Dwyer GFC - Manual (Page 27)

23
INDICATION LIKELY REASON REMEDY
lack of reading power supply off check connection of power supply
or output
fuse blown disconnect transducer from
power supply; remove the
shorting condition or check
polarities; fuse resets
automatically
filter screen flush clean or disassemble to
obstructed at inlet remove impediments or replace
occluded sensor tube flush clean or disassemble to
remove impediments or return to
factory for replacement
pc board defect return to factory for replacement
valve adjustment wrong re-adjust valve (section 7.3)
flow reading inadequate gas pressure apply appropriate gas pressure
does not
coincide with
filter screen obstructed flush clean or disassemble to
the setpoint at inlet remove impediments or replace
ground loop signal and power supply
commons are different
no response inadequate gas pressure apply appropriate gas pressure
to setpoint
cable or connector malfunction check cables and all connections
or replace
setpoint is too low re adjust setpoint or disable 2%
(<2% of full scale) cutoff feature (section 2.2)
valve adjustment wrong re-adjust valve (section 7.3)
unstable or gas leak locate and correct
no zero reading
pc board defective return to factory for replacement
full scale output defective sensor return to factory for replacement
at "no flow"
condition or
with valve
gas leak locate and repair
closed
8.2 Troubleshooting Guide