Shellab SMO28-2 - Manual (Page 17)

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OPERATION (CONTINUED)
Note: Allow the oven to heat to up the set point, and then stabilize there with no change in the
temperature reading for at least a half hour (30 minutes) prior to performing a Temperature
Calibration. This is to ensure the best possible temperature uniformity in the oven chamber.
Note: The open / close position of the dampered vents will affect the temperature performance of
the oven when performing a calibration. It is important to allow the oven to stabilize at its set
point temperature for a half hour with the vents set in position they will be in during normal
use. Failure to do so may result in inaccurate temperature readings.
C ALIBRATING THE U NIT
1. After the unit has stabilized at its set point temperature, place the temperature sensor of a
certified remote reading device inside the oven, as close as possible to the oven chamber’s
geometric center. Secure in place against movement.
Note: Always use an independently certified temperature sensing device that is regularly calibrated
to 0.1°C by a third party to conduct temperature calibrations or verifications.
2. Allow the temperature to re-stabilize after closing the door. The remote reading device’s
temperature measurement should not change for at least 15 minutes.
3. Read the temperature sensor’s display. Compare its reading with the temperature shown in
the
incubator’s Temperature Display.
4. If the independent temperature device’s and the unit’s temperature readings are the same
or fall within the range of your laboratory protocol, the oven is calibrated.
5. If there is a temperature difference between the oven’s display and that of the temperature
sensing device which falls outside your laboratory protocol ’s acceptable range, adjust the
oven’s temperature display to match the independent temperature sensor’s reading by
entering a temperature offset. See the next step. If the door was opened to take a reading,
wait fifteen minutes for the temperature to stabilize before entering the offset.
6. To enter the offset, press and hold both the UP and DOWN arrows simultaneously. The
Temperature Display will begin flashing, displaying the current temperature value. Enter the
offset by adjusting the current value until it matches the independent temperature device’s
reading.
7. After the temperature offset has been selected, wait five seconds. The Temperature
Display will cease to flash, and the offset is now entered into the unit.
8. Allow the oven to stabilize after it adjusts to match the offset. The temperature reading of
the independent temperature device should not change for fifteen minutes when the unit is
stabilized.
9. Read t he temperature sensor’s display. Compare its reading with the temperature shown in
the incubator’s Temperature Display. If the independent temperature device’s and the unit’s
temperature readings are the same or fall within the range of your laboratory protocol, the
oven is now calibrated.
10. If the two readings fall outside laboratory protocol, adjust the oven’s temperature display to
match the independent temperature sensor’s reading by entering a temperature offset.
Allow the oven to stabilize for fifteen minutes again, before comparing the display readings
of the unit and the independent temperature device.