Description
The FOXBORO FBM218 is a specialized 8-channel analog input module within the Foxboro I/A Series distributed control system, designed specifically for thermocouple temperature measurement applications. This advanced fieldbus module provides high-precision conversion of thermocouple signals to digital values with exceptional accuracy and reliability. The FOXBORO FBM218 supports all major thermocouple types including J, K, T, E, R, S, B, and N, with automatic cold junction compensation that ensures accurate temperature measurement regardless of ambient temperature variations. Each channel features individual signal conditioning, noise filtering, and advanced diagnostics that monitor sensor health and wiring integrity, providing comprehensive temperature monitoring capabilities for critical process applications.
Engineered for demanding industrial environments, the FOXBORO FBM218 incorporates high-resolution measurement circuitry and advanced algorithms that compensate for thermocouple non-linearities, delivering precise temperature readings across the entire measurement range. The module features isolated inputs that prevent ground loops and ensure signal integrity in electrically noisy environments. The FOXBORO FBM218 is designed with comprehensive diagnostic capabilities that detect open thermocouple conditions, short circuits, and out-of-range signals, enabling proactive maintenance and reducing process downtime. Its high channel density and flexible configuration make it ideal for applications where multiple temperature points need to be monitored with high accuracy and reliability, such as in furnace control, reactor monitoring, and critical process heating applications.

FBM218 FOXBORO
Technical
| Parameter Name | Parameter Value |
| Product Model | FBM218 |
| Manufacturer | FOXBORO (Emerson) |
| Product Type | 8-Channel Thermocouple Input Module |
| Input Channels | 8 individually isolated channels |
| Supported Types | J, K, T, E, R, S, B, N thermocouples |
| Measurement Range | Type dependent: -200°C to +1820°C |
| Resolution | 0.1°C (24-bit effective resolution) |
| Accuracy | ±0.5°C or ±0.1% of reading (whichever is greater) |
| Cold Junction Compensation | Automatic, with ±1°C accuracy |
| Update Rate | 500 ms per channel (all channels) |
| Input Impedance | >1MΩ |
| Common Mode Rejection | >120 dB at 50/60 Hz |
| Normal Mode Rejection | >80 dB at 50/60 Hz |
| Isolation | 500V AC channel-to-channel and field-to-system |
| Diagnostic Features | Open thermocouple detection, short circuit detection |
| Status Indication | Per-channel LED indicators |
| Power Supply | 5V DC from fieldbus (FBM bus) |
| Power Consumption | 2.8W typical |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Safety Standards | UL, cUL, ATEX, IECEx |
| EMC Compatibility | Meets IEC 61326 industrial requirements |
| Connection Type | Removable terminal block |
| MTBF | >450,000 hours per IEC 61709 |
Main Features and Advantages
The FOXBORO FBM218 offers several advanced features specifically designed for precision thermocouple measurement applications. Universal thermocouple support: The module accommodates all major thermocouple types, providing installation flexibility and compatibility with existing sensor infrastructures. High-accuracy measurement: With ±0.5°C accuracy and advanced cold junction compensation, the FOXBORO FBM218 ensures precise temperature monitoring for critical processes. Automatic linearization algorithms correct for thermocouple non-linearities across the entire temperature range, ensuring accurate readings without manual compensation calculations.
Advanced diagnostic capabilities include open thermocouple detection, short circuit identification, and out-of-range monitoring, enabling proactive maintenance and reducing process downtime. Individual channel isolation prevents cross-talk between measurement circuits and protects the system from field-side electrical faults. The FOXBORO FBM218 features excellent noise rejection characteristics, maintaining measurement accuracy even in electrically noisy environments. Software-based configuration allows easy setup of thermocouple type, measurement units, and alarm parameters without hardware modifications. The module also supports hot-swappable replacement when proper procedures are followed, minimizing process disruption during maintenance activities. These features combine to make the FOXBORO FBM218 an ideal solution for reliable and accurate temperature measurement in process automation systems.
Application Field
The FOXBORO FBM218 is extensively used in process industries where high-temperature monitoring is critical for process control, product quality, and equipment protection. In chemical and petrochemical plants, the module is employed for reactor temperature monitoring, furnace control, and high-temperature process measurements. The FOXBORO FBM218 is crucial in metals production for furnace temperature monitoring, heat treatment processes, and molten metal temperature measurement. In glass and ceramic manufacturing, the module serves critical functions for kiln temperature control, annealing processes, and quality control monitoring.
The power generation industry utilizes the FOXBORO FBM218 for boiler temperature monitoring, turbine exhaust temperature measurement, and combustion control applications. The module is also found in pharmaceutical manufacturing for sterilization process monitoring, dryer temperature control, and high-temperature reaction monitoring. In food processing, the FOXBORO FBM218 monitors baking temperatures, frying processes, and thermal processing operations. The module’s ability to handle high-temperature measurements and support various thermocouple types makes it particularly suitable for applications involving furnaces, heaters, reactors, and other high-temperature processes where reliable temperature monitoring is essential for safety, quality, and efficiency.

FBM218 FOXBORO
Related Products
FBM214: 4-channel thermocouple input module
FBM216: RTD input module
FBM206: 8-channel analog input module
FBM205: 4-channel analog input module
FBM217: Analog input module with HART support
FBM207: Analog output modules
CP270: Control processor for FBM modules
FBM231: High-density analog input module
FBM242: Digital output module



Email: sales@slxytech.com
WhatsApp / Wechat:8617062388866
Phone:+86 17062388866