Description

Honeywell TA3840C Marine Tank Gauging Communication Interface Unit

Technical Specifications

• Product Model: TA3840C
• Brand: Honeywell
• Warranty: One Year
• Input Voltage: 110‑240 V AC, 50‑60 Hz marine rated power supply
• Operating Temperature: 0 °C ~ +55 °C (marine control room environment)
• Storage Temperature: ‑25 °C ~ +70 °C
• Response Time: Tank‑data refresh cycle ≤500 ms
• Protection Class: IP20 (19‑inch rack‑mount chassis)
• Accuracy Class: Marine tank‑gauging system grade, compliant with IEC‑61298
• Output Frequency: Not applicable
• Rated Current: Max 2.2 A @230 V AC
• System Capacity: Max 64 cargo tanks; up to 96 external instrument inputsHoneywell
• Expansion Slots: 2 internal slots for optional I/O boards
• Optional I/O Board 1: 48‑channel 4‑20 mA analog input board
• Optional I/O Board 2: Multifunction I/O board: 8×4‑20 mA, 16 digital‑in, 24 digital‑out
• Communication Ports: Four independent RS485 Modbus‑RTU ports; supporting ship‑system host connection
• Front‑panel HMI: LCD display + membrane function keyboard for local readout & configuration
• Alarm Output: Dry‑contact relay outputs for system & measurement alarm signals
• Certifications: Major marine classification society approvals for tanker & FPSO vessel application
• Supported Field Devices: EM540 radar gauge, T901 pressure‑temperature transmitter, PL3700X pressure sensor, CT801 gauge
• Humidity: 5‑95 % RH, non‑condensing, marine‑grade anti‑moisture design
• Weight: 2.48 kg
• Dimensions: 4U 19‑inch rack unit: 177 × 483 × 165 mm (H × W × D)
• 

Product Overview

The TA3840C is a core communication and data‑processing rack unit for Honeywell TA3840 / EMx40 marine fixed tank‑gauging systems, widely deployed on oil tankers, chemical tankers and FPSO vesselsManualsLib. It collects level, temperature, inert‑gas pressure data from tank‑mounted gauging instruments, computes tank volume and mass values, and delivers standardized data to ship loading computers, SCADA and cargo‑monitoring software.

Front‑panel LCD and keypad support on‑site local viewing of tank parameters, alarm status and basic parameter setup. Two internal expansion slots accept analog input or multifunction I/O boards to expand field‑signal acquisition capacity. Four RS485 Modbus‑RTU communication ports enable multi‑host system integration. Dry‑contact relay alarm outputs feed critical fault alerts to vessel safety‑monitoring systems. This unit works cooperatively with TA3840S safety unit and TA3840R remote display terminal to complete full‑function tank‑gauging solution. Original OEM production is discontinued; units are available as refurbished and new‑old‑stock spare parts for vessel‑system overhaul and maintenance projectsManualsLib.

Application Notes

‑ Designed exclusively for Honeywell TA3840‑series marine tank‑gauging system; verify hardware revision and firmware compatibility before replacement. ‑ Install inside vessel climate‑controlled control room cabinet; avoid salt‑fog direct erosion and condensation. ‑ Not hot‑swappable; cut off AC power before rack internal board replacement. ‑ Use marine‑grade shielded twisted‑pair cables for RS485 Modbus field‑bus wiring, strictly follow A/B signal polarity requirements. ‑ Class‑society approval validity must be re‑confirmed after spare‑part replacement for vessel‑survey compliance. ‑ Typical deployment: crude‑oil tankers, product tankers, chemical tankers, FPSO floating‑production units for cargo‑tank & ballast‑tank monitoring‑system maintenance and retrofits.