Target: CO, SO2, NO2, O3 (Scalable PM2.5, PM10, Temperature, Humidity)
Model: ZEHS04
Detection range: See manual
Detection principle: Module, electrochemical
Characteristics: Urban atmospheric environmental monitoring; Unorganized emissions of pollution monitoring at factory sites; Portable instruments, air quality monitoring equipment, and smart home equipment.
Size: 12cm*10cm*6cm (L*W*H)
Working conditions: Resolution 1ug/m3
Response time ≤ 120S
Working life 2 years (According to sensor's Working life)

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ZEHS04 is a diffusion type multi-in-one module, mounted with atmospheric monitoring module ZE12, to detect CO, SO2, NO2, and O3. It is also compatible to connect with dust sensor module, temperature and humidity sensor module externally. With TTL or RS485 output, it is convenient to use and debug, which greatly shortens the user’s design and development cycle, and meets customers’ needs for different gas detection occasions.


  • Urban atmospheric environmental monitoring.
  • Unorganized emissions of pollution monitoring at factory sites.
  • Portable instruments, air quality monitoring equipment, and smart home equipment.


  • High sensitivity, high resolution, long lifespan.
  • UART or RS485 output.
  • High stability, good anti-interference ability, excellent linear output.


Model ZEHS04
Target Gas CO, SO2, NO2, O3 (PM2.5, PM10, temperature and humidity expansion compatible)
Output UART(3V TTL, 5V compatible), RS485
Working Voltage DC 9~24V
Response Time ≤ 120S
Resume Time ≤ 120S
Resolution ≤ 10ppb
Working Temperature -20~50℃
Working Humidity 15~90% RH (no condensation)
Storage Temperature -20~50℃
Life Span 2 years (based on sensor life span)
Power Consumption ≤ 1W
Size 10x12x6cm (Lx Wx H)

* 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.