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Flow Meter Air: Industrial Gas and Ventilation Airflow Tools
Quick Answer
Air and gas flow meters from Silver Automation Instruments give you direct mass flow or volumetric readings for compressed air, natural gas, biogas, nitrogen, CO₂, and ventilation air. Typical accuracy is ±1% of reading for thermal mass models and ±0.75% for vortex meters. Most models include 4‑20 mA HART, pulse output, and optional RS485 Modbus. You can use them in ATEX Zone 1 areas, on DN15 to DN300 pipes, from -40 °C up to 350 °C.
Which Air Flow Meter Technology Should You Pick
The right choice depends on one thing first: wet or dry gas. In compressed air lines after the dryer, thermal mass flow meters work very well. They measure mass flow directly in kg/h or Nm³/h. No extra pressure or temperature compensation is needed. Insertion‑style thermal meters go into pipes from DN40 to DN300. For smaller pipes, inline thermal meters cover DN15 to DN50.
Here is the thing. Most engineers skip checking the gas composition first. A thermal meter calibrated for air will not read correctly on biogas or hydrogen‑rich streams. Always send us the full gas mix when you ask for a quote.
If your gas is wet, dirty, or you have large pipe diameters above DN100, we often recommend a vortex flow meter with integrated temperature and pressure compensation. It gives you compensated volumetric or mass flow. Vortex meters handle steam, vent gas, and even flare gas. The bluff body can be 316L stainless steel or Hastelloy C for corrosive gases.
Ventilation Airflow Measurement in Ducts and Tunnels
In ventilation ducts, the challenge is low velocity. Many air flow sensors lose accuracy below 2 m/s. Silver Instruments thermal mass probes with a velocity range down to 0.3 m/s solve this. We have used them on mining ventilation shafts in Australia and paint shop exhaust ducts in Vietnam. You get a stable signal even at 0.5 m/s.
Insertion probes go into rectangular or round ducts. For tunnels, we supply IP67‑rated transmitters and optional remote displays. The output can go directly into a BMS or SCADA system via 4‑20 mA. Typical ranges: 0…5 m/s, 0…10 m/s, 0…20 m/s. The probe length can be up to 900 mm.
In practice, we see many customers order an averaging Pitot tube for clean air in large ducts. It gives a differential pressure signal. We then combine it with a multivariable transmitter. The result is a low‑cost, reliable airflow station. One customer in Kenya ordered 16 such stations for a drying kiln ventilation upgrade. The total cost was about 60 % less than individual thermal probes.
Compressed Air: Why Mass Flow Meters Save Money
Compressed air is expensive. Leakage or no‑load consumption can be 20 % to 40 % of total usage. A thermal mass flow meter installed on the main header gives you real‑time mass flow in kg/h. You can track consumption per shift, per production line. We recommend models with a built‑in totalizer and Modbus RTU. The data goes to an energy management system or paperless recorder.
Because the meter measures mass flow, it is immune to pressure and temperature swings. A 1 bar pressure drop changes the density, but the mass flow reading stays correct. For compressed air audits, we rent out portable insertion flow meters with data logging. Send us your pipe diameter and schedule a test.
Common sizes: DN25 for branch lines, DN50 to DN100 for ring mains, DN150 for headers. Wetted parts can be 304 or 316L stainless steel. Proces
Biogas and Digester Gas Applications
Biogas has methane, CO₂, and trace H₂S. Silver Instruments thermal mass flow meters for biogas come with Hastelloy C sensors and PTFE‑coated parts. They handle moisture and small amounts of H₂S. For higher H₂S levels above 1000 ppm, we switch to a vortex meter with a corrosion‑resistant body.
A biogas plant in the Philippines recently replaced their old differential pressure meters with our inline thermal mass meters on DN80 pipes. Gas temperature is 40 °C, pressure 0.2 bar. The accuracy they need is ±1.5 % of reading. We configured the meter for a biogas composition of 60 % CH₄ and 40 % CO₂. Now they report flow data directly to the government feed‑in tariff system.
Options and Outputs That Matter in the Field
Industrial gas flow meters from Silver Automation Instruments include the following standard features:
4‑20 mA HART output, optional pulse or frequency output for remote totalization. RS485 with Modbus RTU is available on most models. Local displays show instant flow, totalized flow, temperature, and alarm status. For hazardous areas, we supply ATEX Ex d or Ex ia approvals for Zone 1 and Zone 2. Ingress protection is IP65, IP66, or IP67. Process connections range from wafer, flange (ANSI 150, PN16, JIS 10K), to threaded NPT.
Power supply is typically 24 V DC. For remote sites with solar panels, we can supply low‑power versions.
How to Get a Quote Fast
Send us the following data. This will help us propose the right model within one working day:
Gas type and composition, minimum, normal and maximum flow rate, operating pressure (bar or psi), operating temperature (°C), pipe size (DN or inches), pipe material, process connection type, required output signals, and hazardous area classification if applicable.
The more detail you share, the more precise the quotation. We can also include third‑party calibration certificates to ISO 17025.
FAQ
What is the difference between a thermal mass flow meter and a vortex meter for compressed air?
Thermal mass meters measure mass flow directly without needing pressure and temperature compensation. Vortex meters measure volumetric flow and need external pressure and temperature sensors for mass flow output.
Can I use an insertion air flow meter in a rectangular duct?
Yes. Insertion thermal probes work in rectangular ducts if you know the internal dimensions. We help with the conversion factor during configuration.
Do you have ATEX‑certified air flow meters?
Yes. We supply thermal mass and vortex flow meters certified for ATEX Zone 1 and Zone 2. Inline and insertion models are both available.
What maintenance do thermal mass flow meters require?
Sensors can get dirty in oily or particle‑laden air. An annual visual check and cleaning with isopropyl alcohol is usually enough. For biogas, we recommend cleaning every 6 months.
How long does delivery take to Australia or Southeast Asia?
Stock models ship within 5 working days. Custom configurations take 2 to 3 weeks. We dispatch from our factory by DHL, FedEx, or sea freight based on your preference.
Contact Silver Automation Instruments to discuss your air or gas flow measurement project.
Email: [email protected]
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
Web: www.flow-meter.com.au
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