Michelson type interferometer with an angle of incidence of 30°, in a sealed room with a dry atmosphere. The passage window is made of germanium deposited on a KBr crystal (KRS-5); for increasing the performance, a KBr passage window can be used, but only with controlled atmosphere <50% RH. Wavelength range: 7800 – 350 cm-1 ; operating conditions 15 – 30°C and humidity <70% RH
