With more than 300 products detecting 28 different gases, City Technology provides the widest range of gas sensors in the market today. Sensors are available in a number of different formats to suit specific applications.

We are pleased to announce the launch of the all new I Series Digital Sensors.  The digital output of the sensors provide significant advantages over conventional electrochemical gas sensors.  Please see more details below:



City Technology’s digital iseries gas sensor is a small sensor that enables low-profile gas detector design. The iseries sensors have turrets which mount into the front of the instrument in order to minimize instrument height.


With an extended operating life of five years, and an extended temperature and humidity range, iseries sensors are designed to meet multiple performance standards, including ANSI/ISA 92.00.01-2010, BS EN 45544-1:2015, and AS/NZS 4641-2007.


The digital output of the sensors provide significant advantages over conventional electrochemical gas sensors.

1 Series

City Technology’s 1 Series range of gas sensor resets the size standard for the gas detection industry, enabling a significantly more compact, low profile gas detector range.

The 1 Series range demonstrates an extended operating life of more than 5 years together with an extended environmental performance.

4 Series

The 4 Series range is the industry standard for use in portable gas detectors. The range includes sensors which detect oxygen and numerous toxic gases, along with an infrared version for carbon dioxide and hydrocarbon, and fully certified pellistors for combustible gas detection.

MICRO Series

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

7 Series

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

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.


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

3 Series

City Technology’s original toxic gas sensor product range is designed for use in general industrial safety applications, flue

gas emissions monitoring, ambient air monitoring, and medical gas applications. A wide variety of sensors are available in this format, many with 4-20 mA or mV transmitter boards.


The Sensoric range of electrochemical toxic gas sensors from City Technology has gained worldwide recognition for excellent performance, particularly when detecting exotic toxic gases.  With the ability to detect more than 20 different gases, Sensoric has the widest exotic toxic gas sensor offering in the market.

Common applications include wafer fabrication within the global semiconductor industry, food production and refrigeration, mining and metallurgy. Sensoric sensors are available in industry standard 4 and 7 series formats as well as the Sensoric range specific mini and classic series. All Sensoric sensors can be supplied with 4-20 mA transmitter boards.