Thermo Scientific IMP 180, Manual

Page: 97 / 118

Maintenance
Preparing Temperature Calibration
Thermo Scientific Heratherm IMP 10-3
Preparing Temperature Calibration
To determine the exact measured value of the refrigerated incubator’s integral temperature
sensor, a temperature comparison measurement must be performed every three months. If a
major temperature deviation is found during this check, temperature calibration is required.
During this process, the temperature controller of the refrigerated incubator is set to the value
measured during the temperature comparison measurement.
Use a calibrated measuring instrument with an accuracy of < ± 0.1 °C (0.18 °F) for this test.
To minimize temperature variations during the measurement, put the measuring sensor in an
isothermal container (such as a bowl filled with glycerol) before placing it in the work space.
Use the center of the work space as the reference location for the comparison measurement.
Comparison Measurement Procedure
1. Turn the refrigerated incubator on using the power switch.
2. Set the temperature set value and allow the refrigerated incubator to stabilize. This may
take several hours.
3. Place the measuring device in the center area of the work space. Alternatively, a
temperature sensor may be positioned in this location. Route the connecting cable
between the glass panel and the interior tank.
4. Close the doors.
5. Wait until the temperature value displayed on the measuring instrument has stabilized.
6. Use the temperature reading from the measuring device to calibrate temperature control
manually, as explained “Entering the Calibration Reference Temperature Manually” on
page 7-23 .
Isothermal container
Do not use a container filled with water as an isothermal container
because the evaporation of water will result in a lower temperature
reading.
Excessive work space temperatures
Excessive work space temperatures after the calibration may be
reduced by leaving the doors open for approx. 30 seconds.