Phoenix ContactMCR-C-UI-UI-DCI-NCConfigurable Three-Way Isolation Amplifier, 1 Analog In / 1 Analog Out, Current or Voltage, 18-30 V DC, 17.5 mm DIN Rail

Product Description

What this part is

A Phoenix Contact MCR-C-UI-UI-DCI-NC signal conditioner, order number 2810939. It is a three-way isolation amplifier for analog process signals: one analog input, one analog output, with current or voltage selectable on both sides. Input, output and supply are all galvanically separated from one another. The unit mounts on DIN rail in a 17.5 mm wide housing.

Decoding the order code

In this designation MCR is the Phoenix Contact measurement and control range, C denotes the compact 17.5 mm housing, and the paired UI-UI states a universal input and a universal output — each configurable for either a current or a voltage signal. The DCI and NC elements belong to the article designation for this particular variant and are searchable as part of the full order code.

What these specs mean in practice

Analog loops pick up trouble when the transmitter and the receiving controller sit at different earth potentials. Current then flows in the signal return for reasons that have nothing to do with the measurement, and the reading shifts. A three-way isolator removes that path: input, output and supply share no galvanic connection, so the loop can only carry the intended signal. The same isolation protects a controller analog card from a fault on the field side.

Universal configuration on both sides means the module also does signal conversion. A 4 to 20 mA transmitter can drive a 0 to 10 V controller input, or the reverse, without a second device. That matters when integrating equipment of different vintages, where current and voltage conventions rarely agree. Isolation is derived from integrated DC/DC converters rather than a mains transformer, so the module runs from the same 24 V DC control supply as the rest of the cabinet.

Published specifications

Function: three-way isolation amplifier / signal conditioner for analog signals
Input channels: 1
Output channels: 1
Input type: configurable, current or voltage
Output type: configurable, current or voltage
Factory configuration: input 0–10 V, output 0–10 V
Supply voltage: 18–30 V DC
Isolation: three-way, input to output to supply, via integrated DC/DC converters
Status indication: green power LED
Housing dimensions: 17.5 x 99 x 114.5 mm
Mounting: DIN rail
Order number: 2810939

Quantity and configuration

Sold as 1 Pc — one signal conditioner module. The module is supplied without a power supply and without an end clamp.

Installation and setup notes

Input and output ranges are selected on the module before wiring, and the module ships in the 0 to 10 V in, 0 to 10 V out configuration. Auxiliary supply is 24 V DC nominal, and the green LED confirms that supply is present. The 17.5 mm width lets the module sit in a standard signal-conditioning row alongside terminal blocks.

Interchange guidance

Phoenix Contact names the MACX MCR-UI-UI-NC, order number 2811446, as the replacement article for this item, so that is the current-production equivalent for the same universal-in, universal-out isolation duty. The MCR-C-UI-UI-DCI without the NC element is a related variant in the same family. Modules with fixed rather than configurable ranges, and two-way rather than three-way isolation, are different parts and are not substitutions for this one.