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Air Duct Flow Meter: HVAC Ventilation Airflow Balancing Anemometers
Quick Answer
An air duct flow meter for HVAC ventilation airflow balancing measures air velocity, volumetric flow, or mass flow inside ductwork. Silver Automation Instruments recommends insertion thermal mass flow meters and differential pressure transmitters for this measurement. Send duct width, duct height, velocity range, air temperature, signal output, and power supply. We will return a specific model, accuracy data, and price.
Why HVAC Airflow Balancing Needs a Duct Flow Meter
Most large buildings run variable air volume systems. Engineers must set supply air and return air for each air handling unit. A fixed duct flow meter gives a live reading in Nm/s or m3/h. That beats a handheld vane anemometer because the probe stays in the duct. BAS and DDC systems can log the signal 24 hours a day.
Here is the thing. A small damper change can shift air velocity by 15 percent. Without a permanent meter the technician works blind. With an insertion thermal probe the balancing crew sees the result in real time. We have seen this on customer sites in Malaysia, Vietnam, and the Philippines.
Fixed Duct Anemometer or Insertion Thermal Probe
An HVAC air velocity sensor is often called a duct anemometer. For permanent balancing and monitoring a fixed insertion probe works better than a handheld hot wire unit. The probe installs through a 12 mm or 20 mm ball valve on round or rectangular ducts. Most probes cover 0.5 to 60 Nm/s. Output options include 4-20 mA HART and RS485 Modbus RTU.
Thermal mass probes from Silver Instruments include a PT100 temperature sensor. That gives built-in temperature compensation. The insertion probe fits DN80 to DN2000 ducts. For large ducts you can choose a probe length of 350 mm, 500 mm, or 800 mm. Accuracy is typically plus or minus 1.5 percent of reading plus 0.3 percent of full scale.
Differential pressure is another option. An averaging pitot tube with a DP transmitter measures dynamic pressure. This method works when the duct is large and the air is clean. Our standard DP transmitter reaches 0.075 percent of calibrated span. The 4-20 mA signal connects directly to a DDC panel.
Selection Data That Gets a Fast Quote
Send us these details. Duct width and height or round duct DN. Air velocity range in Nm/s or flow range in m3/h. Air temperature in degrees C. Static pressure in bar or kPa. Output signal 4-20 mA HART or Modbus RTU. Power supply 24 VDC or 220 VAC. If th
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Buyers who skip this step get long email threads. Engineers who send full data get a model and price in one working day. For urgent balancing jobs call Tel +86-25-68650347 or WhatsApp +86-25-52155837. WeChat is +86 15365082610.
Field Example: Snack Food Factory in Malaysia
Last year a customer in Malaysia balanced air handling units in a snack food plant. Duct size was 800 by 600 mm. Air temperature stayed near 22 degrees C. Velocity ranged from 4 to 11 Nm/s. The customer needed a 4-20 mA signal to the DDC controller.
Our insertion thermal mass flow meter with a 350 mm probe fit the job. The customer installed it through a 25 mm ball valve. Airflow data went straight to the BAS. Balancing took one afternoon instead of two days. The meter still runs today without drift.
FAQ
Can a thermal mass flow meter measure round and rectangular HVAC ducts?
Yes. Insertion probes work in both shapes. The key input is the internal duct cross sectional area. The transmitter calculates volumetric flow in m3/h or Nm3/h.
What output signal works with BAS and DDC panels?
Use 4-20 mA HART or Modbus RTU. Most building systems accept 4-20 mA without extra converters. Modbus works well for larger networks with many probes.
What accuracy should an HVAC airflow meter deliver?
Expect plus or minus 1.5 percent of reading plus 0.3 percent of full scale for a thermal mass probe. A differential pressure transmitter can reach 0.075 percent of calibrated span. Choose thermal mass for low velocity and direct mass flow. Choose DP for high static pressure or high temperature ducts.
Do you supply ATEX rated air duct flow meters?
Yes. We can supply probes for ATEX Zone 1 and Zone 2 gas areas. The transmitter housing and probe are available with Ex d or Ex ia protection. State the zone and gas group in your enquiry.
How do I request a price for an air duct flow meter?
Send duct dimensions, velocity range, temperature, output signal, and power supply. Email or WhatsApp us. Probe length and flow range differ for every HVAC balancing job. We need these details to quote correctly.
Get a Specific Quote
Send your duct dimensions, velocity range, air temperature, output signal, and power supply to Silver Automation Instruments. We will provide a specific air duct flow meter model, calibration sheet, lead time, and price. Reach us by Tel +86-25-68650347, WhatsApp +86-25-52155837, or WeChat +86 15365082610.