Profile: City Technology Ltd. specializes in the design, manufacture and supply of high quality gas sensors. Our quality management systems are certified to ISO 9001 quality standard. Our products serve sectors like industrial, emissions, automotive, medical and other related applications. 3-series is our toxic gas sensor product range. It includes sensors for general industrial safety application, flue gas emissions monitoring, ambient air monitoring and medical gas applications. Our 4-series gas sensors are the industry standard for use in portable gas detectors. They are available for oxygen, an extensive range of toxic gases, and also a range of fully certified pellistors for combustible gas detection. Infrared sensors for carbon dioxide and hydrocarbon detection are also available in the 4-series.