Natural gas flow meter

The thermal dispersion principle of this highly precise natural gas flow meter enables direct measurement of true gas mass flow rate without any need for separate measurements of temperature or pressure.

The unit is configured in a flameproof and PESO-certified enclosure which uses a platinum winding sensor inside 316 SS (stainless steel).

Unlike other natural gas flow metering designs available in the market today, this unique design has no moving parts and therefore results in minimal pressure loss and reduced maintenance requirements.

It is designed to work efficiently in both Piped Natural Gas as well as high-pressure cng gas flow meter configurations.

• Thermal mass flow measurement
• Direct mass flow measurement
• No pressure or temperature compensation required
• No moving parts for low maintenance
• Excellent low flow sensitivity
• Wide rangeability
• Negligible pressure loss
• Easy installation
• Flameproof PESO-certified enclosure
• Suitable for PNG and CNG applications

• Fluid: Natural Gas (PNG/CNG)
• Measuring Principle: Thermal Mass Flow
• Flow Range: 0 to 500 SM³/hr
• Operating Temperature: -40°C to 150°C
• Maximum Operating Pressure: 10 Bar
• Accuracy: ±3%
• Repeatability: ±0.5% of Reading
• Pressure Drop: Very Low
• Communication: RS485 Modbus
• Installation: Horizontal or Vertical

Gas Injection & Stream Straightening

 The fuel stream enters the meter housing directly from the distribution pipeline. To ensure accurate measurement, an internal conditioning element stabilizes the gas, eliminating erratic swirls and velocity spikes before the stream enters the active sensing chamber.

Kinetic Turbine Rotation

 As the gas moves forward, it strikes an aerodynamically angled rotor suspended in the flow path. The kinetic force of the moving gas turns the rotor, making it function as an efficient natural gas turbine meter. The rotor’s spinning speed changes in direct linear proportion to the volumetric flow velocity.

Non-Contact Pulse Generation

 A pickup sensor mounted on the solid outer pressure wall tracks every revolution without contacting the gas. As the metallic blade tips pass beneath the sensor, they disrupt a magnetic field to generate precise electrical pulses, completely eliminating mechanical friction and pressure boundaries.

Smart Pressure & Temperature Compensation Because natural gas expands or contracts under varying line conditions, integrated sensors track real-time temperature and pressure. The electronic transmitter uses these live readings to adjust raw pulse counts, converting uncompensated volume into standardized mass or volume units.

Telemetry Transmission & Automation The internal microcircuit displays the corrected values on a digital screen and broadcasts standard 4–20mA or RS485 Modbus signals. This output integrates directly with your plant’s PLC or SCADA system, serving as a reliable natural gas flow meter for automated fuel management and billing.

Size Configurations

• Nominal Sizing Span (DN): DN15, DN20, DN25, DN40, DN80, DN100, DN150
• Model Configurations: Inline Thermal Mass Flow Meter (PCD-TMF-IL) for pipe sizes ranging from DN15 up to DN150 NB

Material Options

• Body Construction: 304 Stainless Steel standard layout (316 Stainless Steel available as an optional MOC)
• Sensor Core Elements (MOC): Platinum Winding sensor encapsulated in SS 316
• Enclosure Casing: Flameproof Die-cast Aluminum electric enclosure certified by Petroleum and Explosives Safety Organisation (PESO)

End Connections & Fitting Ratings

• Process Fitting Adapters: BSP Threaded, DIN Flanged, and ANSI Flanged
• Flange Rating Variations: PN 16, PN 40, PN 100 (BS EN 1092-1) or ANSI 150, ANSI 300 RF (ANSI B16.5)

Operating Parameters & Performance Limits

• Flow Measurement Range: 0 to 500 SM³/HR
• Operating Temperature Limits: -40°C to 150°C
• Maximum Operating Pressure: 10 bar
• System Accuracy Baseline: ±3%
• System Repeatability Profile: ±0.5% of reading
• Pressure Drop Profile: Extremely low pressure loss (measured in terms of water column)
• Installation Layout Options: Horizontal or vertical flow pipeline mounting

Output Signals & Electrical Communication

• Analog Signal Outputs: 4-20 mA current loop or 3.5-10 Volt
• Digital Communication Architecture: RS 485 MODBUS
• Printing Accessories: Direct interface connection for offline thermal/dot matrix printer

No Need for Pressure and Temperature Calibration: Utilizing cutting-edge thermal dispersion technology, our thermal mass flow meter for natural gas directly measures mass flow without any additional recalibration of pressure or temperature values.

Ensure Optimal Safety in Explosive Areas: Constructed of explosion-proof, PESO certified flameproof enclosures, our flow meters accurately measure PNG and CNG lines in explosive areas without the possibility of fire occurrence.

Prevent Power Loss and Maintenance Shutdowns: With our natural gas flow meter, utilizing solid-state sensors with no moving parts, there is absolutely no pressure drop in your lines; hence, you won’t have any clogging, and will reduce your maintenance expenses.

Optimize Your Plant Automation: Our meters with 4–20 mA and RS485 MODBUS communication interfaces easily integrate into your plant automation systems.