Title: 36 Siemens GDB181-MO.pdf.pdf
6.1.2 Calculation formulasThe parameters are based on the following formulas:Vn =300 ΔpnPa Pa300 Pa is the upper limit of the operating range of the differential pressure sensor. The nominal pressure is the differential pressure in the VAV box at a given nominal volume flow, determined by the OEM specification, cf. also section 3.Vmin[ ]%=min. nom.volume volumeflow flow[ [] ]/h3m/h3m×100[ ]%Vmax[ ]%=max. nom.volume volumeflow flow[ [/h3m/h3m] ]×100[ ]%Actualvalue[ ]%=Setpoint[ ] ( × 100%V max [ ] %Vmin)[ ]%+Vmin[ ]%FLW[ ]%= f( ) p =D100[ ]%×Vn×p D [ 300] [ ]PaPaDp[Pa]=f( FLW)=300[ ]Pa×æ ç èFLW 100 ×[ ] Vn%ö ÷ ø2VAV Compact Controller Modbus RTUA6V10631862_en--_d 2019-09-13Areas of useFunctionalityDesignSiemens Smart Infrastructure6.2 Configuration and maintenance tools