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FMA900A-Series
Hot Wire Air Velocity Transmitter with Alarm Contact
Models In Stock
- Air Velocity Range Up to 10,000 FPM (50.8 m/sec)
- ± 15 FPM Full Scale Accuracy
- Hot Wire Air Velocity Sensor Design
- Two Sensor Probe Configurations: Fixed Mount and Remote Probe
FMA900A-Series
From
C$
922.87
Models In Stock
Product Overview
- Accuracy ± 2 %
- Accuracy Detail 2% of FS or 15 FPM whichever larger
- Air Velocity, Min 0 m/h
- Alarm Deadband 5% of FS
- Alarm Indication Red LED
- Alarm Indication Note Red LED on the back plate
- Cable Length 15 ft
- Contact Rating 10A @ 24 Vdc
- Enclosure Temperature, Max 50 °C
- Enclosure Temperature, Min 0 °C
- Form factor Field Mount
- Height 3.5 in
- High Alarm Set Point Adjustable from 0 to 100% of air flow range
- Length 2 in
- Materials Stainless Steel
- Number of Sensors 2
- Operating Temperature, Max 93 °C
- Operating Temperature, Min -40 °C
- Probe Diameter 0.25 in
- Response Time 250 ms
- Series ID FMA900A-Series
- Supply Current 200 mA
- Supply Power Note 15 to 24 Vdc @ 200 mA
- Supply Voltage 15 to 24 Vdc
- Switch Note Relay: One 12V SPST NO relay
- Switch Type SPST
- Temperature Accuracy ± 0.5%
- Temperature Sensor Type RTD
- Weight 160 g
- Width 1.25 in
Supported Applications
The Omega FMA900A Series is an industrial air velocity transmitter designed for measuring airflow in HVAC monitoring, exhaust and ventilation hoods, research and development laboratories, and manufacturing processes. The device utilizes a hot wire sensor design based on RTD elements to measure air velocity by detecting heat loss from the sensor as it cools in the moving medium.
Media compatibility is restricted to clean air or nitrogen only; use with other gases will produce measurement errors. Air carrying dust or oil can lead to coating of the sensor and inaccurate readings. The unit is not explosion-proof nor intrinsically safe, and must not be used for flammable or hazardous gases or in Hazardous areas.
Operating Conditions & Performance
The FMA900A Series operates within an ambient temperature range of 0 to 50°C (32 to 122°F) and a process temperature range of -40 to 93°C (-40 to 199°F). Accuracy is specified as 2% of FS or 15 FPM, whichever is larger. The response time for the sensor is 250 msec.
Measurement ranges are available from 0 to 200 FPM (0 to 1.02 m/sec) up to 0 to 10,000 FPM (0 to 50.8 m/sec). The manual also documents a range of 0 to 12,000 FPM (0 to 60.9 m/sec) for specific model configurations. As a bi-directional device, the transmitter provides identical readings whether airflow is in the forward or reverse direction and can be mounted vertically or horizontally without calibration shift.
Key Performance Specifications
- Accuracy: 2% of FS or 15 FPM, whichever larger
- Response Time: 250 msec
- Ambient Temperature: 0 to 50°C (32 to 122°F)
- Process Temperature: -40 to 93°C (-40 to 199°F)
- Power Supply: 15 to 24 Vdc @ 200 mA
- NIST Traceability: Optional up to 8,500 FPM (CAL-3-FLOW certificate available)
Configuration Options
The series offers configurable analog outputs and probe configurations tailored for specific installation needs. Output signals are selectable as either 0 to 5 Vdc or 4 to 20 mA, indicated by the suffixes "-V1" or "-MA" respectively in model numbers.
Probe Configurations
The sensor is housed in a stainless steel tube with inch marks for insertion depth reference. Three probe styles are available:
- Fixed Probe (Suffix A): Integrated unit where the transmitter and sensor are fixed together.
- Remote Probe (Suffix R): Features a 12" long remote probe with 15 feet of shielded cable, allowing separation between the sensing element and the electronics housing.
- Short Probe (Suffix S): A compact option featuring a 95 mm (3.75") short probe for applications requiring reduced insertion length.
Housing & Connections
The transmitter enclosure measures 89 H x 51 W x 32 mm D (3.5 x 2 x 1.25"). Electrical connections are made via a terminal block. The probe sheath is constructed of stainless steel with a diameter of 6 OD (¼" OD) and an insertion length of 305 mm (12") for standard probes.
Alarm Functionality
All models include one SPST relay contact closure for high alarm operation. The High Alarm Set Point is adjustable from 0 to 100% of the air flow range. Visual status indicators include a green power LED and a red LED for alarm indication.
Key Product Differences
Variants within the FMA900A Series are distinguished by measurement range, probe type (fixed vs. remote), output signal format, and physical length of the sensing element.
- Range Selection: Models correspond to specific velocity ranges: 200, 500, 1,000, 2,000, 5,000, or 10,000 FPM. The manual also lists a 12,000 FPM range for the FMA906 series.
- Output Suffixes: "-V1" denotes 0 to 5 Vdc output; "-MA" denotes 4 to 20 mA output. No additional cost is applied for selecting either output type.
- Probe Length Option: Adding the suffix "-S" configures the unit with a 95 mm (3.75") short probe instead of the standard length, at no additional cost.
Accessories available for this series include NIST traceable calibration certificates (CAL-3-FLOW), shielded cable spools (TX8-100), regulated power supplies (PSR-24S/PSR-24L), and compression fittings with PTFE ferrules (SSLK-14-14, T-FER-1/4).
PDFs & Manuals
Show Ratings & Reviews
Rated 3 out of
5
by
SUN MIT from
It is broken
I bought it less month ago. But now it is broken. So I bought another one today. I will send the old one to the company and let them repair it for me.
Date published: 2016-09-30
Rated 2 out of
5
by
hartkj from
FMA902R-V1
Instructions vague & not detailed, no recommendation for display --digital or analogue
Date published: 2019-02-25
Do these come calibrated with the calibration values
Thank you for your inquiry. The FMA900A series meter are calibrated but do not come with a calibration certificate. If you need a calibration certificate with the meter, send an e-mail to flow@omega.com and we can provide a quote for the meter with a calibration certificate.
Date published: 2019-10-09