The Pirani gauge AP2004 has been designed for vacuum measurements of gases in the pressure range of 1000 mbar to 5.10-4 mbar.It is an active gauge. It can be operated with an Adixen controller(ACS 2000 or ACM2000) or as a stand alone gauge sending a signal directly to other equipment.This gauge must not be used for measuring flammable or combustible gases which react in air.