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
For high accuracy, the module incorporates SigmaDelta 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.
STANDARD DESIGN
FBM202 has a rugged extruded aluminum exterior for physical protection of the circuits. Enclosures specially designed for mounting the FBMs provide various levels of environmental protection, up to harsh environments, per ISA Standard S71.04.
VISUAL INDICATORS
Red and green light-emitting diodes (LEDs) incorporated into the front of the module provide visual status indications of the FBM operational status.
