White Knight Closed-Loop Controller

Automatically maintains system pressure or flow rate set points

White Knight CPC-1 Closed-Loop Controllers


The programmable closed-loop controller (CPC-1) automatically maintains system fluid pressure or flow rate in high-purity chemical processes and delivery systems. It monitors and controls pneumatic pumps and pump accessories to provide complete closed-loop systems.

Specification SheetOwner’s ManualOrdering InstructionsRequest Software
White Knight One-Year Warranty
CE Certification Mark

Features & Benefits

The CPC-1 monitors and controls pneumatic pump systems. It supports pressure control and flow control operation modes to manage the system using feedback from a pressure transducer (no delay) or a flow meter (two second signal delay), respectively. It also supports supply pressure control operation to manage the system without feedback control.

  • Automatically maintains system pressure or flow rate
  • Simple Plug-&-Play integration using standard protocols
  • Flow stability in pressure transitions that is independent of filter loading, viscosity, or temperature
  • Adjustable flow rate or pressure set point
  • Maintains line pressure in dead-head without continued cycling of the pump
  • Maintains delivery pressure as demand and line restrictions change
  • High temperature capability
  • Software interface simplifies setup
  • Real-time feedback for flow rate, supply pressure, line pressure, and temperature
  • Quickly switch between control modes
  • Customizable alarms for control limit, system limit, maintenance, and leak detection
  • Input and output communication through analog and digital signals
  • Compatible with shuttle-, fiber optic-, and proximity-driven bellows pumps
  • Supports parallel operation with multiple White Knight pumps

System Setups

The CPC-1 sends an analog signal to an electro-pnuematic proportional regulator. The regulator applies pressure to the pump. The pump pressurizes the fluid line causing flow. Sensors placed in the fluid line send analog signals to the CPC-1 to maintain the process. Simultaneously, the CPC-1 communicates to external alarms, PLC, or Windows-based computer, which allows the CPC-1 to integrate into various tool designs.


Setup controller using a Windows computer via a standard RS-232 communication protocol or a 10/100 Base-T Ethernet port. It supports automatic IP Address assignment over DHCP Network.

Power Requirements

  • CPC-1 power consumption 2.5 watts typical with maximum of 4 watts.
  • High-power sourcing outputs (12 –24 VDC, 500 mA)
  • Low-power outputs (5 –24 VDC, 25 mA)

Wiring Connections

Digital I/O Connections: 44 Pin HD D-Sub Connector

Digital Inputs Include:

  • Turn on pressure control
  • Turn on flow control
  • Turn on set supply air
  • Turn on set point change via Analog input
  • Leak sensor input
  • Reset leak sensor alarm
  • Proximity sensor input left
  • Proximity sensor input right

Digital Outputs Include:

  • Pressure control on
  • Flow control on
  • Supply air on
  • Alarm: Leak detected
  • Alarm: Out of control limits
  • Alarm: Near System Capacity
  • Solenoid: Left signal
  • Solenoid: Right signal

* Digital inputs are configurable to voltage reference high or low.
* Digital outputs are configurable to be voltage source or sink.
* Digital ports must be powered with an external source.

Analog I/O Connections: 26 Pin HD D-Sub Connector

Analog Inputs Include:

  • Flow meter signal
  • Pressure transducer signal
  • Temperature sensor
  • Desired set point

Analog Outputs Include:

  • Flow meter signal
  • Pressure transducer signal
  • Temperature signal
  • Air regulator signal

* Analog inputs can be configured to be 0-5 VDC, 0-10 VDC, or 4-20 mA.
* 4-20 mA output requires the optional White Knight signal converter.


Dimensions: in [mm]

CPC-1 Closed-Loop Controller Dimensions with Wire Connectors
Download CPC-1-W Dimensions (PDF)

Dimensions: in [mm]

CPC-1 Closed-Loop Controller Dimensions with Screw Terminals
Download CPC-1-S Dimensions (PDF)


Get QuoteLocate Distributors
White Knight Controller with Cable Connector

Digital I/O cable to wire leads

White Knight Controller with Screw Terminals

Breakout board to screw terminals

High-Purity Closed-Loop Pump Systems

Automatically maintain laminar flow or steady pressure. White Knight closed-loop systems feature metal-free pumps with PTFE and PFA flow paths. They provide stable temperatures, dead-head, and suction lift.

Control your high-purity chemical processes and delivery systems. Simplify process automation to save time, resources and reduce costs.

  • ≤ 140 lpm (36 gpm) flow rates
  • ≤ 7 Bar (100 psi) pressures
  • ≤ 210°C (410°F) temperatures
  • Maintain stable temperatures
  • No metals, no corrosion
  • No elastomer O-rings, no leaks
  • No electric motors, no heat rise
  • No impellers, no microbubbles
High-Purity Closed-Loop Systems