Dwyer GFM - Manual (Page 20)

16
INDICATION
lack of reading or output
unstable or no zero reading
full scale output at “no flow”
condition or with valve
closed
calibration off
LIKELY REASON
power supply off
fuse blown
filter screen
obstructed at inlet
occluded sensor tube
pc board defect
power supply problem
gas leak
pc board defective
defective sensor
gas leak
gas metered is not the
same as what meter was
calibrated for
composition of gas
changed
gas leak
pc board defective
RFE dirty
occluded sensor tube
filter screen obstructed at
inlet
transducer
is not mounted properly
REMEDY
check connection of power
supply
disconnect GFM transducer
from power supply; remove
the shorting condition or
check polarities;
fuse resets automatically
flush clean or disassemble
to remove impediments or
replace
flush clean or or return to
factory for replacement
return to factory for replacement
check power supply for
appropriate output
locate and correct
return to factory for replacement
return to factory for replacement
locate and correct
use matched calibration
see K factor tables in
APPENDIX 2
locate and correct
return to factory for replacement
flush clean or disassemble
to remove impediments
flush clean or return to
factory for replacement
flush clean or disassemble to
remove impediments or replace
check for any tilt or change
in the mounting of the
transducer; generally, units
are calibrated for horizontal
installation
(relative to the sensor tube)
8.2 Troubleshooting Guide