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3Wire TMF2X | Thermal Mass Flow Meter

3Wire Thermal Mass Flow Meter

TMF2X Compressed Air and Industrial Gas Flow Monitoring for IoTWatt 4.0

3Wire TMF2X Thermal Mass Flow Meter is designed for reliable gas mass flow measurement in industrial utility systems. It uses the thermal diffusion principle to measure gas mass flow directly, without requiring external pressure or temperature compensation.

For IoTWatt 4.0 projects, TMF2X provides the flow data needed to monitor compressed air systems, quantify leakage, calculate compressor specific power, identify abnormal usage and support digital energy audit evidence, EECA reporting and savings verification.

Thermal Mass Flow Compressed Air Monitoring Direct Mass Flow 0.1-100 Nm/s 4-20mA / RS-485 IP65 IoTWatt 4.0 Ready

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Product Type Thermal mass flow meter for compressed air and industrial gases

Measurement Direct mass flow measurement without external compensation

Outputs 4-20mA, RS-485, relay output and optional HART

IoTWatt Value Supports compressed air efficiency, leakage and specific power analytics

Overview: Make Compressed Air and Gas Consumption Visible

Compressed air and industrial gas systems are often high-cost utilities, but many sites do not have enough flow visibility. Without continuous flow measurement, leakage, wastage, abnormal demand and inefficient compressor operation can remain hidden.

TMF2X provides a practical way to monitor gas mass flow continuously. It is suitable for compressed air lines, gas distribution headers, process gas systems, nitrogen, oxygen, argon, biogas and other compatible industrial gases, except acetylene.

Key positioning

TMF2X is best positioned as an industrial thermal mass flow meter for compressed air monitoring, gas utility visibility, leakage detection, plant utility metering and IoTWatt 4.0 compressed air analytics.

How TMF2X Supports IoTWatt 4.0 Compressed Air Analytics

IoTWatt 4.0 can combine compressor electrical data with TMF2X air flow data to evaluate compressed air performance, leakage behaviour and operating efficiency.

1. Flow Data TMF2X measures compressed air or gas flow continuously.

2. Power Data Power meters measure compressor kW and energy consumption.

3. Gateway RS-485 or analogue data is collected by IoTWatt gateway.

4. IoTWatt 4.0 Dashboards, WattMind analytics, tickets and reports.

5. Action Leakage reduction, compressor optimisation and savings verification.

How TMF2X Measures Flow

TMF2X uses a constant temperature differential method to measure gas mass flow. Two platinum resistance temperature sensors are used. One sensor measures the actual gas temperature, while the second sensor is heated and maintained at a fixed temperature difference above the gas temperature.

As gas flows across the heated sensor, heat is removed from the sensor. The higher the gas velocity, the stronger the cooling effect. The meter measures the heater power required to maintain the temperature difference.

Measurement principle

The heater power required to maintain the temperature difference is directly related to gas mass flow rate, allowing TMF2X to measure gas mass flow without separate pressure or temperature compensation.

Key Features

Direct Mass Flow Measurement

Measures gas mass flow directly for accurate and stable readings without additional correction devices.

No External Compensation

Thermal mass flow measurement eliminates the need for separate pressure and temperature compensation.

Wide Measuring Range

Supports gas velocity measurement from 0.1 Nm/s to 100 Nm/s for low-flow and high-flow applications.

Low-Flow and Leak Detection

Suitable for low-flow monitoring and leakage detection in compressed air and industrial gas systems.

No Moving Parts

No moving mechanical parts, improving reliability and reducing maintenance requirements.

RS-485 Communication

Supports integration with PLC, SCADA, automation systems, data loggers and IoT gateways.

LCD

Local LCD Display

4-line LCD display can show mass flow, standard volume flow, totaliser, velocity and other values.

IP65

Industrial Protection

IP65 protection level with stainless steel 304 / 316 sensor housing material.

Installation Flexibility

Available in standard insertion, hot-tapped insertion and flanged sensor options.

Technical Highlights

Parameter	TMF2X Specification
Measuring Medium	Various gases, except acetylene
Measurement Principle	Thermal diffusion / constant temperature differential mass flow measurement
Connection	Insertion, flange and other options
Pipe Size	DN15 to DN300mm
Velocity Range	0.1 to 100 Nm/s
Accuracy	±1.5% RD + 0.5% FS
Ambient Temperature	-40°C to +60°C
Medium Temperature	-40°C to +150°C, higher temperature optional
Working Pressure	Insertion sensor: up to 1.6 MPa; flanged sensor: up to 1.6 MPa
Power Supply	24 VDC or 220 VAC
Output Signal	4-20 mA, RS-485, relay; HART optional
Response Time	0.5-1 second
Alarm Output	Relay, normally open state, 3A / 30VDC
Sensor Type	Standard insertion, hot-tapped insertion and flanged
Converter Type	Integrated and remote
Pipe Material	Carbon steel, stainless steel, plastic and others
Protection Level	IP65
Sensor Housing Material	Stainless steel 304 / 316
Display	4-line LCD showing mass flow, standard volume flow, totaliser, velocity and other values

Compressed Air Monitoring Value

Compressed air is one of the most expensive utilities in many factories. Without flow measurement, it is difficult to separate normal demand from leakage, artificial demand, poor operating control or inefficient compressor performance.

Monitoring Area	What TMF2X Provides	IoTWatt 4.0 Value
Flow Profile	Continuous compressed air or gas flow trend.	Understand consumption behaviour by hour, shift, area or process.
Leakage Baseline	Low-flow visibility during non-production or idle periods.	Identify leakage and abnormal standby consumption.
Specific Power	Flow data combined with compressor kW data.	Calculate compressor efficiency and track kW per flow output.
Abnormal Demand	Unexpected flow increase or unusual usage patterns.	Generate investigation tickets and operational alerts.
Savings Verification	Before and after flow profile comparison.	Support leakage repair savings and compressed air optimisation evidence.

Practical outcome

TMF2X gives IoTWatt 4.0 the air flow data needed to move from “compressor kWh only” to real compressed air efficiency analysis.

Flow Range and Sizing

TMF2X supports a broad pipe size range from DN15 to DN300mm, with standard and extended flow range options depending on application requirements.

For correct sizing, the pipe size, gas type, operating pressure, operating temperature, minimum flow, normal flow and maximum expected flow should be reviewed during product selection.

Selection note

For compressed air and gas monitoring projects, the flow meter should be selected based on real operating conditions, not only pipe size. Oversized or undersized flow meters may reduce measurement usefulness.

Typical Applications

Compressed Air Monitoring

Monitor compressed air consumption, distribution losses and abnormal air usage patterns.

Compressed Air Leakage Detection

Support low-flow detection and identification of abnormal compressed air losses over time.

Industrial Gas Monitoring

Measure nitrogen, oxygen, argon, biogas and other compatible industrial gases.

Plant Utility Metering

Measure gas usage for utilities, production areas, departments and internal cost allocation.

PLC / SCADA / IoT Integration

Transmit gas flow data to automation systems, data loggers, gateways and IoTWatt 4.0 dashboards.

Energy Efficiency Projects

Support compressed air efficiency studies, leakage reduction and gas consumption optimisation.

Integration with IoTWatt 4.0

When connected through RS-485, 4-20mA or a suitable IoT gateway, TMF2X can support advanced compressed air and gas monitoring through IoTWatt 4.0. This enables gas flow data to be combined with energy, production and equipment data for better efficiency analysis, cost tracking and sustainability reporting.

IoTWatt 4.0 Use	How TMF2X Supports It
Compressed Air Dashboard	Provides real-time flow and totalised compressed air consumption visibility.
WattMind Compressor Analytics	Supports compressor specific power analysis when combined with compressor electrical kW data.
Leakage Detection	Enables low-flow and non-production flow monitoring to identify leakage baseline.
Digital Energy Audit	Provides evidence for compressed air energy audit findings, operating patterns and improvement measures.
EECA / Energy Reporting	Supports utility-level data collection for energy management reporting and savings documentation.
WattSave Savings Verification	Supports before / after verification for leak repairs, pressure optimisation and compressed air improvement projects.

IoTWatt 4.0 call to action

Use TMF2X with IoTWatt 4.0 when compressed air or gas systems must be monitored not only for consumption, but also for efficiency, leakage, abnormal demand and verified savings.

Recommended Deployment Checklist

Confirm gas type and ensure the medium is compatible with the flow meter.
Confirm pipe size, pipe material and insertion / flange installation requirement.
Confirm normal, minimum and maximum expected flow range.
Confirm operating pressure and operating temperature.
Confirm required output: 4-20mA, RS-485, relay or optional HART.
Confirm power supply requirement: 24VDC or 220VAC.
Confirm straight pipe length, installation orientation and sensor insertion depth requirements.
Confirm IoTWatt 4.0 gateway, data polling interval, register mapping and dashboard requirement.

Related Keywords

3Wire TMF2X Thermal Mass Flow Meter Compressed Air Flow Meter Industrial Gas Flow Meter RS485 Flow Meter 4-20mA Flow Meter Compressed Air Leakage Detection Compressor Specific Power IoTWatt 4.0 Ready Compressed Air Energy Audit Digital Energy Audit Connectivity WattMind Compressor Analytics

TMF2X Product Visuals

The following visuals support the TMF2X thermal mass flow meter, insertion sensor configuration and product specification information above.

3Wire TMF2X Thermal Mass Flow Meter

TMF2X Thermal Mass Flow Meter product specification visual

TMF2X product specification visual

TMF2X Supply, Sizing and IoTWatt 4.0 Integration

Saturn Pyro supports 3Wire TMF2X thermal mass flow meters for compressed air monitoring, industrial gas metering, leakage detection, compressor efficiency analytics, IoTWatt 4.0 digital energy audit projects, EECA reporting data collection and verified savings initiatives in Malaysia.

Discuss IoTWatt 4.0 Integration