SADP_Operating_ Instructions_0114
12 Problem Guide
PROBLEM CAUSE SOLUTION
ERRATIC READINGS Static on Indicator Moisten indicator face with 50/50 mixture of
detergent & water, or use proprietary anti-static
cleaner. DO NOT POLISH INDICATOR FACE.
FULL SCALE READING Wet gas Stop gas supply & switch analyser off.
Short Circuit Sensor Disconnect plug from sensor & if the indicator
Cable or Plug still reads over full scale deflection. Cure the
short circuit in the cable or plug or replace.
Short Circuit Sensor Disconnect the plug from the sensor & note the
indicator falls to 0 deflection. Apply approx 24V
DC to sensor terminals MOMENTARILY with
the sensor in a dry condition. Polarity is not
important, but the contact must be brief or the
sensor may be damaged. If this fails to clear the
fault the sensor must be replaced.
ZERO READING Open Circuit on Cable Disconnect plug from sensor and connect centre
pin of plug to the outer connection. No reading
will be obtained. Repair cable.
Open Circuit on Sensor Test as for open circuit on cable, but note that
reading over FSD obtained. Check sensor
connection or replace sensor.
Autocal Wrongly Set. Readjust to correct setting (i.e. carry out the
Autocal procedure as on page 4).
Instrument Disconnect coaxial cable from instrument and
Unserviceable connect short circuit across terminals and note
no reading even with Autocal control turned up.
Return instrument for service.
WET READING Leak in System or Cure leak, or replace unsuitable pipe with
use of Unsuitable Pipe copper or stainless steel. Flexible connections
should be made with PTFE pipe. NEVER use
rubber or plastic pipe.
Comparison with Ensure that samples are taken from same sample
Secondary Standard point. Re-check Autocal setting. If problems still
Instrument or occurs change sensor.
Calibration Gas
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