Phoenix ContactPI-EX-NAM/RNO-NESingle-Channel NAMUR Isolating Amplifier, Ex ia Intrinsically Safe Input, Relay N/O Output, Line Fault Detection, SIL 2

Product Description

What this part is:

A Phoenix Contact PI-EX-NAM/RNO-NE intrinsically safe signal isolator, order number 2835341. It is a single-channel Ex i binary input module: a NAMUR proximity sensor or mechanical switch mounted in a hazardous area connects to the intrinsically safe input, and the resulting binary state is repeated as a relay contact in the safe area. The module provides galvanic three-way isolation between input, output and supply.

Hazardous-area certification:

Input circuit: Ex ia, marked ATEX II (1) GD [Ex ia] IIC, routable into Zone 0 while the module sits in the safe area or in Zone 2. Module body: II 3 G Ex nAC IIC T4 X, rated for Zone 2 installation. Functional Safety: SIL 2 in accordance with EN 61508. EMC: NAMUR recommendation NE 21.

What these specs mean in practice:

A NAMUR sensor signals its state by changing current draw rather than by switching a contact. Because the sensor always draws some current, the amplifier distinguishes four conditions: sensor active, sensor inactive, lead breakage and short circuit. A broken cable reports as a diagnosed fault rather than reading as an inactive sensor.

Galvanic three-way isolation separates the field circuit, the relay output and the supply from one another, so earth potential differences between the field and the control cabinet do not couple into the signal.

Specifications:

Function: NAMUR isolating amplifier, Ex i binary input. Channels: 1. Input: NAMUR proximity sensor or mechanical switch, intrinsically safe circuit. Input Circuit Voltage: 10.6 V maximum. Input Circuit Current: 33 mA maximum. Output: relay, N/O contact. Line Fault Detection: lead breakage and short circuit. Isolation: galvanic three-way, input to output to supply. Supply Voltage: 24 V DC. Order Number: 2835341.

Mounting data:

Mounting Type: DIN rail, plug-in module on the PI-EX-ES-1/3 basic terminal block, which carries the field and supply wiring. Connector Style: screw terminal blocks. No configuration switches are required for NAMUR input operation.

Quantity and configuration:

Unit Quantity: 1 Pc. The PI-EX-ES-1/3 basic terminal block (order number 2835325) and the TT-PI-EX-TB surge protection device (order number 2858386) are separate accessories.

Interchange guidance:

The PI-EX-NAM/RNO (order number 2835053) is a related device in the same family with NAMUR input and relay output. The MACX MCR-EX-SL-NAM-R (order number 2865434) is a Phoenix Contact NAMUR isolating switch amplifier in the MACX form factor, with a different footprint and terminal arrangement.