ETR: Desistive Output Interface


  • Small size, easy installation.
  • Universal inputs: 5 V,10 V and 4-20 mA.
  • Local Analog Override with indication.
  • Output Status Indicators (LEDs).
  • Large Power Dissipation (4 W @135 R).
  • Backup Controller Option (with remote activation).


  • Used to interface any resistance controlled device with a generic control system
  • Electric Actuator Control
  • Chiller Stage Control
  • Resistive Sensor Simulation
  • Any installation that requires an isolated potentiometric variable resistance

Product Description

The ETR accepts a generic Analog Output signal (voltage or current) and provides variable resistance output as a simulated potentiometer. The board performs 64 step approximation with about 1.5% output resolution. For high output accuracy the ETR's resistive array utilizes a number of 1% precision metal film resistors. Their unique configuration allows for over 4 Watts power dissipation.

The ETR is equipped with a Local Override feature that allows for manual output control. Output status is indicated by 6 LEDs in an easy to follow binary code. The input current loop, the Local Override mode and the processor status are also indicated by LEDs. As an option, the board may be equipped with a 'fail-safe' relay that will transfer the output to a backup controller when the power is lost or a processor malfunction is detected. Remote activation of this feature is also possible by a 10 VDC signal.

The board mounts in a 3.25" wide snap-track(provided) and is equipped with high quality angular connectors for fast and easy wiring.


Power24 VAC (or DC),100 mA
Input0-10 VDC , 0-5 VDC, 4-20 mA via dedicated connectors, automatically detected.
OutputPotentiometric Resistance; 64 Steps Standard 0-135 Ohm @ 4 Watts continuos. Contact ETI for other values.
IndicationLEDs for Output Status (in binary), Processor Status, Local Override, Input Current Loop.
DimensionsL= 4.62" (116 mm), W= 3.25" (82 mm)
Mounts in TR-3 snap-track (provided)

Ordering Information

ETR135: 135 Ohm, 4 Watts (standard)
ETRxxx: xxx designates desired resistance. (Contact Elkor for details).


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