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Varec 9810 miniRTU

Compact Tank Gauging RTU

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Varec 9810 miniRTU

The Varec® 9810 miniRTU is designed for terminal operators, facility engineers, and EPC teams at small-to-medium tank farms that need Ethernet and OPC UA connectivity for existing float-and-tape, servo, and radar gauge installations — without cabinet redesign or tank-side gauge replacement.

Unlike a full modular RTU chassis that scales past what a small site actually needs, the 9810 miniRTU is a purpose-built compact gateway sized for up to 32 tanks, installed directly in the footprint of a legacy Varec 8300 Tank Gauge Interface.

Protocol family versions, bridge Honeywell Enraf GPU/BPM, Varec Mark/Space, L&J Tankway, Veeder-Root/Ronan serial, Endress+Hauser serial, Hectronic HLS, and serial Modbus to native OPC UA and Modbus TCP host output, with native API-standard tank volume calculations.

ANSI/IEEE surge protection on field connections and US, Canada, IECEE, and CE approvals support deployment across petroleum terminals, aviation fuel sites, and defense and industrial storage facilities. Remote configuration and file transfer via OPC UA client minimize on-site commissioning and maintenance time.

Varec 9810 miniRTU
Varec 9810 miniRTU
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Features

Compact Drop-In Upgrade

Installs directly in the footprint of legacy 8300 TGI units, eliminating cabinet modifications, rewiring, and prolonged downtime on modernization projects.

Native OPC UA and Modbus TCP

Built-in Ethernet publishes real-time tank data to SCADA, HMI, and enterprise inventory systems over native OPC UA and Modbus TCP for secure host integration.

Multi-Protocol Family Versions

9812 Bi-Phase Mark, 9814 Serial, 9815 Mark/Space, and 9816 Tankway variants connect Enraf, Varec, L&J, Veeder-Root, Hectronic, and Modbus gauges without replacing field instruments.

32-Tank Small-Site Scale

Purpose-built capacity for up to 32 tanks fits small-to-mid-size facilities, aviation fuel sites, and satellite installations where a full modular RTU exceeds the requirement.

ANSI/IEEE Surge Protection

Integrated surge protection on all field connections safeguards critical electronics from outdoor electrical disturbances, supporting long-term reliability in industrial and defense installations.

Remote Configuration

Remote configuration, diagnostics, and file transfers via any OPC UA client reduce site visits for commissioning, firmware updates, and parameter changes.

Applications

  • Small Tank Farm Upgrades: A cost-efficient alternative to a full-chassis RTU, scaled for small-to-mid-size petroleum, chemical, and utility tank farms.
  • Legacy 8300 TGI Retrofits: Drops directly into the 8300 TGI footprint for immediate Ethernet and OPC UA modernization with no cabinet rework.
  • Aviation Fuel Monitoring: Unifies mixed aviation gauge fleets into one Ethernet-connected interface for mission-critical inventory visibility.
  • Industrial Storage Centralization: Aggregates float-and-tape, servo, radar, and temperature data from multiple manufacturers into a single OPC UA host feed.
  • SCADA Protocol Modernization: Converts legacy Enraf BPM, Mark/Space, Tankway, and serial RTU signals into OPC UA and Modbus TCP for modern plant connectivity.
  • Defense Fuel Operations: Built-in surge protection and US, Canada, IECEE, and CE approvals support defense-grade reliability at mission-critical fuel installations.
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Specifications

Parameter

Specification

Host Communications

OPC UA, Modbus TCP, Modbus over TCP, Serial RTU

Field Protocols

Honeywell Enraf GPU/BPM, Varec Mark/Space, L&J Tankway, Veeder-Root TLS, Hectronic HLS, Modbus Master/Slave

Capacity

Up to 32 tanks (varies by family module)

Family Options

9812 Bi-Phase Mark, 9814 Serial, 9815 Mark/Space, 9816 Tankway

Serial Module

3 × RS-485 or 2 × RS-232 ports with RTU protocol support

GPU Bi-Phase Mark Module

Two BPM channels with individual surge protection for Enraf loops

Mark/Space Module

Dual connector interface for Varec and third-party Mark/Space devices

Tankway Module

Dual connector interface for L&J Tankway loops

Tank Calculations

Native API-standard volume calculations

Protection

ANSI/IEEE surge protection on field connections

Approvals

Certified for US, Canada, IECEE, and CE requirements

Configuration Tools

Remote configuration via OPC UA client or legacy utilities; supports remote file transfers

Host Integration

FuelsManager®, SCADA, HMI, enterprise inventory systems

Legacy Retrofit

Same physical footprint as Varec 8300 Tank Gauge Interface

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If you have questions not covered here, please contact the Cognesense support team for assistance.

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What is the difference between the 9810 miniRTU and the 8810 RTU?

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The 9810 miniRTU is a compact fixed-protocol unit optimized for small-to-mid-scale sites up to 32 tanks with native Ethernet, OPC UA, and Modbus TCP. The Varec 8810 RTU is a modular chassis supporting up to six add-on modules, 24 communication channels, and up to 400 tanks — the right choice for large terminals and sites with complex I/O or higher tank counts.

Can the 9810 miniRTU replace an 8300 TGI without cabinet changes?

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Yes. The 9810 is designed to install in the same physical footprint as the legacy Varec 8300 Tank Gauge Interface, minimizing rewiring and retrofit labor.

Which field protocols are supported?

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Honeywell Enraf GPU/BPM, Varec Mark/Space, L&J Tankway, Veeder-Root TLS via Serial, Hectronic HLS, Endress+Hauser serial, Ronan serial, and Modbus Master/Slave — across the 9812, 9814, 9815, and 9816 family variants.

Does the 9810 miniRTU work with FuelsManager®?

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Yes. FuelsManager® supports OPC UA and Modbus TCP connectivity and pairs directly with the 9810 miniRTU for inventory management, SCADA feeds, and site reporting.

What certifications and protections are included?

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Surge protection to ANSI/IEEE standards on all field connections, plus certification to US, Canada, IECEE, and CE requirements for global deployments.

How many tanks does a single 9810 miniRTU support?

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Up to 32 tanks per unit, varying by protocol family module. For large terminals exceeding 32 tanks, pair the 9810 miniRTU with additional units or step up to the Varec 8810 RTU, which supports up to 400 tanks per chassis.

How does the 9810 miniRTU connect to 4–20 mA transmitters like the 8920 LPT?

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The 9810 miniRTU accepts the 4–20 mA level (and optional temperature) loops from the Varec 8920 LPT through the appropriate module variant, then publishes the aggregated tank data to FuelsManager® and SCADA via OPC UA or Modbus TCP.

Can the 9810 miniRTU be configured without a site visit?

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Yes. Remote configuration, diagnostics, and file transfers are supported through any OPC UA client, reducing commissioning and maintenance trips for small and satellite sites.

Summary

With over a century of tank gauging heritage, Cognesense brings the Varec 9810 miniRTU to small-to-mid-size petroleum terminals, aviation fuel sites, and industrial storage facilities that need Ethernet and OPC UA connectivity without the scale or cost of a full modular chassis. A drop-in match for the legacy 8300 TGI footprint, native OPC UA and Modbus TCP output, multi-protocol family versions, ANSI/IEEE surge protection, and FuelsManager® integration make it the right gateway for 32-tank installations, trusted wherever you need to measure, monitor, and protect what matters most.

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