Omega FMA 4000 - Manual (Page 40)

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