56 Technical Manual | Dräger Polytron
®
8000 Series
Troubleshooting
171 Zero drift too high. Perform zero calibration
172 PIR 7x00 optics dirty. Clean PIR 7x00 optics.
173 Zero calibration expired for
span calibration
Perform zero calibration
182 Auto calibration not possi-
ble with PIR 7200.
Perform new zero and span calibra-
tion
Warning
number
Cause Remedy