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Technical specifications for AD908AC FBM202
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Manufacturer:Invensys
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Product Category:DCS Systems
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Spare Part Number:AD908AC FBM202
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Estimated shipping dimensions:10.2×4.5×10.4 cm
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Weight:0.28 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Thermocouple channels:8 isolated thermocouple/mV inputs
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Reference channel:1 isolated RTD reference-junction compensation channel
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Sensor types:B, E, J, K, N, R, S and T thermocouples
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Fault detection:Upscale thermocouple burnout detection
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Fieldbus:Redundant 2 Mbps module fieldbus
Information
Overview
Manuals
Common Applications
Product Precautions
Foxboro AD908AC FBM202 provides the integrated field-termination path for the FBM202 thermocouple and millivolt input subsystem, including reference-junction temperature sensing.
- Provides eight measurement channels plus one reference channel for the documented integrated thermocouple termination function.
- Handles thermocouple or millivolt input through the specified Foxboro FBM module-fieldbus path.
- Works with FBM202 thermocouple/mV input path and its terminal-temperature reference.
- Galvanic isolation is provided for the thermocouple inputs and the reference channel.
The integrated thermocouple termination belongs in the controlled Foxboro FBM module-fieldbus path and works with FBM202 thermocouple/mV input path and its terminal-temperature reference. Its field connection, companion hardware and project configuration must be reviewed together before the channel is returned to service.
Important Notice: Use AD908AC FBM202 only with FBM202 thermocouple/mV input path and its terminal-temperature reference; verify the field interface and controlled configuration before energizing the subsystem.
Foxboro AD908AC FBM202 Manuals & Downloads
Foxboro AD908AC FBM202 Official Technical Reference Excerpt (PDF)Foxboro AD908AC FBM202 Installation & Commissioning Guide (PDF)
The first document covers the product function, system role and technical selection. The installation guide covers identification, connection checks, commissioning and the acceptance record.
Installed-base maintenance
Restores the documented integrated thermocouple termination position without changing the approved system architecture.
Loop or channel service
Supports verification of thermocouple or millivolt input at the assigned control-system channel.
Planned replacement
Provides an exact-identity replacement path when FBM202 thermocouple/mV input path and its terminal-temperature reference and the field interface have been confirmed.
Commissioning support
Allows the responsible engineer to prove wiring, configuration, status and response for eight measurement channels plus one reference channel.
Before installing Foxboro AD908AC FBM202, confirm the documented system, interfaces and controlled configuration.
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Match the complete AD908AC FBM202 marking to the work order and installed position before removal.
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Confirm FBM202 thermocouple/mV input path and its terminal-temperature reference before making or breaking any field connection.
3
Keep the assigned thermocouple or millivolt input within the documented subsystem and range.
4
Record terminal designations, polarity, common and shield treatment before disconnecting conductors.
5
Inspect module seating, connector keying, terminal condition and strain relief before power is restored.
6
Restore the controlled channel configuration, range selection and alarm or timeout behavior after installation.
7
Check local indicators and controller diagnostics for internal, communication or channel faults during commissioning.
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Prove the intended response across eight measurement channels plus one reference channel and record the acceptance result before release.
Technical notes
Use AD908AC FBM202 only with FBM202 thermocouple/mV input path and its terminal-temperature reference; verify the field interface and controlled configuration before energizing the subsystem.
FAQ View All FAQ
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Which thermocouple types are supported by Foxboro AD908AC FBM202?The documented input set covers B, E, J, K, N, R, S and T thermocouples.
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How is cold-junction compensation handled in Foxboro AD908AC FBM202?An isolated RTD reference channel measures terminal temperature for reference-junction compensation alongside the eight thermocouple/mV inputs.
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What channel structure does Foxboro AD908AC FBM202 provide?The subsystem has eight isolated measurement channels plus one isolated reference-junction RTD channel.
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How does Foxboro AD908AC FBM202 indicate an open thermocouple?Its documented burnout function drives an affected thermocouple reading upscale so the failure can be distinguished from a normal process value.
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May millivolt sources be connected to Foxboro AD908AC FBM202?Yes. The FBM202 path accepts millivolt signals as well as the supported thermocouple types, provided the channel configuration matches the source.
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What wiring detail is critical for the Foxboro AD908AC FBM202 reference channel?The RTD reference sensor must remain associated with the correct integrated termination so terminal-temperature compensation represents the connected thermocouples.
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Through which communications path does Foxboro AD908AC FBM202 report temperature values?Converted measurements and status are transferred over the redundant 2 Mbps module fieldbus.
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What should commissioning prove on Foxboro AD908AC FBM202 before temperature loops are accepted?Commissioning should confirm the configured thermocouple type, polarity, reference-junction response and upscale burnout behavior for each used channel.
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