The TPS 534 thermopile sensor in TO 5 type housing employs a chip of 1.2 x 1.2 mm² absorber size and a 30 kV thermistor as temperature reference. The round window opening is equipped with a 5.5 µm longpass (standard) infrared filter. The sensor shows a flat sensitivity characteristics over the wavelength.

► Large absorber size - high signal output
► Low temperature coefficient of sensitivity
► Thermistor temperature reference included
► Applications in pyrometers, and - with additional infrared bandpass filters - in gas detectors