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External Temperature
Sensor (rtd2)
Calibration
(Digital Plus Only)
When using any external sensor (rtd2) for the first time, Thermo recommends a
calibration. This calibration will only affect the temperature read by the external
sensor.
Do not pick calibration points that are outside the safe operating limits of the
fluid in your application. For example with water, 90°C and 5°C would be
typical calibration points.
NOTE:
If it is more convenient, the low-
end calibration can be performed
before doing the high-end.
Run the bath to a suitable high-end
calibration point. Place the sensor and
a calibrated reference thermometer in
the bath. Ensure the fluid temperature
is stabilized. Press and hold the
Sensor button for five seconds. The
controller will display
rtd2.
Press YES
and the controller will display
r2 H
.
Press YES and the display will
alternately flash
r2 H
and the current
probe temperature. Use the arrow
buttons to adjust the temperature to
match the reference thermometer.
Press the SCROLL and NO buttons until
StorE
is displayed, pressing YES
accepts the new value.
Repeat for the low-end temperature. Run the bath to a suitable low-end calibra-
tion point. At the
r2 L
display use the arrow buttons to adjust the temperature
to match a calibrated reference thermometer.
Pressing the SCROLL button after the low calibration will display
StorE
,
pressing YES accepts the new value.
If the SCROLL button is not pressed for 60 seconds the function will time-out
and the changes will not be saved. Pressing Mute will also exit the calibration
and return you to the reservoir fluid temperature display.
NOTE:
Both the high and low temperatures must be entered for a valid calibra-
tion. If power is lost before the procedure is complete, critical data needed for
the calculation of calibration parameters will be lost. After pressing the YES
button at the
StorE
prompt wait several seconds before proceeding to ensure
that a bad calibration message does not appear. Premature use of the keypad
after pressing the YES button may cancel the bad calibration error message.
Maintenance
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Sensor
