June 08, 2026

Emerson 406A036H01 WDPF 120 Nickel RTD Module Product Description

Emerson 406A036H01 is a high‑precision 120 Ω Nickel RTD (Resistance Temperature Detector) Input Module designed for the legacy Westinghouse WDPF Distributed Control System (DCS). It provides accurate, stable temperature measurement by interfacing with nickel‑based RTD sensors, converting resistance signals into digital data for process monitoring and control in critical industrial environments. Engineered for compatibility with WDPF racks, this module ensures reliable thermal measurement in power generation, petrochemical, and heavy industry applications where precise temperature tracking is essential.

Description

Emerson 406A036H01 WDPF 120 Nickel RTD Module Product Description

1. Product Overview

2. Basic Product Information

Model Number: 406A036H01
Manufacturer: Emerson Automation Solutions (formerly Westinghouse Process Control)
Product Type: WDPF DCS RTD Input Module
Sensor Type: 120 Ω Nickel RTD
Applicable Systems: Westinghouse WDPF DCS
Country of Origin: United States
Form Factor: Standard WDPF slide‑in card
Warranty: 12 months for new and factory‑refurbished units
Certifications: Emerson factory tested, CE, EMC compliant

3. Core Functions

The 406A036H01 module’s primary function is to receive and condition resistance signals from 120 Ω nickel RTD sensors, converting them into calibrated digital temperature values for the WDPF DCS controller. It supports multiple RTD input channels with high‑accuracy signal conditioning, including excitation current sourcing, noise filtering, and linearization for nickel RTD characteristics. The module provides galvanic isolation between field sensors and the DCS backplane to protect against electrical noise, ground loops, and voltage surges. It also includes built‑in diagnostics for sensor open/short circuits, over‑range conditions, and module faults, enabling real‑time health monitoring and rapid troubleshooting. Additionally, it communicates with the WDPF controller via the backplane bus, transmitting temperature data and receiving configuration commands.

4. Technical Specifications

4.1 Electrical & Measurement

Sensor Compatibility: 120 Ω Nickel RTD (α = 0.00618 Ω/Ω/°C)
Input Channels: Multi‑channel (WDPF standard configuration)
Excitation Current: Constant current source (calibrated for 120 Ω Ni RTD)
Temperature Range: -200 °C to +600 °C (sensor‑dependent)
Measurement Accuracy: ±0.1 °C (typical, at 25 °C)
Resolution: 0.01 °C
Isolation: 1500 VAC (field side to backplane)
Fault Detection: Open sensor, short circuit, over‑range, under‑range

4.2 Environmental

Operating Temperature: 0 °C to +55 °C
Storage Temperature: -25 °C to +70 °C
Relative Humidity: 5%–95% (non‑condensing)
Vibration: IEC 60068‑2‑6 compliant

4.3 Mechanical

Mounting: Slide‑in, front‑locking latch (WDPF rack compatible)
Conformal Coating: PCB coated for dust/moisture resistance
Dimensions: Standard WDPF module size

5. Compatibility

The 406A036H01 is designed exclusively for Westinghouse WDPF DCS racks, fitting into standard WDPF I/O slots. It integrates seamlessly with other WDPF modules, including controller cards, analog/digital I/O modules, and communication cards. As a legacy WDPF component, it supports existing installations requiring nickel RTD temperature measurement, serving as a reliable replacement for older WDPF RTD modules.

6. Industrial Applications

This module is deployed in mission‑critical industrial processes where accurate temperature monitoring is vital:

Power Generation: Thermal, combined‑cycle, and nuclear power plants (WDPF‑based)
Petrochemical: Refineries, gas processing, and chemical manufacturing
Heavy Industry: Pulp & paper, mining, cement, and metallurgical facilities
Process Manufacturing: Any WDPF‑controlled plant requiring nickel RTD temperature input

7. LED Indicator Descriptions

PWR (Green): On = Module power normal; Off = No power or fault
ACTIVE (Green): On = Module communicating with controller; Flashing = Data transfer
FAULT (Red): On = Sensor fault (open/short) or over‑range; Flashing = Module hardware error

8. Installation & Safety

Power Off: Disconnect cabinet AC before insertion/removal.
ESD Protection: Use anti‑static wristband/mat to avoid component damage.
Insertion: Align with rack slots; push until front latch clicks.
Wiring: Connect 120 Ω Ni RTD sensors per field wiring diagrams; torque terminals to specs.
Grounding: Connect module ground to cabinet earth (<1 Ω).
Power‑Up: Restore power; verify LEDs; confirm temperature readings in DCS.

9. Maintenance & Troubleshooting

Routine Checks: Quarterly inspection of LEDs, wiring, and connections; annual calibration verification.
Common Issues:
- FAULT Light On: Check RTD sensor for open/short; verify wiring.
- No Temperature Data: Ensure module is active; check backplane communication.
Calibration: Calibrate per Emerson guidelines using precision resistance standards.

10. Ordering Information

Part Number: 406A036H01
Category: DCS Spare Parts → WDPF System → Temperature Input Modules
Availability: New original and tested refurbished units (low supply)
Lead Time: 2–4 weeks (standard); rush repair available
Order Notes: Specify WDPF rack serial number and channel count for compatibility.

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