Woodward LinkNet-HT RTD Module (8 RTD Inputs) 8200-1200

Woodward LinkNet-HT RTD Module (8 RTD Inputs)   8200-1200

The Woodward 8200-1200 is a high-density, distributed I/O module from the LinkNet-HT™ series.

Unlike the 505 or Peak150 series which are standalone turbine controllers, the 8200-1200 is an expansion module designed to provide temperature monitoring capabilities for complex control systems like the MicroNet™ or Peak200.

It specializes in resistance temperature detector (RTD) inputs, allowing the main controller to monitor bearing temperatures, winding temperatures, or process steam heat with high precision.

Technical Parameter Table

Product Advantages and Features

Distributed Architecture: Allows temperature sensors to be wired to a local module near the turbine, reducing the cost of long, expensive cable runs back to the main control room.

High Precision: 16-bit resolution ensures accurate temperature tracking, which is critical for identifying early signs of bearing wear or cooling system failure.

Ruggedized for Industry: Featuring Class G3 conformal coating, this module is built to withstand the “rotten egg” smell of H2S gas and other corrosive elements common in paper mills and refineries.

Hot-Swappable: Designed to be replaced while the system is energized (depending on the base system configuration), minimizing downtime during maintenance.

Smart Diagnostics: Automatically detects open circuits or shorted sensors, providing immediate feedback to the master controller to prevent false trips.

Unique Product Description

The Woodward 8200-1200 is the “sensory nervous system” for modern turbine setups.

While the main governor handles the muscle (actuators), the 8200-1200 acts as a specialized data-hub for heat.

Its unique value lies in its CANOpen-based LinkNet-HT architecture, which allows it to integrate seamlessly into a “daisy-chain” of other I/O modules.

This modularity means you only pay for the I/O you need, making it a highly scalable solution for everything from small pumps to massive utility-grade turbines.

Application Cases

Bearing Temperature Monitoring: Continuous tracking of turbine and generator bearing temperatures to prevent catastrophic mechanical failure.

Generator Stator Protection: Monitoring the temperature of the internal windings in synchronous generators.

Heat Exchanger Efficiency: Measuring inlet and outlet steam/water temperatures to calculate thermal efficiency.

Lube Oil Systems: Ensuring that the turbine’s oil remains within the specified viscosity range by monitoring the reservoir and supply lines.

Installation and Maintenance

Wiring: Use 3-wire RTDs to ensure lead-wire resistance compensation. Shielded cabling is mandatory for environments with high electromagnetic interference (EMI).

Network Termination: Since it uses CAN communication, ensure the LinkNet-HT network is properly terminated with a 120 $\Omega$ resistor at both ends of the trunk line.

Power: Ensure the 24V DC power supply is stable; a power-cycle on the module will temporarily drop all 8 temperature readings to the master controller.

Address Setting: Each 8200-1200 on a single CAN bus must have a unique node address, typically set via rotary switches or software configuration.

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