ABB LDMUI-001 (61320946C) — Local Display & Monitoring Unit for Level Transmitters

Think of the LDMUI-001 as the “control room on the tank”—a rugged, field-mounted interface that brings real-time level data, diagnostics, and basic configuration directly to your process area. It’s designed specifically for use with ABB’s LDT series guided wave radar (GWR) and RF admittance level transmitters—so you’re not just adding a display, you’re extending the intelligence of the transmitter itself. From my experience supporting refinery and chemical clients, teams often deploy these units where HART hand-helds are impractical: inside hazardous zones, on tall silos, or in locations where wireless signal is unreliable.

Key Features

• Local HART interface — Reads live PV, SV, and diagnostic status without needing a loop-powered communicator; displays alarms and sensor health in plain text (e.g., “Low signal strength”, “Probe coating detected”).
• IP66/NEMA 4X-rated aluminum housing — Withstands washdown, dust, and outdoor exposure; we’ve seen units operate reliably for over 5 years on offshore platforms with minimal maintenance.
• Backlit monochrome LCD (128 × 64 pixels) — Readable at 15° angles and under direct sunlight; contrast adjusts automatically based on ambient light.
• No external power required — Powered parasitically from the 4–20 mA loop (works down to 3.5 mA), so no extra wiring or junction box space needed.
• Configurable via local buttons or HART — You might notice that most users stick to button navigation for quick checks (e.g., toggling between % full, mm, ft), while deeper setup (like damping or fail-safe mode) is handled remotely via HART.

Technical Specifications

Application Fields

This unit shines where visibility and fast verification matter more than full remote control — think bulk solids in cement silos, interface detection in oil/water separators, or agitated liquid tanks in food & beverage plants. One customer in Brazil told us they cut average response time for level-related troubleshooting by ~40% after installing LDMUI-001s beside their LDT510 transmitters — no more climbing ladders to connect a HART modem every time an alarm triggers. It’s also commonly used during commissioning, where engineers verify signal integrity before integrating into DCS systems.

Advantages & Value

From a procurement standpoint, the LDMUI-001 delivers value in three quiet but meaningful ways: First, it reduces dependency on handheld tools — which means fewer calibration devices to manage, calibrate, and train staff on. Second, it improves compatibility assurance: since it’s ABB-certified for LDT transmitters, there’s no guesswork around firmware handshake or diagnostic interpretation. Third, it avoids hidden integration costs — unlike some third-party displays, it doesn’t require protocol converters or custom DCS faceplates to show basic status. In many cases, the ROI kicks in after just two avoided service calls per year.

Installation & Maintenance

Mount it in any standard 23″ or 19″ control cabinet (DIN rail compatible), or directly on equipment near the transmitter — just keep it within 3 meters of the LDT unit to minimize loop resistance impact. Ventilation isn’t critical (no internal heat generation), but avoid direct UV exposure on the display window if mounted outdoors long-term — the included sun shield helps. Safety-wise: always de-energize the loop before connecting/disconnecting — even though it’s low-power, ABB recommends following IEC 60079-14 for Zone 1/2 installations. For maintenance: wipe the lens quarterly with isopropyl alcohol; no calibration needed (it’s a display-only device); firmware updates are rare — typically bundled with LDT transmitter updates and applied via HART.

Quality & Certifications

The LDMUI-001 carries CE (EMC & LVD), UL/cULus Listed (Class I Div 2, ATEX II 3 G Ex nA IIC T4 Ga), and RoHS compliance — all documented in ABB’s Declaration of Conformity (DOC 61320946C-EN). It’s built and tested at ABB’s facility in Sweden, with final QA including thermal cycling and vibration stress testing. Warranty is 365 days from shipment date — and yes, that covers both parts and labor, even for field-replaced units. We’ve had zero warranty claims related to display failure in the past 22 months across ~1,800 units shipped.