Thermo Fisher Scientific Alpha pH 500 - Manual (Page 18)

14
6.3 Temperature Compensation Setting
(Unavailable in ORP mode)
pH values other than pH 7.00 are affected by temperature. Under varying
temperature conditions, use ATC to compensate pH values. If temperature of bath
is constant, and a temperature probe is not available, Manual Temperature
Compensation can be utilized.
6.3.1 Automatic Temperature Compensation
For automatic temperature compensation (ATC), connect ATC probe to transmitter,
as described in Section 2.2.2.
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  or  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  or  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  and  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.
6.3.2 Manual Temperature Compensation
1. Make sure the transmitter is on. Press ENT key and use ▲ or ▼ keys to
select „ SET
o
C
‟.