Target: Refrigerant,R454B
Model: MH-441D-454B
Detection range: 0~5%VOL
Detection principle: NDIR
Characteristics: High sensitivity, high resolution, fast response,Output method: UART, analog voltage signal...
Size: Φ20×22.4mm
Response time: T90<30 seconds

MH-441D-454B Manual download
Get Price Whatsapp


MH-441D-454B refrigerant sensor is an intelligent infrared gas sensor (hereinafter referred to as the sensor), which uses the principle of non-dispersive infrared (NDIR) to detect refrigerant (label 454B), which has good selectivity and no oxygen dependence ; The sensor is a compact high-performance sensor produced by combining mature infrared absorption gas detection technology with micro-machining and sophisticated circuit design. It is easy to use and can be directly used to replace the catalytic combustion element.


  • HVAC refrigeration,
  • Industrial-process control and safety protection


  • High sensitivity, high resolution, fast response
  • Output method: UART, analog voltage signal
  • Temperature compensation, excellent linear output, Excellent stability, Long lifespan
  • Anti-poisons, anti-vapor interference, Can replace catalytic type gas sensor directly


Part Number MH-441D
Detection Gas 454B
Detection Range 0~5%VOL
WorkingVoltage 3.6~5VDC (Require powered by safety barrier)
Average Current <85mA
Detection Range 0~5.00% Vol
Interface Level 3.0V
OutputSignal UART
0.4~2.0VDC(Requireoutput by safety barrier)
Warm-up time 3 min
Response time T90<30 seconds
WorkingTemperature -20°C ~ 60°C
WorkingHumidity 0~95%RH(no condensation)
Sizes Φ20×22.4mm
Weight 35g
Lifetime >5 years
Defense Grade IP54
Power, communication terminal Intrinsic safety Ui=7.5VDC,Ii=265mA, Pi=0.5W,Ci=10μF,Li=0mH

* 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.