Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 22)

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8 TEMPERATURE CALIBRATION
IMPORTANT: When Calibration mode is entered, controller
automatically goes into a “HOLD” mode where the 4-20 mA output
freezes and relays are de-activated (if it was in an activated
condition). Upon return to measurement mode, both 4-20mA output
and relay activities resume, depending on settings.
This controller features selectable Automatic Temperature
Compensation (ATC) or Manual Temperature Compensation
(MTC).
ATC: ATC mode requires a Pt 100 temperature element. ATC
automatically compensates for temperature fluctuations. You can
offset your ATC temperature reading by ±10
o C.
Important: If there is no temperature element wired to the controller
and ATC is selected on, the screen will flash in pH or ORP mode,
and you will see an error message (OR) in temperature mode.
MTC: MTC lets you select a specific value at which temperature will
be compensated. You can select a manual temperature value from
– 10 to 110
o C. Factory default is 25.0 o C.
See Setup program P3.3 for instructions on ATC or MTC selection.
To offset temperature:
1. Press MODE to select
o C mode. The display shows MTC or
ATC, then the temperature.
2. Press CAL / ENTER key to directly access the offset mode
when the unit is in temperature measurement mode.
NOTE: Instead of pressing the CAL/ENTER key, you can also enter
the offset mode using the password code procedure as explained in
Section 5.
3.
The screen will flash the current o C reading.
4. For ATC: Determine the temperature of your solution with an
accurate meter (such as the Temp 5).
Press the ▲ or ▼ keys to offset the
o C
value on the controller display to match the
value of the solution you are measuring.
For MTC: Press the ▲ or ▼ keys to offset
the
o C value on the controller display to
match the desired value.
5. Press ENTER. The display flashes “DONE”
and return to the temperature measurement
mode.
22.5
25.0
done
ENTER