Foxboro FBM203B 0‑640Ω RTD Resistance Temperature Detector Input Fieldbus Module

Technical Specifications

Model:FBM203B

Brand:Foxboro

System compatibility:I/A Series DCS legacy FBM fieldbus I/O subsystem

Function:8‑channel galvanically isolated RTD temperature input fieldbus module,acquires wide‑range resistance signals from field‑side platinum,nickel and copper RTD temperature sensors,sigma‑delta A/D conversion,configurable integration time and rate‑of‑change limit parameters,supports 2‑wire and 3‑wire RTD connection modes,0‑640Ω measuring range for higher‑resistance RTD applications

Installation:Baseplate‑mount installation,mated with dedicated FBM baseplate and matching termination assembly

Input channel:8‑channel RTD resistance input,0‑640Ω measuring range,channel‑to‑channel galvanic isolation,max 50Ω lead resistance per channel

Circuit feature:Sigma‑delta high‑precision A/D conversion,per‑channel over‑voltage protection,sensor open‑circuit detection,0.10mA nominal sensor excitation current

Feature:Support hot‑swap online replacement without subsystem power‑off,redundant 2Mbps fieldbus communication with FCP/FCM controller

Diagnostic:Front‑panel multi‑color LED indicators for power and fieldbus communication status

Power supply:24VDC via FBM baseplate backplane

Protection:Transient surge absorption for each signal terminal

Environmental standard:Compliant with ISA‑S71.04 Class G3 industrial atmospheric condition

Housing:Aluminum alloy metal housing,slot‑in mechanical locking structure

Protection class:IP20

Horizontal operating temperature:0℃ ~ +60℃

Vertical operating temperature:‑20℃ ~ +85℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:1.00kg

Dimensions:36mm ×128mm ×144mm

Certification:CE,UL

MTBF:>83000 hours

Built‑in function

FBM203B wide‑range RTD input module converts field‑side RTD resistance sensor signals to digital process data for Foxboro I/A‑Series DCS system. It features extended 0‑640Ω resistance measuring range compared with standard FBM203. Channel‑by‑channel galvanic isolation effectively suppresses ground‑loop interference inside instrument cabinet. Sigma‑delta conversion guarantees high‑accuracy temperature measurement. Open‑circuit detection quickly identifies broken sensor‑wiring faults. Hot‑swap supports online module replacement without system shutdown,widely applied for furnace,heater,reactor and storage‑tank temperature‑monitoring‑loop maintenance in petrochemical,chemical and power‑plant facilities.

Product Brief

FBM203B belongs to Foxboro I/A Series legacy DCS RTD‑input spare‑part family,obsolete original baseplate‑mount wide‑range resistance‑temperature‑detector acquisition module component. Must match with corresponding FBM baseplate and termination assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.