Aalborg DFC Digital - Manual (Page 22)

19
Indication
full scale
output at
"no flow"
condition or
with valve
closed
calibration off
DFC valve
does not work
in open
position
DFC valve
does not
work in close
position
Remedy
return to factory for replacement
locate and repair
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 disassemble to remove
impediments 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)
re-adjust valve (section 6.2.4)
return to factory for replacement
check cable and connectors or replace
decrease pressure to correct level
adjust appropriately
re-adjust valve (section 6.2.4)
return to factory for replacement
check cable and connectors or replace
disassemble to remove impediments
or return to factory
Likely Reason
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
incorrect valve adjustment
pc board defect
cable or connectors
malfunction
differential pressure too high
insufficient inlet pressure
incorrect valve adjustment
pc board defect
cable or connectors
malfunction
orifice obstructed