31
INDICATION
LIKELY REASON
REMEDY
full scale output
at “no flow”
condition or
with valve
closed
defective sensor
return to factory for replacement
gas leak
locate and repair
FMA 5400A/5500A Series Max
valve Flow 10, 50, 100 L/min
adjustment wrong
re-adjust valve (section
8.3.1 below)
calibration off
gas metered is not the same as
what meter was calibrated for
use matched calibration
composition of gas changed
see K factor tables in APPENDIX 2
gas leak
locate and correct
pc board defective
return to factory for replacement
RFE dirty
flush clean or disassemble to
remove impediments
occluded sensor tube
flush clean or disassemble to
remove impediments or return to
factory for replacement
filter screen obstructed
at inlet
flush clean or disassemble to
remove impediments or replace
transducer is not
mounted properly
check for any tilt or change in the
mounting of the transducer;
generally, units are calibrated for
horizontal installation (relative to
the sensor tube)
FMA
5400A/5500A
valve does
not work
in open position
FMA 5400A/5500A Series Max
Flow 10, 50, 100 L/min
incorrect valve adjustment
re-adjust valve (section 8.3.3)
pc board defect
return to factory for replacement
cable or connectors
malfunction
check cable and connectors
or replace
differential pressure too high
decrease pressure to correct level
insufficient inlet pressure
adjust appropriately
