21
ROUTINE MAINTENANCE
Calibration of temperature sensor
The temperature sensors are attached to the monitor bottles. Follow the following instructions for proper
calibration (zero adjustment):
1.
Remove the monitor bottle cover as shown in the figure.
2.
Remove the sensor to be calibrated from the monitor bottle.
(Please note that model MBR-1404GR also have a sensor for
the temperature recorder in the left side of the upper monitor
bottle.)
3.
Prepare a bottle or beaker with a solution of crushed ice and cold water. Agitate the mixture
thoroughly.
4.
Put the sensor to be calibrated in the mixture.
5.
While continuously agitating the ice water mixture, monitor the temperature indicated on the display of
the sensor to be calibrated.
6.
Wait for the temperature on the display to stabilize. If the display is not 0
o
C calibrate using the
following procedure. If the display does indicate 0
o
C proceed to step 7.
1) Press the CAL key for approximately 5 seconds until C00 is displayed.
2) Enter the code of the probe to be calibrated using the numerical shift key. Upper temperature sensor
code is C01. Lower temperature sensor code is C02.
3) Press the CAL key. This makes temperature display 0
o
C.
4) The digital display will revert back to actual chamber temperature. The calibration that was entered in
the previous step should now have an effect on the temperature display. The digital display should
show now indicate 0.0, if not, repeat step 6.
7.
Take the sensor out of the ice water solution and wipe with a soft cloth.
8.
Attach the sensor back into the monitor bottle by reversing the procedure in steps 1 and 2.
* For the span adjustment, contact a service personnel.
