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Thermal Mass Gas Flow Meter: Inline Industrial Vapor Mass Sourcing
Quick Answer
Inline thermal mass flow meters from Silver Automation Instruments deliver direct mass flow output for clean industrial vapor and gas service. Silver Automation Instruments is a manufacturer and supplier of TMF inline series thermal mass flow meters for vapor mass measurement. Send your gas composition, pressure in bar, temperature in °C, pipe size DN, and flow range in kg/h or Nm3/h for a matched model and price.
What Makes Inline Thermal Mass Flow Meters Practical for Vapor Mass
Thermal mass flow meters use two RTD sensors. One sensor is heated. The other sensor reads the process gas temperature. When vapor passes across the heated sensor, the cooling effect changes with mass flow. Because the output tracks mass directly, engineers can send one 4-20 mA HART signal to a PLC or flow display without adding a separate flow computer.
This is useful for chemical vapor lines, solvent recovery, compressed air headers, natural gas sub-metering, purge gas, and nitrogen blanketing. In practice, most engineers skip differential pressure devices for these applications because line pressure swings create extra calculation work.
Inline vs Insertion Thermal Mass Flow Meters
For pipe sizes from DN15 to DN200, inline thermal mass flow meters are simpler to install and calibrate. The meter body fits directly in the process line with threaded or flanged connections. Insertion thermal mass flow meters work better for large ducts and pipes above DN200. Inline designs deliver better accuracy in small and mid-size vapor lines.
If the vapor is saturated steam, do not select a thermal mass flow meter. Use a vortex flow meter with temperature and pressure compensation, or use a Coriolis mass flow meter. This prevents sensor fouling and drift on wet steam service.
Common Specifications for Silver Automation Instruments Inline Thermal Mass Flow Meters
The TMF inline series covers DN15, DN20, DN25, DN40, DN50, DN80, DN100, DN150, and DN200 line sizes. Threaded process connections include NPT, G, and R type. Flanged connections include ANSI 150, ANSI 300, JIS 10K, and DIN PN16.
Standard output is 4-20 mA with HART. Optional RS485 Modbus is available for digital communication. Flow range depends on gas type and pipe size. A DN25 unit may cover 0.1 to 150 kg/h for air. A DN80 unit may cover 5 to 1200 kg/h for natural gas. Wetted materials are commonly 316L stainless steel. For corrosive vapor, ask about Hastelloy C or PTFE-coated sensor options.
Process temperature is typically -40 to 200 °C. Pressure rating depends on the body and process connection, often up to 16 bar or 40 bar for special designs. Power supply is 24 VDC. Accuracy is usually 1 percent of reading plus 0.5 percent of full scale. Turndown can reach 100:1. For hazardous areas, ATEX Zone 1 and Zone 2 versions are available.
Applications Where Inline Thermal Mass Flow Meters Work Well
Chemical vapor mass flow after evaporation or drying is a common fit. Solvent recovery lines, fuel gas to burners, compressed air loops, purge gas lines, CO2 dosing in food and beverage lines, and natural gas flow to ovens also match well. A paint manufactu
For biogas from anaerobic digesters, select a thermal mass flow meter with corrosion-resistant sensor materials. Biogas is wet and dirty. Without proper sensor protection, the measurement will drift. Ask the supplier for gas cleaning recommendations before purchase.
Vapor Mass Sourcing: What to Check Before You Buy
Do not send an inquiry with only line size and fluid name. That creates long back and forth delays. We need gas composition, moisture content, minimum and maximum flow rate in kg/h or Nm3/h, operating pressure in bar, operating temperature in °C, pipe size DN, process connection type, and hazardous area requirement if any.
Here is the thing. Many sourcing teams choose a thermal mass flow meter too late. The line is already installed and the process conditions are not stable. Send the full data set at the start. A sales engineer at Silver Automation Instruments will reply with a matched inline thermal mass flow meter model, datasheet, delivery time, and price in USD or EUR.
We support customers and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Documents and technical replies are available in English.
For a fast quote, contact Silver Automation Instruments.
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FAQ
Can a thermal mass flow meter measure saturated steam vapor?
No. Thermal mass flow meters are not recommended for saturated steam. Use a vortex flow meter with temperature and pressure compensation or a Coriolis mass flow meter.
What gas types can an inline thermal mass flow meter handle?
Clean dry gases and vapors are best. Examples include air, nitrogen, argon, CO2, oxygen, natural gas, biogas, and chemical vapors that do not condense on the sensor.
What is the typical price for an inline thermal mass flow meter?
Price varies by DN size, material, transmitter type, and approvals. A small DN15 inline unit costs less than a DN100 flanged ATEX Zone 1 unit. Send the full process data for a firm quote.
Does the meter need temperature and pressure compensation for mass flow?
No. The meter measures mass flow directly based on cooling effect. For standard gas conditions, the display or PLC can convert to Nm3/h if the gas composition is fixed.
Can Silver Automation Instruments supply ATEX or IECEx versions for vapor service?
Yes. ATEX Zone 1 and Zone 2 options are available for many inline thermal mass flow meter models. Confirm the gas group and temperature class with your inquiry.
For industrial vapor mass flow sourcing, the inline thermal mass flow meter is a strong option when the vapor is clean and dry. Silver Automation Instruments supplies standard and hazardous area versions from DN15 to DN200. Send your pressure in bar, temperature in °C, pipe size DN, gas composition, and flow range to get a firm quote and delivery schedule.