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Inline Thermal Mass Flow Meter Direct Gas Sizing without External Temperature and Pressure Corrections
Quick Answer: An inline thermal mass flow meter measures gas mass flow directly in kg/h or Nm3/h. You do not need separate pressure and temperature compensation for most standard gas flows. Silver Automation Instruments supplies inline meters from DN15 to DN100 with 4-20 mA HART and Modbus outputs.
How Direct Gas Sizing Works
Thermal mass flow measurement uses two PT100 sensors in the gas stream. One sensor reads the gas temperature. The other sensor is heated. Gas molecules carry heat away from the heated sensor. The cooling effect is proportional to mass flow. Because the meter measures mass directly, changes in line pressure or gas temperature do not require external correction factors.
Most engineers skip the extra wiring and extra transmitters. In practice, a standard compressed air line at 6.0 to 8.0 bar does not need a pressure transmitter connected to the flow meter. A gas line at 30 °C or 50 °C does not need a separate temperature input. The inline thermal mass flow meter reports kg/h directly on the local LCD.
No External Temperature or Pressure Transmitters
Many gas flow systems use an orifice plate or a vortex meter. Those devices measure velocity or differential pressure. Then a flow computer corrects for pressure, temperature, and compressibility. That means extra fittings, extra leak points, and extra calibration. An inline thermal mass flow meter removes that step for clean and dry gases with steady composition.
We have seen this on customer sites many times. A paint manufacturer in Vietnam replaced a turbine meter with a Silver Instruments inline thermal mass meter on a 3 inch nitrogen line. The old setup needed a pressure transmitter, a temperature sensor, and a flow computer. The new setup is one spool piece with a local display and 4-20 mA HART output.
Inline Sizes, Accuracy and Outputs
Silver Instruments offers inline thermal mass flow meters with wafer, threaded, or flanged connections. Standard body sizes cover DN15, DN20, DN25, DN40, DN50, DN80, and DN100. Wetted parts are 316L stainless steel. The display can show Nm3/h, kg/h, total flow, and gas temperature.
Typical accuracy is ±1.5 percent of reading from 0.3 to 100 Nm/s. Turndown is 100:1. Response time is under 1 second. The standard electronics include 4-20 mA HART, RS485 Modbus RTU, and pulse output. ATEX Zone 1 or Class I Division 2 options are available for hazardous area gas lines.
Gas Types and Factory Calibration
The same meter can be calibrated for air, nitrogen, oxygen, carbon dioxide, natural gas, biogas, argon, or methane. Tell us the gas composition when you send the inquiry. For biogas with 60 percent methane and 40 percent carbon dioxide, we set the meter at the factory for that specific gas mix.
For stable gas composition, the inline thermal mass flow meter holds its direct mass flow reading without external corrections. If the gas composition changes frequently, an external gas analyzer may still be needed. For standard compress
Installation and Site Notes
Install the inline meter with straight run upstream and downstream. For most installations, 10D upstream and 5D downstream is enough. Avoid installing directly after a control valve or elbow when you can. In tight pipe racks, a flow conditioner can help. The meter comes with a local display and an IP65 or NEMA 4X housing.
Power is 24 VDC standard. 85 to 265 VAC is also possible. The local display is a 2.8 inch LCD with totalizer reset and diagnostic messages. The meter stores calibration data in the sensor head. Replacement of electronics does not require a full recalibration in most cases.
Applications in Your Regions
Australia and Oceania customers use these meters for natural gas generator fuel lines and compressed air auditing. Middle East customers use them for nitrogen blanketing on chemical storage tanks. Southeast Asia food and beverage plants use them for carbon dioxide and compressed air lines. Latin America water treatment plants use them for oxygen feed to ozone systems.
A customer in Saudi Arabia asked us for a DN50 inline thermal gas meter for methane rich gas at 2.5 bar and 45 °C. We quoted a 316L stainless steel body, ATEX Zone 1 approval, and 4-20 mA HART output. The order shipped within 3 weeks.
How to Request a Direct Sizing Quote
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Include the gas type or gas composition if it is mixed. A clear inquiry gets a fixed price within 24 hours. We include datasheets, dimensional drawings, and calibration certificates.
Contact Silver Automation Instruments today. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Our website is flow-meter.com.au.
FAQ for Inline Thermal Mass Flow Meter Gas Sizing
Do I need an external pressure transmitter for a thermal mass flow meter?
No. The inline thermal meter measures mass flow directly. It does not need pressure correction for standard gas lines with stable composition.
Can I use one meter for different gases?
Yes, but the meter must be factory calibrated for the specific gas or gas mix. Changing gas type after installation can affect accuracy.
What is the minimum and maximum pipe size?
Standard inline models cover DN15 to DN100. Custom sizes are available for larger pipes. Insertion thermal meters cover larger ducts but that is a separate product.
What output signals are available?
Standard outputs include 4-20 mA HART, RS485 Modbus RTU, and pulse output. Optional outputs include Profibus DP and relay alarms.
Can the meter be installed in an ATEX Zone 1 area?
Yes. Silver Instruments offers ATEX Zone 1 and Class I Division 2 certified versions. Specify the hazardous area class and gas group in your inquiry.
Tell us the gas type, pressure, temperature, pipe size, and flow range. We will reply with a direct sizing proposal and a fixed price.
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