01

Varec 6700

Power-Free Gaugeboard Liquid Level Indicator

Varec 6700

The Varec® 6700 Liquid Level Indicator (LLI) is designed for terminal operators, refinery engineers, environmental compliance managers, and facility operators who need continuous, power-free tank-side level visibility on atmospheric and low-pressure fixed-roof, cone-roof, and bolted storage tanks.

Unlike powered radar, ultrasonic, or magnetostrictive level gauges that depend on field wiring and periodic calibration, the 6700 LLI is a mechanical float-and-tape gaugeboard: a 316 SS float follows product level, cable movement drives a high-contrast target along a large-format vinyl-faced aluminum board, and operators read innage directly from the ground.

Full-travel boards cover tanks to approximately 62 ft (23 m), and half-travel configurations extend to approximately 97 ft (29 m) for tall vessels. Resolution is 1 in (25 mm), sufficient for daily inventory reconciliation, operational monitoring, and site-level reporting.

Service-specific kits — Standard (ST), Bolted tank (BL), Stainless (SS), Severe Service FRP/PTFE (SV), and Asphalt (AP) with oil-seal option above 200 °F (93 °C) — adapt the 6700 to petroleum, potable water, corrosive chemicals, and heated bitumen. In-service installation keeps tanks on line during deployment and supports EPA SPCC inspection practice.

Varec 6700
Varec 6700
02

Features

Power-Free Mechanical Indication

Continuous tank-side level visibility without electrical supply, batteries, or calibration equipment, enabling deployment at remote, unpowered, or resource-limited facilities.

Large-Format Gaugeboard

A ~2 mm aluminum board with weather-resistant vinyl facing and a bright target delivers high-contrast, ground-level readability across the full height of the tank.

1 in (25 mm) Resolution

Target tracking to 1 in (25 mm) innage resolution supports consistent daily inventory reconciliation, operational monitoring, and site reporting.

Full- and Half-Travel Designs

Full-travel boards reach approximately 62 ft (23 m); half-travel configurations extend to approximately 97 ft (29 m) for tall cone-roof and bolted storage vessels.

In-Service Installation

Kits and procedures support mounting on atmospheric and low-pressure tanks while on line, minimizing costly shutdowns and operational downtime during deployment.

Service-Specific Kits

Standard, Bolted, Stainless, Severe Service (FRP/PTFE), and Asphalt kits match the 6700 to petroleum, water, corrosives, and heated products above 200 °F (93 °C).

Applications

  • Fuel Terminals and Refineries: Reliable visual indication on cone-roof and fixed-roof atmospheric storage where power-free backup or secondary indication supports daily inventory verification.
  • Corrosive Chemical Storage: Severe Service (FRP/PTFE) kits withstand aggressive chemistries where standard metallic hardware would corrode, protecting long-term measurement integrity.
  • Potable Water Tanks: Stainless wetted parts maintain sanitary conditions and protect water quality on municipal and industrial potable water storage.
  • Asphalt and Heated Service: High-temperature sheaves and oil-seal accessories keep the mechanism moving freely on heated bitumen storage above 200 °F (93 °C).
  • Legacy Bolted Tank Farms: Bolt-on hardware and a Bolted Tank (BL) kit adapt cleanly to older fixed installations without structural rework.
  • Tall Storage Vessels: Half-travel configurations extend coverage to approximately 97 ft (29 m), handling tall refinery and terminal tanks with a single, ground-readable gaugeboard.
03

Specifications

Parameter

Specification

Accuracy / Resolution

1″ (25 mm) innage resolution based on target location

Gaugeboard Construction

~2 mm aluminum with durable vinyl facing; English (ft/in) or metric (m/dm) scales

Operating Range

Full travel: 0–62 ft (23 m); Half travel: up to 0–97 ft (29 m), installation-dependent

Float & Cable

316 SS float; PTFE-coated 316 SS cable (varies by kit)

Elbows & Sheaves

Standard: aluminum housing + Delrin sheave; Severe/Asphalt: cast iron or 316 SS options

Anchoring

Steel or 316 SS top anchors; bottom anchors matched to tank hardware

Ambient Temperature

–30 °F to +160 °F (–34 °C to +71 °C)

High-Temperature Service

Oil seal recommended for process service above 200 °F (93 °C)

Installation

Atmospheric and low-pressure tanks; supports in-service and out-of-service mounting

Available Kits

Standard (ST), Bolted Tank (BL), Stainless (SS), Severe Service (SV), Asphalt (AP)

Accessories

Oil seals, elbow kits, manways, inspection covers, grounding kits, tape wipes, extension & reinforcement brackets, shock absorbers

Power

None (fully mechanical)

Primary Use

Tank-side visual level indication — not a custody-transfer device

Get a Quote
2026 COST ESTIMATE

Contact Support

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

Contact Us ↵

How accurate is the 6700 LLI?

−

The gaugeboard target tracks to 1 in (25 mm) innage resolution when properly installed and tensioned. This is a visual indication device suited to operational awareness, daily inventory reconciliation, and routine reporting — not custody transfer.

Can the 6700 LLI be installed on a live tank?

+

Yes. Kits and procedures support in-service installation on atmospheric and low-pressure tanks, keeping the tank on line and minimizing operational downtime during deployment.

Which scale units are available?

+

English (feet/inches) and metric (meters/decimeters) gaugeboards are both available. Specify the preferred scale when ordering.

What if my product is corrosive or hot?

+

Specify the Severe Service (FRP/PTFE) kit for corrosive chemistries, or the Asphalt (AP) kit for high-temperature products. For process temperatures above 200 °F (93 °C), add the oil-seal accessory.

How tall a tank can the 6700 LLI reach?

+

Full-travel boards cover tanks to approximately 62 ft (23 m); half-travel configurations extend coverage to approximately 97 ft (29 m) for tall cone-roof and bolted storage vessels.

Does the 6700 LLI need any electrical power?

+

No. The 6700 is a fully mechanical float-and-tape gaugeboard — no wiring, no batteries, no calibration. That makes it well suited to remote, unpowered, or resource-limited facilities.

Is the 6700 LLI a custody-transfer device?

+

No. The 6700 is a visual level indicator for ground-level operational awareness and inventory verification. For custody-transfer accuracy, pair a mechanical 2500 ATG float-and-tape gauge with a 2920 FTT or 8920 LPT transmitter to digitize the measurement.

How does the 6700 LLI differ from the 6600 LLI?

+

The 6600 LLI is a compact sealed gauge tube indicator for mobile and portable tanks up to 8 ft of travel. The 6700 LLI is a full-height gaugeboard for fixed atmospheric and low-pressure storage tanks up to ~97 ft with service-specific kits for corrosive and heated products.

Summary

With over a century of tank gauging heritage, Cognesense brings the Varec 6700 Liquid Level Indicator to terminals, refineries, chemical plants, water utilities, and asphalt storage sites that need dependable, power-free tank-side indication. A large-format aluminum gaugeboard with vinyl facing, 1 in (25 mm) resolution, full- and half-travel configurations, and service-specific kits for petroleum, potable water, corrosive chemicals, and heated products make it a field-proven visual reference for daily inventory and inspection practice — trusted wherever you need to measure, monitor, and protect what matters most.

Varec
Measure.
Monitor.
Protect.