Thermo Scientific ALPHA PH 2000 User Manual

Alpha pH 2000

Processor/Transmitter

pH / ORP

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Preface

This manual serves to explain the use of the Alpha pH 2000 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 Alpha pH 2000 pH/ORP controller/transmitter. If you have doubts
in the use of the instrument, please do not hesitate to contact your nearest Alpha
Authorised Distributor.

The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on part of Thermo
Scientific.

Thermo Scientific cannot accept any responsibility for damage or malfunction of the
unit due to improper use of the instrument.

Copyright ©2003 All rights reserved.

Safety Information

The Alpha pH 2000 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 ............................................................................................................. 11

4 NORMAL OPERATION.................................................................................................................14

4.1 MEASUREMENT MODE................................................................................................................ 14

5 CALIBRATION MODE................................................................................................................... 15

5.1 ENTERING CALIBRATION MODE................................................................................................... 15

5.2 PH CALIBRATION .......................................................................................................................16

5.3 ORP–MV CALIBRATION............................................................................................................. 17

5.4 ORP -% CALIBRATION............................................................................................................... 18

5.5 VIEW ACTUAL ZERO AND SLOPE.................................................................................................. 19

6 SET-UP MODE .............................................................................................................................. 20

6.1 ENTER SETUP MODE.................................................................................................................. 20

6.2 ELECTRODE OFFSET (OFS) SUB-FUNCTION................................................................................ 21

6.3 SETTING TEMPERATURE (SET OC) SUB-FUNCTION ....................................................................... 22

6.4 CONTROL RELAY A/CONTROL RELAY B (SP1/SP2) SUB-FUNCTION............................................. 23

6.5 CONTROLLER (CNTR) SUB-FUNCTION........................................................................................ 25

6.6 CURRENT OUTPUT 1 SUB-FUNCTION........................................................................................... 27

6.7 CURRENT OUTPUT 2 SUB-FUNCTION........................................................................................... 28

6.8 WASH RELAY (WASH) SUB-FUNCTION........................................................................................ 29

6.9 CONFIGURATION (CNFG) SUB-FUNCTION ...................................................................................30

6.10 CALIBRATION (CAL) SUB-FUNCTION ...........................................................................................32

7 RELAY MODES............................................................................................................................. 33

7.1 VIEW RELAY SET POINTS ............................................................................................................33

7.2 MANUAL RELAY MODE................................................................................................................ 34

8 TECHNICAL SPECIFICATIONS ................................................................................................... 35

8.1 GENERAL SPECIFICATION .......................................................................................................... 35

8.2 SPECIFICATIONS FOR WALL MOUNT VERSION............................................................................... 36

8.3 SPECIFICATIONS FOR PANEL MOUNT VERSION .............................................................................37

9 ACCESSORIES.............................................................................................................................38

9.1 REPLACEMENT UNIT.................................................................................................................. 38

9.2 ASSEMBLY ACCESSORIES.......................................................................................................... 38

10 GENERAL INFORMATION........................................................................................................ 39

10.1 WARRANTY............................................................................................................................... 39

10.2 PACKAGING............................................................................................................................... 39

10.3

RETURN OF GOODS................................................................................................................... 39

10.4 GUIDELINES FOR RETURNING UNIT FOR REPAIR.......................................................................... 40

10.5 MAINTENANCE AND CLEANING.................................................................................................... 40

11 APPENDICES ............................................................................................................................ 41

11.1 APPENDIX 1 – UNIT FUSE AND JUMPER SETTINGS........................................................................ 41

11.2 APPENDIX 2 – PH BUFFER VALUES AT VARIOUS TEMPERATURES................................................... 43

11.3 APPENDIX 3 –SIMPLE EXPLANATION ON THE FUNCTION OF HYSTERISIS......................................... 44

11.4 APPENDIX 4 – GENERAL INSTRUCTIONS CONCERNING CONTROLLER SETTING .............................. 45

11.4.1 Control characteristic of Controllers used as limit value switch....................................... 45

11.4.2 Control characteristic of P-Controller as proportional controller...................................... 45

11.4.3 Control characteristic of PI-Controller as a proportional integral controller..................... 45

11.4.4 Controller signal of Pulse length Controllers ................................................................... 46

11.4.5 Controller signal of Pulse Frequency Controllers............................................................47

11.5 APPENDIX 5 – ABBREVIATIONS USED IN MENU DISPLAYS.............................................................. 48

1 INTRODUCTION

1.1 At the very beginning

We thank you for having purchased the Alpha pH 2000 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 Eutech Instruments supplier. They
will be glad to assist you.

1.2 Intended use

The Alpha pH 2000 pH/ORP Controller is 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.

1.3 Safety instructions

− The Alpha pH 2000 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 Alpha pH 2000 must only be operated under the specified
operating conditions (see section 8).

− The Alpha pH 2000 must not be repaired by the customer.

− The Alpha pH 2000 must only be opened to replace the unit fuse

or to set the jumper for Pt100/Pt1000 temperature sensor. 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 Alpha pH 2000 are allowed. The
manufacturer/supplier accepts no responsibility for damage
caused by unauthorised 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 Eutech Instruments distributor, they will take care of proper disposal.

2 PRODUCT DESCRIPTION

2.1 Description of unit

The Alpha pH 2000 is used for measuring pH or ORP and temperature
values. The pH or ORP values can be measured using proportional or limit
control. The controller is available in two versions, one for panel mounting
and one for wall mounting in an enclosure. The controller can be used for
applications such as water treatment and monitoring, galvanic­decontamination, chemical processing, food processing, clean or wastewater
control and neutralization processes.

This controller has many user-friendly and safety features which include:

• Menu-driven program that simplifies set-up.

• Built-in non-volatile memory to ensure that calibration and other

information are not erased if power supply fails.

• Push-button for 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.

• Two galvanically isolated current outputs 0/4...20mA

• 0 to 1999 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.

• Asymmetrical/symmetrical input for pH/ORP mode of operation.

• 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.

• Two switching contacts as set-point relays.

• Separate alarm relay alerting you to set point limits exceeded for a certain

time and if the Pt100/Pt1000 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

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 Pt 100/1000,

• 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

Power Mains

(220/110VAC)

Flow Assembly

MeasurementCable

Process Assembly

with Electrode

Chart Recorder

pH Controller

2.3 Unit Overview

Wall mounting version

Panel mounting version

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.

Mode indicators:

– MEAS: Measurement mode
– SETUP: Set-up mode
– CAL: Calibration mode

Status indicators:

– 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

MEAS

P

H%

SETUP

CAL

HOLD

O

C

s

p
atc

m

v

h

ready

err

O

f

2.3.2 Key functions

Key

Description

– 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 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)

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.

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.

2.3.3 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

11 Calibration mode to start calibration

22 Setup mode to configure parameters

22 Manual relay operation to switch relay operation mode

from automatic to manual

Menu overview

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

cur.1

SETUP

HOLD

cur.2

SETUP

HOLD

SETUP

HOLD

MEAS

P

H

O

C

SETUP

HOLD

Temperature settings

see section 6.3

Relay A (set point 1) setti ngs

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

Wash contact settings

see section 6.8

Unit settings

see section 6.9

Calibration

see secti o n 5

CAL

ENTERENTER

CAL

*CCD “000”= Check calibration parameters (View only mode)
CCD “11” = Calibration mode

** SCD “000” = Check setup parameters (View only mode)
SCD “22” = Setup mode

3 ASSEMBLY AND INSTALLATION

3.1 Mounting the unit

Wall Mounting Version

approx. 14 [.55]

39 [1.54]

Holes for wall
mounting (2X)

21.5 [.85]

6 [.24]

144 [5.67]

144 [5.67]

78 [3.07]

111.50 [4.39]

27.5 [1.08]

24 [.94]

66.5 [2.62]

80 [3.15]

90 [3.54]

57.8[2.28]

90 [3.54]

Pg13.5 (3 pcs.)

Holes for post
mounting (4X)

For Pg13.5 cable glands

Unit:
MM [INCH]

Transmitter housing for wall mounting: protection class IP 65

Panel mounting version

Flat gasket 1mm [.04]
(to be inserted by customer)

Panel cut out

UNIT: MM [INCH]

Transmitter housing for panel mounting: protection class IP 54 (front), IP 40 (housing)

3.2 Connection Diagram

Caution: Ensure electrical mains are disconnected before proceeding.

Connection for wall mounting version

RELA RELB WASH RE LAY ALAR M RELAY

-+

Current
OP 2

29 28 19

GND +12V-+Current

OP1

3031 20E22

PT100/
PT1000

27

LIQ
GND

2524 26

HOLD

14 13

1291011

87

N LE

3421

56

pH/ mV

1. AC mains live wire 17. no connection

2. AC mains neutral wire 18. no connection

3. AC mains protective earth wire 19. 12V Power supply

4. Alarm relay (NO) 20. 12V ground

5. Alarm relay common 21. no connection

6. Alarm relay (NC) 22. Earth ground

7. Wash relay 23. no connection

8. Wash relay 24. Temperature ground

9. Relay B (SP 2) 25. Temperature input

10. Relay B (SP 2) 26. Temperature sense (short to

11. Relay A (SP 1) terminal 25 if using 2- wire RTD)

12. Relay A (SP 1) 27. PMP, liquid ground in symmetrical
ode

13. Hold function 28. 4-20 mA temperature output, -ve

terminal

14. Hold function 29. 4-20 mA temperature output, +ve

terminal

15. no connection 30. 4-20 mA pH output, -ve terminal

16. no connection 31. 4-20 mA pH output, +ve terminal

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 (5 & 6).

NOTE:
Switch or circuit breaker shall included in the building installation.
It shall be in close proximity to the equipment and within easy reach of the

operator.
It shall be marked as the disconnecting device for the equipment.

Connection for panel mounting version

1. AC mains live wire 17. no connection

2. AC mains neutral wire 18. no connection

3. AC mains protective earth wire 19. 12V Power supply

4. Alarm relay (NO) 20. 12V ground

5. Alarm relay common 21. no connection

6. Alarm relay (NC) 22. Earth ground

7. Wash relay 23. no connection

8. Wash relay 24. Temperature ground

9. Relay B (SP 2) 25. Temperature input

10. Relay B (SP 2) 26. Temperature sense (short to terminal 25 if

11. Relay A (SP 1) using 2- wire RTD

12. Relay A (SP 1) 27. PMP, liquid ground in symmetrical mode

13. Hold function 28. 4-20 mA temperature output, -ve terminal

14. Hold function 29 4-20 mA temperature output, +ve terminal

15. no connection 30. 4-20 mA pH output, -ve terminal

16. no connection 31. 4-20 mA pH output, +ve terminal

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 (5 & 6).

NOTE:
Switch or circuit breaker shall included in the building installation.
It shall be in close proximity to the equipment and within easy reach of the

operator.
It shall be marked as the disconnecting device for the equipment.

4 NORMAL OPERATION

4.1 Measurement mode

When the controller is powered on, the display first shows all segments
briefly, then the transmitter automatically enters into the Measurement

mode.

Please note: To guarantee accurate readings the measuring system

(controller and sensor) must be calibrated.

MEAS

P

H

O

C

The mode indicator “MEAS” at the top of the display indicates that the
controller is in Measurement mode. The upper alpha-numerical 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.

The annunciators “pH”, “mV” or “%” at the upper right side of the display
indicate the current measurement mode setting whether the controller 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 in Measurement mode you can
switch relay operation mode from automatic to manual.

For detailed information refer to section 7 “Relay Modes”.

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 access via the Setup mode (see section 6.1).

5.1 Entering Calibration mode

ENTERENTER

ENTERENTER

ENTERENTER

ENTERENTER

MEAS

P

H

O

C

CAL

SETUP

HOLD

SETUP

HOLD

pH calibration
ORP-mV calibration
ORP-% calibra tion

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”, 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, 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▼ key
simultaneously (escape). The controller returns to the Measurement

mode and the old calibration values remain active. The calibration
security code automatically resets from “11” to “000” after the controller
returns to Measurement mode.

5.2 pH Calibration

This controller unit features one-point or two-point calibration with five preset
buffer sets. Buffer values refer to 25 °C. To calibrate the instrument, you
need a standard pH buffer solution that matches one of these values.

two-point calibration

SETUP

HOLD

P

H

CAL

HOLD

P

H

P

H

CAL

HOLD

P

H

P

H

CAL

MEAS

P

H

O

C

atc

CAL

CAL

one-point calibration

1. Enter Calibration mode as described in section 5.1. The display should

read “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 m ust also

immerse the temperature probe in the buffer solution. Likewise for
symmetrical mode, you must also immerse the potential matching pin in
the buffer.

4. You can conduct either a one-point or a two-point calibration: Press the

ENT key for two point calibration or the CAL key for one point
calibration. The electrode indicator and CAL indicator both flash. The
controller automatically adjusts the reading to match the buffer value.

5. If one-point calibration was selected, the display will show the slope and

offset. 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 values: - 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 and CAL indicators will flash. The controller adjusts the reading
to the second buffer.

6. After calibrating with 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 5.1.2 for instruction). The zero point and slope are re­determined 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.

Note: If there is a calibration error the transmitter displays “ERR”. In
this case, press the ▲ and ▼ keys simultaneously (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 the process temperature (for setting the
calibration temperature and the process temperature, see section 6.3).

5.3 ORP–mV Calibration

If controller is configured for ORP-mV measuring you can perform only a
one-point calibration.

meas

SETUP

HOLD

CAL

HOLD

M

V

CAL

HOLD

M

V

CAL

250

250

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” indicator appears on
the display. The 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. Press the ENT key to confirm. The controller calculates the correction
factor and returns to the Measurement mode.

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
concentration sample (80%). To calibrate the controller for ORP %:

CAL

CAL

meas

59.0

%

CAL

HOLD

SETUP

HOLD

CAL

HOLD

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-% 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 the high concentration sample, then press the ENT key.

The electrode and CAL indicators flash. The unit automatically adjusts its
reading to match the solution value.

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. 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 transmitter displays “ERR”. In
this case press 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.

5.5 View actual zero and slope

ENT

ENT

CAL

P

H

CAL

MEAS

P

H

O

C

atc

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.

6 SET-UP MODE

6.1 Enter Setup mode

In the Setup mode the controller can be configured to your individual
requirements.

MEAS

P

H

O

C

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

ENTER

ENT

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

cur.1

SETUP

HOLD

cur.2

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

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

Wash contact settings

see section 6.8

Unit settings

see section 6.9

Calibration

see section 5

CAL

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:
–“SCD22” if you want to change parameter settings
–“SCD000” if you want to view only parameter settings (view

only mode)

3. Press the ENT key.

Note: to exit Setup mode at any time press the ▲ and ▼ key
simultaneously (escape). The controller returns to the Measurement mode.

6.2 Electrode Offset (OFS) sub-function

The electrode offset sub-function is only available if the controller 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 controller will add or subtract the offset value from the measured 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, hand­held meter, or bench meter. Record the correct pH value.

3. Select the “OFS” sub-function, then press the ENT key.

SETUP

HOLD

P

H

SETUP

HOLD

P

H

4. The display shows the current measured pH value (lower value) and the
current offset value (upper value). 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.

6.3 Setting temperature (Set

o

C) sub-function

SETUP

HOLD

SETUP

HOLD

O

C

SETUP

HOLD

O

SETUP

HOLD

SETUP

HOLD

O

C

SETUP

HOLD

O

C

atc

SETUP

HOLD

SETUP

HOLD

ENT

ENT

ENT

ENT

ENT

ENT

ENT

1

2

3

3

4

5

6

ENT

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 ENT 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 buffer solutions at 25°C, even if your process temperature
is different from 25°C.

4. Setting the process temperature: press the ▲ or ▼ key to adjust the
process temperature (upper value, setting range: –9.9 to 125°C / 15 to 257
°F). Press the ENT key to confirm process temperature.

5. Setting calibration temperature: press the ▲ or ▼ key to adjust the
calibration temperature (upper value, setting range: –9.9 to 125°C / 15 to
257 °F). Press the ENT key to confirm the calibration temperature.

ATC enabled (ATC ON):

6. Setting 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 controller to a
thermometer known to be accurate. Note down 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 ▼ keys (escape) simultaneously.

6.4 Control Relay A/Control Relay B (SP1/SP2) sub-function

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

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

hi

1

2

5

6

3

3

4

ENT

ENT

ENT

ENT

ENT

ENT

ENT

P

H

SETUP

HOLD

1. Select the “SP1” (Relay A) or “SP2” (Relay B) sub-function, then press
the ENT key.

2. Setting set point value: press ▲ 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 ranges: 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 the measured 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.

5. Setting the on-delay time lag: press the ▲ or ▼ key to enter the on­delay time for set point 1 (set point 2). The controller will delay activation of

the relay for the number of seconds (0 to 1999 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 1999 second time delay before your relay activates.

6. Setting the off-delay time lag: press the ▲ or ▼ key to enter the off­delay time for set point 1 (set point 2). Your controller will delay
deactivation of the relay for the number of seconds (0 to 1999) 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 1999 second time delay
before your relay deactivates.

Continue with Setup mode procedures, or return to Measurement mode by
pressing the ▲ and ▼ keys simultaneously (escape).

6.5 Controller (CNTR) sub-function

The CNTR sub-function determines the controller’s parameters.

7

8

9

9

10

11

12

5

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

off

SETUP

HOLD

l.ct

SETUP

HOLD

pfc

SETUP

HOLD

plc

SETUP

HOLD

p/pI

1

2

2

2

3

3

4

4

5

6

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

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 values 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.

Note: If the integral action time is set to ‘0.0’, then the unit functions as a

‘P’ Controller.

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.

Note: If the integral action time is set to ‘0.0’, then the unit functions as a

‘P’ Controller.

Continue with Setup mode procedures, or return to Measurement mode by
pressing the ▲ and ▼ keys simultaneously (escape).

6.6 Current Output 1 sub-function

In this sub-function you set the current output range of the transmitter for pH
or mV values.

2

2

3

3

4

4

5

5

SETUP

HOLD

P

H

SETUP

HOLD

P

H

SETUP

HOLD

P

H

SETUP

HOLD

P

H

SETUP

HOLD

P

H

SETUP

HOLD

SETUP

HOLD

P

H

SETUP

HOLD

1

cur.1

SETUP

HOLD

ENT

ENT

ENT ENT

ENT

ENT

ENT

ENT

1. Select the “CUR.1” 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 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.

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).

Current Output 2 sub-function

In this sub-function you set the current output range of the transmitter for
temperature values.

ENT

ENT

ENT

ENT

ENT

ENT

ENT

o

c

o

c

o

c

o

c

2

2

3

3

4

4

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

1

cur.2

SETUP

HOLD

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:

-9.9 to 115°C or 15 to 237 °F) 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: -0.1 to 125°C or 35 to 257 °F) 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).

6.7 Wash relay (WASH) sub-function

In this sub-function you set the parameters for the wash relay.

1

2

2

3

3

4

5

ENT

ENT ENT

ENT

ENT

ENT

ENT

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

off

1. Select the “WASH” sub-function, 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 199.9 hours). Press the ENT
key to confirm your setting.

5. Setting the wash duration in seconds: Press the ▲ or ▼ key to set the
desired wash duration (setting range: 1 to 1999 seconds). Press the ENT

key to confirm your setting.

Note: During wash cycle the controller 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).

6.8 Configuration (CNFG) sub-function

In this sub-function you configure the controller to suit your requirements.

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

s

%

SETUP

HOLD

SETUP

HOLD

%

m

v

SETUP

HOLD

m

v

SETUP

HOLD

s

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT ENT

12

2

3

SETUP

HOLD

s

4

4

4

4

4

4

5

6

7

8

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

MEAS

P

H

O

C

ENT

ENT

ENT

ENT

6

7

8

8

1. Select the “CNFG” sub-function, 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 measurement mode: press the ▲ or ▼ key to select
measurement mode:

– “PH SY” = pH measurement with symmetrical input
– “PH ASY” = pH measurement with asymmetrical input
– “ORP % SY” = ORP-% measurement with symmetrical input
– “ORP % ASY” = ORP-% measurement with asymmetrical input
– “ORP mV SY” = ORP-mV measurement with symmetrical input
– “ORP mV ASY” = ORP-mV measurement with asymmetrical 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 1999 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.

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. Selecting the sensor type: press the ▲ or ▼ key to select the sensor
type which is connected to the controller:

– “GLAS” = glass electrode
– “ANTY” = antimony electrode

Press the ENT key to confirm your selection.

Note: This parameter is not available in ORP mode.
Note: After each changeover, the factory calibration data for zero point

and slope are overwritten. Be sure to recalibrate (see section 5).

8. Resetting the controller 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.
– “FCT DEF” = resets all settings to factory defaults, when confirmed with

ENT.
– “CAL DEF” = resets calibration settings to factory defaults, when confirmed

with ENT.
Press the ENT key. The selected function will be executed and the controller

returns automatically to the Measurement mode.
Continue with Setup mode procedures, or return to Measurement mode by

pressing the ▲ and ▼ keys simultaneously (escape).

6.9 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.

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 controller’s set point
values activate the relays. In Manual mode, you can manually turn “on” and
“off” the control devices connected to relay A or relay B.

7.1 View relay set points

To view relay setpoints, the relay mode must be set to automatic (standard
mode after switch-on, relay mode LED “Auto” lights).

While in Measurement mode press the REL key.

P

H

The display shows the set point value for Relay A and LED
“A” lights.

8

2

P

H

After two seconds the display shows the set point value for
Relay B and LED “B” lights).

off

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 controller will return to Measurement
mode.

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 ENTER key at a value other than “22” will cause the
controller 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.

P

H

SETUP

HOLD

off

P

H

SETUP

HOLD

off

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.

P

H

SETUP

HOLD

o

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 sub­function in setup mode (lower value).

P

H

SETUP

HOLD

o

If you selected Pulse frequency control: The display shows the
current measured value (upper value) and the pulse frequency
(lower value).

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
controller will also change from Red to Green.

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.

8 TECHNICAL SPECIFICATIONS

8.1 General Specification

Alpha pH 2000 Controller / Transmitter

pH Range -2.00 to 16.00 pH
Resolution & Accuracy 0.01 pH & ± 0.01 pH
mV Range 0 to 100% or -1000 to 1000 mV
Resolution & Accuracy 0.1% or 1 mV / ± 1 mV
Temperature -9.9 to 125 oC (15.0 to 257.0 oF)
Resolution & Accuracy 0.1 & ± 0.5 oC (± 1.0 oF)
Sensor Pt 1000 or Pt 100 (jumper selectable)
Temperature Compensation Automatic (± 10 oC / ± 18 oF offset adjustment) /

Manual

Set-point And Controller Functions

Function Limit / Proportional Control / Proportional Integral

(Pulse Length or Pulse Frequency)
Integral time 0 to 999.9 minutes
Adjustable period with pulse

length controller

0.5 to 20 sec

Adjustable period with pulse
frequency controller

60 to 120 pulses/min

Pickup / Dropout Delay 0 to 1999 seconds
Wash Cycle 0.1 to 199.9 hours
Wash Duration 1 to 1999 seconds
Switching pH Hysteresis 0.1 to 1 pH
Switching ORP Hysteresis 1 to 10.0 % / 10 to 100 mV
Contact Outputs, Controller 1 SPDT; 3 SPST relays
Switching

Voltage/Current/Power

Max 250 VAC / Max 3A / Max 600 VA

Alarm Functions
Function (switchable) Latching / pulse
Pickup delay 0 to 1999 seconds
Switching

Voltage/Current/Power

Max 250 VAC / Max 3A / Max 600 VA

Display

LCD UV coat, backlit 14 segments display with symbols

for status information
Backlight On/Off selection with four level of brightness

control

EMC Specifications

Emitted Interference EN 61 326
Immunity to Interference EN 61 326

Environmental Conditions

Ambient Temp. Operating
Range

-10 to 50 oC (14 to 122 oF)

Rel. Humidity 10 to 95% (non-condensing)

Power Supply

Input 80 to 250 VAC/DC 48/62 Hz
Main Fuse 250 mA anti-surge
Pollution Degree 2
Transient Overvoltage category II

8.2 Specifications for wall mount version

Electrical Data and
Connections

Signal output Two 0/4 to 20 mA outputs for pH/mv and

temperature , galvanically isolated
Load Max.600 Ω
pH / ORP Input BNC (1012 Impedance)
Connection terminal (1 x 3-pins; 8-pin, 9-pin & 13-pin terminal blocks)

Mechanical Specification

Dimensions

144 x 144 x 111.5 mm (5.67 x 5.67 x 4.39 inch)

Weight 745g (unit); 1100g (boxed)
Material PBT
Insulation NEMA 4X, IP 65

8.3 Specifications for panel mount version

Electrical Data And Connections

Signal output Two 0/4 to 20 mA outputs for pH/mv and

temperature , galvanically isolated
Load Max.600 Ω
pH / ORP Input BNC (1012 Impedance)
Connection terminal (1 x 3-pin; 1 x 9-pin & 1 x 19-pin terminal

blocks)

Mechanical
Specifications

Dimensions 175 x 96 x 96 mm ( 6.89 x 3.78 x3.78 inch)
Weight 550g (unit); 950g (boxed)
Material ABS
Insulation IP 54 (front) , IP 40 (housing)

9 ACCESSORIES

9.1 Replacement Unit

Product Description Thermo Scientific

Order Code

Alpha pH 2000 pH/ORP Controller/Transmitter, wall mount
version

TSPHCTP2000W

Alpha pH 2000 pH/ORP Controller/Transmitter, panel
mount version

TSPHCTP2000P

Product Description Eutech Instruments

Order Code

Alpha pH 2000 pH/ORP Controller/Transmitter, wall mount
version

ECPHCTP2000W

Alpha pH 2000 pH/ORP Controller/Transmitter, panel
mount version

ECPHCTP2000P

9.2 Assembly Accessories

Product Description Eutech Instruments

Order Code

pH Combination Electrode with Pt 100 RTD and PMP EC100GTSO05B
pH Combination Electrode with HF resistant glass

(w/o ATC & PMP)

ECARTSOHF05B

pH Combination Electrode with PMP (w/o ATC) ECARGTSO05B
pH Combination Electrode with high temperature

resistance (110

o

C) and high pressure resistance (9

bar) (w/o ATC & PMP)

ECARHTTSO05B

pH Combination Electrode (w/o ATC & PMP) ECARTSO05B
ORP Gold Electrode with PMP but w/o ATC ECHTAUTSO05B
ORP Platinum Electrode with PMP but w/o ATC ECHTPTTSO05B

Note: Above pH/ORP electrodes withstand up to 6 bar pressure except EC­ARHTTSO-05B. These electrodes have integral 5m measuring cable terminating with
a BNC connector.

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.

10 GENERAL INFORMATION

10.1 Warranty

This Controller transmitter is supplied with a one-year warranty against significant
deviations in material and workmanship from date of purchase and a six-month
warranty for probe. Each instrument will have a warranty card with a specific serial
number. The warranty card must be endorsed by the Authorized Distributor at the
point of sale.
If repair or adjustment is necessary and has not been the result of abuse or misuse
within the designated period, please return – freight pre-paid – and correction will be
made without charge. Thermo Scientific/ Eutech will determine if the product
problem is due to deviations or customer misuse.
Out of warranty products will be repaired on a charged basis.

Exclusions

The warranty on your instrument shall not apply to defects resulting from:

• Improper or inadequate maintenance by customer

• Unauthorized modification or misuse

• Operation outside of the environment specifications of the products

10.2 Packaging

The instrument is packaged in a corrugated box with a warranty card, instruction
manual and the following accessories:

Wall mount version

• Plug, nylon, black, 2 pcs

• PG 13.5, cable gland, 3 pcs

• Connectors, 1 each of 3-way (5.08 mm), 9-way(5.08 mm), 13-way (3.5 mm), 8-

way (3.5 mm)

Panel mount version

• Rubber Gasket, 1 pc

• Catch, 2 pcs

• Rod, thread, 2 pcs

• Connectors, 1 each of 3-way (5.08 mm), 9-way (5.08 mm) and 19-way (3.5 mm).

10.3 Return of Goods

Authorization must be obtained from our Customer Service Department or
authorized distributor before returning items for any reason. A “Return Goods
Authorization” (RGA) form is available through our authorized distributor. Please
include data regarding the reason the items are to be returned. For your protection,
items must be carefully packed to prevent damage in shipment and insured against
possible damage or loss. Thermo Scientific will not be responsible for damage
resulting from careless or insufficient packing. A restocking charge will be made on
all unauthorized returns.
NOTE: Thermo Scientific reserves the right to make improvements in design,
construction, and appearance of products without notice.

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 additional
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 Alpha pH 2000 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 controller may be wiped
with a damp, lint-free cloth. A mild household cleaner can also be used if necessary.

11 APPENDICES

11.1 Appendix 1 – Unit fuse and jumper settings

− Caution! Before opening the unit to replace the unit fuse or to set the
jumper for Pt 100 / Pt 1000 temperature sensor, make sure the mains
cable is separated from the power supply.

Wall mounting version

+

2

2

0

K

L10

C64 C61

C63

C65

C62

R76

C60

2

2

0

K

C115
C112
C114

R104
R105

L5

C80

C76

C79

J7

J6 J5

2

2

0

K

2

2

0

K

C71

J1

L6 L7

U6

L9

BR1

U5

2

2

0

K

2

2

0

K

2

2

0

K

2

2

0

K

L5 L4 L2 L1 L3

C44

C

4

3

C

4

5

C53
C54

C

5

5

C

5

2

TS9

TS11

K1 K2

C123

R34 R34C122

Q6

Q10

+

+

R8

R9

C8

R7 C12

C10 C9

Z1

REG5

C109

REG4

REG3

REG2

R83

R85

R84

C

7

5

R102

R

1

0

3

C110

C99

C

1

1

1

U2

Q15

TS8

F1

L13

TS13

K4

T

S

1

2

R92

C81

1003

R28

U13

C120

Z4

+

C82

+

+

+

+

+

+

+

C95

C88

C86

C87

C85

C90

C89

C84

R101

R100

C106

D11

D12

D13

C105

+

+

+

+

+

+

D15

C104

C93

C100

T1

C94

+

C92

C91

C103

C107

C2

C1

X1

D14

R

1

0

C102

C101

R1

REG1

R2

C7

R12

C6

R11

C11

R32

C21

108

+

C21

R32

R36

U7

R24 C16

Q2

R23

R33

C25

R37

C24

C29

C27

C28

R

3

1

R

3

5

C

2

2

C

2

6

R38

C23

C15

R4

R3

R5

R6

D1

C28

C28

Fuse: 250V,
250mA,

Antisurge

Panel mounting version

J4 J4

R

4

4

C

5

5

C

5

9

REG5

REG1

C69

C

6

6

C

6

8

R49
R48

R46

D10

C

7

3

R

4

5

REG7

C

1

0

7

C

1

2

4

C

1

2

5

R

1

0

7

C

1

2

3

U8

R94

C

1

0

4

C

9

1

C

9

2

C

8

5

C

8

9

C

8

8

R

7

7

C

9

0

Q

1

1

Q10

C86

C84

R79

C87

C102

C97

Z3

T

S

7

T

S

8

Q15

C

1

1

2

R

9

5

C

1

1

1

R

9

9

R

1

0

4

C122

R

1

0

5

R101

C110

C115

R100

C109

C

1

0

8

C

1

2

1

C

1

1

9

U9

R

9

8

C113R96

C114

J25

R

1

0

2

R

1

0

3

C

1

2

0

C

1

1

6

R

9

7

C117

C

1

1

8

J4

TS13

F1

TS1

C28

Fuse: 250V ,
250mA,

Antisurge

U6

C57

C40

J3

TS13

C

3

4

+

R39

REG2

+

R43

C49

Q3

+

R41

R40

C38

Z2

+

+

C48

R42

C39

+

C53

C36

C37

+

REG4

C54

+

D11

C58

T
1

R74

C28

C29 C30

L1

+

C31

TS5

K5

+

BR1

J11

R

7

2

R

6

9

R

6

7

R

6

6

C76

D12

D13

R57

K2

C77

TS2

K1

C75

R53

R75

R76R62R59R60

R56

Q6

C80

Q7

D

1

5

D14

R65

R82

R81

C

8

3

R58

C78

R55

R54

Q5

R55 R5 1

Q

5

0

1

R78

R71

Q9

R70

C74

Q4

R50

Q8

R

1

0

6

T

S

1

1

C41

+

C42

+

C44

+

C43

+

+

C62

C

5

2

C

5

1

C

5

0

C

5

6

+

C45

+

+

REG6

C65

C70

C106

+

+

C46

Q14

C35

Z12

C96

+

+

+

C67

C47

+

Q16

C71

REG8

C72

TS12

R93

C

1

0

3

C

1

0

5

8

4

X

2

7

7

4

0

1

M

A

I

N

A

L

P

H

A

p

H

1

1

0

0

R

E

V

0

.

3

C

6

0

REG3

R47
C64

C61
C63

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.

Tempera
ture (oC)

pH 1.00 pH 4.01 pH 6.86 pH 7.00 pH 9.00 pH 9.18 pH 10.01

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

11.3 Appendix 3 –Simple explanation on the function of hysterisis

4 . 0 4.5 9.5 1 0 . 0

7.0

R E L A Y O F F

H Y S T E R E S I S B A N D
( D E F A U L T = 0 . 5 p H )

F O R W A R D D I R E C T I O N

R E V E R S E D I R E C T I O N

S P 1

S P 2

R E L A Y O N

S P 1 S e t t o L O
S P 2 S e t t o H I

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.

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

X

p

=0

Xp =0

SP 1

SP 2

+Xw

-Xw

Yh

0%

50 %

100 %

11.4.2 Control characteristic of P-Controller as proportional controller

MIN Function

MAXFunction

Xp

Prop. Band

Xp

Prop. Band

SP 1

S

P2

+Xw

-Xw

Yh

0%

50 %

100 %

11.4.3 Control characteristic of PI-Controller as a proportional integral
controller

SP1 SP 2

10%
Proportiona l. band
X

P

Prop. band
X

P

20%

25%

100%

50%

11.4.4 Controller signal of Pulse length Controllers

t

ON

t

OFF

Pulse Length T

Relay

ON

OFF

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:
t

ON

+ t

OFF

= T (Const.)

greater divergence Î greater tON
Xp exceeded Î t

ON

= T (relay remains picked up)

11.4.5 Controller signal of Pulse Frequency Controllers

t

ON

t

OFF

Pulse Length T

Relay

ON

OFF

Time [s]

The output relay of the pulse frequency controller is clock-timed. The pulse
duration tON remains constant at 250mS. 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

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

Compensation

R. 20 Value at 20 mA

SP1 Setpoint 1 CU22 Out of range output

current 22 mA
SP2 Setpoint 2 WASH Wash
LO Low limit H. INT Cleaning interval in hours
HI Hi Limit S. DUR Cleaning duration in

seconds
HYS Hysteresis CONF 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 PH ASY Asymmetrical pH mode
PLC Pulse Length Control ORP SY Symmetrical ORP mode
PFC Pulse Frequency Control ORP ASY Asymmetrical ORP mode
P/PI Proportional control AL. D Alarm delay
EN Energized AL.C Alarm Contact
DEEN Deenergized STDY Steady
REL Relay FLET Fleet, impulse
PRP Proportional band GLAS EL Glass electrode
T.PL Pulse length time ANTY EL Antimony electrode
F.PF Pulse frequency time DEF Default
IAT Integral action time FCT DEF Factory default
MANU Manual CAL DEF Calibration default

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All rights reserved. Thermo Fisher Scientific Inc.

68X216830 Rev 4