VWR CO2 Incubator Basic, User Manual

Page: 67 / 86

VWR CO2 Incubator Basic | 65
Maintenance |
Chapter 10
5. Cancel the calibration process:
Press any key.
The temperature display and the CO
2
display show the actual values.
Preparing the CO
2
calibration
To determine the exact measured value of the device integral CO
2
sensor, a CO
2
comparison
measurement may be performed every three months.
If a major deviation is found during this check, a CO
2
calibration is required. During this process,
the CO
2
control of the device is set to the value measured during the comparison measurement.
Use a calibrated measuring instrument with an accuracy of ± 0.3% CO
2
for this test.
Suitable instrument:

Portable IR readout instrument. (Part no. see Chapter 11 “Parts and accessories”).
The measuring sample is withdrawn through the seal-able measurement opening of the glass door
or through the access port at the rear panel of the device. The comparison measurement must be
performed when the device is completely stable.