MC-TAMR04 51305907-175 Honeywell UCN Low Level Analog Input Multiplexer

Product Description

Configured for low-level thermocouple signal multiplexing in Honeywell UCN-based TPS/Experion PKS architectures, the Honeywell 51305907-175, also cataloged as the MC-TAMR04 Low Level Analog Input Multiplexer, provides direct physical/electrical execution of microvolt-range sensor acquisition and channel switching.

Hardware Specifications

Cold Junction Compensation and Thermocouple Signal Conditioning

The module executes cold junction compensation (CJC) locally at the terminal block reference using an onboard precision temperature sensor, then offsets the raw thermocouple EMF against the CJC value before 24-bit conversion. Channel-to-channel isolation is maintained through galvanic barrier structure between the LLMUX FTA TC SLD ST.CC front-end and the UCN backplane, suppressing ground-loop injection from field wiring. Input scanning follows a sequential multiplexer schedule driven by the UCN controller; each thermocouple channel is sampled with auto-zero correction to cancel offset drift across the 0 to 60 deg C cabinet range.

Frequently Asked Questions

Q: Does the MC-TAMR04 support hot-swap replacement on a live UCN I/O link without controller restart?

A: No. The module must be de-energized at the cabinet power supply before extraction. Live removal disrupts the UCN node token and forces a re-scan cycle on the associated controller redundant pair.

Q: What is the backplane current draw contributed by one MC-TAMR04 at 5 VDC and 24 VDC rails?

A: Typical 15 W load distributes as approximately 1.2 A at 12 VDC internal conversion input from the cabinet power supply; no direct 5 VDC backplane current is drawn because the ADC and CJC subsystems are locally regulated from the 12 VDC intermediate rail.

Q: Can Type-K and Type-J thermocouples be mixed on the same MC-TAMR04 physical module?

A: Yes, per-channel linearization table selection is software-assigned in the DCS database. However, the CJC reference is shared per FTA block, so mixed types are allowed only if all connected probes share the same terminal block ambient environment.

Field Installation Guidelines

Mount the module into the designated UCN I/O carrier slot with the cabinet power isolated. Seat the LLMUX FTA TC SLD ST.CC terminal assembly first, then insert the MC-TAMR04 until the guide rails lock. Ground the shield drain wire of each thermocouple cable to the DCS cabinet ground bus at the single-point shield termination strip; do not tie shield to terminal block signal common. Keep thermocouple extension wires away from 120 VAC and 24 VDC solenoid wiring by minimum 150 mm separation or metal partition. Verify CJC accuracy by shorting one spare channel input to the CJC reference screw and confirming sub-2 μV offset after 30 min cabinet stabilization at 25 deg C.

Other Attributes

• Series: Honeywell C200 C300
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

In Stock Hot Items of Honeywell

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