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Premier Control Technologies Flow, pressure, level and temperature solutions

Alicat PCD - Dual Valve Differential Pressure Controller

  • Available for gauge and absolute pressures up to 3000 PSI / 207 Bar
  • Differential pressures up to 100 PSI / 7 Bar
  • 50-100 ms speed of response stills upstream fluctuations
  • Dual valve for standard closed volume applications
  • Up to ±0.125% of full scale accuracy

Fast-responding pressure, vacuum or differential control for closed volumes

Alicat PCD series allow for stable and response control within closed volumes, they reduce wasting costly gases as there is no continuous bleed valve. PCD series incorporates a second, independently controlled exhaust valve that actuates only when the pressure needs to be reduced, minimising the amount of gas venting.

The PCD series Alicat dual valve pressure controller is repeatable and accurate with calibrations up to +/- 0.125% of full scale accuracy. Every PC series controller has a 1/8” NPT female connection and are typically suited to low flow pressure applications.

Every Alicat pressure controller has a 200:1 turndown ratio with many standard pressure ranges available, standard pressure units include PSIA, PSIG, mmHG, inHG, inH2O, mBar, Atm, Torr and kPa.

The digital pressure controller features a local LCD screen and push button user interface to change process variables. A colour TFT display is also an option to. RS-232 communications are standard as well as an analogue output signal such as 0-5Vdc. Modbus-RTU, available over RS-232 or RS-485 and PROFIBUS protocols are also available.

Every Alicat device is backed by the manufacturers limited life time warranty and ships with a NIST traceable calibration certificate.

Ask Alicat: How do you control pressure in a closed system?


Common process applications and industrial uses include:

  • High-Efficiency Helium Leak Testing
  • Stable control of pressures in closed systems without continuous gas bleeding.
  • Fluid Dispensing
  • Extrusion Processes
  • Micro Fluidics
  • Burst Pressure Testing
  • Fuel Cell Testing

Other features

  • Optional ATEX Zone 2 Area Classification, permits operation in hazardous environments. (Ex nA IIC, T4 Tamb. -40°C ≤ Ta ≤ +50°C).
  • 9-pin or 15-pin D-sub connectors, configured to match any existing pinout.
  • Accessible PID valve tuning for best speed and stability.
  • Custom valve orifice sizing yields full-range stability.
  • Read our article we've written on PCD-Series Dual-Valve Pressure Controllers

Model numbers

  • PCD-15PSIG-D
  • PCD-30PSIG-D
  • PCD-100PSIG-D
  • PCD-500PSIG-D
  • PCD-100TORRA-D
  • PCD-1000TORRA-D
  • PCD-15PSIA-D
  • PCD-30PSIA-D
  • PCD-100PSIA-D
  • PCD-500PSIA-D
  • PCD-15PSID-D
  • PCD-30PSID-D
  • PCD-100PSID-D
  • PCD-15PSIG-D-PCAxx
  • PCD-30PSIG-D-PCAxx
  • PCD-100PSIG-D-PCAxx
  • PCD-500PSIG-D-PCAxx
  • PCD-1000PSIG-D-PCAxx
  • PCD-1500PSIG-D-PCAxx
  • PCD-2000PSIG-D-PCAxx
  • PCD-3000PSIG-D-PCAxx
  • PCD-100TORRA-D-PCAxx
  • PCD-1000TORRA-D-PCAxx
  • PCD-15PSIA-D-PCAxx
  • PCD-30PSIA-D-PCAxx
  • PCD-100PSIA-D-PCAxx
  • PCD-500PSIA-D-PCAxx
  • PCD-1000PSIA-D-PCAxx
  • PCD-1500PSIA-D-PCAxx
  • PCD-2000PSIA-D-PCAxx
  • PCD-3000PSIA-D-PCAxx


The Alicat PCD - Dual Valve Differential Pressure Controller is widely used in the following industries:

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