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Air Flow Meter for Ducting: HVAC Ventilation CFM Anemometers
Quick Answer: For permanent HVAC air monitoring, a fixed duct air flow meter replaces handheld anemometers and provides continuous CFM data. Silver Instruments supplies insertion thermal mass flow meters that output 4-20 mA HART directly to your BMS or PLC. These meters handle air temperatures from -20 °C to 150 °C and duct sizes from DN50 to DN300.
Fixed Duct Air Flow Meter vs. Handheld Anemometer
Handheld CFM anemometers work fine for spot checks. But when a building engineer needs 24/7 data on ventilation fans, a permanent meter is the only way. An insertion thermal mass flow meter sits inside the duct and measures the total mass flow. No need to open access panels or climb ladders every week. This is common in Singapore office towers where fresh air intake must comply with SS 553 codes. A fixed meter also eliminates human error during manual traverse measurements.
How a Thermal Mass Flow Meter Reads Air Flow in Ducts
The probe has two sensors. One measures the gas temperature, the other is heated. The cooling effect of air passing over the heated sensor relates directly to mass flow. This method does not need pressure or temperature compensation. You get a standard volumetric flow like Nm³/h or CFM directly. Silver Instruments uses PT100 references and constant temperature difference technology. The output is linear and stable even with dusty air, which we have seen in a paint booth exhaust duct in Thailand.
Key Specifications for HVAC Duct Air Flow Meters
Engineers often ask for these parameters: duct size DN100, air velocity 0.5 to 40 m/s, accuracy ±1.5% of reading, and a 4-20 mA HART signal. Our insertion probes come with a 1/2 inch NPT or a flange mount. The electronics support RS485 Modbus RTU if you need digital integration. The display shows CFM, m³/h, or kg/h. The power supply is 24 V DC. The probe length is adjustable up to 600 mm. For a DN200 duct in a Jakarta hospital ventilation system, we recommended a probe insertion depth of 120 mm.
Installation Tips and Best Practices
Place the probe at a straight duct section. The rule is 15 diameters upstream and 10 downstream from any bend or damper. In practice, many HVAC ducts have limited space. We suggest a minimum of 10D upstream. If you have an elbow close to the mounting point, contact us with a sketch. We can help estimate the flow profile error. The insertion hole requires a ball valve assembly for hot-tap installatio
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Real-World Applications Across Industries
In Malaysia, a semiconductor plant uses our air flow meters on cleanroom makeup air ducts to maintain positive pressure. The output goes into a Siemens BMS. In a Dubai shopping mall, the facility team monitors parking garage exhaust CFM to control CO levels. They use 10 units with RS485 networking. One interesting case: a brewery in South Africa installed our flow meter on a dryer exhaust to track energy use. The data helped them optimize the burner. All these applications replaced handheld anemometer checks with automatic logging.
FAQ
Can I use this air flow meter for high-humidity or wet air ducts?
Yes, the sensor head is sealed to IP68 and the probe material is 316L stainless steel. We have meters in outdoor air intake ducts in coastal Australia with no drift after three years.
What is the difference between CFM and m³/h on the display?
The meter can display both. You set the unit via the keypad or HART communicator. 1 CFM equals approximately 1.7 m³/h. Our default for HVAC is m³/h, but we ship many units set to CFM for the North American market or Middle East projects using US specifications.
Do you supply a complete kit with probe, transmitter, and cable?
Yes. A typical order includes the insertion probe, a wall-mount transmitter with display, 5 meters of shielded cable, and a mounting flange or compression fitting. Specify your duct diameter and wall thickness.
How do I get a price quote?
Send us your duct size (DN or inches), air temperature, flow range in CFM or m³/h, and which signal you need: 4-20 mA HART or RS485 Modbus. Email [email protected] or call +86-135-1213-1526. Our WhatsApp is 86-135-12131526. WeChat: +86 13512131526. A typical quote comes back within 12 hours.
Can Silver Instruments provide an ATEX Zone 2 version for paint booth exhaust?
We offer an ATEX Zone 2 approved model with II 3G Ex nA IIC T4 protection. The probe length and mounting remain the same. You must specify the hazardous area classification when ordering. We have shipped these to a chemical plant in Thailand and a solvent recovery system in Turkey.
For a quick quote, email [email protected] with your duct dimensions and flow range.
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