EUTECH INSTRUMENTS ALPHA PH 500 PHORP 2-WIRE TRANSMITTER (REVISION 1), Instruction Manual, Page: 16 / 28

13
5.3 Temperature Compensation Setting
(Unavailable in ORP mode)
pH values other than pH 7.00 is affected by temperature. Under varying temperature conditions, use
ATC to compensate pH values. If temperature of bath is constant, then select Manual Temperature
Compensation.
5.3.1 Automatic Temperature Compensation
For automatic temperature compensation (ATC), connect ATC probe to transmitter, as described in
Section 3.2, page 5.
1. Press ENT key to enter SETUP mode. Press
▲ or ▼
keys to scroll through sub-menus till
LCD displays ‘
SET
o
C
’. Press ENT.
2. Display shows ‘
ATC On
’ or ‘
ATC Off
’. Use S or T keys to select ‘
ATC On
’, and press
ENT.
3. Dip ATC probe into a solution of known temperature (i.e. a temperature bath). Allow time for
temperature probe to acclimatize with surrounding bath temperature. If temperature readings
are inaccurate, calibrate temperature probe as described in steps 4 and 5.
If temperature readings are correct, press ENT key and go to step 6.
4. Use
S
or
T
keys to adjust correct temperature value (i.e. temp. of temp. bath). Readings can
be adjusted in increments of 0.1
°
C. Maximum adjustments allowed is ± 5
o
C.
5. Once you have adjusted the correct temperature, press ENT key.
6.
Press
S and T keys together, to return to MEAS mode.
The ATC indicator will light up on the LCD.
NOTE: If you are using a temperature probe, the probe must be submersed in the
liquid you are measuring.
5.3.2 Manual Temperature Compensation
1. Make sure the transmitter is on. Press ENT key and use
▲ or ▼
keys to select ‘
SET
o
C
’.
2. Press ENT key. Primary display shows ‘
ATC
’ and secondary display shows ‘
On
’ or ‘
OFF
’.
Use
▲ or ▼
keys to select ‘
ATC Off
’. Press ENT.
3. Primary display shows temperature (default is 25.0), and secondary display shows
‘
P
o
C
’.Check temperature of your sample/process, using an accurate thermometer.