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8.3
FMA 5400A/5500A Series Max. Flow 10, 50
and 100 L/min Valve Related Troubleshooting
8.3.1 INDICATION:
LIKELY REASON: REMEDY:
With “no flow
conditions” (gas pipes
are not connected to the
FMA 5400A/5500A) and
valve closed (pins 3 and
12 are connected
together) LCD reading
is zero, but when 20
PSIG inlet pressure is
applied the LCD reads
more than 0.5% of full
scale.
Valve is out of
adjustment and
leaking.
1. Adjust control set point to zero. Set
Valve mode to “CLOSE” position
(connect pins 3 and 12 on the 15 pins
D-connector together).
This step is very
important!
2. Apply 20 PSIG inlet pressure.
3. See operating manual page 17 (Figure
6-1). Unscrew hex nut cover on the top
of the solenoid valve.
4. Using a screwdriver readjust adjustment
screw on the top of the valve to CW
(clock wise) direction until zero reading
on the display.
Be very careful during
adjustment:
make only 15 degree turn
each time and wait one minute due
to the sensor’s response time. If reading
is still high make another 15 degree turn.
Do not over adjust valve. If you made
more than 5 complete (360 degree)
turns and leakage still exists stop
adjustment. In this case unit has to be
returned to the factory for servicing.
5. This is not a shut off valve. It is normal
to observe up to 0.5 % of F.S. leakage.
6. Adjust hex nut cover on the top of the
solenoid valve.
7. Disable Valve “Close” mode,
apply 100% control set point and check
if reading can reach 100% reading.
INDICATION
LIKELY REASON
REMEDY
FMA
5400A/5500A
valve not
not work in
closed position
FMA 5400A/5500A Series Max
Flow 10, 50, 100 L/min
incorrect valve adjustment
re-adjust valve (section 8.3.1)
pc board defect
return to factory for replacement
cable or connectors
check cable and connectors
or replace
orifice obstructed
disassemble to remove
impediments or return to factory
