Target: Measure the mass flow of gases in the pipe, dry and non-corrosive gases
Model: FR20
Detection range: 150/200/300
Detection principle: MEMS thermal principle
Characteristics: High sensitivity,Very low pickup flow,High Accuracy
Resolution and accuracy: ±(2+0.5FS)%
Working Temperature: -20℃~80℃

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FR20 gas flow sensor uses MEMS thermal principle to monitor the flow of pipeline gas medium, which is suitable for ventilator/anesthesia machine use in medical field/industrial process detection.


  • Widely used to measure non-corrosive, non-strong acid and strong alkali gases in industrial process control, dust particles counter, automated control, medical equipment, portable instruments, air quality sampling, intelligent building and environmental monitoring equipment.
  • Air samplers/analyzers/anesthetics/gas leak detectors/environmental air monitor/particle counters/Lighter fire automatic adjustment equipment/gas chromatography...


  • High sensitivity, very low starting flow;
  • High response speed;
  • High accuracy and repeatability;
  • Low pressure loss;
  • Modular structure design.


Model No. FR20
Channel Diameter ∅20mm
Flow measurement Maximum Flow Rate 200L/min  @20℃ 101.325kPa
Measurement Accuracy 9L/min~200L/min   ±2.5% 0~9L/min        ±0.5%FS
Repeatability 0.5%
Working Pressure ≤200kPa
Burst Pressure ≤0.7MPa
Woking Temperature 0℃~50℃
Electrical parameter Output Mode Digital IIC or linear analog voltage
Simulated Flow Linerarity 0.5V~4.5V
IIC Communication Rate 100kHz
Signal Refresh Time ≤1ms
Signal Response Time ≤3ms
  Working Voltage DC4.9V~14V
Working Current ≤30mA
Electrical Interface PH2.0-5P Plug - in connector
Others Storage Temperature -20℃~80℃
△Pmax ≤1000Pa
Measuring Medium Dry and 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.