Foxboro FBM02 Thermocouple/mV Input Module

FBM202 Thermocouple/mV Input Module

he FBM202 Thermocouple/mV Input contains eight thermocouple input channels, and one isolated RTD

reference junction compensation channel.

OVERVIEW

The FBM202 Thermocouple/mV Input contains eight

thermocouple input channels, and one isolated RTD

reference junction compensation channel (for terminal

temperature sensing).   Each thermocouple/mV

channel accepts standard thermocouples for various

temperature ranges, and each provides

thermocouple burnout detection (up-scale).   The

inputs are galvanically isolated from other channels

and ground.

The module performs the signal conversion required

to interface the electrical input signals from the field

sensors to the optionally redundant Fieldbus.   It

executes an Analog Input application program, which

provides integration time and Rate of Change Limits

configurable options

When connected to the appropriate TAs, the

FBM202 module provides functionality formerly

provided by the 100 Series FBM I/O subsystem.  TAs

are available which support the functionality of the

100 Series FBM02.

FEATURES

Key features of the FBM202 are:

Eight channels for input of thermocouple signals

One isolated RTD reference junction

compensation channel (for terminal temperature

sensing)

Each input channel is galvanically isolated

Rugged design suitable for enclosure in Class G3

(harsh) environments

Execution of an analog input application program

that provides conversion time and configurable

options for Rate of Change Limits

High accuracy achieved by sigma-delta data

conversions for each channel

Termination Assemblies (TAs) for locally or

remotely connecting field wiring to the FBM202

HIGH ACCURACY

For high accuracy, the module incorporates Sigma

Delta data conversion on a per-channel basis, which

can provide new analog input readings every 25 ms,

and a configurable integration period to remove any

process noise and power line frequencies.

Each time period, the FBM converts each analog

input to a digital value, averages these values over

the time period and provides the averaged value to

the controller.