Description
Product Description
The Foxboro FBM202 (P0926EQ) is an 8-channel thermocouple and millivolt (mV) analog input module tailored for the Foxboro I/A Series Distributed Control System (DCS). It delivers precise temperature measurements by accepting a wide variety of standard thermocouple types (J, K, T, etc.) and low-level mV signals. Each input channel is galvanically isolated, ensuring high noise immunity and preventing interference between channels.
A dedicated isolated RTD reference junction channel provides accurate cold-junction compensation for thermocouple inputs, enhancing overall measurement reliability. The module employs high-accuracy sigma-delta A/D conversion, making it ideal for critical temperature-monitoring applications in oil refining, chemical processing, power generation, and other industrial sectors requiring precise thermal control.
The FBM202 supports both baseplate and DIN-rail termination assemblies, and its rugged design withstands harsh environmental conditions. The module is hot-swappable and field-replaceable, allowing seamless maintenance without disrupting system operation.
Technical Specifications – FBM202 / P0926EQ
| Parameter | Specification |
|---|---|
| Model | FBM202 |
| Part Number | P0926EQ |
| Module Type | 8-Channel Thermocouple/mV Input |
| Input Types | Standard thermocouples (J, K, T, etc.), Millivolt signals |
| Reference Junction | 1 isolated RTD channel for cold-junction compensation |
| Number of Channels | 8 isolated inputs |
| Input Range | –10.5 mV to +69.5 mV (thermocouple span dependent) |
| Accuracy | ±0.03% to ±0.1% of span |
| Update Rate | 25 ms reading; ~100 ms module update |
| Input Impedance | ≥10 MΩ differential |
| Power Supply | 24 VDC |
| Power Consumption | 3–5 W typical |
| Operating Temperature | –20 °C to +60 °C (some versions up to +70 °C) |
| Storage Temperature | –40 °C to +85 °C |
| Protection | IP20 |
| EMI/Noise Immunity | Suitable for Class G3 harsh industrial environments |
| Mounting | FBM200-series baseplate or DIN-rail termination |
| Dimensions | 200 × 107 × 32 mm |
| Weight | 0.45 kg |
Key Features
8 fully isolated thermocouple/mV input channels
Dedicated isolated RTD reference junction for cold-junction compensation
High-accuracy sigma-delta A/D conversion
Galvanic isolation per channel for superior noise immunity
Rugged construction for extreme industrial environments
Supports DIN-rail or baseplate mounting
Thermocouple burnout detection (upscale) for safety monitoring
Applications
Industrial process temperature monitoring
Chemical reactor temperature control
Power plant turbine or boiler temperature sensing
Thermocouple-based instrumentation and signal acquisition
Engineering Advantages
Reliable operation under high EMI and harsh conditions
Hot-swappable design for uninterrupted system operation
Seamless integration into Foxboro I/A Series DCS
Flexible deployment across baseplate or DIN-rail termination assemblies
FAQ
Q: Can FBM202 / P0926EQ measure multiple thermocouple types simultaneously?
A: Yes, each channel supports standard thermocouple types independently.
Q: How is cold-junction compensation handled?
A: A dedicated isolated RTD reference junction channel provides precise compensation.
Q: What is the maximum ambient temperature for operation?
A: Standard operating temperature is up to +60 °C, with some versions rated to +70 °C.
Features
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