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Gas sensors are also based on different technologies such as catalytic combustion, electro-chemical infra red absorption (NDIR). However, metal oxide semiconductor (MOS) sensors excel in sensitivity, response time, long-term stability, cost and integrity. The disadvantage is lower selectivity. It means that the sensor is most sensitive to target gas but it also has some degree of sensitivity to other gases.
FIS also provides ozone sensor based on MOS technology as the only manufacturer in the world.
Although FIS is a specialist in MOS gas sensors, it also manufactures catalytic combustion sensor for hydrogen leak detector which is used in Toyota fuel cell vehicle Mirai.