Biogas Flow Meter

Biogas Flow Meter is designed for the flow measurements of wet biogas in case of changing composition of gases without necessity of temperature and pressure correction under standard operation conditions.

The measuring principle of the meter is thermal mass flow measurement using two platinum RTD sensors, which gives stable readings regardless of the operating range.

Due to the absence of movable parts in the measuring channel, the meter requires minimum maintenance and provides reliable measurements of biogas flow in case of high moisture content.

It can be applied in the anaerobic digestion plants, sewage treatment plants, landfill sites, and waste-to-energy facilities.

• Measures biogas accurately using thermal mass flow technology.
• No moving parts for low maintenance and long service life.
• Negligible pressure drop, making it suitable for low-pressure biogas applications.
• High turndown ratio for measuring a wide range of flow rates.
• Handles scrubbed biogas containing CO₂, moisture, and H₂S.
• Available with horizontal and vertical mounting options.
• Full stainless steel construction for industrial durability.
• Electronic display with inbuilt battery-powered totalizer.
• High measurement accuracy with repeatable performance.
• Supplied with hazardous area and calibration certifications.

• Media: Biogas, Scrubbed Biogas (CH₄, CO₂, Moisture & H₂S)
• Flow Measurement: Mass Flow
• Flow Range: Suitable for pipe sizes from 3 mm to 12 inch
• Operating Pressure: Natural / Low Pressure Gas Applications
• Mounting: Horizontal or Vertical
• Pressure Drop: Negligible

Flow Conditioning of Biogas

The biogas gets into the meter housing and passes through the measuring section, where due to its internal design it provides the stabilization of the gas flow prior to the sensing element.

Thermal Measurement Principle

Two platinum RTD sensors get installed in the flow. One sensor registers the temperature of the gas flow, whereas another one maintains the fixed temperature difference relative to the first one.

Heat Losses Measurement

When the biogas flows around the heated sensor, it carries off part of heat. The quantity of heat losses is dependent on the gas flow rate, thus enabling the measurement of flow rate.

Signal Conditioning

The electronics maintain the fixed temperature difference by controlling the power supplied to the heated sensor. It is directly proportional to the gas flow rate.

Flow Rate Calculation and Output

The calculation and conversion of raw data in engineering units are performed inside the electronics of the flowmeter. Depending on the model, the processed information can be delivered to the monitoring system via one of the standard outputs (4-20 mA, pulse, RS485 Modbus). 

Size Configurations

• Line Sizing Range: Available for pipe diameters ranging from 3mm to 12 inches.

Material Options

• Body Metallurgy: Full stainless steel flow meter construction.

Power Supply

• DC Power Option: 24 VDC Isolated input line.
• AC Power Options: 230 VAC or 110 VAC main utility supply lines.
• Internal Battery Option: Inbuilt battery-powered totalizer system.

Output Signals & Communications

• Analog & Pulse Outputs: 4-20mA (4-wire execution) and Pulse output circuits.
• Digital Communication Bus: RS 485 MODBUS serial interface.

Structural Installation & Performance

• Mounting Orientations: Vertical and horizontal mounting capabilities.
• Performance Parameters: Accuracy rated at ± 2% of FSD, Linearity at +/- 0.5%, and Repeatability at 0.5%.
• Operational Design: Patented design engineered to work with natural pressures and scrubbed biogas containing CO2, moisture, and H2S.

For Biogas Uses: This meter is specially developed for moist and wet biogas use cases. The design of the meter that has no moving parts in the measuring part decreases the probability of clogging and minimizes maintenance needs.

Corrosive Gases Resistance: The sensors are engineered to operate in extreme environments, thus, the meter is good for methane, biogas, and other compatible process gases used in anaerobic digestion and wastewater treatment facilities.

Easy Integration into Systems: The flow meter measures the gas mass flow rate without temperature and pressure correction and does not need additional equipment. Moreover, the meter can be easily connected to PLC, DCS, and SCADA systems thanks to various output options.

Reliable Measurements in Time: Using thermal flow measurement technology allows for long-term stable readings.