Emerson KJ3002X1‑BD1

Emerson KJ3002X1‑BD1

Product Introduction Emerson KJ3002X1‑BD1 is an 8‑channel two‑wire analog input HART module for Emerson DeltaV DCS system. This module collects 4‑20 mA analog measurement signals transmitted from field two‑wire HART smart transmitters, converts analog current signals into digital data and uploads process variable values to DeltaV main controller. Simultaneously it realizes HART digital communication on each input channel, reading instrument diagnostic data, equipment tag information and self‑check status from field smart transmitters. Built‑in channel monitoring function detects field loop power loss, wire break and short‑circuit faults and reports fault events to DCS operator station.

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Description

Emerson KJ3002X1‑BD1

Technical Specifications

  • Number of Input Channels: 8 independent analog input channels
  • Input Signal Type: Two‑wire transmitter 4‑20 mA current signal
  • Supported Protocol: HART 5 / HART 7 communication protocol
  • LocalBus Power Consumption: 12 VDC, 150 mA maximum
  • Bussed Field Power Output: 24 VDC, 300 mA total for field transmitters
  • Field Circuit Rating: 24 VDC, 32 mA per channel
  • Isolation Mode: Galvanic isolation between field loop and DCS backplane circuit
  • Operating Ambient Temperature: 0℃ ~ 60℃
  • Storage Temperature: -40℃ ~ 85℃
  • Relative Humidity: 5% ~ 95%, non‑condensing
  • Protection Grade: IP20
  • Communication Interface: DeltaV LocalBus backplane bus
  • Installation Type: DeltaV rack plug‑in module

Functional Features High‑resolution analog‑to‑digital conversion circuit accurately samples 4‑20 mA measurement current from field transmitters. Integrated HART modem chip realizes bidirectional digital communication over existing two‑wire analog signal loops. Galvanic isolation components block surge interference and common‑mode noise coming from long field instrument cables. Continuous per‑channel diagnosis detects transmitter power loss, signal loop open circuit and short‑circuit failure. Front‑panel LED indicators reflect module running condition, fault status and signal state of every input channel. Hot‑swap mechanical structure supports module replacement under non‑critical process operating status without cabinet power‑off. Enables reading HART device information, remote calibration and diagnostic alarm acquisition via DeltaV configuration software or handheld HART communicator.

Application Scenarios DeltaV DCS control cabinets in chemical processing plants, oil & gas sites, pharmaceutical production workshops, water‑treatment plants and pulp‑and‑paper industry. It connects to two‑wire HART smart transmitters including pressure transmitters, flow transmitters, liquid‑level transmitters and temperature transmitters for process variable acquisition.

Performance Parameters Analog input acquisition accuracy maintains stable performance within full working temperature scope. Analog‑to‑digital sampling circuit suppresses high‑frequency industrial noise superimposed on analog signal loops. HART communication maintains stable data interaction even on long‑distance field signal cables. Fault diagnosis circuit captures loop abnormality rapidly and delivers alarm information to DCS system. LocalBus backplane guarantees high‑reliability transmission of measured process data and diagnostic events.

Material Composition Flame‑retardant engineering plastic front panel housing. Multi‑layer flame‑retardant glass‑fiber epoxy printed circuit board. Analog‑to‑digital conversion chips, HART modem module, main processing microprocessor, galvanic isolation devices and LED indicator components. Gold‑plated copper alloy backplane connector with anti‑oxidation treatment. Supporting terminal base adopts flame‑retardant PA engineering plastic and nickel‑plated copper screw wiring terminals.

Structural Features Standard plug‑in card dimension compatible with DeltaV system rack slots. Front panel equipped with module power LED, fault alarm LED and eight channel status LED indicators. Guide rail and spring‑type mechanical latch lock the module in rack slot and resist mechanical vibration inside control cabinet. Rear gold‑plated multi‑pin connector mates with DeltaV rack LocalBus backplane. Bottom contact pins realize electrical interconnection with matched wiring terminal base for field instrument wiring termination. Shell surface is designed with heat‑dissipation slots to promote natural air convection cooling.

Working Principle The module supplies 24 VDC loop power to field two‑wire HART transmitters through terminal base and field signal cables. Field transmitters convert physical process variables such as pressure, flow and liquid level into 4‑20 mA analog current signal. Analog current signal enters module channel and passes through galvanic isolation circuit, then analog‑to‑digital conversion circuit converts analog current value into digital measurement data. HART modem receives digital HART message superimposed on analog loop and parses device diagnostic information, tag data and self‑check status uploaded by field transmitter. Digital process measurement values and HART device information are uploaded to DeltaV main controller via LocalBus backplane bus. On‑board monitoring circuit continuously samples loop current and power state. When loop wire break, short‑circuit or transmitter power failure occurs, the module generates fault signal and transmits alarm message to DCS operator station.

 

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