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The WOODWARD 8200-1201 is a critical component in industrial control systems, specifically designed for accurate temperature measurement. It is an 8-Channel Thermocouple Input Module with a notable “Fail high” characteristic.
1. SEO-Optimized Titles:
- WOODWARD 8200-1201: 8-Channel Thermocouple Input Module (LinkNet-HT).
- WOODWARD 8200-1201: Fail-High Temperature Sensor Interface for Turbines.
- WOODWARD 8200-1201: Woodward LinkNet-HT TC Input with Fail-High Function.
- WOODWARD 8200-1201: Industrial Thermocouple Measurement Module.
- WOODWARD 8200-1201: Distributed I/O Module for Critical Temperature Monitoring.
2. Product Overview:
The WOODWARD 8200-1201 is a specialized Thermocouple (TC) Input Module providing eight independent channels for connecting thermocouple sensors. It’s part of Woodward’s LinkNet-HT (High-Temperature) series of distributed I/O modules, which means it’s designed for use in harsh industrial environments and communicates over a robust network. The “Fail high” feature is a crucial safety characteristic, indicating the module’s behavior in the event of a sensor or channel failure.
- Product Type: Thermocouple Input Module
- Manufacturer: Woodward
- Series: LinkNet-HT (High-Temperature)
- Channels: 8 Thermocouple Input Channels
- Key Feature: “Fail high” fault response
- Function: Measures temperature from thermocouple sensors and transmits data to the control system, providing a predictable fault state.
3. Detailed Product Description:
The WOODWARD 8200-1201 is engineered for precise and reliable temperature measurement, particularly in applications where thermocouples are the preferred sensor type due to their wide temperature range and robust nature.
Here’s a breakdown of its features and role:
- 8 Thermocouple Input Channels: The module can connect to eight individual thermocouple sensors. Thermocouples (such as Type J, K, T, E, N, R, S, B, etc.) generate a small voltage proportional to the temperature difference between two dissimilar metals. The module accurately measures these small voltages and converts them into precise temperature readings.
- “Fail high” Characteristic: This is a critical safety feature. In the event of an open circuit (e.g., a broken thermocouple wire) or a channel failure, the module’s output for that channel will “fail high.” This means the reported temperature will go to its maximum possible value, indicating an over-temperature condition to the control system. This is a common and often preferred fail-safe design, as an apparent high temperature can trigger a protective shutdown or alarm, preventing potential damage that might occur if a failed sensor reported a falsely low or normal temperature.
- LinkNet-HT Compatibility: The module communicates over Woodward’s LinkNet-HT protocol. This is a high-speed, robust, and distributed I/O network designed for industrial environments, allowing these modules to be placed closer to the temperature sensors. This reduces long wiring runs, minimizes noise pickup, and simplifies installation. LinkNet-HT nodes are also designed to operate reliably in high-temperature and high-vibration environments.
- High Accuracy and Isolation: Thermocouple measurements require precise cold-junction compensation (CJC) and high accuracy to convert the mV signal to a meaningful temperature. The 8200-1201 incorporates the necessary circuitry for this. It typically also provides electrical isolation between channels and from the system, preventing ground loops and ensuring signal integrity in noisy industrial settings.
- Integration with Control Systems: This module expands the temperature monitoring capabilities of compatible Woodward controllers (like the 505XT, or MicroNet systems via a gateway). The accurate temperature data is then utilized by the control system for:
- Process Control: Maintaining desired operating temperatures for efficiency and product quality.
- Protective Functions: Critically important for triggering alarms or protective shutdowns if temperatures exceed safe operating limits, such as exhaust gas over-temperature (EGT) in gas turbines or bearing over-temperature.
- Performance Monitoring: Tracking the thermal performance and health of machinery.
The 8200-1201 (LinkNet-HT) is distinct from the 8200-1101 (RTCnet) which also features 8-channel TC input with fail high, and the 8200-1151 which is a high-accuracy version of the 8200-1101, specifically recommended for gas turbine EGT monitoring.
4. Technical Specifications (General, as precise details can vary slightly by manual version):
5. Typical Applications:
The WOODWARD 8200-1201 is essential in applications where precise and fail-safe temperature monitoring from thermocouples is critical for the operation, protection, and safety of industrial machinery:
- Gas and Steam Turbines: Widely used for monitoring critical temperatures such as exhaust gas temperatures (EGT), bearing temperatures, and internal component temperatures. The “fail high” feature is particularly important for EGT monitoring, as a high temperature can indicate a combustion issue, potentially preventing significant damage.
- Engines: Monitoring engine cylinder temperatures, exhaust temperatures, and turbocharger temperatures.
- Furnaces and Kilns: Providing precise temperature feedback for control loops in high-temperature industrial processes.
- Chemical and Petrochemical Plants: Monitoring process temperatures in reactors, heaters, and other critical process equipment where high temperatures are common.
- Boilers: Measuring flue gas temperatures, steam temperatures, and other critical points.
