ATEX volumetric flow controller PPs-EL VPEX
Fields of application
for supply and return air systems
for hazardous areas of zones 1, 2, 21 and 22
also for explosion group llC in zones 1 and 2 (gases)
with air contaminated with aggressive media
Control components with protection index IP 66
for constant (CAV) or variable (VAV) systems
for positive control Vmin, Vmid, Vmax, “OPEN” or “CLOSED”
for volumetric flow and linear pressure control
Measuring range: 0…300 Pa
at ambient temperatures 0 °C to 20 °C…+50 °C, requirement: measuring air 0…+50°C/5…95% rH, non-condensing
with command signal 0…10V DC, 2…10V DC,
with supply voltage 24V AC / DC +/- 15%, 50/60Hz
for regulating the air velocity in the duct in the range of 2…13 m/s
can also be used with vertical axis
The round volumetric flow controller type VPEX made of plastic PPs-EL is suitable for use with aggressive components of polluted air and in areas subject to explosion hazards. The SCHAKO VPEX has been approved for all gases in zone 1, zone 2, as well as for dusts in zones 21 and 22. The SCHAKO VPEX can also be used in zones 1 and 2 of the explosion group IIC.
A volumetric flow controller is used for pressure-independent volumetric flow regulation in ventilation and air-conditioning systems. It serves to keep the volumetric flow either constant within specified limits (CAV) or to control it variably (VAV).
Housing, measuring sensor, control flap, PID controller with pressure sensor and actuator form a closed control loop with feedback, allowing demand-dependent, energy-saving air conditioning of single rooms or areas of air-conditioning systems. When suitable electrical controller types are used, room or duct pressure regulation can be achieved.
Since the membrane zero point must not be changed in static sensors, the mounting instructions documented by the manufacturer must be adhered to. The volumetric flow controllers type VPEX are not suitable for air containing sticky and greasy particles (e.g. kitchen exhaust air).