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Control Valve Accessories

Positioners

3731-3 - Explosion-Proof Electro-Pneumatic Positioner (HART)

Operation: Linear and Rotary (Independent of Fail-Safe Action or Moving Direction)

Travel/Rotation: Up to 300mm or 100o

Input: Single Multi-Turn Push Button

Display: Alphanumeric LCD with ability to rotate display 180o

Communications: HART and SAMSON TROVIS VIEW

Control: PD

Calibration & Tuning: Auto Calibration with Four Different Initialization Modes

The Type 3731-3 is the explosion proof enclosed full feature HART enabled electro-pneumatic positioner designed to work in general industrial applications. This positioner can work inherently with single-acting linear and rotary control valves as well as double-acting linear and rotary control valves with the addition of a reversing amplifier.  The digital benefits of the Type 3731-3 provide self-calibration and automatic adaptions to the valve and actuator being controlled via 4 initialization methods.  This digital positioner has preset parameters such that only values deviating from the standard need to be adjusted. With 50+ parameters and 30+ error codes, the majority of critical settings and information can be communicated.  The HMI (human machine interface) of the single multi-turn push button and LC-display allow this communication of information to occur right at the unit. The potentiometer-based travel sensor of the Type 3731-3 is not susceptible to wear often found in gear-based travel sensors.  The travel range of the Type 3731-3 can be restricted up to 1/5 maximum stroke as well as operated in split range. 

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Features & Benefits

  • Low steady state air consumption less than 0.06 scfm at all supply pressures
  • Tight-closing function
  • Set point range of 4 to 20mA and user define with at least 25% of entire stroke utilized.
  • Continuous monitoring of zero point
  • Output pressure limitation of various defined values.
  • Programmable limitations of the reference variable and travel range
  • 10 Define Characteristics plus one user defined (entered over operating software)
  • Programmable performance characteristics (i.e. PID control coefficients)
  • Aluminum housing.
  • Optional binary contact output, integrated solenoid valve, analog transmitter, and binary input.
  • Integrated diagnostics including device status and event messages, data logger, histograms (travel setpoint deviation, and cycle counter), drive signals diagrams (steady and hysteresis), end position trending, static characteristic test, partial stroke test, and full stroke test.
  • Up to SIL 3 capable device