58
360093-1/H
Platelet Incubator Operation Manual
7.6
Calibrating the temperature controller readout
NOTE:
Refer to the policy for your organization to determine how much variance is
acceptable. If the variance is within acceptable limits for your organization, you
may not need to change the offset value.
To ensure that the high and low temperature alarms are activated properly, the chamber temperature that is
read by the temperature control probe must be accurate.
The Monitor Offset is used to calibrate the displayed temperature with the measured temperature. If the
temperature that is displayed on the monitor does not match the actual chamber temperature, as measured
with an independent thermometer, you can change the setting for the Monitor Offset so that they match.
The default value varies for each incubator. The monitor offset can be changed to a value from -100 °C to
+100 °C, inclusive. Values in increments of 0.1 °C can be selected within the range of -10.0 °C to +10.0 °C.
You must have the following to complete this procedure:
►
Thermometer. The thermometer must be independent of the incubator, and be calibrated and traceable
according to the policy of the National Institute of Standards and Technology (NIST), or to the equivalent
national or international measuring equipment standards as identified in regulations for your organization.
To calibrate the temperature controller readout
1
Verify that the incubator has been placed properly, and allow it to run for at least 30 minutes to stabilize
the chamber temperature. For more information, see Section 3.3, “Selecting an appropriate location.”
2
Measure the temperature of the chamber with the independent thermometer.
a
Place the independent thermometer in the chamber in the appropriate location, as follows:
Model
Location
PC100
Front, top right corner
PC900, PC1200
Back, right bottom corner
PC2200, PC3200
Next to the temperature control probe
PC4200
In the middle drawer on the right side
b
Allow the chamber temperature to stabilize. This may take as long as 30 minutes.
c
Obtain the reading from the independent thermometer.
3
Determine how to adjust the offset value.
a
Compare the reading from the thermometer to that on the monitor.
►
Example 1 (monitor reading is too high): the monitor reading is 23.0 °C, and the thermometer
reading is 22.5 °C
►
Example 2 (monitor reading is too low): the monitor reading is 21.0 °C, and the thermometer
reading is 22.0 °C
b
Determine how much to increase or decrease the offset value to make the monitor reading match
the thermometer reading.
►
Example 1: decrease by 0.5 to match the thermometer reading.
►
Example 2: increase by 1.0 to match the thermometer reading.
4
On the temperature controller, enter Level 3 program mode.
a
On the temperature controller, enter Level 1 program mode by pressing and holding the Up and Down
arrow buttons simultaneously for about three seconds until tunE and OFF flash on the display.
b
Press and release the Up or Down arrow button until the LEUL parameter and its value flash on the display.
c
While holding the button on the left (*), use the Up and Down arrow buttons to change the value to 3.
d
Release all the buttons. LEUL and 3 flash on the display. The temperature controller is now is
Level 3 program mode.
