Product Ranges

With more than 300 products detecting 28 different gases, City Technology offers the widest range of gas sensors in the market today. Whether you monitor common hazardous gases or more exotic gases, we have a solution in a format to suit the precise requirements of a specific application and instrument.

3 Series

The 3 Series range is City's original gas sensor range. A wide variety of sensors are available in this format and are can be supplied with 4-20mA and mV transmitter boards. The 7 Series is the natural replacement for the range.

4 Series

City’s 4-Series gas sensors are the industry standard for portable gas detectors. The range includes sensors which detect oxygen and toxic gases, an infrared version for carbon dioxide and hydrocarbons and fully certified pellistors for combustible gas detection.


Sensoric toxic gas sensors are now manufactured at our Portsmouth, UK site. Over the last 20 years, the range has gained worldwide recognition for excellent performance, particularly for detecting exotic gases. Sensors are available in a small ‘mini’ housing or can be supplied with adaptors to fit the 4- and 7-Series format. Sensoric sensors are also available with  4-20mA transmitter boards.

5 Series

City Technology’s range of premium gas sensors has been designed to ensure optimal performance within the harsh environments of flue gas analysers and combustion efficiency monitors. Sensors are available for oxygen, carbon monoxide, nitric oxide, nitrogen dioxide and sulphur dioxide, along with a hydrogen-compensated carbon monoxide sensor.


MICROceL® and MICROpeL® are City Technology’s smallest, most compact sensors. The range includes, carbon monoxide, hydrogen sulphide and fully certified combustible gas sensors.

7 Series

The 7-Series range is suited to general gas detection applications including oxygen and toxic gases. Sensors are suitable for use in portable or fixed gas detectors and medical gas applications.


City’s medical (MOX) sensors include oxygen and a range of other gas sensors that are designed specifically for use in respiratory and anaesthesia applications.


The ECOSURE range is designed for high quality CO detection in residential and commercial environments.

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