Target: Mass gas flow monitoring of gas medium in the pipe
Model: FR03
Detection range: 0.2/0.3/0.4/0.5SLM
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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FR03 flow sensor adopts MEMS Thermal principle to monitor the flow of pipeline gas medium. This product adopts low pressure loss design and is widely used for all kinds of gas measurement.


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, 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 pickup flow;
  • High Accuracy;
  • Low voltage loss;
  • Modular design;
  • High measurement repeatability;
  • Surface mount structure


Model No. FR03
Flow measurement Maximum flow 500L/min @20℃ 101.325kPa
Measurement accuracy [25 ,500]mL/min: ±2.5% [0,25) mL/min: ±0.5%FS
Repeatability 0.50%
Working Pressure ≤200kPa
Burst pressure ≥0.7MPa
Working Temperature 0℃~50℃
Output signal Output method Digital IIC or analog voltage
Analog signal Linearity0.5V~4.5V
IIC communication rate 100kHz
Signal refresh time ≤1ms
Signal response time ≤3ms
Electrical interface PH2.0-5P plug-in connector
Other Working Voltage DC5V~14V
Working Current ≤30mA
Storage Temperature -20℃~80℃
Measurement Medium Dry and clean non-corrosive gas
△Pmax ≤2000Pa

* 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.