Honeywell MC-TAMR03 51309218-175 Low-Level Analog Input Multiplexer Field Termination Assembly

The Honeywell MC-TAMR03 51309218-175, also cataloged as the MU-TAMR03 Low-Level Analog Input Multiplexer FTA, operates as a dedicated hardware component for 32-channel RTD and low-level signal acquisition within Honeywell Experion PKS and TDC 3000 systems.

Hardware Specifications

Process Control & Channel Isolation

Engineers utilize the assembly to interface resistance temperature detectors and low-millivolt signals to the process manager architecture. The hardware features 1500 VAC RMS channel-to-channel isolation and integrated cold junction compensation (CJC) profiles for thermocouple runs. A 14-bit A/D converter samples all 32 channels sequentially at 32 samples per second, while 120 dB crosstalk rejection suppresses electrical interference in industrial cable trays.

Frequently Asked Questions

Q: How does the multiplexer handle line frequency interference in high-noise environments?

A: The onboard signal conditioning circuitry synchronizes its sampling clock to configurable 50 Hz or 60 Hz line frequencies, rejecting normal-mode power line hum before analog-to-digital conversion.

Q: What protection level does the board offer against excessive input voltage spikes?

A: Channel input stages withstand continuous normal-mode voltages between -1 V and +10 V without hardware damage, maintaining galvanic isolation up to +/-1500 VDC relative to cabinet frame ground.

Q: Can technicians connect mixed sensor types to a single multiplexer assembly?

A: Yes, system configuration allows individual channels to process different low-level source inputs, including 10, 100, or 120 ohm RTDs, millivolt sources, and standard thermocouple calibrations.

Field Installation Guidelines

Technicians mount the assembly onto standard enclosure rails using mounting hardware, ensuring firm frame contact for ground path continuity. Installers terminate sensor leads at designated terminal points, maintaining uniform conductor lengths across bridge circuits to prevent resistance unbalance.

To ensure measurement accuracy on low-millivolt runs, technicians route sensor wiring through dedicated low-level signal conduits separate from switched AC leads. Installers ground cable shield drains at the main cabinet ground bar while maintaining complete isolation at the field sensor end. Technicians verify that conformal coating remains intact across all board edge contacts to secure long-term environmental protection.