Omega Products FMA-900-I User Manual

GENERAL-PURPOSE
AIR VELOCITY TRANSDUCERS

F-113

⻬ Up to 1.5% Accuracy
⻬ Remote Probe Model Available

with 4.6 m (15') Cable

⻬ Each Unit Individually Calibrated
⻬ Durable Fast-Response

Platinum Sensors

⻬ Compact Solid-State Electronics
⻬ Directly Monitors True

Air Mass Velocity

⻬ Linear 0 to 5 Vdc or

4 to 20 mA Output

⻬ 400 msec Response Time
⻬ Economical

Insertion Design

The unique FMA-900 air velocity transducer utilizes
both a velocity sensor and a temperature sensor to
accurately measure air velocity (in SFPM, standard
feet per minute). The built-in temperature sensor
automatically corrects the flowrate for temperature
variations. Both sensors are rugged glass-coated
Platinum resistance detectors (RTDs). The circuit
heats the velocity sensor to a constant temperature
differential above ambient temperature and measures
the cooling effect of the air flow. This design provides
excellent low velocity sensitivity and high accuracy.
The FMA-900 also features negligible pressure drop.

To obtain mass flow rate in SCFM (standard cubic
feet/minute), the SFPM velocity indicated by the
FMA-900 is multiplied by the cross-sectional area
of the pipe or duct in square feet. A traverse across
the pipe or duct can be performed to determine the
mounting location for average velocity indication.
The FMA-900 can be mounted in pipes (down to
38 mm [1.5"] size) with the use of OMEGA®SSLK
compression fittings (SSLK-14-14, $8.50). PTFE
ferrules are required (T-FER-1/4, $40/10 pack).

Each unit is individually calibrated in OMEGA’s
NIST-traceable wind tunnel.

Suggested power supply; FPW-15, $75.

15 Vdc

INPUT

0 to 5 Vdc or 4 to 20 mA
OUTPUT

DUCT, PIPE
HOOD,
CLEAN BENCH,
ETC

FLOW

10 TO 10,000

SFPM

FLOW

RTD TEMP
SENSOR

RUGGED THERMAL
MASS VELOCITY
SENSOR

COMPRESSION

FITTING

Replacement mating connector, model FMA-3CON, $25.

For compatible meters and controllers,

see the iSeries, Section M.

FMA-900-V Series

$

822

All models

Optional

FMA-902-V, $822,

shown smaller

than actual size.

F

F-114

Model No. Price Description
CAL-3-FLOW $225.00 NIST-traceable 4-point calibration certificate
FPW-15 75.00 +15 Vdc power supply
FMA-3CON 25.00 Replacement mating connector
SSLK-14-14 8.50 Compression fitting
T-FER-1/4 40.00 PTFE ferrules (10-pack)
FW-0119 155.00 Reference Book: Flow Measurement

To Order

(Specify Model Number)

Model No. Model No.
0 to 5 V Output Price 4 to 20 mA Output Price Range

FMA-900-V $822 FMA-900-I $882 0 to 100 SFPM
FMA-901-V 822 FMA-901-I 882 0 to 200 SFPM
FMA-902-V 822 FMA-902-I 882 0 to 500 SFPM
FMA-903-V 822 FMA-903-I 882 0 to 1000 SFPM
FMA-904-V 822 FMA-904-I 882 0 to 2000 SFPM
FMA-905-V 822 FMA-905-I 882 0 to 5000 SFPM
FMA-906-V 822 FMA-906-I 882 0 to 10,000 SFPM

Comes with 4-point certificate of compliance, mating connector pre-wired to 4.6 m (15') shielded cable and complete operator’s manual.
To order with 95 mm (3.75") probe instead of standard 330 mm (13") probe, add suffix “-S” to model number and add $30 to price.
To order models with remote probe add suffix “-R” to model number and $30 to price.
Ordering Example: FMA-904-I, probe with 4 to 20 mA output, 0 to 2000 SFPM range, plus CAL-3-FLOW, NIST 4-point calibration certificate,

$882 + 225 = $1107.

SPECIFICATIONS

Accuracy: 1.5% FS @ room temperature

2% at 50°C; 3% at 75°C; 3

1

⁄2% at 100°C;

4% at 121°C; add 1% FS below 1000 SFPM

Repeatability: ±0.2% FS
Initial Stabilization Time in Flow: 40 sec
Response Time/After Stabilization:

400 msec to within 63% of final value
at room temperature

Probe: Aluminum oxide ceramic glass
coating, epoxy; probe body 304SS

Probe Temperature:

-40 to 121°C (-40 to 250°F)

Probe Pressure: 150 psig maximum
Electronics Temperature:

Operating: 0 to 50°C (32 to 122°F)
Storage: 0 to 70°C (32 to 158°F)

Operating Relative Humidity: Less

than 80% RH, without condensation
Ambient Temp Compensation: About

5 min for 11°C (20°F) temp change

Outputs: 0 to 5 Vdc or 4 to 20 mA
Voltage Load Resistance:

250 Ω minimum

Current Loop Resistance:

0 Ω minute to 400 Ω maximum; 4-wire

Power: 15 to 24 Vdc, 300 mA
(0 to 100 and 0 to 200 SFPM only);
15 to 18 Vdc, 300 mA (all other ranges)

Accessories: Mating connector pre­wired to 4.6 m (15') shielded cable (with
built-in ferrite core) included, standard

Dimensions:

Case: 89 H x 51 W x 31.8 mm D

(3.5 H x 2 W x 1.25" D)
Probe: 6.35 mm (0.25") O.D.,

330 mm (13") length
Short Probe (-S): 6.35 mm (0.25") O.D.,
95 mm (3.75") length

Weight: 160 g (5.6 oz)

ALL MODELS AVAILABLE FOR FAST DELIVERY!

Accessories

Models with remote probe
add suffix “-R” and $30.

FMA-902-V-R,

$852,shown smaller

than actual size.