This manual serves to explain the use of the αlpha pH 200 controller/transmitter.
This manual functions in two ways: first, as a step-by-step guide to help you
operate the meter; second, it serves as a handy reference guide.
This manual is written to cover as many anticipated applications of the αlpha pH
200 controller/transmitter as possible. If there are doubts in the use of the αlpha
pH 200 controller/transmitter, do not hesitate to contact the nearest Eutech
Instruments Authorized Distributor.
Eutech Instruments cannot accept any responsibility for damage or malfunction to
the controller/transmitter caused by improper use of the instrument. Remember to
fill in the guarantee card and mail it mail to your Authorized Distributor or Eutech
Instruments Pte Ltd.
The information presented in this manual is subjected to change without notice as
improvements are made, and does not represent a commitment on the part of
Eutech Instruments Pte Ltd.
Thank you for purchasing a pH 200 ⅛ DIN pH/ORP Controller. This controller is
part of a series of quality process controllers available from Eutech Instruments.
These sturdy, economical pH/ORP controllers are designed with the features and
reliability of a much more expensive instrument.
Your controller includes:
• Removable terminal blocks for easy connections;
• Two mounting brackets for easy panel mounting;
When shipped, the controller is set to the pH mode. See Setup program P3.1 for
directions on selecting ORP mode.
Some features of this controller are:
• Two set point, two SPDT relay operation
• Scrolling, 14-segment LED guides user easily through setup functions
• Reliable power supply from 85 to 260 V AC, 50/60 Hz or DC withstands
voltage fluctuations
• Push-button operation from the front panel
• Two-point pH calibration, offset temperature and ORP calibration
• Adjustable hysteresis band prevents rapid contact switching near set-point
• Selectable automatic or manual temperature compensation
• Two-level password protection
• Removable terminal strips for quick and easy connections
• Non-Volatile memory retains setup even if power fails, and lets you configure
unit before installation
•Isolated 4-20 mA output for remote monitoring or hard copy recording
- 1 -
2 SAFETY INFORMATION
The Eutech Controller/Transmitter shall be installed and operated only in the
manner specified in the Instruction manual. Only skilled, trained or authorized
person should carry out installation, setup and operation of the instrument.
Before powering up the unit, make sure that power source it is connected to, is as
specified in the top label. Failure to do so may result in a permanent damage to the
unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that
the power to the unit is off and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those
as specified in the manual.
The degree of protection against electric shock will be achieved only by
observance of the corresponding installation rules.
- 2 -
3 OVERVIEW
3.1 Front Panel
The front panel consists of a 4-digit LED display, 8 LED annunciators and 4 keys.
Annunciators
1. REL 1 Displayed when Relay 1 is activated
2. REL 2 Displayed when Relay 2 is activated
3. MEAS Displayed in measurement mode
4. CAL Displayed in calibration mode
5. SETUP Displayed in setup mode
6. pH Unit of the displayed parameter (pH)
o
C Unit of the displayed parameter (temperature)
7.
8. mV Unit of the displayed parameter (ORP)
Keys
9. MODE Use to toggle between measurement
modes (pH/ORP and temperature)
10. ENTER Press to confirm changes or to enter into
further levels of the lower menu
11. ▲ / ▼ (increment /
decrement)
Use during calibration and setup modes to
increment or decrement . Press both keys
together in calibration and setup modes to
escape to Measurement mode
12. Full 14-segment display
- 3 -
3.2 Back Panel
A
A
The back panel consists of four different connectors that can be used with
removable terminal blocks (included):
19
18
171916815714613
D
B
J2
pH/ORP
WARN ING
12
11
+
-
4 - 20 mA
4 - 20 m
RELAY 1 - NO
NCNCNC
54
RELAY 1 - POLE
RELAY 2 - NO
RELAY 1 - NC
RELAY 2 - POLE
RELAY 2 - NC
LIQUID GND
Pt 100 - GND
NC
3
GROUND
J3
Pt 100 - IN
Pt 100 - SENSE
210
N
C
J1
L
A. 3 pin connector (for power supply)
B. 9 pin connector (for relays)
C. 7 pin connector (for temperature sensor)
D. BNC connector (for pH or ORP electrode)
A. 1. L- Live
2. N- Neutral
3. E- Earth Ground
B.
4. Liquid GND
5. RELAY 2- NC
6. RELAY 2- POLE
7. RELAY 2- NO
8. RELAY 1- NC
9. RELAY 1- POLE
10. RELAY 1- NO
11. – 4 to 20 mA
12. +4 to 20 mA
C. 13. Pt 100- SENSE
14. Pt 100- IN
15. Pt 100-GND
16. NC
17. NC
18. NC
19. NC
D. BNC for pH/ORP
- 4 -
3.3 Wiring
Caution: Ensure electrical mains is disconnected before proceeding.
1. Connect the power supply to the three-pin terminal block (D)
• VAC protective ground wire = 3
• VAC neutral wire = 2
• VAC live wire = 1
The alpha pH 200 controller accepts voltages from 85 to 260 VAC, 50/60 Hz or
DC.
2. Connect the Pt 100 leads to terminals 13 and 15 (terminal block B). Either wire
can be connected to either terminal. Terminals 13 and 14 must be shunted
unless using a 3-wire RTD.
NOTE: pH 200 is factory set for manual temperature compensation. ATC can be
selected in Program P3.3.
3. Slide the BNC connector of the pH (ORP) probe to the BNC connector on the
back of the controller.
Turn the notches of the connector until they lock into place.
4. Power on the controller. The display automatically shows the pH (ORP) reading,
and the pH (ORP) annunciator lights.
NOTE: In the event Pt 100 is not connected or the connection is broken in the ATC
mode, the pH/ORP display flashes to alert you.
- 5 -
3.4 Panel-mounting the controller
a
d
The supplied mounting hardware allows surface mounting to all panels and
protective enclosures. Mounting cut-out size is 91 x 45 mm.
To attach the mounting to the controller:
1. Align the catch to the side of the controller, and insert threaded rods through
catch.
BACK VIEW
2. Screw the threaded-rod through the catch in a clock-wise direction. Tighten
until the catch holds the controller firmly against the back of the panel or
protective housing. Repeat on the other side.
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a
C
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c
t
a
C
2
0
.
TOP VIEW
SIDE VIEW
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4 MEASUREMENT MODE
Press MODE to toggle between:
• pH (or ORP) measurement mode
• Temperature measurement mode
pH (ORP) measurement mode
The controller starts up in the mode when last powered off (pH or ORP). The
appropriate annunciator lights up.
NOTE: Select pH or ORP measurement mode in Setup program P3.1.
Temperature Measurement mode
Press MODE key once to view the temperature measurement. The display shows
ATC (Automatic Temperature Compensation) or MTC (Manual Temperature
Compensation), then the current measured temperature. The
when you are measuring temperature.
See Setup program P3.3 for further instructions.
o
C annunciator lights
- 7 -
5 PASSWORD
To access Calibration and Setup functions, you need to enter a password code.
You cannot change calibration and setup parameters unless you first enter the
password.
The alpha pH 200 controller features two separate passwords:
• pH (ORP) calibration mode password = 011
• Setup program password = 022
To enter the password:
1. Press ENTER twice. The display reads “P.000”. The first “0” flashes.
2. Press ENTER again to leave the first digit “0” and to scroll to the next
number.
3. Press the ▲ and ▼ keys to change the second digit to the correct number
(1 or 2). Press ENTER.
4. Press the ▲ and ▼ keys to change the third digit to the correct number (1
or 2). Press ENTER. The whole display will now flash to prompt for its
confirmation.
If you enter an incorrect digit, press MODE to back up.
5. Press ENTER again to confirm your password. You are now in Calibration
mode or Setup mode, depending on password entered.
- 8 -
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