Switch Site: Alphasense Safety
Call: +44 (0)1376556700

Carbon Monoxide

MonoxideAlphasense 4-Electrode gas sensors operate using proven fuel cell technology.

The B4 series (4-electrode sensors) provides OEMs with reliable sensors for use in a number of high volume applications and especially Air Quality Networks where very low parts per billion (ppb) detection levels are required.

Strong signal levels combined with low zero current allows resolution to < 10 (ppb) and a wide operating range. The sensors are suitable for use in fixed installation sensing heads, portable safety instruments, urban/indoor air monitoring and stack gas analysers.

The B4 series of sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leak-proof housing is moulded with a colour coded top for ease of identification.

Application notes

Download Toxic Application Notes – see application notes for full details.

Data sheets

Go to downloads page

File Name Description Type Download Link
CO-B4 Compact, 4-electrode, low ppb Data Sheet
CO-A4 Small, 4-electrode, low ppb Data Sheet


Staying at the forefront of sensor technology guarantees the best solutions for our customers



Each and every sensor is manufactured to the highest standards and tested for long-term reliability



Through investment and innovation we strive to exceed environmental and legislative targets


Download Data Sheets

Get data on our sensors Download Data Sheets

Download Application Notes

Get technical information Download Application Notes


Any questions? Read our FAQs