Thermo Fisher Scientific Alpha TDS 200 - Manual (Page 16)

12
7 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. ATC temperature readings can be offset by
±10
o C.
Important: If there is no temperature element wired to controller and ATC is selected on,
screen will flash in TDS mode, and an error message (OR) is displayed 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 0 to 50
o C. Factory default is 25.0 o C.
See Setup program P4.0 for instructions on ATC or MTC selection.
To offset temperature:
1.
Press MODE to select o C mode. Display shows MTC or ATC, then temperature.
2. Key in password “011” as per procedure in Section 5.
3. The screen will flash current o C reading.
4. For ATC: Determine temperature of solution with an
accurate meter (such as the Temp 5). Press ▲or ▼keys
to offset
o C value on controller display to match value of
the solution you are measuring.
For MTC: Press ▲or ▼keys to offset
o C value on
controller display to match desired value.
5. Press ENTER. The display flashes “DONE” for about 3
seconds and returns to temperature measurement mode
(Relays and 4-2- mA output resume activities as per
previous settings)
22.5
25.0
done
ENTER