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    PCDS–Series: Anti-Corrosive Dual Valve Differential Pressure Controllers

    PCDS-Series Anti-Corrosive Dual Valve Differential Pressure Controllers use two proportional valves to maintain differential pressure between any two points in processes flowing corrosive gases within dead-ended volumes.
    • Aggressive gas compatibility. Wetted materials compatible with many pure corrosive gases and most refrigerant gases, in addition to all non-corrosive gases and a variety of liquids.
    • 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.

    Request a quote

    Accessories included with purchase

    Device specs and customization options

    Quick Specs
    Differential PCDS-Series performance (most products)
    • Available full scale ranges: 5 PSID to 500 PSID
    • 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
    Differential PCD-Series operating conditions
    • Compatible gases: All non-corrosive gases, select corrosive gases, and chemically compatible liquids
    • Operating temperature: –10°C to +60°C
    • Maximum common mode pressure:
      • ≤ 100 PSID models: 200 PSIG
      • 500 PSID models: 750 PSIG
    • Burst pressure: 3x full scale
    Device Ranges & Full Specs

    Devices are custom ranged from 5 PSID full scale to 500 PSID full scale with controllable ranges 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 units of measurement 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
    • Wetted materials: 316L stainless steel; FFKM standard, FKM, or EPDM as needed for some gases
    • Calibration: High-accuracy; bidirectional; 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
    • 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

    Note: Certain gases (including SO2, and Cl2) require PCD with PCA designation.

    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
    Differential pressure controller for closed volumes (PCD-PSID) by Alicat Scientific. Note the dual pressure sense ports on the front.

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