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    Pressure Controllers & Transducers

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    PCD–Series: Dual Valve Absolute and Gauge Pressure Controllers

    PCD-Series Dual Valve Absolute and Gauge Pressure Controllers use two proportional valves to precisely control the absolute or gauge pressure of gases within closed or 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 absolute or gauge pressure immediately upon powering up, 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.

    Request a quote

    Accessories included with purchase

    Device specs and customization options

    Quick Specs
    Absolute/gauge PCD-Series performance
    • Available full scale ranges:
      • Absolute: max 0–3000 PSIA; min 0–15 PSIA
      • Gauge: max 0–3000 PSIG; min 0–5 PSIG*
    • Steady state control range: 0.01% – 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 30 ms
    • Warm-up time: <1 s

    *Negative gauge pressure readings (to –15 PSIG) can also be included in gauge ranges.

    Absolute/gauge PCD-Series operating conditions
    • Compatible gases: All non-corrosive gases
    • Operating temperature: –10°C to +60°C
    • Burst pressure: 3x full scale (1.5x full scale for 500 to 3000 PSI devices)
    Device Ranges & Full Specs

    Gauge devices are custom ranged from 0.07 PSID (2 inH₂O) full scale to 3,000 PSIG full scale, and absolute devices are custom ranged from 15 PSIA full scale to 3,000 PSIA full scale. All devices have a controllable range of 0.01% to 100% of full scale.

    For a comprehensive device guide, read the dual valve pressure controller operating manual.

    Device Features
    Included with each device
    • User changeable units of measurement: Change the unit of measurement for pressure from our extensive list of engineering units.
    • Monochrome backlit LCD with integrated touchpad: Easily read measurements using the backlit display and control configurations with the user-friendly integrated touchpad.
    • User adjustable setpoint ramping & limits: Configurable ramp rates allow the process variable to be controlled as fast or as slow as desired, and configurable setpoint limits protect processes from inadvertent setpoint changes.
    • Valve close override and valve open override: Utilize alarms to quickly vent your system or stop all flow as needed.
    Request at time of purchase | Additional cost
    • Optional integrated potentiometer control: Use the integrated potentiometer to adjust setpoints with the simple turn of a knob.
    Device Customization Options
    Build and performance options
    • Communication protocols: Analog, RS–232, RS–485, DeviceNet, EtherCAT, EtherNet/IP, Modbus RTU or TCP/IP, PROFIBUS
    • Displays: Backlit monochrome or color; integrated or panel–mount
    • Process connections: NPT, SAE, AN, BSPP/G, compression, VCR, or VCO fittings
    • Elastomers: Viton, FFKM, EPDM, Silicone
    • Calibration: High-accuracy; custom calibration points
    Visit the device customization page
    Valve options & PID tuning

    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 below 20 SLPM
    • 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 20 SLPM and above

    Custom PID valve tuning ensures maximum performance for your specific process conditions.

    Learn about valve sizing and PID tuning options
    Optional Accessories
    Accessories | Sold separately
    • Process port fittings and filters
    • Power supplies
    • Communications cables and conversion cables
    • BB3 and BB9 multi-drop breakout boxes
    Visit the accessories page

    Not exactly what you’re looking for?

    Contact an applications engineer

    Learn about diverse pressure control applications in our knowledge base
    An Alicat pressure controller, 50 SCCM full scale, with a digital screen and standard valve, model PC-5PSIG-D, photographed by Alicat

    Ask Alicat: How do you control pressure in a closed system?
    Learn More
    BrochureManualPCD-Series device specs
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