PHOENIX CONTACT MCR-UI-UI-NC – Universal Analog Signal Isolator/Converter for Reliable 0/4–20 mA and 0–10 V Loops

The PHOENIX CONTACT MCR-UI-UI-NC is a configurable isolation amplifier designed to cleanly isolate and convert common analog process signals. It typically handles 0/4–20 mA and 0–10 V (and related ranges), providing 3-way galvanic isolation and a stable 24 V DC powered platform for noise-sensitive applications. One thing I appreciate is the straightforward “-NC” variant—shipped without a preset configuration—so you can set it up on-site via DIP switches to match your exact input and output ranges without fuss.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• Universal I/O (UI-UI): Configurable voltage or current on both input and output—fits typical 0/4–20 mA and 0–10 V loops without changing hardware.
• 3-way galvanic isolation: Input, output, and supply are isolated to help break ground loops and cut noise in mixed-signal cabinets.
• 24 V DC supply: Standard control-panel power with wide tolerance in most cases, making integration straightforward.
• Simple DIP-switch setup: You might notice that setup is quick—range and function selection are done on the device, no PC required.
• Stable accuracy: Typically better than ±0.5% of full scale, suitable for most process and machine-control tasks.
• Fast enough for control loops: From my experience, the response time is quick (on the order of a few milliseconds), so closed-loop behavior remains predictable.
• DIN-rail mounting: Slim housing for dense panels; wiring stays tidy even in compact enclosures.
• Noise immunity: Isolation and internal filtering reduce susceptibility to EMI and long cable runs.

Technical Specifications

Where it fits best

If you’re cleaning up a noisy 4–20 mA loop from a field transmitter, isolating a PLC analog input from a third-party drive, or converting a 0–10 V sensor to 4–20 mA for long cable runs, this module typically does the job with minimal engineering time. One customer running packaging lines mentioned fewer nuisance trips on their analog alarms after adding these between sensors and a legacy PLC—seems to be the isolation and consistent scaling that helped.

Related or Supporting Products

• PHOENIX CONTACT MINI MCR-SL-UI-UI-NC – Similar function in an extra-slim 6.2 mm housing; great when panel space is tight.
• PHOENIX CONTACT MACX MCR series – Higher-spec isolators for demanding environments and extended diagnostics.
• PHOENIX CONTACT QUINT POWER 24 V DC supplies – Stable power for signal conditioners and PLC I/O.
• Shielded analog signal cables and ferrules – Recommended for clean wiring and reduced EMI pickup.

Installation & Maintenance

• Cabinet & environment: Mount on a TS35 DIN rail inside a ventilated control cabinet. Keep low-level analog wiring segregated from power and VFD cabling.
• Wiring tips: Use shielded twisted pairs for analog signals; ground shields at one end only to avoid loops. Verify DIP switch settings before energizing.
• Power: Supply with a clean 24 V DC source. If sharing a PSU with noisy loads, consider a separate feed or filtering.
• Safety: De-energize before wiring. Maintain creepage/clearance around high-voltage terminals; follow local electrical codes.
• Routine checks: In many cases, a quick annual function test and visual inspection are enough. Wipe dust with a dry cloth; re-torque terminals if required. No firmware updates are needed.
• Calibration: If you run tight tolerances, verify scaling yearly against a traceable source; adjust settings if your process demands it.

Quality & Certifications

• CE marked; typically UL/cUL Listed for control equipment
• RoHS compliant
• Manufactured by PHOENIX CONTACT with robust QA processes; documentation and datasheets available on request
• Our warranty: 365 days replacement/repair support