MCG 3281 — Mini Field Interface Unit

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Overview

MCG 3281

Terminal operators and engineers, automation engineers, system integrators, and EPC specifiers need a compact and cost-effective way to connect field devices to host systems. For them, the MCG 3281 Mini Field Interface Unit provides reliable communication without the complexity of a full rack-mounted interface.
Designed for small to mid-size tank gauging systems, the MCG 3281 acts as the communication bridge between L&J Tankway instruments and host platforms such as inventory management systems, SCADA, DCS, or PLCs. It supports seamless connectivity to the L&J product family—including MCG 2000MAX transmitters, MCG 1600SFI radar gauges, MCG 1500SFI servo gauges, and evo 2600 radars—while preserving access to advanced Tankway functionality.
When paired with Cognesense inventory management software, the MCG 3281 enables remote configuration, firmware upgrades, and detailed field diagnostics. Its compact footprint, built-in surge protection, and flexible communication options make it ideal for greenfield projects, retrofits, and incremental tank farm expansions.
MCG 3281

Features

Compact Mini Interface Design

Eliminates the need for large interface racks, saving panel space and reducing installation cost.

Full Tankway Functionality

Enables remote parameter configuration, software updates, and advanced diagnostics through L&J Tankway.

Reliable Data Transmission

Flexible Communication Options

Supports RS-232, RS-485, USB, and Tankway interfaces for easy integration with host systems.

Graphite Displacer Reliability

Integrated Surge Protection

Built-in suppression protects sensitive electronics from transient field voltages and wiring faults.

Scalable Power Options

Multiple power and Tankway current configurations support systems ranging from 1 to 25 tanks.

Reliable Data Transmission

Native L&J Compatibility

Purpose-built for L&J gauges, transmitters, and software to ensure predictable performance and long-term reliability.

Details

Applications

  • Small Tank Farms: Centralizes communication for 5–25 field devices without the cost or complexity of full interface racks.
  • System Retrofits & Upgrades: Extends the life of existing L&J instruments while enabling modern digital Tankway communication.
  • Inventory Management Systems: Connects field devices to centralized inventory software for monitoring, diagnostics, and configuration.
  • Protocol Bridging: Provides reliable communication between Tankway devices and standard serial host networks.
  • Remote or Satellite Sites: Compact footprint and simple mounting make it ideal for smaller depots or remote installations.
  • Field Signal Isolation & Splitting: Improves robustness by electrically isolating field devices and allowing multiple hosts to access tank data.

Technical Specifications

Table Header Table Header
Form Factor
Compact mini field interface unit
Field Interface
L&J Tankway (standard), RS-485 optional
Host Communications
RS-232, RS-485, or USB
Capacity
Configurable for 1–5 tanks or up to 6–25 tanks (depending on Tankway current option)
Power Supply
  • 110 VAC (standard)
  • 220 VAC (optional)
Tankway Power
48 VDC @ 220 mA or 1200 mA (model dependent)
Protection
Integrated surge suppression
Mounting
Wall or panel mount, small footprint
Integration
Compatible with Cognesense inventory systems and touch panels
Certifications
Industrial-grade design; hazardous-area options available by configuration

Documents and Downloads

Product Flyer

Have a look at the flyer to get all the tech specs and product features. Brochure

User Manual

Read the manual for detailed information and instructions. Manual

Calibrations

Check out a sample cert from our calibration lab. Certificate

Contact Support

If you have a question that we have not covered then just get in touch and we’ll be happy to help.

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FAQs

We have tried to answer the most common questions we are asked here.

The MCG 3281 is ideal for small to mid-size systems where only a limited number of tanks are required. It delivers full Tankway functionality without the cost, space, or complexity of a rack-based solution.
It supports the full L&J Technologies family running L&J Tankway, including MCG 2000MAX transmitters, MCG 1600SFI radars, MCG 1500SFI servos, and evo 2600 radar gauges.
Yes. Multiple power and Tankway current options allow the system to grow incrementally as additional tanks or instruments are added.
When used with Cognesense inventory management software, it enables remote parameter configuration, firmware updates, and detailed field diagnostics.
The MCG 3281 acts as a vital link between L&J field devices in the tank farm and a host computer in the control room. It provides power and communication, converting signals to the higher voltage L&J Tankway protocol for reliable long-distance data transmission.
By offering a compact, scalable solution, the MCG 3281 eliminates the need for a full, expensive field rack when you only need to connect a few devices. This significantly reduces the upfront investment for smaller installations or for adding a limited number of tanks to an existing system.

Summary

With over a century of expertise in tank measurement and safety, Cognesense delivers solutions built for reliability and longevity. The MCG 3281 Mini Field Interface Unit extends this legacy by providing a compact, cost-effective gateway that simplifies integration, protects existing investments, and supports scalable growth across modern and legacy tank gauging systems.