PD420-461 4-20 mA Set Point Generator and Valve Positioner

Brand: Precision Digital Corporation

The PD420/21 set point generator and the PD460/61 valve positioner provide a convenient way to generate a 4-20 mA signal that can be used to control another device.

Both feature a backlit LCD.

The PD420/21 set point generator can be programmed to display 0-100%, 4-20 mA or 3-21 mA and output either 4-20 mA or 3-21 mA.

The PD460/61 valve positioner is programmed to display a value of 0-100% relating to the 4-20 mA output.

A built-in dial is provided to vary the displayed / output value.

The dial may be programmed for coarse or fine adjustment.

The signal generator and valve positioner are both available as a panel mount or NEMA 4X version.

In addition, NEMA 4X enclosures are provided to house up to three of the panel mount versions.

Decals are provided for %, mA, Open, and Closed for the user to apply to the faceplate.

There is also a decal with a white background for the user to write a custom label.
  • 4-20 mA Loop Set Point Generator
  • Panel Mount or NEMA 4X
  • 4-20 mA or 3-21 mA Output Ranges
  • Set Point Displayed as 0-100%, 4-20 mA, or 3-21 mA
  • Valve Position Displayed as 0-100%
  • Built-in Dial for Changing Output
  • Backlit Display
  • Coarse or Fine Set Point Adjustment
  • ± 0.5% Output Accuracy
  • 0.01 Display Accuracy
  • 15-30 VDC Power Requirement
  • < 500 ohms Sampling Resistance
  • Decals Provided for %, mA, Open, Closed, and Custom


Output Accuracy

  • ± 0.5 %

Output Ranges

  • 4-20 mA or 3-21 mA


  • 0.3” - 8 mm High Backlit LCD

Display Accuracy

  • 0.01

Display Modes

  • Current
  • 0-100 %
  • 0-50.0 Hz

Display Change Adjustment

  • User may program coarse and fine adjustments such that each pulse on the dial results in a change of between 1 and 50 counts on the display

Front Panel

  • NEMA 1: PD420 and PD460


  • NEMA 4X: PD421 and PD461


  • 2 Each
  • %, mA, Open, Closed, and white background for the user to write a custom label

Operating Temperature Range

  • -4° to 140° F
  • -20° to 60° C


  • Removable Screw Terminal Block

Power Requirement

  • 15-30 Vdc

Sampling Resistance

  • Less than 500 Ω


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