The AD908AC is a dedicated connection cable compatible with the FBM202 thermocouple/millivolt input interface module. As a key accessory component of the FOXBORO I/A Series DCS system, it is primarily designed for signal transmission and connection between the FBM202 module and field thermocouple sensors, terminal blocks, or related equipment. It ensures stable transmission of signals across 8 thermocouple/millivolt input channels and 1 isolated RTD reference junction compensation channel, while also being compatible with the module features such as hot-swapping and redundant operation. Widely used in industrial automation control scenarios with stringent requirements for temperature measurement accuracy and system reliability—including power, chemical, and pharmaceutical industries—it serves as a critical link guaranteeing the FBM202 module’s precise acquisition of on-site temperature data.
Technical Specifications
Compatible Module and System
Signal Transmission Characteristics
- Transmitted Signal Types: Compatible with thermocouple signals (e.g., standard types such as K, J, T, E) and millivolt-level signals (-10.5 to +69.5 mV DC), while also capable of transmitting temperature detection signals from the RTD reference junction compensation channel.
- Anti-interference Capability: Adopts a shielded design with strong resistance to electromagnetic interference (EMI) and radio frequency interference (RFI). It reduces the impact of complex electromagnetic environments in industrial sites on signal transmission and ensures data acquisition accuracy. The transmission accuracy of millivolt inputs can meet the module’s precision requirement of ±0.03% of the full scale.
- Transmission Distance: Standard lengths are available in 1m, 2m, 3m, etc. (customizable), meeting the requirements of different installation distances in industrial sites. It features low signal transmission attenuation, ensuring stable and accurate signal transmission even over long distances.
Physical and Electrical Characteristics
- Dimensions and Weight: It fits the installation space of the FBM202 module, with a cable outer diameter complying with industrial wiring specifications. Lightweight and easy for on-site routing and installation, its overall dimensions are compatible with the module’s installation specification of 24×19.8×5.5 cm, with a weight of approximately 0.46 kg (including matching connectors).
- Connector Type: Equipped with dedicated connectors that match the input ports of the FBM202 module and field terminal blocks. It ensures secure connection and low contact resistance, and incorporates an anti-misplug design to prevent damage to the module or sensors caused by wiring errors.
- Insulation and Protection: The insulating material complies with industrial safety standards such as UL/CSA, providing excellent insulation performance. Its protection level is suitable for industrial field environments, capable of resisting the impact of dust, moisture, etc., and extending service life.
- Certification and Compliance: It has passed the official FOXBORO quality certification and complies with relevant electrical safety standards in the industrial automation field, such as CE certification. It is compatible with industrial installation specifications in different countries and regions, ensuring safety and compliance during use.
Product Features and Advantages
- High Compatibility and Adaptability: Custom-built for the FBM202 module, it enables seamless connection between the module and field devices without additional adapters. It is compatible with the module’s functions such as channel isolation and thermocouple burnout detection, ensuring the full performance of the module.
- Stable and Accurate Signal Transmission: The shielding layer design effectively reduces signal interference, ensuring the precise transmission of thermocouple and millivolt signals. It helps the FBM202 module achieve high-precision temperature acquisition, providing reliable data support for the execution of control algorithms such as PID regulation and interlock logic.
- Industrial-grade Durability: Made of high-quality cable materials that are wear-resistant, oil-resistant, and anti-aging, it adapts to harsh industrial environments such as high and low temperatures (typically -40℃ to +85℃) and vibrations. It features a long service life and reduces the frequency of maintenance and replacement.
Easy Installation: The locking structure of plugs and sockets is secure, allowing for easy installation and disassembly. It is compatible with the hot-swapping feature of the FBM202 module, enabling quick connection and disconnection of the cable during module maintenance or replacement without affecting the normal operation of other modules.
Application Scenarios and Precautions
Typical Applications: It is commonly used in temperature monitoring links of continuous production industries such as oil refining, power generation, and chemical engineering—including the acquisition of critical parameters like reactor temperature, pipeline temperature, and heating furnace temperature. Through the collaboration of the FBM202 module and this cable, on-site temperature signals are transmitted to the DCS system, providing data support for production process control and safety interlocking.- Installation and Operation Precautions
- Keep the cable away from high-voltage cables, frequency converters, and other strong interference sources during routing to avoid electromagnetic interference with signals.
- Operate in strict accordance with the wiring specifications of the module and cable to ensure secure connector connections, preventing signal loss or acquisition anomalies caused by poor contact.
- Regularly inspect the cable’s appearance and connection status; replace it promptly if damage or aging is detected to ensure stable system operation.
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