Gas Flow Sensors: Safe Electronic Mass Flow Monitoring for Process Gas Streams

Quick Answer: Silver Instruments supplies thermal mass flow meters for safe electronic mass flow monitoring on process gas streams. These meters cover pipe sizes from DN15 to DN200 and output signals such as 4-20 mA HART. Send us your gas type, pressure in bar, temperature in °C, pipe size in DN, and flow range for a quote.

Most engineers skip the simple question. What gas are you measuring? Natural gas, nitrogen, compressed air, hydrogen, argon, and biogas all behave differently. But the answer changes the quote.

We have seen this on customer sites many times. A plant team installs an orifice plate on a process gas line. The reading looks fine at one pressure. Then the line pressure drifts. The reading shifts. A thermal mass flow meter avoids this. It senses mass flow, not volume flow. This is the key difference for process gas streams.

How the Electronic Mass Flow Monitoring Works

The sensor head contains two PT100 platinum elements. One element gets heated. The other element measures gas temperature. The temperature difference relates to the gas mass flow rate. For dry gas streams this method is repeatable. The meter converts the signal into kg/h, standard cubic meters per hour, or normal cubic meters per hour. The electronics output 4-20 mA HART to the site PLC. Optional Modbus RTU is also available.

Where We Apply These Gas Flow Sensors

We see strong demand from oil and gas operators in the Middle East. They often ask for natural gas flow monitoring in flare headers and fuel gas lines. A line size of DN80 and a pressure of 6 bar is a common request. Our insertion gas flow sensor fits larger flare headers without heavy modification to the pipe.

A paint manufacturer in Southeast Asia needed compressed air monitoring. The line was DN40 and the air pressure was 7 bar. They used an inline thermal mass flow meter with a 4-20 mA output. The meter gave them direct kg/h data. This helped them track air consumption per batch.

In Oceania, a wastewater treatment plant used a gas flow sensor for biogas from a digester. The gas was wet and contained trace hydrogen sulfide. We supplied a meter with 316L wetted parts and a PTFE coated sensor. This setup lasted much longer than a standard unit.

Safety and Hazardous Area Options

Safe electronic mass flow monitoring matters when the gas is flammable. For natural gas, hydrogen, or biogas, you need the right certification. Silver Instruments can supply thermal mass flow meters with ATEX Zone 1 and Zone 2 electronics. The sensor can be fitted with a flameproof enclosure. Wetted parts in 316L stainless steel are standard for many process gas duties.

No moving parts in the flow path mean fewer leak points. There are no gears, bearings, or impulse lines. For hydrogen service this is important. Hydrogen has a very low molecular weight. A thermal mass flow meter can measure it directly. Most engineers skip the volumetric conversion and use kilogram per hour output instead.

Gas Flow Sensor Selection Data

We ask for five values before quoting a process gas flow meter. Gas composition, line pressure in bar, gas temperature in °C, pipe size in DN, and flow range. If you do not have a flow range, we can estimate from your line size and pressure. Send us the actual gas composition. Trace amounts of hydrogen sulfide or moisture change the material selection.

For low flow rates in small lines, an inline meter is better. A DN15 thermal mass flow meter can measure a few standard liters per minute. For large ducts or flare headers, an insertion sensor costs less. We supply insertion probes for pipe sizes from DN100 to DN2000. The probe length is cut to match the pipe inside diameter.

FAQ

What gas flow sensor types does Silver Instruments supply? We supply inline thermal mass flow meters and insertion gas flow sensors. Inline meters cover DN15 to DN200. Insertion probes cover DN100 to DN2000.

Can the thermal mass flow meter handle natural gas and hydrogen? Yes. Both gases can be measured with the same measurement principle. We need the gas composition and the pressure range. For hydrogen lines we often use 316L wetted parts and ATEX Zone 1 electronics.

What output signals are available? The standard output is 4-20 mA HART. Optional Modbus RTU is available. The meter displays kg/h, standard cubic meters per hour, or normal cubic meters per hour on the local LCD.

Do you supply ATEX Zone 1 gas flow sensors? Yes. We can supply flameproof enclosures for Zone 1 and Zone 2 gas applications. We ask for the gas classification and the local installation code before quoting.

How do I request a quote for a process gas flow meter? Send us your gas type, pressure in bar, temperature in °C, pipe size in DN, and flow range. Contact Silver Instruments at Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610.

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