Performing Zero Calibration - Dräger Polytron 8000 Series Technical Manual

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
For Oxygen (O
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
EC will indicate a fault state if a zero check fails with a deviation of more than 0.6
Vol% O
necessary. Use Nitrogen (N
Polytron
Sensors must not be calibrated with pure nitrogen. Catalytic sensors need oxygen
to work properly.
Polytron
For Polytron
Synthetic Air without any CO
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
 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
3. Select Next and confirm.
 The current value is displayed.
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.
50
®
8100 EC-specific:
) sensors a zero calibration does not change any value in the
2
from zero. In case of a fault, repeat the zero check or change the sensor if
2
) for verification.
2
®
8200 CAT-specific:
®
8720 IR-specific:
®
8720 IR (with PIR 7200 to detect carbon dioxide), only Nitrogen or
2
fault relays are switched and the symbol
calibrations", page 49)
After 15 minutes without confirmation, the instrument reverts to the calibration
content may be used for a zero calibration.
is displayed.
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Technical Manual
Dräger Polytron
®
8100
®
8000 Series