Winsen ZE12A-O3 Electrochemical ozone sensor (0-1ppm) (O₃)


Highly sensitive electrochemical O₃ sensor with a measurement resolution of less than 10 ppb (parts per billion). UART output. Powered from 5V power supply.

Pre-orders only

On stock: Help 1

PLN 1 499,00
PLN 1 218,70 w/o VAT
EUR 325,86
EUR 264,93 w/o VAT

Tags: O3

Is ozone harmful?

Yes, it is! Information that can be found on the [GIOŚ - Polish Chief Inspectorate of Environmental Protection] ( website, states that if 25 times a year exposed to a level above 120 µg/m³ (about 56 ppb) it may adversely affect our health. Below this threshold, using the current state of knowledge, it is unlikely that it will have a harmful effect on human health or the environment as a whole. Is it a lot? Maybe not as little as in the case of nitrogen dioxide, but still quite a challenge to accurately measure this value.

How to measure it?

To know if the atmospheric O₃ concentration exceeds the allowed level, it is necessary to measure such negligible values. As you might guess, it is not easy. The Winsen ZE12A-O₃ electrochemical sensor can do this.

In our opinion, Winsen, while building this device, took care of almost everything. The electrochemical head is very accurate. AFE (analog frontend) and ADC (analog to digital converter) are built into the sensor itself. The sensor housing is made of metal, which makes it a miniature Faraday cage and shields electromagnetic interference, which is the bane of such accurate sensors. The ZE12A communicates with the environment via UART and analog DAC interfaces.

What influences the measurements?

Ozone level measurements conducted by an electrochemical sensor can be affected by a number of factors. The ones that have the greatest impact are the change in relative humidity and temperature. Very often ozone sensors are used in pairs with nitrogen dioxide sensors (NO₂).


  • Manufacturer: Winsen
  • Model: ZE12A-O3
  • Primary gas: Ozone (O₃)
  • Range: 0 - 1 ppm (0 - 1000 ppb)
  • Digital output: UART (3V3 logic levels, 5V compatible)
  • Analog output: DAC (0.4~2V)
  • Supply voltage: 5V ± 0.1V
  • Max voltage ripple: ≤30mV
  • Response time: ≤120 sec
  • Resolution: ≤10 ppb
  • Size: ⌀39 × 44 mm
  • Weight: 75g
  • Work conditions:
    • Temperature: -20~50°C
    • Humidity: 15%RH - 90%RH (no condensation)
  • Longevity: 2 years (in air)

Set includes:

  • Winsen ZE12A-O3 sensor
  • Mounting socket

Availability of larger quantities

Such accurate electrochemical sensors begin to age from the moment they are released from the factory. Their service life is limited to 2 years. We import them on special request only.