Electrochemical VOC Sensors

VOC-A4 and VOC-B4 Alphasense Electrochemical VOC Sensors

Alphasense VOC Sensors

Since launching our ground-breaking range of Alphasense PPB Air Quality sensors back in 2014, we have continued to prioritise the development of low-cost sensors with the aim of improving global air quality. Following extensive R&D in the field of Volatile Organic Compounds, we are delighted to announce the launch of two new electrochemical sensors, the VOC-A4 and VOC-B4, both of which have been developed specifically to target VOC’s. 

Designed to work alongside our existing range of sensors, the VOC-A4 and B4 will detect a variety of compounds including Benzene, Formaldehyde and Ethanol. Both sensors have excellent response times, low power consumption and can be used in a bespoke circuit or with our individual sensor boards (ISB) in the case of the B4 or alongside other sensors in our multiport Analogue Front-End boards (AFE) in the case of the A4. 

The Alphasense VOC electrochemical VOC-A4 and VOC-B4 sensors are the perfect companions for our amperometric 4-electrode air quality sensors. In environmental air quality applications, the VOC-A4 and VOC-B4 should be used in combination with one of our A-Series (CO-A4) or B-Series (CO-B4) Carbon Monoxide sensors. Although we recommend using these sensors at 0V for air quality applications, the voltage for both the VOC-A4 and VOC-B4 can be altered to operate at V, 0.1V, 0.2V or 0.3V, allowing the option to detect a range of different gases.

If you have an application or would like to know more about this exciting development in VOC detection, please don’t hesitate to get in touch by phone or via sensors@alphasense.com

Key features

  • Suitable for various environmental air quality applications
  • Adaptable voltage from 0V to 0.3V
  • Available in both A-Series (20mm diameter, 16.5mm depth) and B-Series (32mm diameter, 16.5mm depth)
  • Can be adapted to measure Benzene, Formaldehyde, Ethanol, Toluene and Xylene
  • Minimal battery drain and maintenance
  • Excellent detection/response time


VOC-A4 electrochemical sensor

  • 20mm diameter, 16.5mm depth
  • 4 electrodes
  • 230 to 410 nA/ppm in 2ppm CO
  • < 30 t90 (s) from zero to 2ppm CO
  • ± 200 nA in zero air at 20°C


VOC-B4 electrochemical sensor

  • 32mm diameter, 16.5mm depth
  • 4 electrodes
  • 400 to 700 nA/ppm in 2ppm CO
  • < 30 t90 (s) from zero to 2ppm CO
  • ± 200 nA in zero air at 20°C

VOC electrochemical sensor FAQs

Application Notes

Click the button below to view and download Alphasense Application Notes.