50 Technical Manual | Dräger Polytron
®
8000 Series
Calibration
WARNING
Calibration fault at zero calibration
Insufficient ambient air flow may cause calibration errors.
Make sure that the ambient air flow to the sensor is sufficient.
Polytron
®
8100 EC-specific:
For Oxygen (O
2) sensors a zero calibration does not change any value in the
firmware or sensor. Thus, the zero calibration function can be used to check the
correct zero reading when Nitrogen is applied to the sensor. The Polytron
®
8100
EC will indicate a fault state if a zero check fails with a deviation of more than 0.6
Vol% O
2 from zero. In case of a fault, repeat the zero check or change the sensor if
necessary. Use Nitrogen (N
2) for verification.
Polytron
®
8200 CAT-specific:
Sensors must not be calibrated with pure nitrogen. Catalytic sensors need oxygen
to work properly.
Polytron
®
8720 IR-specific:
For Polytron
®
8720 IR (with PIR 7200 to detect carbon dioxide), only Nitrogen or
Synthetic Air without any CO
2 content may be used for a zero calibration.
9.5.1 Performing zero calibration
Calibration can be aborted at any time. To abort calibration select back.
Prerequisites:
– Sensor has finished the warm-up phase
– Calibration is prepared.
Perform zero calibration
1. Select Calibration > Zero calibration and confirm.
The Maintenance signal is transmitted by the analog interface, no alarm or
fault relays are switched and the symbol is displayed.
The message Apply zero gas is displayed.
2. Apply synthetic air or nitrogen, if ambient air cannot be used.
a. Set gas flow corresponding to the sensor used (see "Gas flow for
calibrations", page 49)
3. Select Next and confirm.
The current value is displayed.
After 15 minutes without confirmation, the instrument reverts to the calibration
menu without performing a calibration.
After the test gas has been applied to the sensor for 3 minutes and the displayed
value is stable perform calibration.
4. Select calibrate and confirm.
The message please wait... is displayed.
The new current value is displayed.
5. Select Next and confirm.
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