Abstract: Display with high visibility without impairing rigidity of a housing is performed. A light curtain includes: a housing in which one element of a pair of elements disposed inside along a longitudinal direction in order to form the plurality of optical axes at intervals, the housing including a metal case and end members connected to both ends of the metal case; a cover that transmits light from a light projecting element, which is the one element, and is attached to the housing so as to cross the optical axe; an indicator lamp that is a light diffusing member disposed outside an outer surface of at least one of the cover and the housing along the longitudinal direction or formed in series with the cover; and an indicator lamp light source that is accommodated in the housing and supplies light for displaying toward the indicator lamp.

Abstract: Display with high visibility without impairing rigidity of a housing is performed. A light curtain includes: a housing in which one element of a pair of elements disposed inside along a longitudinal direction in order to form the plurality of optical axes at intervals, the housing including a metal case and end members connected to both ends of the metal case; a cover that transmits light from a light projecting element, which is the one element, and is attached to the housing so as to cross the optical axe; an indicator lamp that is a light diffusing member disposed outside an outer surface of at least one of the cover and the housing along the longitudinal direction or formed in series with the cover; and an indicator lamp light source that is accommodated in the housing and supplies light for displaying toward the indicator lamp.

Abstract: Provided are a diffusion plate that diffuses light emitted from a light source, and a prism having a first surface to receive the light transmitted through the diffusion plate, a second surface to reflect the light in contact with a measurement target liquid, and a third surface to extract the reflected light. The light source, the diffusion plate, a light receiving lens, and an imaging element are accommodated in a holder that presses the prism from the inner side to the outer side.

Abstract: To provide a clamp-on type ultrasonic flow sensor capable of calculating a flow rate of fluid flowing in a pipe. An elastic couplant 114 is supported on a pipe P by a clamp member 130 such that a pipe contact section T1 is in contact with the pipe P. The pipe contact section T1 is surrounded by a damping material 116 between the clamp member 130 and the pipe. An elastic couplant 124 is supported on the pipe by a clamp member 140 such that a pipe contact section T2 is in contact with the pipe. The pipe contact section T2 is surrounded by a damping material 126 between the clamp member 140 and the pipe. The clamp members 130 and 140 are coupled to each other to sandwich the pipe in a state in which the clamp members 130 and 140 respectively press the damping materials 116 and 126.

Abstract: To provide a clamp-on type ultrasonic flow sensor capable of calculating a flow rate of fluid flowing in a pipe. An elastic couplant 114 is supported on a pipe P by a clamp member 130 such that a pipe contact section T1 is in contact with the pipe P. The pipe contact section T1 is surrounded by a damping material 116 between the clamp member 130 and the pipe. An elastic couplant 124 is supported on the pipe by a clamp member 140 such that a pipe contact section T2 is in contact with the pipe. The pipe contact section T2 is surrounded by a damping material 126 between the clamp member 140 and the pipe. The clamp members 130 and 140 are coupled to each other to sandwich the pipe in a state in which the clamp members 130 and 140 respectively press the damping materials 116 and 126.