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4256A64G01 / 3A99163G01 G50 Emerson Ovation WDPF DCS High Precision RTD Temperature Acquisition Board

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4256A64G01 / 3A99163G01 G50 Emerson Ovation WDPF DCS High Precision RTD Temperature Acquisition Board
June 10, 2026

4256A64G01 / 3A99163G01 G50 Emerson Ovation WDPF DCS High Precision RTD Temperature Acquisition Board

4256A64G01 is the legacy Westinghouse drawing part number, 3A99163G01 is Emerson’s official aftermarket spare part number, and G50 stands for the hardware revision version. All identifiers correspond to the identical high-precision RTD temperature acquisition board, which is designed to work with 4256A25 series MRC main remote control boards and 4256A26 remote expansion boards for Ovation WDPF DCS remote I/O racks.

Description

This module is dedicated to acquiring resistance temperature detector signals such as PT100 and PT1000 from industrial field equipment. It implements signal filtering, constant current excitation, galvanic isolation and built-in temperature conversion algorithms, transmitting high-accuracy digital temperature data to the DCS main controller. The board supports 2-wire, 3-wire and 4-wire RTD wiring modes with automatic lead resistance compensation to eliminate measurement errors caused by long-distance field cables. Each channel adopts fully independent isolation circuits to avoid signal crosstalk among different temperature measurement loops. It features plug-and-play compatibility with all matched MRC master and expansion boards, requiring no modification of system configuration during replacement.
Constructed with multi-layer high-temperature resistant FR-4 industrial PCB and full enclosed electromagnetic shielding structure, every signal channel provides 1000V AC/DC galvanic isolation between field wiring terminals and internal logic circuits. It effectively resists severe electromagnetic noise generated by inverters, high-voltage switchgears and large rotating machinery in thermal power, petrochemical and metallurgical heavy industrial environments. Each unit undergoes comprehensive factory validation: 72-hour high-low temperature cyclic aging test, full-channel temperature precision calibration, long-term full-load bus communication burn-in and channel open/short circuit fault simulation. It supports single-slot hot-swappable installation without shutting down the entire DCS system, and integrates multi-level hardware protections including surge suppression, overvoltage, overcurrent, reverse polarity prevention and short-circuit protection. Independent LED diagnostic indicators clearly display power supply status, bus link state and single-channel sensor fault alarms for fast on-site troubleshooting, greatly enhancing the accuracy and long-term operational stability of industrial process temperature monitoring.

Technical Specifications

  1. PCB Substrate: Multi-layer high heat-resistant FR-4 industrial printed circuit board

  2. Operating Temperature Range: -25℃ ~ +75℃

  3. Storage Humidity: 5% ~ 90% RH, non-condensing

  4. EMC Compliance: Industrial Class II, CE & LVD certified, compliant with EN 61000 series anti-interference standards

  5. Communication Bus: Dedicated MRC Link bus for Ovation remote I/O racks

  6. Channel Isolation Withstand Voltage: 1000V AC/DC galvanic isolation per independent channel

  7. Supported Sensors: PT100, PT1000 RTD; compatible with 2/3/4-wire wiring with lead resistance compensation

  8. On-board Integrated Protections: Surge suppression, overvoltage protection, overcurrent protection, reverse polarity protection, short-circuit protection

  9. Installation Mode: Single-slot hot-swappable plug-in module for standard Ovation DCS rack backplane

  10. Quality Warranty: Genuine original Emerson/Westinghouse product, equipped with independent factory inspection test report, 12-month official warranty

Application Fields

Medium and super-large thermal power plant Ovation WDPF distributed control systems, multi-unit integrated petrochemical process temperature acquisition cabinets, full-process furnace and pipeline temperature monitoring stations for metallurgical plants, multi-station automatic control systems of large municipal wastewater treatment plants, whole-plant equipment temperature signal acquisition racks for pulp & paper factories, multi-rack redundant central control rooms of traditional heavy industry, temperature parameter remote monitoring automation platforms for energy & chemical continuous production lines, centralized DCS monitoring control systems for large-scale distributed energy storage power stations
4256A64G013A99163G01G50

Title: 4256A64G01 / 3A99163G01 G50 Emerson Ovation WDPF DCS High Precision RTD Temperature Acquisition Board

Product Introduction

4256A64G01 is the legacy Westinghouse original part number, 3A99163G01 is Emerson’s unified aftermarket spare part number, and G50 indicates the hardware revision version. All three identifiers refer to the same high-precision RTD temperature acquisition board, which works cooperatively with 4256A25 series MRC main remote control boards and 4256A26 remote expansion boards for Ovation WDPF DCS remote I/O racks.
This module is specially developed to collect on-site RTD signals including PT100 and PT1000. It completes signal filtering, constant current excitation, galvanic isolation and built-in temperature conversion computation, and transmits high-precision digital temperature data to the DCS main controller. It supports 2-wire, 3-wire and 4-wire RTD wiring methods, with built-in lead resistance compensation algorithm to eliminate measurement errors induced by long field cables. Each channel adopts an independent isolation circuit to avoid signal crosstalk between different temperature measuring points. The card is fully plug-and-play compatible with all matching MRC master boards and remote expansion boards, and no system configuration adjustment is needed during replacement.
The circuit board is made of multi-layer high-temperature resistant FR-4 industrial PCB with fully enclosed electromagnetic shielding layout. Each signal channel is designed with 1000V AC/DC galvanic isolation between field wiring terminals and internal logic circuits, which effectively suppresses strong electromagnetic interference generated by inverters, high-voltage switchgears and large rotating equipment in thermal power, petrochemical and metallurgical heavy industrial sites. Every finished board passes strict full-process factory tests, including 72-hour high-low temperature cyclic aging test, full-channel temperature accuracy calibration, long-term full-load bus communication burn-in test and channel open/short-circuit fault simulation test. It supports single-slot hot-swappable installation without shutting down the whole DCS system, and integrates multi-level hardware protections such as surge suppression, overvoltage protection, overcurrent protection, reverse polarity protection and short-circuit protection. Independent LED diagnostic indicators display power supply status, bus link status and single-channel sensor fault alarms for rapid on-site troubleshooting, significantly improving the accuracy and long-term running stability of industrial process temperature monitoring.

Technical Specifications

  1. PCB Substrate: Multi-layer high heat-resistant FR-4 industrial printed circuit board

  2. Operating Temperature Range: -25℃ ~ +75℃

  3. Storage Humidity: 5% ~ 90% RH, non-condensing

  4. EMC Compliance: Industrial Class II, CE & LVD certified, compliant with EN 61000 series anti-interference standards

  5. Communication Bus: Dedicated MRC Link bus for Ovation remote I/O racks

  6. Channel Isolation Withstand Voltage: 1000V AC/DC galvanic isolation for each independent channel

  7. Supported Sensors: PT100, PT1000 RTD; compatible with 2/3/4-wire wiring with lead resistance compensation

  8. On-board Integrated Protections: Surge suppression, overvoltage protection, overcurrent protection, reverse polarity protection, short-circuit protection

  9. Installation Mode: Single-slot hot-swappable plug-in module for standard Ovation DCS rack backplane

  10. Quality Warranty: Genuine original Emerson/Westinghouse product, equipped with independent factory inspection test report, 12-month official warranty

Application Fields

Medium and super-large thermal power plant Ovation WDPF distributed control systems, multi-unit integrated petrochemical process temperature acquisition cabinets, full-process furnace and pipeline temperature monitoring stations for metallurgical factories, multi-station automatic control systems of large municipal wastewater treatment plants, whole-plant equipment temperature signal acquisition racks for pulp & paper factories, multi-rack redundant central control rooms of traditional heavy industry, temperature parameter remote monitoring automation platforms for energy & chemical continuous production lines, centralized DCS monitoring control systems for large-scale distributed energy storage power stations


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