thermopile sensors / quads
quads – htsq-series, hgsq-series
the htsq multichannel sensors comprise four independent sensor chips for a multichannel gas concentration measurement. typically one to three of the optical channels contain a gas specific filter window and the other channel, equipped with a filter with center wavelength where no gas absorption occurs, serves as reference. of course we can also provide multichannel sensors with customer filters (thickness should be close to 0.5 mm). these sensors are offered in to-39 packages.