Target: Refrigerant
Model: MH-Z1542B
Detection range: 0~5.00% Vol
Detection principle: non-dispersive infrared (NDIR)
Characteristics: High sensitivity, high resolution, fast response,UART output
Size: 32.9x22.3x11.9mm

MH-Z1542B Manual download
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MH-Z1542B refrigerant (R32) sensor is a smart infrared type sensor, using non-dispersive infrared (NDIR) principle to detect the existence of refrigerant, with good selectivity and non-oxygen dependent. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design. It is a compact high performance sensor made by combining mature infrared gas detection technology with micro machining and sophisticated circuit design. It is easy to use and can be directly to replace the catalytic type sensor.


  • HVAC
  • Industrial process and safety monitoring


  • High sensitivity, high resolution, fast response
  • UART output
  • Temperate compensation, excellent linear output, good stability, long lifespan
  • Anti-water vapor interference, anti-poisoning, direct replacement for catalytic sensors



 Model No. MH-Z1542B-R32
Detection Gas Refrigerant
Working voltage 3.6~5V DC
Average current < 85mA
Detection Range 0~5.00% Vol
Interface level 3.0 V
Output signal UART
Preheat time 3 min
Response Time T25 < 7 s
Working temperature -20 ~ 60℃
Working humidity 0 ~95% RH (No condensation)
Sizes 32.9x22.3x11.9mm
Weight 35 g
Lifespan >15 years


Detection Gas Formula Detection Range Resolution Accuracy
R32 CH2F2 0~50% LFL 1% LFL ± 3.75%F.S.

* 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.