In case of internal monitoring of: buildings, museums and laboratories; OTR suggests internal thermohygrometer.

The instrument works with a hygroscopic sensor which get back proportionally a Volt value proportional to the humidity.

How is it installed?                                                      

To instal humidity sensor: disassemble the sensor cylinder by loosening the grub screw and the retaining cylinder by loosening the two Phillips screws. Fix on the wall the U-bracket with the dowel provided and refit the fixing cylinder with the screws and the sensor body with the grub screw.