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Technical specifications for FBM202 P0926EQ
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Manufacturer:Invensys
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Product Category:DCS Systems
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Spare Part Number:FBM202 P0926EQ
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Estimated shipping dimensions:4.5x11x11.5cm
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Weight:0.3 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Thermocouple/mV inputs:8 isolated channels
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Reference-junction inputs:1 isolated RTD channel
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Input voltage range:-10.5 to +69.5 mV DC
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Raw-count mapping:0-64000 over the specified input range
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Full-scale input:71.419 mV = 65535 raw counts
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Millivolt accuracy at 25 °C:±0.03% of span (±27 µV)
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Differential input impedance:10 MΩ
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Accuracy temperature coefficient:±50 ppm/°C
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Reference sensor:4-wire Pt100; IEC 751 Class B
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RTD reference conformity:±0.25 °C
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Thermocouple conformity:±0.25 °C
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Reference-junction accuracy:±0.50 °C with the internal TA RTD
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Common-mode voltage limit:30 V AC or 60 V DC
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Dielectric withstand:600 V AC for 1 minute
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Open-circuit detection source:250 mV DC through 10 MΩ
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Input update capability:New readings every 25 ms
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Module Fieldbus:Redundant 2 Mbps
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Supply voltage:24 V DC; +5%, -10%
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Maximum consumption:3 W
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Operating temperature:-20 to +70 °C, module
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Storage temperature:-40 to +70 °C
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Relative humidity:5-95%, noncondensing
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Thermocouple types:B, E, J, K, N, R, S, T
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Termination cable:Type 2; up to 30 m
Information
Overview
Manuals
Common Applications
Product Precautions
Foxboro FBM202 P0926EQ places reference-junction sensing at the termination assembly, allowing the temperature-measurement path to account for the temperature at the field-wire connection.
- Separates every measurement channel galvanically from the other channels and ground.
- Uses an independent sigma-delta converter for each analog input.
- Supports configurable integration periods and rate-of-change limits.
- Reports an open thermocouple through an upscale burnout response.
A baseplate-mounted termination assembly serves two adjacent modules, while a DIN-rail termination assembly serves one module through a removable cable. This choice determines how field connections are arranged in the enclosure.
Important Notice: Confirm the thermocouple type and polarity at each field termination before comparing the indicated process temperature with the test source.
Foxboro FBM202 P0926EQ Manuals & Downloads
Foxboro FBM202 P0926EQ Manufacturer Technical Reference — Selected Pages (PDF)Foxboro FBM202 P0926EQ Installation & Commissioning Guide (PDF)The reference covers input ratings, termination options and cable selections; the field guide covers connection planning, commissioning and fault diagnosis.
Furnace temperature acquisition
Bring several thermocouple measurements into process monitoring while retaining separate isolated input circuits.
Low-level millivolt measurement
Acquire signals within the specified millivolt input range when the application supplies the appropriate scaling.
Remote termination cabinets
Place the DIN-rail TA near field wiring and connect it to the module baseplate with the appropriate Type 2 cable.
FBM02 subsystem upgrades
Retain suitable field termination arrangements when a planned 100 Series upgrade uses the FBM202 input function.
Prepare the measurement circuits and termination arrangement before working on Foxboro FBM202 P0926EQ.
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Keep sensor conductors paired and preserve thermocouple polarity at every junction.
2
Match each configured thermocouple characteristic to its connected sensor.
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Check the four-wire reference RTD connection before investigating a shared temperature offset.
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Keep common-mode potential within the input circuit limits.
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Choose termination assembly material for the actual enclosure temperature.
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Do not treat the reference RTD channel as an extra process thermocouple input.
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Confirm the selected Type 2 cable connects the correct baseplate and TA.
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Coordinate removal with process operations even when field wiring can remain connected.
Technical notes
The 600 V AC, one-minute insulation test is a dielectric withstand value. The permitted common-mode boundary is 30 V AC or 60 V DC; the input is not a hazardous-voltage measurement circuit.
FAQ View All FAQ
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How does FBM202 P0926EQ compensate for temperature at the thermocouple termination?An isolated four-wire, 100 Ω platinum RTD in the termination assembly measures the reference-junction temperature. The sensor is an IEC 751 Class B device and uses the module’s separate reference channel.
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Why can an open thermocouple drive an FBM202 P0926EQ reading upward?The module uses upscale thermocouple burnout detection. A full-upscale indication can therefore represent a broken sensor circuit rather than a real rise in process temperature.
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Which millivolt value corresponds to 64000 raw counts on FBM202 P0926EQ?The 64000-count point corresponds to +69.5 mV DC; the lower end, -10.5 mV DC, corresponds to zero counts. The complete 65535-count range is reached at 71.419 mV.
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Can the FBM202 P0926EQ integration period be adjusted to reduce line-frequency noise?Yes. Software configuration sets the integration period used to average the converted samples. This allows power-line and process noise rejection to be balanced against the required measurement response.
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Does FBM202 P0926EQ share one converter across all thermocouple channels?No. Each input has its own sigma-delta A/D converter, allowing the channels to be converted independently rather than relying on one shared input converter.
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What changes in the termination arrangement when two FBM202 P0926EQ modules use a baseplate-mounted TA?The assembly connects sixteen two-wire signals to the two modules in paired slots. It contains a separate reference RTD for each module; one DIN-rail TA instead connects eight input signals to one module.
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Will FBM202 P0926EQ continue communicating after one module-Fieldbus path fails?The module accepts either A or B of the redundant 2 Mbps Fieldbus. It continues through the active path when the other path fails or is switched at system level.
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Which temperature limit governs an FBM202 P0926EQ installation using a PVC termination assembly?The PVC termination assembly is limited to -20 to +50 °C, even though the module itself is rated for -20 to +70 °C. The installation must remain within the limits of every fitted component.
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