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Omega FMA 4000 User Manual Page 40

Digital mass flow meters.
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NO.
INDICATION
8
Gas flows through the
FMA 4000, but LCD
Display reading and the
output voltage 0-5 Vdc
signal do not respond
to flow.
9
Gas does not flow
through the FMA 4000
with inlet pressure
applied to the inlet
fitting. LCD Display
reading and output
voltage 0-5 Vdc signal
show zero flow.
10 Gas flows through the
FMA 4000, output
voltage 0-5 Vdc signal
does not respond to
flow (reading near
1mV).
11 The Status LED
indicator is rapidly
flashing with UMBER
color on /off.
12 The Status LED
indicator is rapidly
flashing with RED color
on /off.
13 The Status LED
indicator is rapidly
flashing with RED and
UMBER colors.
14 The Status LED
indicator is constantly
on with the RED light.
LIKELY REASON
The gas flow is too low
for particular model of
FMA 4000.
FMA 4000 models:
RFE is not connected
properly to the inlet
fitting.
Sensor or PC board is
defective.
Filter screen obstructed
at inlet.
Direction of the gas
flow is reversed.
FMA 4000 is connected
in the installation with
back pressure
conditions and gas leak
exist in the system.
Sensor temperature is
too low.
Sensor temperature is
too high.
MCU temperature is too
high (overload).
Fatal Error (EEPROM
or Auto Zero error).
36
SOLUTION
Check maximum flow range on transducer's
front panel and make required flow
adjustment.
Unscrew the inlet compression fitting of the
meter and reinstall RFE (see section 6.2.2).
NOTE: Calibration accuracy can be affected.
Return FMA 4000 to factory for repair.
Flush clean or disassemble to remove
impediments or replace the filter screen
(see section 6.2).
NOTE: Calibration accuracy can be affected.
Check the direction of gas flow as indicated
by the arrow on the front of the meter and
make required reconnection in the
installation.
Locate and correct gas leak in the system.
If FMA 4000 has internal leak return it to
factory for repair.
Make sure the ambient and gas
temperatures are within specified range
F
(above 5
C)
Make sure the ambient and gas
temperatures are within specified range
F
(below 50
C).
Disconnect power from the FMA 4000.
Make sure the ambient temperature is with
in specified range (below 50
device cool down for at least 15 minutes.
Apply power to the FMA 4000 and check
status LED indication. If overload condition
will be indicated again the unit has to be
returned to the factory for repair.
Cycle the power on the FMA 4000. If Status
LED still constantly on with RED light, wait
6 minutes and start Auto Zero function (see
5.3.7 Zero Calibration). If after Zero
Calibration the Fatal Error condition will be
indicated again the unit has to be returned
to the factory for repair.
F
C). Let the

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