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5 25.0 done – Thermo Fisher Scientific Alpha COND 190 (In the process of updating the brand guideline & product image) User Manual

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13

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 conductivity 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.

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 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 measurement
mode.

22.5

25.0

done

ENTER