Thermistor temperature reference included Low temperature coefficient of sensitivity Applications: ear thermometers and pyrometers The TPS 434 thermopile sensor in TO 5 type housing employs a chip of 0.5 x 0.5 mm2 absorber size and a 30 kV thermistor as temperature reference. The round window opening is equipped with a 5.5 mm longpass (standard) infrared filter. The sensor shows a flat sensitivity characteristic over the wavelength. The TPS 434 can be equipped with a G9 (8...14 m) filter for precision pyrometers ( TPS 434 G9). Parameters