EUTECH INSTRUMENTS ALPHA PH 800 PHORP CONTROLLERTRANSMITTER User manual

EUTECH INSTRUMENTS
α
αα
αlpha-pH800
pH and ORP Controller/Transmitter
Operating Instructions
68X216813
03/99

Preface
Thank you for purchasing the αlpha-pH800 series pH/ORP
controller/transmitter.
This manual serves to explain the use of the αlpha-pH800 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-pH800 pH/ORP
controller/transmitter. If you have doubts in the use of the instrument,
please do not hesitate to contact the nearest Eutech Instruments’
Authorised Distributor.
The information presented in this manual is subject to change without
notice as improvements are made, and does not represent a commitment
on part of Eutech Instruments Pte Ltd.
Eutech Instruments cannot accept any responsibility for damage or
malfunction of the unit due to improper use of the instrument.
Copyright 

1999 Eutech Instruments Pte Ltd. Version 1.0. All
rights reserved.
Eutech Instruments Pte Ltd. Blk 55, Ayer Rajah Crescent #04-14/24,
Singapore 139 949. Tel: [phone]; Fax: [phone]; e-mail:
[email protected]; Home page: http://www.eutechinst.com

TABLE OF CONTENTS
1 INTRODUCTION................................................................................................ 1
1.1 Description of Unit.................................................................................... 1
1.2 Applications................................................................................................ 2
2 ASSEMBLY AND INSTALLATIONS............................................................. 3
2.1 Measurement and Control System........................................................ 3
2.2 Unit Dimensions....................................................................................... 3
3 ELECTRICAL CONNECTIONS....................................................................... 4
3.1 Connection Diagram................................................................................ 4
3.2 Back Panel................................................................................................ 6
4 OVERVIEW....................................................................................................... 8
4.1 Keypad and Display................................................................................. 8
Function Groups................................................................................................... 9
4.2 Control Concept....................................................................................... 9
5 MEASUREMENT............................................................................................ 10
5.1 Display in Measurement mode............................................................ 10
6 CALIBRATION............................................................................................... 11
6.1 pH Calibration......................................................................................... 11
6.2 ORP – mV Calibration........................................................................... 13
7 ADVANCED SET UP MODE......................................................................... 14
7.1 Electrode Offset (OFS) sub-function................................................... 14
7.2 Setting temperature (Set oC) sub-function ......................................... 15
7.3 Control Relay A/Control Relay B (SP1/SP2) sub-function............... 18
7.4 Configuration (ConF) sub-function...................................................... 22
7.5 Calibration (CAL) sub-function............................................................. 23
8 TECHNICAL SPECIFICATIONS................................................................... 24
9 ACCESSORIES ............................................................................................... 25
10 GENERAL INFORMATION....................................................................... 25
10.1 Warranty.................................................................................................. 25
10.2 Packaging ............................................................................................... 25
10.3 Return of Goods..................................................................................... 26
10.4 Guidelines for Returning Unit for Repair ............................................ 26
11 APPENDICES.............................................................................................. 27
11.1 Appendix 1.............................................................................................. 27
11.2 Appendix 2.............................................................................................. 28
11.3 Appendix 3.............................................................................................. 29

1
1 INTRODUCTION
1.1 Description of Unit
Thank you for purchasing Eutech’s ¼ DIN alpha-800 series pH/ORP
process controllers. This unit is used for measuring either pH or ORP
parameter one at a time, and the operational mode is switchable from the
menu. You can use this unit to measure pH or ORP with limit control.
This controller has many user-friendly and safety features which include:
•Menu-driven program that simplifies set-up
•Built-in non-volatile memory backup to ensure that calibration and
other information are not erased if power supply fails
•Push-button two-point calibration and electrode offset
adjustment from the keypad
•Automatic temperature compensation (ATC)
•Manual temperature compensation setting without the ATC probe,
with independent setting for calibration and process temperature
•0 to 2000 second time delay adjustment on all relays – minimise
false alarms
•Separately adjustable high and low set point hysteresis (dead
bands) prevent chattering of relays around the set points
•Asymmetrical/symmetrical input for pH/ORP operation
•Large dual display LCD for easy reading with clear multiple
annunciators, alarm status, operational and error messages
•Two switching contacts as set-point triggering relays
•Hold function freezes output current (4/20mA) and control relays
•LED indicators signal control activities to monitor controller status
from a distance
•Protection against electromagnetic interference – Input and
output are free from external inference

2
1.2 Applications
Use this controller in panel mounted enclosures for applications such as
water treatment and monitoring, galvanic-decontamination, chemical
processing food processing, clean or waste water control and
neutralisation process.

3
2 ASSEMBLY AND INSTALLATIONS
2.1 Measurement and Control System
A typical measurement system consists of:
•a pH/ORP process controller
•a pH/ORP combination electrode with integrated or separate
temperature sensor Pt 100/1000,
•an immersion, flow or process assembly with or without a potential
matching pin (PMP)
•a final control element such as pump or valve
•a recorder
2.2 Unit Dimensions
The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front).
max. 175 max. 45
Mountin
g
Cut-Out
Flat Gasket
(
1mm
)
(
To be Inse
r
ted B
y
Custome
r
)
Note: The Taped Corners Have to Be On Top
92
32
56
96
92 + 0.5
92 + 0.5
Power Mains
(
2
2
0
/
1
1
0
V
A
C
)
Flow Assemb
Measurement Cable
w
i
t
h
E
l
e
c
t
r
o
d
e
er
l
y
P
r
o
c
e
s
s
A
s
s
e
m
b
l
y
Chart Record
p
H Controller

4
3 ELECTRICAL CONNECTIONS
3.1 Connection Diagram
Signal OutputHold Input
Relay B
Relay A
Po
w
er Mains
pH
m
A
-+
PE/S
PE
AC: NL
125
4
36
78 9 10 11 12 13 14 15 17
15 16
* ) indicated contact positions are for currentless conditions
Pt 100 Potential Matching Pin (PMP) Signal Input pH/ORP
S/
V
PE/S
pH
18 19 20 21 22
S/S/
BNC

5
Symmetrical high-impedance
connections
Asymmetrical connections
Measuring Cable
pH Combination
Electrode
Temp. pH
BNC
0/PA
PE NLS
22 21
1
2
320 19 18
Potential
Matching Pin (PM)
S
Measuring Cable
pH Combination
Electrode
Temp. pH
BNC
0/PA
PE NLS
22 21
1
2
320 19 18
Potential
Matching Pin (PM)

6
3.2 Back Panel
The back panel consists of two connectors. The first connector is the 17-way
PCB edge connector and the other is the 5-way connector.
Connection for the 17-way screw terminals (from left to right):
1.AC mains live wire 10.No connection
2.AC mains neutral wire 11.No connection
3.AC mains protective earth wire 12.No connection
4.Low set relay resting position (NC) 13.Hold function switch terminal 1
5.Low set relay common 14.Hold function switch terminal 2
6.Low set relay working position (NO) 15.No connection
7.High set relay resting position (NC) 16.4 - 20 mA for -ve connection
8.High set relay common 17.4 - 20 mA for +ve connection
9.High set relay working position (NO)
Connections for the 5-way screw terminals:
18. Pt100/Pt1000 lead 1 terminal
19. Pt100/Pt1000 sense lead terminal
20. Pt100/Pt1000 lead 2 terminal
Note: If using a two-wire RTD, short terminal 19 to terminal 18.
Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100.
See Appendix 1 for directions on switching the RTD type.
21. pH/ORP (potential matching pin)
21. pH/ORP (shield)

7
0V
/
Pt100
/
RELAY A
LNPE
100mA (F)
FUSE 250VAC
HOLD
RELAY B
Pt1000 P
A
LS
/
NC -+
NC NCNC

8
4 OVERVIEW
4.1 Keypad and Display
4.1.1 Keypad
•Perform rapid 2-point calibration and view electrode status
•Allows entry to Set up mode
•Select individual functions within the function group of Set up
mode
•Store input data in the Set up mode
•Start calibration in the calibration mode
•Select various function groups in the Set up mode.
•Set parameters and numerical values in sub functions of Set
up mode
If pressed continuously, the setting speed increases
•Return to the Measurement mode when both keys are pressed
together
4.1.2 Display
The LCD display features two numerical displays that show status messages
and measured values for easy, quick reference. The display provides short-
text information for setting parameters and configuration.
•
••
•MEAS: Measurement mode
•
••
•SETUP: Set-up mode of function groups
•
••
•CAL: Calibration mode of pH/ORP
•
••
•READY: Comes on after a successful
calibration
•
••
•HOLD: Relay position and current output
are frozen
•
••
•ATC: Comes on in the ATC mode.
Disappears in the Manual temperature
Compensation mode.
“ATC” flashes if the temperature probe is
faulty in its ATC mode
•Display for RELAY A/B. Green LED indicates measured
value within limit while RED LED indicates measured value
outside limit.
•Alarm display if limit value overshoot or the ATC probe fails.
7.00
25.0 ATC
SETUP
HOLD
CAL
MEAS CON
READY pH
oC

9
Function Groups
The main function and sub-function groups are organised in a matrix format
for configuration and selection of parameters. The main function groups are:
1) Offset adjustment (OFS)
2) Temperature Measurement / compensation settings (Set oC)
3) Control relay 1 configuration (SP1)
4) Control relay 2 configuration (SP2)
5) Configuration (ConF)
6) Calibration (CAL pH)
4.2 Control Concept
The main function and sub-function groups are organised in a matrix format
as shown below. These functions can be accessed via the front keypad for
configuration and selection of parameters.

10
5 MEASUREMENT
5.1 Display in Measurement mode
When the controller is initially powered on, it automatically enters into the
Measurement mode after the large dual LCD displays all segments briefly.
The upper display shows the measured pH or ORP value, while the lower
display shows either the temperature value if the controller is set for pH
measurement or “OrP” if it is set for ORP measurement.
Annunciators at the right side of the display indicate whether the controller is
set for pH or mV measurement..
Similarly annunciators or icons at the top or left side of the display shows the
current status of controller, e.g. “MEAS”, “SETUP”, “CAL”, “READY”, etc. In
addition, error messages also guide the user in time of any faulty conditions
as indicated by “ERR” or icons flashing.
5.1.1 Check electrode performance
To read current electrode slope and offset values:
1) Press the CAL key followed by the ENTER key. The upper display
shows electrode slope. The lower display reading shows the pH reading at 0
mV.
2) Press the ∆
∆∆
∆and ∇
∇∇
∇keys to return to Measurement mode.

11
6 CALIBRATION
Direct Calibration from the Measurement mode is possible via the CAL key.
The Calibration procedure can also be accessed from the Advanced Setup
mode.
6.1 pH Calibration
This unit features five preset buffer values (1.00, 4.00, 6.86 or 7.00, 9.00,
9.18 and 10.00) for quick, two-point auto calibration. When calibrating this
instrument, standard pH buffer solutions must be used.
1) Enter Calibration mode. While in the
Measurement mode, push the CAL key. The upper
and lower display reads “CAL” & “pH”. Push the
ENTER or CAL key again. The controller displays
the electrode status based on the previous
calibration. Electrode slope and offset information is
displayed.
NOTE: If the display reads “CAL OrP”, see section
7.4 for procedures on how to switch from ORP to pH
readings.
2) Press the ENTER key again to begin
calibration. The “CAL” indicator appears at the top of
display and the buffer indicator appears in the bottom
left corner of the display. The upper display is the on-
line pH value as measured by the electrode. The
lower display indicates the first compulsory
calibration value, pH 7.00 (or 6.86).
3) Immerse the clean electrode in the buffer solution.
In ATC, the temperature probe must also be
immersed in the buffer solution. Likewise for
HOLD 6.96 pH
7.00 pH
CAL
4.02 pH
4.00 pH
SETUP
HOLD
CAL
59.0 mV
7.00 pH
READY
HOLD
CAL
CAL
PH
SETUP
HOLD
57.2 mV
6.88 pH
READY
HOLD
CAL

12
symmetrical mode, immerse the potential matching pin in the buffer.
4) Press the ENTER key to start the calibration at pH 7 (or pH 6.86). The
electrode indicator and CAL indicator both flash. The controller automatically
adjusts the reading to match the buffer value.
5) The lower display will now show its next lower ‘pH’ buffer. Use ∆
∆∆
∆and ∇
∇∇
∇
keys to select the second buffer from one of the 5 remaining preset values.
Remove the electrode from the first buffer, wash and then immerse into the
second buffer, Once the upper display stabilises press the ENTER key, the
electrode and CAL indicator will flash. The controller adjusts the reading to
the buffer.
6) After calibrating to a second buffer value, the controller automatically
displays electrode slope and offset. The zero point and slope are re-
determined after each calibration.
7) Press the ENTER key. If the calibration mode was accessed using the
CAL key, the controller will return to the Measurement mode. If the
calibration mode was accessed from the Advanced Set-up mode, the
controller will return to the sub-function menu.
Note: If there is a calibration error, the controller displays “ERR”. If this
happens, push both and (escape) to restart the calibration beginning from
step 1.
Note: When calibrating with manual temperature compensation, the
controller automatically changes from the preset process temperature to the
calibration temperature. After leaving the Calibration mode, the controller
switches back to process temperature (for setting the calibration temperature
and the process temperature, see section 7.2.3).

13
6.2 ORP – mV Calibration
This mode allows one-point calibration.
1) Enter Calibration mode. While in Measurement
mode, push the CAL key. Press the ENTER key.
The upper and lower display reads “CAL OrP”.
Note: If the upper and lower display read “CAL PH”,
see section 7.4 for procedures on how to switch from
pH to ORP mV readings.
2) Place sensor in the ORP solution.
3) Press the ENTER key to begin calibration. The
“CAL” indicator appears on the display. The upper
display shows the current mV output of the electrode
without any offset adjustment.
4) Press the ∆
∆∆
∆and ∇
∇∇
∇keys to adjust the mV value to that of the standard
solution.
5) To confirm, press the ENTER key. The controller calculates the
correction factor and returns to the Measurement mode.
CAL
OrP
SETUP
HOLD
226 mV
C
HOLD
CAL

14
7 ADVANCED SET UP MODE
7.1 Electrode Offset (OFS) sub-function
This option is available only in the pH mode. An allowance of ±120mV is
allowed to correct for electrode deviations. This feature is useful for
prolonged on-line applications.
The controller will add or subtract the value from the measured pH and
display the correct value. Should the offset value be too high, consider
performing maintenance on the electrode followed by calibration. If the
calibration is unsuccessful, please replace the electrode.
1) Take a sample from the system and note the pH
reading displayed on the controller.
2) Measure the pH of the sample using a calibrated
pH tester, hand-held meter, or bench meter. Record
the correct pH value.
3) Enter Advanced set-up mode. Press ENTER.
4) Press the ∆
∆∆
∆or ∇
∇∇
∇keys to scroll until the upper
display shows OFS.
5) Press the ENTER key. The SETUP annunciator appears at the top of the
display. The lower display shows the on-line measured pH value. The upper
display shows the current offset value.
6) Press the ∆
∆∆
∆or ∇
∇∇
∇keys until the pH value coincides with the correct pH
value noted in Step 2. As the ∆
∆∆
∆or ∇
∇∇
∇keys is pressed to adjust the pH value,
the ‘offset’ value in the upper display also changes.
7) Press the ENTER key to enter the offset value.
Note: The offset value is reset during full calibration. See section 6 for full
calibration instructions.
Note: The offset parameter is blanked out during ORP operation.
SETUP
SETUP
HOLD
HOLD
Ofs
OfsOfs
Ofs
-0.05
-0.05-0.05
-0.05
7.00

15
7.2 Setting temperature (Set oC) sub-function
7.2.1 Selecting automatic or manual temperature compensation
1) Enter Advanced Set-up mode by pressing the ENTER key.
2) Press the ∆
∆∆
∆or ∇
∇∇
∇keys to scroll until the
display shows “Set oC”.
3) Press the ENTER key. The lower display
shows “Atc”; the upper display shows “on” or
“oFF” depending on whether or not ATC is
selected.
4) Press the ∆
∆∆
∆or ∇
∇∇
∇keys to toggle between
ATC on and off.
5) Proceed with additional Advanced Set-up
procedures (press ENTER again) or return to
Measurement mode by pressing the ∆
∆∆
∆and ∇
∇∇
∇
keys (escape) simultaneously.
7.2.2 Temperature calibration (ATC mode only)
1) Select “ATC on” as described above in
Section 7.2.1.
2) Press the ENTER key. The upper display
indicates the current temperature offset. The
current measured temperature is shown in the
lower display.
3) Compare the current measured temperature
on the controller display to a thermometer
known to be accurate. Note down the correct
temperature value.
0.0
0.00.0
0.0
25.0 ATC
SETUP
HOLD oC
on
onon
on
Atc
SETUP
HOLD
oFF
oFFoFF
oFF
Atc
on
onon
on
Atc
SETUP
HOLD
SETUP
SEt
SEtSEt
SEt
o
oo
o
C
CC
C
SETUP
HOLD
HOLD

16
4) Press the ∆
∆∆
∆or ∇
∇∇
∇keys to scroll the lower display to match the correct
value. The upper display will now show the offset value. You can offset
temperature up to ±5oC.
5) Press the ENTER key to confirm your selection.
6) Continue with additional Advanced Set-up procedures, or return to the
Measurement mode by pressing the ∆
∆∆
∆and ∇
∇∇
∇keys (escape) simultaneously.
7.2.3 Setting manual temperature compensation
Note: This option is not available when the controller is set for ATC
operation.
For manual temperature compensation, two
different temperatures: process and
calibration, can be input independently. This
allows calibration at a temperature other than
the process temperature. Example: setting a
calibration temperature of 25oC allows
calibration using standard buffer solutions at
25oC, even if the process temperature is
different.
1) Select “ATC oFF” as described above in
section 7.2.1
2) Press the ENTER key. The upper display
shows the current process temperature and the lower display shows “P.oC”
to indicate process temperature.
3) Press the ∆
∆∆
∆or ∇
∇∇
∇keys to adjust the process temperature value, between
–9.9 and 125oC.
4) After setting the process temperature value, press the ENTER key. The
upper display shows the current calibration temperature and the lower
display shows “C.oC”.
25.0
25.025.0
25.0
C.C
SETUP
HOLD
oFF
oFFoFF
oFF
Atc
SETUP
HOLD
25.0
25.025.0
25.0
P.C
SETUP
HOLD