F
AILURES
6.1.2 Failure messages
Failure messages are indicating (with acoustic alarm and blinking
failure-indicating lamp) that a direct return to normal operation of the
instrument is not possible. The instrument must be switched off. After
successful elimination of cause for failure or breakdown instrument
may be switched on again for normal start-up procedure.
WARNING! HIGH VOLTAGE!
Prior to opening up of instrument for any reason, its main power
supply cable must be unplugged!
"Zero setting unstable”
Explanation:
Sensor unable to conform preset value within determined tolerances
during zero setting.
Probable causes:
- Zero-gas filter spent
- Measurement chamber leakage at inlet/outlet gate valve be-
cause of insufficient dust filtration or excessive suction (higher
than 50 mbar = 0.7 psi)
- Excessive suction may also be caused by hose lengths exceed-
ing permissible length.
Corrective action:
Replace zero-gas filter (activated-carbon filter on instrument
front panel). If problem re-occurs, exchange of measuring cell is
required (manufacturer).
Incorrect installation of filter and undue extension of
maintenance intervals will cause malfunctions or damages of
measuring instrument.
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