External Temperature Sensor (Rtd2) Calibration - Thermo Scientific Neslab EX-7 Installation, Operation, Basic Maintenance

External Temperature
Sensor (rtd2)
Calibration
(Digital Plus Only)
XX.X
Hold for 5 seconds
Sensor
rtd2
r2 H
Yes
No
No
r2 L
No
No StorE
Accept All Changes
Yes
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When using any external sensor (rtd2) for the first time, Thermo Fisher recom-
mends 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.
200.0
r2 H
Yes
Yes
-40.0
r2 L
Yes
Yes
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.
- 37 -
NOTE: If it is more convenient, the low-
end calibration can be performed
before doing the high-end.
No
Run the bath to a suitable high-end
calibration point. Place the sensor and
Yes
a calibrated reference thermometer in
the bath. Ensure the fluid temperature
No is stabilized. Press and hold the
Sensor button for five seconds. The
controller will display rtd2. Press YES
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.