Omega Products FMA-900-I Installation Manual

FMA-900 SERIES

Air Velocity Transducers

MADE IN

Standard

Remote Probe

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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

General Description

The OMEGA®FMA-900 air velocity mass flow transducer is ideal for economical
monitoring of clean air flows in ducts and pipes, while producing very little
permanent pressure drop in the flowstream The FMA-900 employs two rugged
glass-coated RTD elements, protected by a

1

⁄4" diameter 304SS tube with a
“window” cut out. One RTD is the velocity sensor, while the other RTD provides
ambient air temperature compensation. The velocity sensor is heated to maintain
a constant (approximately 30°C) temperature differential above the ambient air
temperature, as measured by the second RTD element. The cooling effect of the
air flow experienced by the velocity sensor is measured and converted to an
electrical output signal proportional to air velocity. The FMA-900 is provided
with a 13" long probe as standard. The 304SS tubing is provided with inch marks
for ease of insertion depth.

Unpacking

Remove the Packing List and verify that you have received all equipment. If you
have any questions about the shipment, please call the OMEGA Customer
Service Department.

Upon receipt of shipment, inspect the container and equipment for any sign of
damage. Note any evidence of rough handling in transit. Immediately report any
damage to the shipping agent.

The carrier will not honor any claims unless all shipping material is
saved for their examination. After examining and removing contents,
save packing material in the event reshipment is necessary.

The following items are supplied with the FMA-900:

• FMA-900 Series Air Velocity Transducer

• Mating connector

• Removable plastic protective cover (supplied on the sensor tip)

• Operator’s manual

15-18 Vdc

INPUT

0-5 Vdc or 4-20 mA
OUTPUT

DUCT, PIPE
HOOD,
ETC.

FLOW

10 TO 10,000

FPM

COMPRESSION

FITTING

AIR VELOCITY SENSOR

TEMPERATURE SENSOR

FMA-900 Series Air Velocity Transducers

NOTE

1-1