Target: Mass gas flow monitoring of gases in the pipe
Model: FR03H
Detection range: 5L/min @20℃ 101.325kPa
Detection principle: MEMS thermal principle
Characteristics: High sensitivity,Very low pickup flow,High Accuracy
Resolution and accuracy: ±(2+0.5FS)%
Working Temperature: -20℃~80℃

FR03H Manual download
Get Price Whatsapp


FR03H flow sensor uses the MEMS thermal principle to monitor the flow of pipeline gas media. This product adopts low pressure loss design and is widely used in various types of gas flow measurement.


Widely used to measure non-corrosive gases in industrial process control, dust particles counter, automated control, medical equipment, portable instruments, air quality sampling, smart building and environmental monitoring equipment.


  • High sensitivity.
  • Extremely low initial flow rate.
  • High precision.
  • High measurement repeatability.
  • Low pressure loss.
  • Modular design.
  • Digital IIC or linear analog voltage output


Product number








Flow measurement


Maximum flow


5L/min  @20℃ 101.325kPa




[ 0.15, 5]L/min ±2.5%








work pressure




Burst pressure




Operating temperature




output signal


output method


Digital IICor linear analog voltage


Simulate traffic




IICcommunication rate




Signal refresh time


≤1m s_


Signal response time




Electrical parameters


Operating Voltage




Working current




Electrical Interface


PH2.0-5Pplug-in connector or


2.54mm-5P pin












Measuring medium


Dry, clean, non-corrosive gas


* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.