Flow Meter
In industrial gas measurement, inaccurate compensation, pressure fluctuation, and density correction often lead to unreliable flow data. The Instrava Thermal Mass Flow Meter eliminates these variables by directly measuring mass flow based on thermal dispersion principle, without the need for temperature or pressure compensation.
Designed for industrial gas systems, it delivers high accuracy, stable performance, and long-term reliability in compressed air, natural gas, nitrogen, oxygen, biogas, and mixed gas applications.
Direct Mass Flow Measurement – No external temperature or pressure compensation required
High Accuracy – Up to ±0.1% measurement accuracy
Wide Temperature Range – Sensor up to 300°C
Digital Output & Communication – 4–20mA, Pulse, Frequency, HART, MODBUS
Explosion-Proof Available – Ex db IIC T6 Gb
Compact & Easy Installation – Integrated or remote type
For plant engineers and system integrators, this means reduced installation complexity and stable long-term performance.
Flow Meter Description
Thermal Flow Meter Key Advantages
No pressure or temperature compensation required
Measures true mass flow rather than volumetric flow
Also provides standard volumetric flow output
Accuracy up to 0.1% / 0.15%
Excellent repeatability and stability
Suitable for both single gases and mixed gases
Sensor temperature range: -40°C to 300°C
Pressure rating: ≤ 1.6 MPa
Pipe size range: DN15 – DN150
316L stainless steel construction
4–20 mA analog output
Pulse and frequency output
HART communication
MODBUS RS-485
Supports PLC, DCS, and SCADA systems
Integrated or remote transmitter options
LCD display with local keypad operation
IP65 / IP67 protection rating
Explosion-proof certification: Ex db IIC T6 Gb
Power supply: 220 VAC or 24 VDC
Thermal Mass Flowmeter Measurement Principle – Constant Temperature Difference Method
The thermal mass flow meter operates based on the thermal diffusion principle using two platinum RTD sensors:
One sensor continuously measures medium temperature (T1)
The second sensor is heated above medium temperature (T2)
When gas flows across the heated sensor, heat is carried away. To maintain a constant temperature difference (ΔT = T2 – T1), the system increases heating power.
The required power is directly proportional to the mass flow rate of the gas.
This constant temperature differential method ensures:
Direct mass flow measurement
High repeatability
Stable performance in fluctuating process conditions
Thermal Flowmeter Functional Capabilities
Mass flow measurement
Standard volumetric flow measurement
Totalized flow accumulation
Digital display and parameter configuration
Multi-signal output for automation integration
Thermal Mass Flow Meter Selection Guidance
When selecting a thermal mass flow meter, engineers should evaluate:
Gas composition (single or mixed gas)
Operating temperature range
Pipe diameter
Required communication protocol
Hazardous area classification
Instrava provides technical evaluation support for proper sizing and configuration.
Flow Meter Parameter
| Parameter | Specification |
|---|---|
| Structure | Integrated / Remote |
| Applicable Gas | Single Gas / Mixed Gas |
| Pipe Diameter | DN15 – DN150 |
| Process Pressure | ≤ 1.6 MPa |
| Process Connection | Flange (Thread optional ≤ DN50) |
| Sensor Temperature | -40°C ~ 300°C |
| Transmitter Temperature | -20°C ~ 60°C |
| Material | 316L |
| Protection Grade | IP65 / IP67 |
| Display | LCD with keypad operation |
| Measurement Functions | Mass Flow, Standard Volume Flow, Totalizer |
| Output | 4–20mA, Pulse, Frequency |
| Communication | HART / MODBUS RS-485 |
| Accuracy | ±0.1% / ±0.15% |
| Power Supply | 220VAC / 24VDC |
| Explosion Proof | Ex db IIC T6 Gb |
Instrava OEM/ODM
Reliable Instruments. Solutions That Fit Your Application.
Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven instruments from trusted manufacturers to ensure consistent quality, optimize solutions based on real working conditions to solve practical challenges, and provide tailored configurations to meet specific application needs.
By combining selection expertise with application understanding, Instrava helps customers reduce risk, improve efficiency, and achieve dependable results in complex industrial environments.
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What is the advantage of a thermal mass flow meter compared to volumetric flow meters?
Thermal mass flow meters directly measure mass flow using the constant temperature difference method. Unlike volumetric flow meters, they do not require pressure or temperature compensation, reducing system complexity and improving accuracy in gas applications.
What gases can be measured with a thermal mass flow meter?
They are suitable for compressed air, nitrogen, oxygen, natural gas, biogas, and many industrial mixed gases. Proper calibration ensures optimal performance for specific gas compositions.
Is a thermal mass flow meter suitable for high-temperature applications?
Yes. The sensor can operate up to 300°C, making it suitable for industrial furnace gas, process exhaust, and high-temperature gas monitoring applications.
Does the thermal mass flow meter support industrial communication protocols?
Yes. It supports 4–20mA, pulse, frequency outputs, and digital communication via HART or MODBUS RS-485 for integration into PLC, DCS, and SCADA systems.
Can it be installed in hazardous areas?
Explosion-proof models with Ex db IIC T6 Gb certification are available for use in hazardous industrial environments.
How do I select the correct thermal mass flow meter for my application?
Key factors include gas type, pipe diameter, operating temperature, pressure, and required communication protocol. Instrava provides engineering support for proper sizing and configuration.
Built on Consistency, Not Claims
We specialize in industrial analysis and detection, with a clear understanding of real-world operating environments and requirements.
Every instrument is evaluated based on performance, stability, and application suitability—not just specifications or pricing.
We work with trusted manufacturers to ensure stable supply, consistent quality, and dependable delivery.
Our recommendations are grounded in application understanding, helping customers avoid common issues and achieve reliable results.
Instrava is built to reduce uncertainty—so every decision you make is clearer, safer, and more reliable.
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