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 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.
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
