Pressure controller

Pressure regulators

“ Accuracy : < +/- 0.25% full scale Max flow : 30 SCFM (850 SLPM) ”

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Presentation

Pressure controller QB3 from PROPORTION AIR

The QB3 is a closed loop pressure regulator consisting of two solenoid valves, internal pressure transducer, and electronic controls mounted to an integrated mechanical regulator.

The pressure is controlled by activating the solenoid valves, which apply pressure to the pilot of the mechanical regulator. One valve functions as inlet control, the other as exhaust. The unit output pressure is measured by a pressure transducer, which is internally mounted to sense pressure in the work port of the QB3 and provides a transduced feedback signal to the electronic control circuit.

This feedback signal is compared to the command signal. Differences between the command signal and the actual pressure feedback signal causes one of the solenoid valves to open to adjust the pressure in the pilot of the booster/regulator. Pilot pressure is adjusted so that desired down stream operating pressure is achieved and maintained. Because the working pressure is sensed as opposed to pilot pressure, hysteresis in the integrated mechanical regulator is eliminated.

The output pressure is proportional to an electrical command signal. Command inputs are either a differential 0-10 VDC or 4-20 mA. The unit comes standard with an electrical monitor signal for tracking pressure which comes from the internal pressure transducer.

The uniqueness of the booster design is that it has no stamped gaskets or special molded diaphragm or seal parts. All of the parts related to normal maintenance are standard O-rings.

Technical features

Accuracy : < +/- 0.25% full scale Max flow : 30 SCFM (850 SLPM) Pressure ranges : Full vacuum to 150 psig (760mmHg to 10,3 bar) Command signal : 0-10 VDC or 4-20mA Supply voltage 15-24 VDC Operating temperature: 32 to 158 °F = 0 to 70°C Port size :1/4 Protection rating : NEMA 4 / IP65 Linearity / hysteresis : < +/- 0.3 % full scale 40 µm filter included

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