Product Short Description
Product Overview & Brief Introduction
FC-TSHART-1620M is a 16-channel HART-enabled analog input terminal marshalling module for Honeywell FSC safety systems, designed exclusively for 4–20mA HART smart process transmitters (pressure, temperature, flow, level sensors). It delivers loop power to field transmitters while simultaneously superimposing bidirectional HART digital communication signals for device calibration, diagnostics and parameter upload without separate HART multiplexer hardware.
Description
Core Technical Specifications & Performance Parameters
- Channel Quantity: 16 isolated HART analog input channels
- Standard Signal Range: 4–20mA two-wire HART transmitter loop power
- Loop Supply Voltage: 24VDC isolated per channel, minimum 12VDC residual voltage at transmitter terminals
- HART Communication Compliance: HART Protocol Revision 5 / 7 fully compatible
- Channel Isolation: 1500VAC reinforced galvanic isolation per analog channel
- Measurement Accuracy: ±0.03% full scale analog signal conversion
- Anti-aliasing Filter: Adjustable low-pass filter (0.1Hz / 1Hz / 10Hz) for noisy process measurement environments
- Operating Temperature: -10°C ~ +65°C continuous operation
Function Features
- Integrated isolated 24VDC loop power supply for two-wire HART transmitters, eliminating external power distribution panels
- Simultaneous analog process value sampling and bidirectional HART digital communication for transmitter health diagnostics
- Per-channel open-loop / short-circuit / under-voltage fault LED indication
- Supports remote transmitter zero/span calibration via FSC workstation HART software interface
- Intrinsically safe SCA adapter compatible for Class I Div 1 hazardous area field transmitters
- Per-channel independent signal filtering to stabilize fluctuating process measurements
- Knife disconnect terminals allow single transmitter loop isolation during maintenance
Working Principle
Each front terminal pair supplies isolated 24VDC loop power to connected 4–20mA HART transmitters. Analog 4–20mA process signals (proportional to pressure/temperature/flow values) are filtered, isolated and converted to digital measurement data for the FSC safety controller. HART digital modulation signals superimposed on the analog current loop are demodulated by internal HART modem circuits; bidirectional digital communication enables reading transmitter fault codes, device serial numbers, and executing remote calibration commands from the control workstation. Reinforced isolation circuits block hazardous field circuit noise and ground loop interference from damaging safety rack logic.
Material Composition & Structural Characteristics
- Main PCB: High-precision double-layer FR4 fiberglass board with precision metal film resistors for signal measurement
- Terminal Assembly: Green PA6 plastic spring screw terminals rated for industrial analog signal wiring
- Communication Hardware: Dedicated HART modem ICs, high-precision differential analog-to-digital converter chips
- Isolation Hardware: Reinforced insulation optocoupler modules with 1500VAC dielectric strength
Installation Requirements
- Mount horizontally inside temperature-controlled FSC safety rack cabinets
- HART field wiring must use shielded twisted pair cables with single-point cabinet grounding
- Max cable length per HART channel limited to 1000 meters to maintain stable digital communication
- Install intrinsic safety barrier SCAs for transmitters located in explosive hazardous process zones
Application Scenarios
- Refinery SIL-rated pressure/temperature safety transmitter signal marshalling
- Natural gas pipeline flow measurement HART signal collection cabinets
- Chemical reactor level safety transmitter analog input wiring systems
- Power plant boiler steam pressure safety monitoring terminal assemblies
- Offshore oil platform wellhead HART smart sensor safety signal interface
Usage Precautions
- Avoid parallel routing of high-power AC motor cables alongside HART signal wiring to prevent communication dropout
- Perform quarterly HART device health scans to detect transmitter drift or loop wiring degradation
- Do not connect four-wire non-HART transmitters directly to module terminals without signal conversion adapters
- Adjust low-pass filter frequency matching process fluctuation speed to balance measurement responsiveness and noise suppression
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