Pressure Controllers & Transducers


PCD–Series: Dual Valve Differential Pressure Controllers

PCD-Series Dual Valve Differential Pressure Controllers use two proportional valves to maintain differential pressure between any two points in processes flowing gases within dead-ended volumes.
  • Fast & accurate. Custom valve sizing and PID tuning ensure controllers reach pressure setpoints in milliseconds and maintain control with NIST-traceable accuracy to ±0.125% of full scale.
  • Efficient, versatile control. Maintain differential pressure between any two points or keep one port open to atmosphere and control gauge pressure, with readings displayed in your choice of engineering units. Additionally, the second proportional valve exhausts excess pressure only when needed to maintain your setpoint, eliminating the need to continuously bleed costly gas.
  • Easy integration. Custom process ports and electrical connectors, and your choice of EtherNet/IP, EtherCAT, DeviceNet, Profibus, Modbus (RTU and TCP/IP), or serial communications for easy integration into your industrial process.

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Accessories included with purchase

Device specs and customization options

Quick Specs
Differential PCD-Series performance (most products)
  • Available ranges: max –100 to +100 PSID; min –2 inH₂O to +2 inH₂O PSID
  • Steady state control range: 0.5% – 100% of full scale
  • Standard accuracy calibration, NIST-traceable: ±0.25% of full scale
  • Optional high-accuracy calibration, NIST-traceable: ±0.125% of full scale
  • Repeatability: 0.08% of full scale
  • Typical control response time: as fast as 100 ms
  • Warm-up time: <1 s
Differential PCD-Series operating conditions
  • Compatible gases: All non-corrosive gases
  • Operating temperature: –10°C to +60°C
  • Proof pressure: 150 PSIG
  • Burst pressure: 3x full scale
Device Ranges & Full Specs

Devices are custom ranged from 2 inH₂O full scale to 100 PSID full scale with controllable ranges of 0.5% to 100% of full scale.

Device Customization & Accessories

Device customization | Build and performance options

  • Communications protocols: analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS
  • Displays: monochrome or color; integrated or panel–mount
  • Process connections: NPT, SAE, AN, BSPP/G, welded compression, or VCR/VCO fittings
  • Elastomers: Viton, FFKM, EPDM, Silicone
  • Calibration: High-accuracy or custom
  • Performance: Integrated potentiometer control

Valve sizing and PID tuning | Valve options

Your pressure controller may be customized with one of the following valving options to ensure optimal performance under your expected process conditions.

  • PCD – small proportional control valves for flow ranges of 20 SLPM and below
  • PCD with PCA designation – high-performance proportional control valves used for applications with higher pressures
  • PCDP – small proportional control valves with the largest orifice (not available for corrosive configurations)
  • PCDH – hammerhead configuration, which pairs two small valves working side-by-side as one valve at each of the two valve positions
  • PCRD – nearly frictionless large Rolamite proportional valves for flow rates of 50 SLPM and above

Accessories | Sold separately

  • Process port fittings and filters
  • Power supplies
  • Communications cables and conversion cables
  • BB3 and BB9 multi-drop breakout boxes

Not exactly what you’re looking for?

  • Explore other dual valve pressure control options, including anti-corrosive and absolute/gauge pressure devices.
  • Check out our other pressure or flow control and measurement solutions.
  • Our expert team of applications engineers is available to provide additional information, discuss your application, or answer answer any questions you may have.

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