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Mass Flow Meter for Gas: High-Precision Industrial Thermal Controllers
Quick Answer: Silver Automation Instruments supplies thermal mass flow meters that measure gas mass flow directly without needing external temperature or pressure compensation. These meters support pipe sizes from DN15 to DN200, cover flow ranges from 0.1 kg/h to over 10 000 kg/h, and output 4-20 mA HART, RS485 Modbus, or pulse signals. Typical accuracy is ±(1.0 % of reading + 0.5 % FS) for air, natural gas, nitrogen, CO₂, and argon.
Why Engineers Choose Thermal Mass for Gas Measurement
Thermal mass flow meters use the principle of convective heat transfer. Two PT100 platinum RTDs sit in the gas stream. One sensor measures the gas temperature, the other is heated. The mass flow rate determines how much heat the gas takes away. This direct mass measurement needs no density correction. No additional pressure transmitter, no temperature sensor. That means fewer devices to install and calibrate.
Because the sensor responds to the number of molecules passing over it, changes in gas pressure or temperature do not fool the reading. A vortex or differential pressure meter would need compensation. A thermal meter does not. Engineers in air compressor rooms, nitrogen generators, and biogas plants prefer this principle for its stability.
How Our Meters Maintain High Precision in the Field
We build the sensors with reference-grade PT100 elements and weld them inside a 316L stainless steel sheath. The signal is linearised in a micro‑controller that stores calibration data for up to 10 gases. When you order, we load the curve for your specific gas. You can switch between gases later via the RS485 interface.
In practice, repeatability stays within ±0.2 % of reading. Long‑term drift is low because the heated sensor does not run hot. We keep it just a few degrees above the gas temperature. A paint manufacturer in Malaysia uses a Silver TMF‑600 inline meter on a DN40 line for nitrogen blanket gas. Over 18 months the zero drift was less than 0.1 % FS. They check it once a year with a reference flow meter.
Key Specifications and Model Selection
The inline TMF‑600 series covers DN15 to DN100. The insertion TMF‑610 model handles DN80 to DN200 and larger ducts. Both accept gas temperatures from –20 °C to +60 °C standard, and up to +150 °C with a remote head. Pressure rating goes to 16 bar, higher on request. Ex‑proof versions meet ATEX Zone 1 and Zone 2 (Ex d IIC T6).
Outputs: two 4–20 mA HART channels, RS485 Modbus RTU, and one pulse output. Power supply is 24 V DC. The local display shows mass flow (kg/h or Nm³/h), totaliser, and gas temperature. You can set alarm limits for low flow. The process connection options include threaded (BSPT or NPT), DN flange (ANSI or JIS), and Tri‑Clamp for food‑grade lines.
Select the inline TMF‑600 when you need the highest accuracy on small to medium pipes. Pick the insertion TMF‑610 for large pipes, ducts, or when you want to install the meter under a
Integration with PLC, SCADA, and Energy Management
The 4–20 mA HART output drops into almost any PLC analogue input card. The HART signal also carries diagnostics and flow totaliser values. With the RS485 Modbus output you can read nine process variables over a single twisted pair. The same port allows you to change the gas type or range table from the control room.
Here is the thing: many plants use these meters for cost allocation of compressed air, nitrogen, or natural gas. The totaliser output connects to a simple paperless recorder or a SCADA energy dashboard. A food factory in the Philippines uses our TMF‑600 meters to bill each production line for compressed air. The payback time was under six months because they found leaks that accounted for 15 % of their air consumption.
Send us your gas type, pressure (bar), temperature (°C), pipe size (DN), and flow range. We recommend the best model and give you a fixed price within 24 hours.
Installation and Maintenance Tips
Install the inline meter with 10 DN of straight pipe upstream and 5 DN downstream. Avoid mounting it at the lowest point of the pipe where condensate can collect. If gas can carry oil mist or fine dust, add a simple Y‑strainer upstream. The sensor cleaning is easy: remove the meter, soak the probe in a mild solvent, and blow it dry with instrument air.
For insertion meters, a 1.5″ full‑port ball valve lets you retract the probe while the line is under pressure. This saves a shutdown. We have seen this done on a biogas header in Thailand where the operator cleans the sensor every three months. Whole job takes 15 minutes.
FAQ
What gases can your thermal mass flow meter measure?
Any clean, dry gas: air, N₂, O₂, CO₂, natural gas, LPG, biogas, argon, helium, and many others. If the gas has high moisture or sticky particles, we suggest a different meter type.
Do I need external pressure and temperature compensation?
No. Thermal mass meters measure mass flow directly. You do not need separate T and P transmitters. That saves hardware cost and reduces potential failure points.
Can I use the same meter for biogas?
Yes. The TMF‑600 is available with FKM or FFKM seals and ATEX Zone 1 certification for biogas and landfill gas. We also offer a stainless steel V‑cone flow conditioner if the gas is dirty.
What is the turndown ratio?
Typically 100:1. Some measuring ranges reach 1000:1. One meter can read from a pilot flow up to the full plant load without changing the orifice.
How do I order or get a price?
Email [email protected] or message us on WhatsApp at +86-25-52155837. Tell us your gas, pressure, temperature, pipe size, and flow range. We will respond with a quote, usually within one business day.
Email: [email protected] | Tel: +86-25-68650347 | WhatsApp: +86-25-52155837 | WeChat: +86 15365082610
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