Technical Assistance - Omega FMA1700A User Manual

INDICATION
FMA1700A/1800A is
disconnected from the
source of the gas (no flow
conditions) but LCD Display
reading is fluctuating in
wide range. Output voltage
0-5 Vdc signal also
fluctuating. The power
supply voltage is 12.0 to
24.0 Vdc and stable.
Reading on the LCD Display
ten (hundreds) times less
or more than actual gas
flow. Output voltage
0-5 Vdc signal corresponds
correct gas flow.
For best results it is recommended that instruments are returned to the factory
for servicing. See section 1.3 for return procedures.
8.3

Technical Assistance

OMEGA7 Engineering will provide technical assistance over the phone to quali-
fied repair personnel. Please call our Flow Department at 800-872-9436 Ext.
2298.
LIKELY REASON
Sensor or PC board is
defective.
Decimal point jumper is
installed in wrong position
on the LCD Display Circuit.
22
REMEDY
Return FMA1700A/1800A to
factory for repair.
Carefully remove the LCD
from FMA1700A/1800A.
Remove the aluminum
housing on the side of the
connection cable. Side the
LCD assembly out of the
aluminum housing.
Reinstall jumper to the
appropriate location on the
8-pin header block
(see 7.4.3 on page 17).