly from the Measurement mode by pressing the
CAL key and entering the Calibration security code “11”. Calibration mode may also be
accessed via the Setup mode (see section 6.1).
5.1 Entering Calibration mode
MEAS
CAL
ENTERENTER
H
P
O
C
ENTERENTER
ENTERENTER
SETUP
HOLD
SETUP
HOLD
ENTERENTER
pH calibration
ORP-mV calibration
ORP-% calibration
see section 5.2
see section 5.3
see section 5.4
1. While in Measurement mode press the CAL key (direct access) or ENT key (access via Setup
mode).
2. If CAL key was pressed: The display prompts you to enter the calibration security code. Press
the ▲ or ▼ key to set the calibration security code to “11”, and then press the ENT key to
confirm the calibration security code.
3. If ENT key was pressed: The display prompts you to enter the security code. Press the ▲ or
▼ key to set the security code to “22”. Press the ENT key to confirm the security code, and
then press the ▲ or ▼ key to select the calibration sub-function.
If configured for pH control, the display shows “CAL PH”. If configured for ORP control, the
display shows “CAL ORP”. To start calibration, refer to the corresponding section (see
illustration above).
Note: to exit Calibration mode at any time press the ▲ and ▼ keys
simultaneously (escape). The transmitter returns to the Measurement mode and
the old calibration values remain active. The calibration security code automatically
resets from “11” to “000” after the transmitter returns to Measurement mode.
Note: The calibration is always carried out in the units (pH or mV or %) selected in
setup mode. The pH controller/transmitter allows a 1-point or 2-point calibration.
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Instruction Manual αlpha-pH2000D
5.2 pH Calibration
If the unit of measure is in pH (default), then the calibration is also carried out in pH. This
transmitter features a one-point or two-point calibration for pH with five preset buffer sets.
Buffer values refer to 25 oC. A standard pH buffer solution that matches one of these values is
required to calibrate the instrument.
Two point calibration
SETUP
HOLD
HOLD
CAL
H
P
H
P
HOLD
CAL
CAL
H
P
H
P
CAL
H
P
CAL
MEAS
One point calibration
1. Enter Calibration mode as described in section 5.1. The display shows “CAL PH” (for pH
calibration).
Note: If the display reads “CAL ORP”, see section 6.9 for procedures on how to switch from ORP to
pH readings.
2. Press the ENT key to start calibration. The “CAL” indicator appears at the top of display and
the buffer indicator appears in the bottom corner of the display. The display shows the actual
pH reading (upper value) and the buffer value for zero point (lower value). For the offset
(zero point) calibration, there are two values to choose from. They are pH 7.00 or pH 6.86.
Using the ▲ and▼ keys, choose the value that matches with the buffer used.
3. Place the electrode in the first buffer solution. In ATC mode, you must also immerse the
temperature probe in the buffer solution.
4. You can conduct either a one-point or a two-point calibration: Press the ENT for two point
calibration or the CAL key for one point calibration. The electrode indicator and CAL indicator
both flash for a few seconds. The controller automatically adjusts the reading to match the
buffer value.
H
P
O
C
atc
5. If one-point calibration was selected, the display will show the zero point in the lower section of
the display and the slope (default or using previous two-point calibration) in the upper section of
the display. Proceed to step 7 after zero point display. If two-point calibration was selected, the
lower section of the display will now show its next lower “pH” buffer. Use ▲ and ▼ keys to
select the second buffer from one of these preset value: - pH 1.68, pH 4.01, pH 9.00, pH 9.18
and pH 10.01. Remove the electrode from the first buffer, wash and then immerse it into the
second buffer. Press the ENT key, the electrode indicator and CAL indicator will flash for a few
seconds. The controller adjusts the reading to the second buffer.
6. After calibrating the second buffer value, the controller will automatically display the slope in the
upper and the zero point in the lower section of the display.
Note: You can also view the values for zero point and slope without calibration (see section 5.5 for
instruction). The zero point and slope are pre-determined after each calibration.
7. Press the ENT key to return to the Measurement mode.
Note: If you entered the Calibration mode from the Setup mode, the controller will return to the
setup menu.
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Instruction Manual αlpha-pH2000D
Note: If there is a calibration error, the controller displays “CAL ERR”. If this happens,
push both ▲ 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 6.3)
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Instruction Manual αlpha-pH2000D
5.3 ORP-mV Calibration
If controller is configured for ORP-mV measuring you can perform a one-point calibration.
CAL
HOLD
255
255
CAL
mV
HOLD
250
255
1. Enter Calibration mode as described in section 5.1. The display should read “CAL ORP”.
Note: If the display reads “CAL PH”, see section 6.9 for procedures on how to switch
from pH to ORP-mV readings.
2. Place sensor in the ORP solution.
3. Press the ENT key to start calibration. The “CAL”, buffer and electrode indicator appears on
the display. The upper and lower display shows the current mV output of the electrode without
any offset adjustment.
CAL
mV
MEAS
R.mV
250
CAL
4. Press the ▲ or ▼ key to adjust the upper display mV value to match your exact reading.
5. Press the ENT key (or CAL key) to confirm. The controller calculates the correction factor and
returns to the Measurement mode. The “R.mV” annunciator (Relative mV) will be shown on the
display indicating that the value displayed is the relative mV value of the default measurement.
5.4 ORP -% Calibration
If controller is configured for ORP-% measuring you can perform a calibration at two points
using a low concentration sample (20%) and a high concentrate sample (80%). To calibrate
the controller for ORP %:
CAL
HOLD
CAL
C.1
%
HOLD
CAL
1. Enter Calibration mode as described in section 5.1. The display should read “CAL ORP”.
Note: If the display reads “CAL PH”, see section 6.9 for procedures on how to switch
from pH to ORP-mV readings.
2. Press the ENT key to start calibration. The display prompts you to place the sensor in the high
concentration sample (relative value of 80%).
3. Place sensor in high concentration sample, then press the ENT key (or CAL key). The
electrode and CAL indicators flash. The unit automatically adjusts its reading to match the
solution value.
CAL
C.2
%
MEAS
59.0
CAL
%
4. The display prompts you to place the sensor in the low concentration sample (relative value of
20%). Remove the electrode from the first standard, wash it well and then immerse it in the 20%
standard.
5. When the display stabilizes press the ENT key (or CAL key). The electrode and “CAL”
indicator flashes and the controller adjust its display to the 20% relative value and exits to the
Measurement mode.
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Instruction Manual αlpha-pH2000D
Note: If there is a calibration error, the controller displays “CAL ERR”. If this happens,
push both ▲ or ▼ keys (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.
5.5 View actual zero and slope
MEAS
CAL
ATC
H
P
O
C
ENT
CAL
ENT
pH
1. While in Measurement mode press the CAL key. The display will prompt you to enter a
security code. Leave the security code at “000” (view only mode).
2. Press the ENT key.
The display shows the slope in mV (upper value) and the pH reading at 0 mV (zero point, lower
value).
Note: If no key is pressed for 30 seconds the transmitter automatically returns to
the Measurement mode.
3. Press the ENT key to return to the Measurement mode.
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Instruction Manual αlpha-pH2000D
6 SETUP MODE
6.1 Enter Setup mode
In the Setup mode the transmitter can be configured to your individual requirements.
MEAS
pH
O
C
ENTER
ENT
1. While in Measurement mode press the ENT key.
2. The display prompts you to enter the security code. Set the security code with ▲
or ▼ key to:
− “SCD 22” if you want to change parameter settings
− “SCD 000” if you want to view only parameter settings (view only mode)
ENTER
ENT
3. Press the ENT key.
SETUP
HOLD
ENTER
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENTER
ENTER
ENTER
ENT
Temperature settings
see section 6.3
ENT
Relay A (set point 1) settings
see section 6.4
ENT
Relay B (set point 2) settings
see section 6.4
SETUP
HOLD
ENTER
ENT
Control ler settings
see section 6.5
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENTER
ENTER
ENTER
ENTER
ENT
ENTER
ENT
Current output 1 settings
see section 6.6
ENT
Current output 2 settings
see section 6.7
ENT
Wash contact settings
see section 6.8
Unit settings
see section 6.9
ENT
Calibration
see section 5
Note: Note: to exit Setup mode at any time press the ▲ and ▼ key simultaneously
(escape). The transmitter returns to the Measurement mode.
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Instruction Manual αlpha-pH2000D
6.2 Electrode Offset (OFS) sub-function
The electrode offset sub-function is only available if the transmitter is configured for pH
measuring. Use this sub-function to set an offset that corrects the readings without removing
the electrode from the control system. The setting range is ± 120 mV.
The transmitter will add or subtract the offset value from the measuring pH and display 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 calibration or even electrode replacement.
1. Take a sample from the system. Record the controller’s pH reading at the time you take the
sample.
2. Measure the pH value of your sample using a calibrated pH tester, hand-held meter, or bench
meter. Record the correct pH value.
3. Select the “OFS” sub-function, and then press the ENT key.
SETUP
HOLD
SETUP
HOLD
H
P
H
P
4. The display shows the current measured pH value (lower section of the display) and the
current offset value (upper section of the display). Press the ▲ or ▼ key to adjust the pH
value noted in Step 2. As the ▲ and ▼ keys are being pressed to adjust the pH value, the
offset value also changes. Press the ENT key to confirm the new offset value.
5. Continue with additional Setup procedures, or return to the Measurement mode by pressing the
▲ and ▼ keys (escape) simultaneously.
Note: The offset value is reset during full calibration. See section 5 for full
calibration instructions.
Note: The offset sub-function is blanked out during ORP operation.
- 19 -
Instruction Manual αlpha-pH2000D
A
6.3 Setting temperature (Set °C°F) sub-function
SETUP
HOLD
1
SETUP
ENT
HOLD
SETUP
2
HOLD
ENT
O
C
O
F
ENT
SETUP
HOLD
SETUP
HOLD
3
ENT
3
ENT
O
C
SETUP
HOLD
SETUP
HOLD
4
ENT
5
SETUP
HOLD
6
ENT
O
C
TC
1. Select the “SET °C°F” sub-function, then press the ENT key.
2. Selecting temperature unit: press the ▲ or ▼ key to select the desired temperature unit
“°C” or “°F”. Press the ENTER key to confirm your selection.
3. Enable/disable ATC mode: press the ▲ or ▼ key to enable (ATC ON) or disable (ATC OFF)
automatic temperature compensation. Press the ENT key to confirm your selection.
− ATC disabled (ATC OFF):
For manual temperature compensation you can set the process and calibration
temperatures. This allows calibration at a temperature other than the process
temperature. Example: setting a calibration temperature of 25°C lets you calibrate
using standard solutions at 25°C, even if your process temperature is different from
25°C.
ENT
4. Setting the process temperature: press the ▲ or ▼ key to adjust the process temperature
(upper value, setting range: –10.0 to 125.0°C / 14.0 to 257.0 °F). Press the ENT key to confirm
process temperature.
5. Setting the calibration temperature: press the ▲ or ▼ key to adjust the calibration
temperature (upper value, setting range: – 10.0 to 125.0°C / 14.0 to 257.0 °F). Press the ENT
key to confirm the calibration temperature.
− ATC enabled (ATC ON):
6. Setting the temperature offset: The display shows the current temperature offset (upper value)
and the temperature currently measured (lower value). Compare the current temperature
displayed on the transmitter to a thermometer known to be accurate. Note the correct
temperature value. Press the ▲ or ▼ key to adjust the lower value. The upper number
indicates the offset value. You can offset the temperature by up to ±10°C/±18°F. Press the
ENT key to confirm your setting.
Continue with additional Setup procedures, or return to the Measurement mode by pressing
the ▲ and ▼ key (escape) simultaneously.
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Instruction Manual αlpha-pH2000D
6.4 Control Relay A / Relay B (SP1/SP2) sub-functi on
The SP1 sub-function determines the operating parameters for Relay A; while SP2 defines the
operating parameters for Relay B. Since these groups have the same set-up parameters, they
are described together.
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
2
pH
5
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
6
3
3
hi
ENT
ENT
ENT
SETUP
HOLD
4
pH
ENT
1. Select the “SP1” (Relay A) or “SP2” (Relay B) sub-function, then press the ENT key.
2. Setting set point value: press the ▲ or ▼ key to enter the value for set point 1 (set point 2)
at which your controller will activate. Press the ENT key to confirm your setting.
3. Selecting relay function: press the ▲ or ▼ key to select the desired relay function (“LO”=
low or “HI”= high). Press the ENT key to confirm your selection.
Note: This parameter lets you choose the relay function. Select “LO” to activate the
relay when the pH/ORP value undershoots the set point; select “HI” to activate the
relay when the value overshoots the set point. SP1 and SP2 can be selected as
“Lo/Lo”, “Lo/Hi”, “Hi/Lo”, or “Hi/Hi”.
4. Setting a hysteresis value: press the ▲ or ▼ key to select the desired hysteresis (setting
range: 0.1 to 1.0 pH, 10 to 100mV or 1 to 10%) for set point 1 (set point 2). Press the ENT key
to confirm your setting.
Note: Hysteresis prevents rapid contact switching if your value is fluctuating near
the set point. Please refer to Appendix 3 for a graphical representation of the
hysteresis.
Example: You have set your high set point at pH 10.0 and your hysteresis value at pH 0.5. If
your measured value overshoots pH 10.0, the controller’s relay activates. The actions of the
external device will cause the solution’s pH to drop. The relay will deactivate, when the pH
value drops below 9.5 pH.
- 21 -
Instruction Manual αlpha-pH2000D
5. Setting the on-delay time lag: press the ▲ or ▼ key to enter the on-delay time for set point
1 (set point 2). The controller will delay activation of the relay for the number of seconds (0 to
2000 seconds) you select. Press the ENT key to confirm your setting.
Note: You can set a time delay for each relay, which stops the relay from switching
on the moment the set point is exceeded. This controller lets you set a 0 to 2000
seconds time delay before your relay activates.
6. Setting the off-delay time lag: press the ▲ or ▼ key to enter the off-delay time for set point
1 (set point 2). Your controller will delay deactivation of the relay for the number of seconds (0
to 2000 seconds) you select. Press the ENT key to confirm your setting.
Note: You can set a time delay for each relay, which stops the relay from switching
off the moment the value reaches the set point and hysteresis. This controller lets
you set a 0 to 2000 seconds time delay before your relay deactivates.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
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Instruction Manual αlpha-pH2000D
6.5 Controller (CNTR) sub-function
The CNTR sub-function determines the controller’s parameters.
SETUP
HOLD
ENT
SETUP
HOLD
SETUP
HOLD
ENT
ENT
SETUP
HOLD
SETUP
HOLD
ENT
SETUP
HOLD
SETUP
HOLD
%
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENT
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENT
ENT
ENT
SETUP
HOLD
%
ENT
SETUP
HOLD
ENT
SETUP
HOLD
ENT
- 23 -
Instruction Manual αlpha-pH2000D
1. Select the “CNTR” sub function, then press the ENT key.
2. Selecting the controller type: press the ▲ or ▼ key to select the suitable controller type:
− OFF = controller off
Use control Off to operate controller as a monitor only or to prevent relays from
switching.
− L.CT = limit value control (on/off control).
Use limit control with pumps or valves for fast response
− P/PI = proportional/integral control
Use proportional control to operate your pumps smoothly or for precise control of
proportioning valves. Use PI controller to eliminate steady state error.
Note: please refer to Appendix 4 for detailed information on controller settings.
Press the ENT key to confirm your selection.
− If the controller is set to limit value control (L.CT):
3. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose
the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to
confirm your selection.
− If the controller is set to proportional control (P/PI):
4. Selecting the proportional controller type: press the ▲ or ▼ key to select the suitable
controller type (“PLC” = pulse length control, “PFC” = pulse frequency control). Press the ENT
key to confirm your selection.
− If the proportional controller type is set to pulse length control (PLC):
5. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose
the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to
confirm your selection.
6. Setting the proportional range: Press the ▲ or ▼ key to set the proportional range (setting
range: 10 to 500%). Press the ENT key to confirm your setting.
7. Setting the pulse length: Press the ▲ or ▼ key to set the pulse length (setting range: 0.5 to
20 seconds). Press the ENT key to confirm your setting.
8. Setting the integral action time: Press the ▲ or ▼ key to set the integral action time
(setting range: 0.0 to 999.9 minutes). Press the ENT key to confirm your setting.
- 24 -
Instruction Manual αlpha-pH2000D
− If the proportional controller type is set to pulse frequency control (PFC):
9. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose
the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to
confirm your selection.
10. Setting the proportional range: press the ▲ or ▼ key to set the proportional range (setting
range: 10 to 500%). Press the ENT key to confirm your setting.
11. Setting the pulse frequency: press the ▲ or ▼ key to set the pulse frequency (setting
range: 60 to 120 pulses per minute). Press the ENT key to confirm your setting.
12. Setting the integral action time: press the ▲ or ▼ key to set the integral action time
(setting range: 0.0 to 999.9 minutes). Press the ENT key to confirm your setting.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
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Instruction Manual αlpha-pH2000D
6.6 Current Output 1 sub-function
In this sub-function you set the current output range of the transmitter for pH or ORP values.
SETUP
HOLD
cur.1
1
ENT
SETUP
HOLD
SETUP
HOLD
2
ENT
2
ENT
SETUP
HOLD
SETUP
HOLD
3
pH
ENT ENT
3
pH
ENT
SETUP
HOLD
SETUP
HOLD
4
pH
4
pH
ENT
SETUP
HOLD
SETUP
HOLD
5
5
1. Select the “CUR.1” sub-function, and then press the ENT key.
2. Selecting the output type: press the ▲ or ▼ key to select the desired output type: 0-20 mA
or 4-20 mA. Press the ENT key to confirm your selection.
3. Setting the pH or ORP value at which the transmitter output will be 4 mA (or 0 mA): press
the ▲ or ▼ key to set the pH or ORP value to be equivalent to 4 mA or 0 mA, respectively.
Press the ENT key to confirm your setting.
4. Setting the pH or ORP value at which the transmitter output will be 20 mA: press the ▲
or ▼ key to set the pH or ORP value to be equivalent to 20 mA. Press the ENT key to confirm
your setting.
5. Selecting out of range current: Press the ▲ or ▼ key to switch “CU22” on or off. If “CU22”
is on, the output signal will jump to 22 mA when the measured pH and ORP value is below or
above the values set in points 3 & 4 above. Press the ENT key to confirm your setting.
ENT
Note: the “CU22” setting (on/off) of current output 1 applies to current output 2 as
well.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
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Instruction Manual αlpha-pH2000D
6.7 Current Output 2 sub-function
In this sub-function you set the current output range of the transmitter for temperature values.
1
SETUP
HOLD
cur.2
2
SETUP
ENT
HOLD
2
SETUP
HOLD
ENT
ENT
SETUP
HOLD
SETUP
HOLD
3
ENT
o
c
3
ENT
o
c
SETUP
HOLD
SETUP
HOLD
4
ENT
o
c
4
o
c
ENT
1. Select the “CUR.2” sub-function, then press the ENT key.
2. Selecting the output type: press the ▲ or ▼ key to select the desired output type: 0-20 mA
or 4-20 mA. Press the ENT key to confirm your selection.
3. Setting the temperature value at which the transmitter output will be 4 mA (or 0 mA):
press the ▲ or ▼ key to set the temperature value (setting range: -10.0 to 110.0 °C or 14 to
230 °F for NTC300 thermistor) to be equivalent to 4 mA (or 0 mA). Press the ENT key to
confirm your setting.
4. Setting the temperature value at which the transmitter output will be 20 mA: press the ▲
or ▼ key to set the temperature value (setting range: 0.0 to 110.0 °C or 32 to 230 °F for
NTC300 thermistor) to be equivalent to 20 mA. Press the ENT key to confirm your setting.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
- 27 -
Instruction Manual αlpha-pH2000D
6.8 Wash relay (WASH) sub-function
In this sub-function you set the parameters for the wash relay.
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
2
ENT ENT
2
ENT
SETUP
HOLD
SETUP
HOLD
3
3
ENT
SETUP
HOLD
4
ENT
SETUP
HOLD
5
off
1. Select the “WASH” sub-function, and then press the ENT key.
2. Enabling/disabling wash function: press the ▲ or ▼ key to enable (WASH ON) or disable
(WASH OFF) wash function. Press the ENT key to confirm your selection.
3. Selecting the relay status condition: press the ▲ or ▼ key to choose desired relay status
(de-energized = “DEEN” or energized = “EN”). Press the ENT key to confirm your selection.
4. Setting the wash interval in hours: Press the ▲ or ▼ key to set the desired wash interval
(setting range: 0.1 to 200.0 hours). Press the ENT key to confirm your setting.
ENT
5. Setting the wash duration in seconds: Press the ▲ or ▼ key to set the desired wash
duration (setting range: 1 to 2000 seconds). Press the ENT key to confirm your setting.
Note: During wash cycle the transmitter is set to HOLD. For safety reasons, the
HOLD function is activated 5 seconds prior and deactivated 10 seconds after the
wash cycle.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
- 28 -
Instruction Manual αlpha-pH2000D
6.9 Configuration (CNFG) sub-function
In this sub-function you configure the transmitter to suit your requirements.
SETUP
HOLD
3
1
ENT
SETUP
HOLD
2
SETUP
ENT
HOLD
ENT
SETUP
HOLD
4
SETUP
ENT
HOLD
5
ENT
SY
4
SETUP
SETUP
HOLD
2
ENT
HOLD
mV
ENT
SY
4
SETUP
HOLD
SY
%
ENT
SETUP
HOLD
SETUP
HOLD
6
6
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
7
7
7
ENT
ENT
MEAS
pH
O
C
ENT
1. Select the “CNFG” sub-function, and then press the ENT key.
2. Enabling/disabling the display backlight: press the ▲ or ▼ key to switch display backlight
on (BKLT ON) or off (BKLT OFF). Press the ENT key to confirm your selection.
3. Setting the backlight intensity (appears only If backlight is on): press the ▲ or ▼ key to set
backlight intensity (setting range: minimum 1 to maximum 4). Press the ENT key to confirm
your setting.
4. Selecting the unit of measurement: press the ▲ or ▼ key to select measurement mode:
- “PH SY” = pH measurement with symmetrical input
- “ORP mV SY” = ORP-mV measurement with symmetrical input
- “ORP % SY” = ORP-% measurement with symmetrical input
- Press the ENT key to confirm your selection.
5. Setting the alarm delay time in seconds: press the ▲ or ▼ key to set the alarm delay time
(setting range: 0 to 2000 seconds). Press the ENT key to confirm your setting.
Note: With this parameter you set the delay before the alarm relay activates when
the set point has been exceeded.
- 29 -
Instruction Manual αlpha-pH2000D
6. Selecting the alarm contact type: press the ▲ or ▼ key to select the alarm contact type:
− “STDY” = steady contact
− “FLET” = fleeting (single pulse) contact
Press the ENT key to confirm your selection.
Note: With this parameter you select whether the alarm contact will operate as a
steady contact or a fleeting (single pulse) contact. Pulse contact closing time is 1
second.
7. Resetting the transmitter settings to factory defaults: The display shows “NO DEF”. Press
the ▲ or ▼ key to select:
− “NO DEF” = keeps old values active, when confirmed with ENT key
− “CAL DEF” = resets all calibrations to factory defaults, when confirmed with ENT key
− “FCT DEF” = resets all settings to factory defaults, when confirmed with ENT key
Press the ENT key. The selected function will be executed and the transmitter returns
automatically to the Measurement mode.
Continue with Setup mode procedures, or return to Measurement mode by pressing the ▲
and ▼ keys simultaneously (escape).
6.10 Calibration (CAL) sub-function
The calibration procedure in Setup mode is identical to the procedure in the Calibration mode
(see section 5). The only difference is that the transmitter remains in Setup mode (instead of
Measurement mode) after calibration is completed.
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Instruction Manual αlpha-pH2000D
7 RELAY MODES
You can control devices connected to Relay A, Relay B or wash relay via the front panel of the
transmitter. In Automatic mode, the transmitter’s set point values activate the relays. In
Manual mode, you can manually turn “on” and “off” the control devices connected to the relays.
7.1 View relay set points
To view relay set points, the relay mode must be set to automatic (standard mode after switchon, relay mode LED “Auto” lights).
While in Measurement mode press the REL key.
pH
pH
2
off
The display shows the set point value for Relay A and LED “A” lights.
After two seconds the display shows the set point value for Relay B
and LED “B” lights).
After two seconds the display shows the status of the Wash relay
and LED “W” lights. If Wash relay is “off” the display shows “WASH
OFF”. If Wash relay is “on” the wash interval time and wash duration
is displayed.
After an additional two seconds the transmitter will return to
Measurement mode.
- 31 -
Instruction Manual αlpha-pH2000D
7.2 Manual relay mode
In manual relay mode, you can manually turn “on” and “off” the control devices connected to
Relay A, Relay B or Wash relay.
1. While in Measurement mode press the MODE key.
2. The display prompts you to enter the security code. Press the ▲ or ▼ key to set security
code to “22”.
3. Press the ENT key. The Manual relay mode is activated and the relay mode LED “Manu” lights.
Note: Pressing ENT key at a value other than “22” will cause the transmitter to
revert to Measurement mode, and the relays will remain in automatic mode.
4. Press the REL key to select either Relay A, Relay B or Wash relay. The corresponding LED (A,
B, or W) turns to red.
The manual control options now available depend on the control type (limit, pulse frequency,
or pulse length) you selected and set in section 6.5.
SETUP
HOLD
pH
If you selected Limit control: The display shows the current
measured value and “OFF” or “ON” depending on the relay status of
the currently selected relay.
off
off
SETUP
HOLD
pH
If you selected Pulse length control: The display shows the current
measured value (upper value) and the on time as a percentage of the
current duration set in the CNTR sub-function in setup mode (lower
o
value).
SETUP
HOLD
pH
If you selected Pulse frequency control: The display shows the
current measured value (upper value) and the pulse frequency
(lower value).
o
5. Press the ▲ or ▼ key to change the Relay on/off status, pulse length, pulse frequency or
wash function. The relay status LED at the right of the transmitter will also change from Red to
Green.
Note: Note: If you wish to manually change the status of relays, press the REL key
at this point and repeat step 5 for the other two relays. The relay(s) will remain
under manual control while you are setting a relay.
6. Press the MODE key to return to Measurement mode. The relays are now back to automatic
control.
- 32 -
Instruction Manual αlpha-pH2000D
8 TECHNICAL SPECIFICATIONS
8.1 General Specification
(a) pH
pH Measuring Range -2.00 to 16.00 pH
Resolution 0.01 pH
Accuracy ± 0.01 pH
(b) mV
mV Measuring Range -1000 to 1000 mV
Resolution 1 mV
Accuracy ± 1 mV
(b) mV percentage
Percentage mV Measuring Range 0 to 100% (for -100 to 100 mV)
Resolution 0.1%
Accuracy ± 0.2 % (or ± 1 mV)
(c) Temperature
Temperature measuring range -10.0 to +110.0 oC or +14.0 to +230.0 oF for NTC300
Resolution 0.1
Relative accuracy 0.5 oC or
Sensor NTC 300 (2 wire or 3 wire)
Compensation Automatic (± 10 ˚C/ ± 18 ˚F offset adjustment) or Manual
o
C or
0.1 oF
1.0 oF
8.2 Set-point and control function – R elay 1 & Relay 2
Function Switchable
- Selection in Control (CNTR) function of
Setup
(a) Off
The control function of the controller is off SP1 & SP2 function will not appear in setup when Off is
(b) Limit Control & P/PI Control
Relay contact selection for active mode Energise (EN) or
Set Point 1 (SP1) -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
Set Point 2 (SP2) -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
Active mode selection (for SP1 & SP2) LO (Relay is active when measured value < set point)
Hysteresis (for SP1 & SP2) 0.1 to 1 pH or 1 to 10.0%/ 10 to 100 mV
On (pickup) Delay (for SP1 & SP2) 0 to 2000 seconds
Off (Dropout) Delay (for SP1 & SP2) 0 to 2000 seconds
(c) P/PI Control only
Proportional Range 10 to 500 %
Integral Action Time (IAT) 0.0 to 999.9 minutes
(c) (1) Pulse Length Control (PLC)
Pulse Length 0.5 to 20.0 seconds
Off
Limit Control
P/PI Control (Pulse length / Pulse frequency)
selected in CNTR function to off mode
De-energise (DEEN)
HI (Relay is active when measured value > set point)
- 33 -
Instruction Manual αlpha-pH2000D
(c) (2) Pulse Frequency Control (PFC)
Pulse Frequency 60 to 120 pulses / minutes
Contact Outputs Two SPST relays
Switching Voltage / Current / Power Max 250VAC / Max 3A / Max 600VA
8.3 Wash Function – Wash Relay
Relay contact selection for active mode Energise (EN) or
De-energise (DEEN)
Wash Cycle Interval 0.1 to 200.0 hours
Wash Duration 1 to 2000 seconds
Contact Outputs One SPST relay
Switching Voltage / Current / Power Max 250VAC / Max 3A / Max 600VA
8.4 Alarm Function – Alarm Relay
Alarm Delay 0 to 2000 seconds
Alarm control Steady or leet (pulse)
Contact Outputs One SPDT relay
Switching Voltage / Current / Power Max 250VAC / Max 3A / Max 600VA
8.5 Transmitter Function
(a) Current Output 1 – pH/mV Proportional to pH/mV measured
Current output selection 4 – 20mA or 0 – 20mA
pH/mV value for 0 or 4mA current -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
pH/mV value for 20mA current -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
CU22 function On - 22mA current output for over range or under range
or if outside zoom setting
Off
- 0 or 4 mA current output for under range or below lower
zoom setting
- 20mA current output for over range or above upper
zoom setting
(b) Current Output 2 - Temperature Proportional to Temperature measured
Current output selection 4 – 20mA or 0 – 20mA
Temperature value for 0 or 4mA
current
Temperature value for 20mA current 0.0 to +110.0oC or +32.0 to +230.0oF for NTC300
-10.0 to +100.0oC or +14.0 to +212.0oF for NTC300
8.6 Voltage Output & Hold Function Switch
+12 V Output 11.5 to 12.5 V Output - Max 50 mA
Hold Function Switch Hold function to freeze output current (0/4...20mA) and
release control relays
- 34 -
Instruction Manual αlpha-pH2000D
8.7 Display
LCD UV coat, backlit 14 segments display with symbols for
status information
Back light On/Off selectable with four levels of brightness control
8.8 Power Supply
Input 80 to 250VAC/DC, 50/60Hz, Approximately 10VA
Main Fuse 315mA Time Delay, 250V, Bussmann BK/GDC-315mA
Pollution Degree 2
Transient Voltage Category II
Connector 5-pin screw terminal
8.9 Electrical data and Connections
pH/mV Input 8-pin Screw Terminal (3.5mm pitch)
Temperature Input 8-pin Screw Terminal (3.5mm pitch)
Relay 1, Relay 2, Wash Relay & Alarm Relay 9-pin Screw Terminal (7.62mm pitch)
Current Output 1, Current Output 2, 12V
output & Hold function switch
Connection terminal 5-pin, 8-pin, 9-pin & 13-pin terminal connectors
13-pin Screw Terminal (3.5mm pitch)
8.10 Mechanical Specifications
Dimensions (W x H x D) - Wall Mount 144 x 144 x 111.5 mm
Weight - Wall Mount 950g (unit) / 1100g (Packed)
Environmental Rating - Wall Mount NEMA 4X, IP65
8.11 Electromagnetic Compliance (EMC) Specifications
Emitted Interference EN 61326
Immunity to Interference EN 61326
8.12 Environmental Conditions
Ambient Temperature operating range 0 to 40 oC
Maximum Relative Humidity 80% up to 31 oC decreasing linearly to 50% at 40oC
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Instruction Manual αlpha-pH2000D
9 ACCESSORIES
9.1 Replacement Unit
Product Description Eutech Instruments Order Code
αlpha pH 2000 Controller / Transmitter, wall mount version
EC-PHCTP2000D
9.2 Assembly Accessories
Product Description
pH Differential Electrode with NTC300 thermistor
ORP Differential Electrode with NTC300 thermistor
Note: Above pH/OR electrodes can withstand a pr essure up to 6 bar pressure. These
electrodes have integral 3m measuring cable.
Note: Please contact your authorised distributor or dealer for the prices of extension measuring cables
and other accessories like tee joints, electrode assembly, and calibration solutions.
Eutech Instruments Order Code
ECFP21A1A1
ECFR21A1A1
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Instruction Manual αlpha-pH2000D
10 GENERAL INFORMATION
10.1 Warranty
Eutech Instruments/Oakton Instruments warrant this product to be free from significant
deviations in material and workmanship for a period of one year from the date of purchase. If
repair is necessary and not the result of abuse or misuse within the warranty period, please
return by freight pre-paid and amendment will be made without any charge. Eutech
Instruments/Oakton Instruments Customer Service Dept. will determine if the product problem
is due to deviations or customer abuse. Out-of-warranty products will be repaired on an
exchange basis at cost.
10.2 Packaging / Scope of delivery
The instrument is packaged in a corrugated box with an instruction manual and the following
accessories:
Wall mount version:
• Plug, nylon, red, 2 pcs
• PG13.5, cable gland, 3 pcs
• Connectors, one each of 5 way (5.08 mm), 9 way (7.62mm), 13 way (3.5mm), 8 way
(3.5mm)
10.3 Return of goods
Before returning goods for any reason whatsoever, Customer Service Dept. has to be
informed in advance. Items must be carefully packed to prevent damage during shipment, and
insured against possible damage or loss. Eutech Instruments/ Oakton Instruments will not be
responsible for any damage resulting from careless or insufficient packing.
Warning: Shipping damage as a result of inadequate packaging is the user's/distributor’s
responsibility, whoever applicable. Please follow the guidelines below before shipment.
10.4 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 better protection. Include a brief
description of any faults suspected for the convenience of Customer Service Dept., if possible.
10.5 Maintenance and Cleaning
Maintenance
The αlpha pH 2000D contains no user repairable components. Please contact Eutech
Instruments or its distributor if there is any problem with the unit.
Cleaning
To remove dust, dirt and spots, the external surfaces of the transmitter may be wiped with a
damp, lint-free cloth. A mild household cleaner can also be used if necessary.
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Instruction Manual αlpha-pH2000D
A
11 APPENDICES
11.1 Appendix 1 – Unit fuse and jumper settings
Caution! Before opening the unit to replace the unit fuse, make sure the mains cable is
separated from the power supply.
View from both PCBA side
Factory setting: NTC300
Main Rev 0.2
lpha pH/DO20 000W New Main R ev 0.2 part No.: 8 4X368202
Factory setting: NTC300
Fuse 250V, 315 mA,
Time Delay
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Instruction Manual αlpha-pH2000D
11.2 Appendix 2 – 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 0.96 4.01 6.98 7.12 9.33 9.47 10.32
5 0.99 4.01 6.95 7.09 9.24 9.38 10.25
10 0.99 4.00 6.92 7.06 9.16 9.32 10.18
15 0.99 4.00 6.90 7.04 9.11 9.27 10.12
20 1.00 4.00 6.88 7.02 9.05 9.22 10.06
25 1.01 4.01 6.86 7.00 9.00 9.18 10.01
30 1.01 4.01 6.85 6.99 8.95 9.14 9.97
35 1.01 4.02 6.84 6.98 8.91 9.10 9.93
40 1.01 4.03 6.84 6.97 8.88 9.07 9.89
45 1.01 4.04 6.83 6.97 8.85 9.04 9.86
50 1.01 4.06 6.83 6.97 8.82 9.01 9.83
55 1.01 4.08 6.83 6.97 8.79 8.99 9.81
60 1.02 4.10 6.84 6.98 8.76 8.96 9.79
70 1.02 4.12 6.85 6.99 8.72 8.92 9.76
80 1.02 4.16 6.86 7.00 8.68 8.89 9.74
90 1.02 4.20 6.88 7.02 8.65 8.85 9.73
pH 1.00 pH 4.01 pH 6.86 pH 7.00 pH 9.00 pH 9.18 pH 10.01
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Instruction Manual αlpha-pH2000D
11.3 Appendix 3 – Simple explanation on the function of hysteresis
SP1 Set to LO
SP2 Set to HI
RELAY ON
RELAY OFF
4.0
4.5
SP1
FORWARD DIRECTION
REVERSE DIRECTION
7.0
9.5 10.0
SP2
HYSTERESIS BAND
(DEFAULT = 0.5 pH)
The controller relay activates when the set-point is reached. In the reverse direction, it does
not de-activate when the value reaches the set-point. Instead, it continues to be active till the
value reaches the amount set by the Hysteresis band.
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Instruction Manual αlpha-pH2000D
2
11.4 Appendix 4 – General instructions concerning Controller Setting
11.4.1 Control characteristic of Controllers used as limit value switch
MIN function MAX function
-Xw
Xp = 0
100% Yh
50%
0%
SP 2SP 1
Xp = 0
11.4.2 Control characteristic of P-Controllers as proportional controller
MIN function MAX function
100% Yh
+Xw
50%
-Xw
Xp
Prop. band Prop. band
SP 1
0%
Xp
SP
11.4.3 Control characteristic of PI-Controllers as proportional integral controller
100%
50%
25%
SP1 SP 2
20%
10%
Proportional. ba nd
X
P
Prop. band
X
P
+Xw
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Instruction Manual αlpha-pH2000D
11.4.4 Control signal of Pulse length Controllers
Relay
Pulse Length T
tON
ON
OFF
tOFF
Time [s]
The output relay of the pulse length controller is clock-timed. The switching period T remains
constant. Depending on the divergence from the limit value, the switch on time tON is
increased or decreased in accordance with the proportional range Xp.
The following applies:
tON + tOFF = T (Const.)
greater divergence Î greater tON
Xp exceeded Î tON = T (relay remains picked up)
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Instruction Manual αlpha-pH2000D
11.4.5 Control signal of Pulse Frequency Controllers
Relay
Pulse Length T
tON
ON
OFF
tOFF
Time [s]
The output relay of the pulse frequency controller is clock-timed. The pulse duration tON
remains constant at 250 msec. Depending on the divergence from the limit value, the
frequency (1/T) is increased or decreased in accordance with the proportional range Xp.
The following applies:
tON = Const. (250 msec.)
greater divergence Î greater f (greater frequency)
Xp exceeded Î max. frequency
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Instruction Manual αlpha-pH2000D
11.5 Appendix 5 – Abbreviations used in menu displays
Abbreviation Meaning Abbreviation Meaning
MEAS Measurement CUR. 1 Output current 1
CAL Calibration CUR. 2 Output current 2
ENT Enter OUT Output signal
OFS Offset 4 - 20 4 to 20mA
C. CD Calibration security code 0 - 20 0 to 20 mA
S. CD Setup security code R.0 Value at 0 mA
SET Setting R. 4 Value at 4 mA
ATC Automatic temperature calibration R. 20 Value at 20 mA
SP1 Set point 1 CU22 Out of range output current 22 mA
SP2 Set point 2 WASH Wash
LO Low limit H. INT Cleaning interval in hours
HI High limit S. DUR Cleaning duration in seconds
HYS Hysteresis CNFG Configuration
ON. D On delay BKLT Back light
OFF. D Off delay LEVL Level
CNTR Controller PH SY Symmetrical pH mode
L. CT Limit control ORP SY Symmetrical ORP mode
PLC Pulse length control AL. D Alarm delay
PFC Pulse frequency control AL.C Alarm Contact
P/PI Proportional control STDY Steady
EN Energized FLET Fleet, impulse
DEEN Deenergized DEF Default
REL Relay FCT DEF Factory default
PRP Proportional band CAL DEF Calibration default
T. PL Pulse length time
F. PF Pulse frequency
IAT Integral action time
MANU Manual
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For more information on Eutech Instruments’ products, contact your nearest distributor or visit our
website listed below:
Eutech Instruments Pte Ltd.
Blk 55, Ayer Rajah Crescent,
#04-16/24 Singapore 139949
Tel: (65) 6778 6876
Fax: (65) 6773 0836
E-mail: marketing@eutechinst.com
Web-site: www.eutechinst.com
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