Thermo Scientific Heracell Vios 160i CR, Operating Instructions Manual

Page: 159 / 216

9
Maintenance
Preparing the CO2 Calibration
Thermo Scientific
Heracell Vios 160i / 250i CR
9-5
• The system returns to the main menu. The temperature displays shows the actual value currently
measured in the workspace.
Value reset:
If the value isn’t changed within the next 30 seconds, the system automatically exits the menu, and the
most recently confirmed value is preserved.
Preparing the CO
2
Calibration
To determine the exact measured value of the device-integral CO
2
sensor, a CO
2
comparison
measurement has to 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.

The measuring sample is withdrawn through the measurement port [1/ Figure 9-4 ] of the glass
door. The comparison measurement must be performed when the device is completely heated to
the set temperature.

Figure 9-4. Gas-Tight Screen Measurement Port
Note
Excessive workspace temperature:

Excessive workspace temperatures after the calibration can be reduced by leaving the doors open for
approx. 30 seconds.
1