It is the suction unit, it requires 1 unit FHSD8300 (Head End Module without screen) or FHSD8310 (Standard Head End Module with TFT screen), for 1 to 8 units of FHSD8330, communicated through RS485, up to 250 m of pipe can be connected sampling per module that draws in air from the protected area, analyzes it and determines if a pre-alarm or alarm should be activated. Particle sensitivity range 0.003 to 10 Microns. Measurement range (% Obs / m) 0.0015 to 25%. Four alarm levels (Aux, Pre-alarm, Alarm and Alarm 2). Number of sampling points, Up to 20 - Class A, Up to 40 - Class B, Up to 50 - Class C. According to PipeCaD calculation program. Inlet size 25 0 27 MM. It requires a 24V (950 mA) power supply. Dimensions: 110.5 x 113.5 x 300 mm. Certificates: CE and CPR (EN54-20).