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Honeywell MC-TAMT04 51305890-175 Thermocouple Input Terminal Board

The Honeywell MC-TAMT04 51305890-175, also cataloged as the MC-TAMT04 Thermocouple Input Terminal Board, operates as a dedicated low-level analog input interface for thermocouple signal acquisition within Honeywell TDC 3000 control system platforms.

Hardware Specifications

Parameter	Specification
Model	MC-TAMT04 51305890-175
Brand	Honeywell
Product Type	Thermocouple Input Terminal Board
System Platform	Honeywell TDC 3000 DCS
Origin	USA
Weight	0.85 kg
Dimensions	30.5 x 11.9 x 7 cm estimated shipping size
Input Type	Low-level analog thermocouple and millivolt inputs
Input Channels	64 fully isolated channels
Channel Configuration	16 channel increments
Nominal Input Range	-20 to +100 mV
Channel Bandwidth	0 to 4.7 Hz (-3 dB)
Gain Error	0.050% full scale maximum
TC and Millivolt Input Temperature Drift	+/-20 ppm per deg C maximum
RTD Input Temperature Drift	+/-20 ppm per deg C maximum
Common Mode Voltage	+/-250 VDC or VAC RMS with respect to power system common, DC to 60 Hz
Crosstalk Suppression	80 dB at DC to 60 Hz, 120 dB at 50 Hz and 60 Hz
Normal Mode Rejection Ratio	60 dB minimum at 50 Hz and 60 Hz
TC Linearization Accuracy	+/-0.05 ohm / deg C
Isolation Type	Channel-to-channel, channel-to-PM, and channel-to-power supply common isolation
Cold Junction Compensation	Remote cold junction capability

Cold Junction Compensation and Channel Isolation

The MC-TAMT04 provides thermocouple signal conditioning with remote cold junction capability for temperature measurement applications. Furthermore, the board implements 64 fully isolated input channels to reduce electrical interaction between field signals, processor interfaces, and power supply common points.

The isolated channel architecture supports low-level millivolt measurement by controlling common mode voltage effects and reducing signal interference. The module provides 80 dB crosstalk suppression across DC to 60 Hz conditions and increases rejection performance to 120 dB at 50 Hz and 60 Hz operation.

For Honeywell DCS instrumentation, thermocouple interfaces require accurate cold junction compensation (CJC) and stable analog conversion performance. The MC-TAMT04 applies these functions directly at the termination level before process data transfer to the controller subsystem.

Frequently Asked Questions

Q: Does the MC-TAMT04 support direct thermocouple input connection?
A: Yes. The module accepts low-level thermocouple and millivolt signals with a nominal input range of -20 to +100 mV.

Q: How does the MC-TAMT04 handle field signal interference?
A: The board uses channel-to-channel isolation, channel-to-PM isolation, and channel-to-power supply common isolation to reduce interference between input circuits.

Q: Does the MC-TAMT04 provide cold junction compensation?
A: Yes. The terminal board supports remote cold junction capability for thermocouple measurement applications.

Field Installation Guidelines

• Install the MC-TAMT04 in the designated Honeywell TDC 3000 I/O termination assembly location.
• Verify thermocouple polarity before connecting field wiring to prevent incorrect temperature measurement.
• Use shielded thermocouple cables where required by the field environment.
• Connect cable shields according to the plant grounding design to reduce electromagnetic interference.
• Separate low-level thermocouple wiring from high-voltage power cables and switching circuits.
• Confirm terminal connections and isolation points before applying field power.
• Follow Honeywell system documentation for module addressing, I/O configuration, and controller database setup.

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