Honeywell MU-TAMR03 51309218-125 Low Level Analog Input Multiplexer RTD FTA

Description

Designed for seamless integration within legacy TDC 3000 and Experion safety or control architectures, this Honeywell MU-TAMR03 serves as a specialized Low Level Analog Multiplexer (LLMux) Field Termination Assembly (FTA) dedicated to RTD temperature sensor interfaces. Operating as a critical link between field-level RTDs and the Low Level Analog Input Multiplexer (LLMux) Input/Output Processor (IOP), this module enables high-density, millivolt-level temperature data acquisition. The assembly features robust compression terminals for point-to-point field wiring and is specifically engineered for non-redundant configurations in controlled control room environments.

Features

• High-Density Interface: Supports up to 16 independent low-level analog input channels for RTD measurement.
• Compression Terminal Blocks: Features secure, direct compression connections to accommodate standard field wiring without soldering or specialized lugs.
• Single IOP Architecture: Configured for non-redundant, single-channel interface systems, maximizing slot efficiency in standard loops.
• TDC 3000 Compatibility: Engineered to connect via standard Honeywell proprietary cabling directly to the LLMux IOP card.

Applications

• Power Generation: High-density temperature monitoring of bearing housing, stator windings, and exhaust gases.
• Refining and Petrochemicals: Multi-point RTD tracking on distillation columns and heat exchangers.
• Pulp and Paper: Multi-channel continuous thermal profiling in harsh drying sections.

Ordering Information

Technical Specifications

Connections and Interfaces

The MU-TAMR03 routes 3-wire RTD connections from the field directly to the LLMux multiplexing circuitry. Each of the 16 channels requires three dedicated termination points to ensure accurate lead-wire resistance compensation.

Empirical Engineering Insights

Alternative Models & Compatibility

The 51309218-125 (MU-TAMR03) belongs to the non-conformally coated class of TDC 3000 assemblies. For harsh or corrosive petrochemical installations, engineers must specify the MC-TAMR03 (51309218-175), which incorporates a protective conformal coating layer. Additionally, if your facility standardizes on screw-type termination barriers rather than compression clamps, the MU-TAMR13 variant should be deployed instead.

Application Pitfalls & Engineering Notes

Because this FTA is a non-redundant system, the loss of this module or its direct serial cable interface will cause the immediate drop of all 16 analog monitoring loops. Crucially, as an uncoated board, placing the MU-TAMR03 in an environment subject to condensing humidity or corrosive gases (such as hydrogen sulfide) will lead to early degradation of the analog multiplexing chips, resulting in erratic, drifting, or open-circuit RTD error statuses.

Commissioning & Wiring Tips

To maintain maximum accuracy, ensure all three wires of the RTD circuit have the identical physical resistance. Discrepancies in wire length or contact oxidation at the compression terminals will degrade the lead resistance compensation calculation inside the LLMux IOP. During commissioning, run high-quality shielded twisted-pair cables, and ensure the shield drain wire is terminated only at the designated FTA shield ground terminal to mitigate ground loop noise.

Installation Guidelines