Preparing Temperature Calibration; Comparison Measurement Procedure - Thermo Scientific Heratherm IMH 60 Operating Instructions Manual

Preparing Temperature Calibration

To determine the exact measured value of the 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 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 incubator on using the power switch.
2. Set the temperature set value and allow the 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
page
Thermo Scientific
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 after the calibration may be
reduced by leaving the doors open for approx. 30 seconds.
"Entering the Calibration Reference Temperature Manually"
7-23.
Preparing Temperature Calibration
Isothermal container
Excessive work space temperatures
Maintenance
on
Heratherm 10-3