Thermal gas mass flow meter

GLM200 Thermal Gas Mass Flow Meter | GAIMC

Product Overview

The GLM200 Thermal Gas Mass Flow Meter measures gas flow rate based on the thermal properties of gases, detecting the constant temperature difference of the medium to provide high-accuracy measurement results. Its sensor consists of two reference-level Pt100 temperature sensors: one detects the medium temperature, while the other maintains a constant temperature higher than the medium—ensuring measurement is not affected by high temperature or pressure changes.

With a 100:1 range ratio, the GLM200 can measure gas flow from 0.5Nm/s to 100Nm/s (suitable for gas leak detection) and supports direct measurement of gas mass flow or standard volume flow. It has no moving parts or pressure-detecting components, ensuring strong vibration resistance and long service life. Multiple installation types (insertion, flange, thread, clamp-on) enable easy on-site installation and maintenance, even during system operation.

GLM200 Thermal Gas Mass Flow Meter Sensor

Key Features

🌡️

No Temp/Pressure Compensation

Direct measurement of gas mass flow, no need for additional temperature/pressure compensation, simplifying operation.

📏

100:1 Wide Range Ratio

Measures 0.5~100Nm/s gas flow, suitable for low-flow monitoring and gas leak detection.

🛡️

Strong Vibration Resistance

No moving parts, accuracy unaffected by vibration, long service life in harsh industrial environments.

🔧

Easy Installation

Multiple types (insertion/flange/thread/clamp-on), install/maintain without system shutdown.

💻

Digital Circuit Measurement

Full digital circuit design ensures high accuracy; supports RS485 for automation system integration.

📊

Multi-Parameter Display

4-line LCD shows mass flow, standard volume flow, accumulated flow, medium temperature, etc.

Technical Specifications

Parameter	Details
Measuring Medium	All gases (except acetylene)
Pipe Diameter	Flange type: DN10~DN80; Insertion type: DN100~DN6000
Flow Rate Range	0.5~100 Nm/s
Operating Temperature	Sensor: -10℃~+200℃; Transmitter: -20℃~+45℃
Operating Pressure	Medium pressure: ≤10MPa (flange type); ≤2.5MPa (insertion type)
Power Supply	Compact type: DC24V / AC220V (≤18W); Remote type: AC220V (≤19W)
Response Time	≤1s
Output Signal	4-20mA (optical isolation, max load 500Ω); RS485 (optical isolation); HART (optional)
Pipe Material	Carbon steel, stainless steel, plastic, etc.
Display (Compact Type)	4-line LCD (shows mass flow, standard volume flow, accumulated flow, medium temp.)
Protection Level	Sensor: IP65
Sensor Material	Stainless steel, stainless/carbon steel

Model Selection Specification

Example: GLM200-E-DN50-A-5-2-1-J (Flange pipe type, DN50, SUS304, 1.6MPa, 4-20mA, DC24V, integrated display)

Model Segment	Code	Description
GLM200	-	Product Series (Thermal Gas Mass Flow Meter)
Sensor Type	C	Retrench pattern insert type
	D	Online pluggable type
	E	Flange pipe type
	F	Thread pipe type
	G	Clamp-on type
Pipe Diameter	DNXX	Round pipe: DN15~DN6000
Housing Material	A	SUS304
	B	SUS316
	C	Other material (customizable)
Pressure Rating	5	1.6MPa
	6	2.5MPa
	7	4.0MPa
Output Signal	1	4-20mA
	2	RS485
	3	PULSE
	4	Relay contact
	5	HART
Power Supply	1	DC24V
Power Supply	2	AC220V
Display Type	J	Integrated display
Display Type	S	Split display

Core Applications

🏭

Power Industry

Measurement of primary/secondary air in thermal power plants; no moving parts to avoid pipe blockage.

💧

Water Treatment

Air flow measurement in aeration tanks; dirt-resistant, easy to disassemble and clean.

⛓️

Metallurgy

Blast furnace gas/coke oven gas measurement; hydrogen/oxygen control for steel quenching.

🍶

Food & Pharma

CO₂ measurement in breweries; exhaust gas monitoring in fermentation tanks.

🛢️

Petrochemical

Flue gas emission monitoring; ammonia measurement in fertilizer plants.

🏗️

Glass & Ceramic

Gasifier inlet control; hot exhaust flow monitoring in cement vertical mills.

🔌

Electronics

Gas measurement in battery factories; high-purity gas monitoring in laboratories.

🌬️

Air Separation

Gas flow measurement in air separation plants; aids in air distribution processes.

FAQ

What gases can the GLM200 measure?

The GLM200 is suitable for measuring all gases except acetylene, including air, oxygen, nitrogen, natural gas, coal gas, chemical gases, and high-purity gases. It is widely used in industrial scenarios such as power, metallurgy, and petrochemicals.

Why doesn’t the GLM200 need temperature/pressure compensation?

It uses the thermal mass flow measurement principle: the sensor detects the heat loss of the heating element caused by gas flow, which is directly related to the gas mass flow rate. This eliminates the need for additional temperature/pressure compensation, simplifying the measurement process and improving accuracy.

What installation types are available for the GLM200?

Five installation types to meet different scenarios: retrench pattern insert type (for large pipes), online pluggable type (no shutdown maintenance), flange pipe type (DN10~DN80), thread pipe type (DN15~DN80), and clamp-on type (non-invasive installation).

Can the GLM200 be used for gas leak detection?

Yes. With a 100:1 range ratio, it can measure low flow rates as low as 0.5Nm/s, making it suitable for gas leak detection in pipelines, tanks, and other equipment—providing early warning of potential leaks.

What communication protocols does the GLM200 support?

It supports RS485 (Modbus-RTU protocol) for integration with industrial automation systems, and optional HART protocol for remote configuration and monitoring. The 4-20mA analog output enables direct connection to PLC/DCS for real-time flow monitoring.

Custom Gas Mass Measurement Solution

Tailor the GLM200 Thermal Gas Mass Flow Meter to your industrial needs—choose from installation types, housing materials, pressure ratings, and output protocols. Our technical team provides on-site calibration, installation guidance, and after-sales support.

Get Custom Solution

Online Message

Have questions? Need a quote? We are ready to help! Fill out the form and a member of our sales team will contact you to discuss your requirements. You can also give us a call at (86)177-9158-1665.

GLM200

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HOT KEYWORDS

GLM200 Thermal Gas Mass Flow Meter 0.5~100Nm/s Flow 100:1 Range Ratio -10~+200℃ Temp IP65 Protection ≤10MPa Pressure ≤1s Response Time Flange Type Insertion Type Thread Type Clamp-on Type Power Industry Water Treatment Metallurgy Petrochemical 4-20mA Output RS485 (Modbus) SUS304/SUS316 HART Protocol

GLM200

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