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Landfill Gas Flow Meter: Corrosive Biogas Thermal Mass Sourcing Systems
Quick Answer: Landfill gas and biogas contain moisture, hydrogen sulfide, and siloxanes that attack standard flow meters. Silver Automation Instruments supplies thermal mass flow meters with 316L wetted parts, PTFE sensor coating, and 4-20 mA HART output for corrosive gas streams. Send your pressure (bar), temperature (°C), pipe size (DN), and flow range to get a firm quote within 24 hours.
Why Landfill Gas Flow Measurement Breaks Standard Flow Meters
A landfill gas flow meter has to handle a dirty gas stream. The gas comes from anaerobic digestion inside a waste mass. It is saturated with water vapor. It carries hydrogen sulfide, often 200 to 1000 ppm depending on the landfill age. It also contains siloxanes from household waste. When the gas cools, the moisture turns into acidic condensate. That condensate eats carbon steel and standard aluminum flow sensors within weeks. We have seen this on customer sites many times. Operators in Southeast Asia and the Middle East often try a differential pressure flow meter first. The impulse lines block with moisture. A turbine meter rusts. A vortex meter loses signal when the pipe drains with slug flow. This is where a thermal mass flow meter makes sense. Last year a customer in Vietnam asked us to replace a turbine meter after two months of service. The bearing had corroded from hydrogen sulfide. The replacement thermal mass meter has run for 14 months without a zero drift issue.
Most engineers skip this part. The gas composition changes with landfill cells, time of day, and temperature. High moisture does not just affect the sensor. It also changes the heat transfer property of the gas. A thermal mass flow meter measures mass flow directly. That means no separate temperature and pressure compensation is needed for most biogas flaring and gas engine applications.
Thermal Mass Flow Meters Handle Saturated Biogas and Corrosive Condensate
Thermal mass flow meters from Silver Automation Instruments use insertion or inline designs. For landfill gas, we normally recommend an inline thermal mass flow meter with a 316L stainless steel body. The sensor elements are PTFE coated. The electronics are IP67 rated. A typical gas temperature range is -20 to 120 °C. A typical flow range is 0.5 to 120 Nm3/h for a DN50 pipe. For a DN80 pipe, we can cover up to 300 Nm3/h. Accuracy is ±1.5 percent of reading from 0.5 to 100 percent of the flow range. Repeatability is ±0.5 percent of reading. Output is 4-20 mA HART with Modbus RTU as an option. Power supply is 24 V DC. The sensor uses two PT100 RTD elements to detect the cooling effect of gas flow. That fits most biogas flare skids and gas engine control panels.
Here is the thing. Corrosive biogas does not just need a corrosion resistant sensor. The flow meter also needs a low pressure loss. Landfill gas moves under low pressure, often 0.1 to 0.5 bar(g). A thermal mass flow meter has a straight flow path with no moving parts. That avoids the mechanical wear found in turbine meters and diaphragm meters. It also provides a fast response time of about 1 second. That matters when a flare system or gas engine ramps up and down.
Key Specs for a Landfill Gas Flow Meter
For a typical landfill gas collection header, we suggest a DN50 or DN80 inline thermal mass flow meter. Specify 316L wetted parts. Request PTFE coated sensor tips if H2S goes above 500 ppm. Request a purge port block on the probe for field cleaning. The transmitter should have ATEX Zone 1 or Zone 2 certification depending on the site. Many landfills in Sou
Because the moisture turns acidic, 316L alone is not always enough. The condensate viscosity sits near 1 cP. The pH can drop below 4. Landfill gas also carries droplets with conductivity above 15,000 µS/cm. Those droplets damage exposed electrodes and uncoated sensor surfaces. So we usually suggest an inline meter with a purge port and PFA coated wetted parts for long term service.
Sourcing Thermal Mass Flow Meters for Southeast Asia, Middle East, Latin America, Africa
Silver Automation Instruments is a flow meter manufacturer and supplier. We ship to landfill operators, EPC contractors, and skid builders in Vietnam, Thailand, Malaysia, Indonesia, Australia, Saudi Arabia, UAE, Chile, and South Africa. We build each flow meter to the process data you provide. Send us pressure (bar), temperature (°C), pipe size (DN), and flow range. We will reply with a data sheet, a quote, and a delivery time within 24 hours. You can reach us by Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, WeChat: +86 13512131526. We keep spare sensors and transmitters in stock for fast replacement.
In practice, most engineers source a thermal mass flow meter for landfill gas with a 10 to 12 week lead time from local reps. But we reduce that to 3 to 4 weeks for standard DN50 and DN80 models with ATEX Zone 2 certification. If you need a higher H2S tolerance, we add a PFA coating to the sensor and a Hastelloy C body option. That adds about 10 days to production.
FAQ
Q: What flow meter is best for corrosive landfill gas?
A: A thermal mass flow meter with a 316L body and PTFE or PFA coated sensors. It resists acidic condensate and hydrogen sulfide better than turbine or vortex meters.
Q: Do I need temperature and pressure compensation for biogas flow measurement?
A: No. Thermal mass flow meters measure mass flow directly. That means you do not need a separate RTD, pressure transmitter, and flow computer for most flare and engine applications.
Q: Can the flow meter handle saturated gas and slug flow?
A: Yes. The inline design has no moving parts. The sensor recovers fast after liquid slugs. This is a major reason landfill operators prefer thermal mass over differential pressure.
Q: What signal output should I specify for landfill gas?
A: 4-20 mA HART is standard. Add Modbus RTU if you use a PLC or remote monitoring system. Ask for ATEX Zone 1 or Zone 2 certification based on your site classification.
Q: How do I get a quote from Silver Automation Instruments?
A: Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Contact Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, WeChat: +86 13512131526. We reply within 24 hours.
Need a thermal mass flow meter for corrosive biogas?
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, WeChat: +86 13512131526. Silver Automation Instruments will match a model to your landfill gas collection header or flare line.