Foxboro FBM18 Thermocouple RTD Millivolt Input Fieldbus Module

Technical Specifications

Model:FBM18

Brand:Foxboro

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

Function:8‑channel isolated temperature input fieldbus module,collects thermocouple,RTD and millivolt signals from field‑side temperature sensors,built‑in cold‑junction compensation for accurate temperature measurement

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

Input channel:8‑channel multi‑type temperature input;supports thermocouple,RTD,resistance and millivolt signals

Circuit feature:Group‑wise galvanic isolation,hardware cold‑junction compensation,high‑resolution A/D conversion,input open‑circuit detection

Feature:Support hot‑swap online replacement without subsystem power‑off

Diagnostic:Front‑panel multi‑color LED indicators for power and fieldbus communication status;sensor open‑circuit fault indicator

Power supply:Powered 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℃ ~ +55℃

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

FBM18 temperature input module converts thermocouple,RTD and millivolt sensor signals into digital process data for Foxboro I/A‑Series DCS system. Built‑in cold‑junction compensation guarantees thermocouple measuring precision. Group‑isolated design suppresses ground‑loop interference inside instrument cabinet. Open‑circuit detection quickly identifies broken sensor wiring faults. Hot‑swap supports online module replacement without system shutdown,widely applied for reactor,heater and furnace temperature‑monitoring‑loop maintenance in petrochemical,chemical and power‑plant facilities.

Product Brief

FBM18 belongs to Foxboro I/A Series legacy DCS temperature‑input spare‑part family,obsolete original baseplate‑mount multi‑sensor temperature‑measurement module component. Must match with corresponding FBM baseplate assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.