Multigas sensor and multigas sensor device

摘要

A multigas sensor (200A) includes a multigas sensor element portion (100A) having: a NO_x sensor portion (30A) which detects the concentration of NO_x; and first and second ammonia sensor portions (42x, 42y) having different ratios between a sensitivity of ammonia and a sensitivity of NO_x. The multigas sensor element portion has a plate-like shape which extends in the direction of the axis O. A temperature detecting portion (6) used for controlling the temperature of the NO_x sensor portion is disposed in the multigas sensor element portion. The first and second ammonia sensor portions are disposed on the outer surface of the NO_x sensor portion so that at least parts of the first and second ammonia sensor portions overlap with a first region (6s) which is defined in the width direction by ends in the axial direction of the temperature detecting portion.