GMI Shipsurveyor - Zero Fault Conditions; Zero Fault Display and Correction

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USER HANDBOOK
4.5.3 ZERO FAULT
If a zero fault occurs in CSM mode, the instrument’s audible
alarm will activate. The visual alarm (yellow and four red
LED’s) will also activate.
If a zero fault occurs in CGI mode, only the visual alarm
(yellow LED) will activate.
In both modes, a spanner symbol ashes in the display
adjacent to the corresponding gas type (H2S), as illustrated
in Shipsurveyor 3 example, Fig. 4-9.
alternates with
Fig. 4-9 Zero Fault
To correct the zero fault, switch the instrument OFF then ON
again in fresh air. If this does not correct the fault, return the
instrument for service.