The Valve-Tronic Plus™ electronic flow controller is designed for use in highly demanding industrial applications that require accurate flow control and measurement. It can function as a stand-alone controller for basic applications or become an integral part of a process control system for automatic flow control.

  • Large LCD display provides vital information such as actual flow rate, totalized flow, valve position, alarms, and diagnostic messages
  • Field programmable engineering units
  • Configurable to control based on rate of flow or valve position for applications where the Process Variable (PV) is Dew-point, Carbon Potential, etc.
  • Standard Modbus TCP for easy integration with control systems
  • Manual actuation of value possible
  • Easy to install
  • Ideal for customers who need to control and data log flow rates for compliance to NADCAP, AMS2750D, or CQI 9
  • Field calibration for null and span
  • Advanced polynomial calibration for high accuracy over the entire range of the meter
  • Built-in Web Server with remote access to device
  • Full PID setpoint control
  • Calibration in state-of-art ISO/IEC 17025:2005 accredited laboratory
  • Simple and intuitive programming menus
Power requirements: 500mA @ 24 VDC ±10%
Digital Input: 1 Input, 24 VDC (programmable)
Digital Output: 3 Outputs, 24 VDC, 1.0A max (programmable)
Setpoint Input Signal: Isolated 4-20mA
Flow/Totalized Output Signal: Isolated 4-20mA
Air (70°F; 14.7 PSIA / 21°C; 1 bar)
Model S: 4-100 CFH (0-3 m3/hr)
Model M: 10-1500 CFH (0-42 m3/hr)
Model L: 150-18,000 CFH (4-510 m3/hr)
Model SF: 0.2-25 GPH (0.75-95 l/hr)
Turndown Ratio:
Model S: 10:1
Model M: 12.5:1
Model L: 15:1
Accuracy: † VDE/VDI 3513 sh.2, qG=50%
Model S/SF: 5%
Model M: 4%
Model L: 3%
Max Operating Temperature
Ambient: 140°F (60°C)
Media: 200°F (93°C)
Max Pressure: 100 PSIG (7 bar)
Max Operating Pressure:
S/SF: 90 PSIG (6 bar)
Model M: 75, 90 PSIG (5, 6 bar)
Model L: 5, 10, 30, 75 PSIG (⅓, 0.7, 2, 5 bar)
Pressure Drop: ≤ 2” wcg (5 mbar)
Recommended Inlet Pressure: : ≥ 0.5 PSI; 14” W.C. (35 mbar)


  • Carburizing
  • Gas Blending
  • Neutral Hardening
  • Nitriding
  • Sintering



  • All gas types and mixtures
  • Liquids including water, alcohol, and methanol


* If you are unsure of the gas or liquid compatibility of your application, please contact your Waukee representative.