4-20mA Sensor (EC420)

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Model: EC420

Requires the eGauge Sensor Hub and eGauge model EG4xxx (Pro or Core), not compatible with older model units.

Only use straight-through RJ-11 cables to connect powered sensors to the Sensor Hub. Telephone systems generally use "reverse" style RJ-11 cables which are incompatible with the Sensor Hub. See this article for more information on verifying the correct RJ-11 wiring. Every Sensor Hub compatible sensor sold by eGauge Systems comes with a straight-through RJ-11 cable.

The eGauge 4-20mA Sensor is used in conjunction with the Sensor Hub and an EG4xxx model meter (Core or Pro) to read a 4-20mA current loop sensor such as pressure sensors, water level sensors, temperature probes, and other industrial sensors that output a 4-20mA current loop.

See our Sensors product introduction video here.

eGauge EC420 4-20mA Sensor



Full specs (data-sheet PDF)

CAD file (STEP format)

  • CTid Enabled (w/ auto-configure and locator LED)
  • Compatible with 4-20mA current loop sensors
  • -30 °C to 70 °C
  • Humidity range: Up to 80%
  • Extruded aluminum Case
  • 26 x 26 x 40 (mm), 1.02 x 1.02 x 1.57 (in.)
  • 7' RJ-11 cable for Sensor to Sensor Hub
  • 47 CFR Part 15, Subpart B – Unintentional Radiators, Class B for Home or
    Commercial use
  • US Patent # 10560763

Hardware included

  • 1x eGauge 4-20mA Sensor
  • 1x 3-pin input plug
  • 1x 7’ RJ-11 cable for connection to Sensor Hub

Assembly/installation information

  1. It is not advisable to extend the RJ11 leads from the Sensor to Sensor Hub. It is acceptable to use a longer RJ45 cable from the Sensor Hub to the eGauge.
  2. If RJ11 cable between Sensor and Sensor Hub must be extended, it is advisable to use twisted pair wires, such as a CAT5 cable with RJ11 plugs (most commonly used for DSL modems).
  3. If terminating own cables, both RJ11 and RJ45 cables should be straight-through cables, with the same color order on both ends.
  1. Install the sensors and Sensor Hub
  2. Configure the sensors

Additional Software Configuration

The EC420 will report and record the milliamp value as a decimal number. If desired, the mA value can be converted to a numerical format the eGauge supports using the slope intercept formula of y = mx + b where y is the formula register you create, and x is the register recording the raw EC420 value.

If a 4-20mA sensor is connected to the eGauge measuring a percentage value between 0% and 100%, the slope intercept formula would be 6.25x + -25:


Similarly, a temperature sensor that can read between -50 °C and 200 °C would have a formula of 15.63x + -112.5 and would be configured like this:


This assumes the minimum and maximum values of the sensor range start at 4mA and end at 20mA.



Typical Setup Overview