2500 Automatic Tank Gauge (ATG)

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Overview

2500 Automatic Tank Gauge

Simple, power‑free float & tape measurement for inventory‑grade level on virtually any bulk storage tank — API 3.1B accuracy with optional digital integration.
The 2500 Automatic Tank Gauge (ATG) by Varec, a Cognesense brand, is a mechanically operated float & tape instrument that provides continuous, inventory‑grade level indication without requiring electrical power. A stainless-steel float follows product level; a perforated tape engages the gauge sprocket to drive the dial/counter at the tank side. With up to 0.2 in (4 mm) accuracy per API Chapter 3.1B, ATEX approvals, and a wide range of installation kits. the 2500 has been the industry standard for decades across terminals, refineries, aviation fuel farms, and chemical storage.
The gauge can be mounted on the tank roof or at grade for ground‑level reading. For control‑room visibility and temperature integration, add the 2920 Float & Tape Transmitter to digitize the mechanical measurement and publish level/temperature via open protocols (Modbus, GPU Bi‑Phase Mark, Mark/Space, L&J Tankway). An optional Negator Cassette simplifies maintenance and improves reliability by protecting the motor and tape path.
EVO 1610

Highlights

  • Power‑free operation for safe, continuous level measurement in hazardous or remote locations.
  • Inventory‑grade Accuracy: Up to 0.2 in (4 mm) per API Chapter 3.1B.
  • Easy‑to‑read dial/counter in metric or imperial units; roof or ground‑reading installations.
  • Broad Tank/Application Coverage: Fixed roof, external/internal floating roof, stilling well, spheres/bullets.
  • ATEX approvals and rugged construction for long service life.
  • Optional Negator Cassette for reduced maintenance and smoother operation.
  • Digital‑ready via 2920 Float & Tape Transmitter with Modbus, GPU/BPM, Mark/Space, and L&J Tankway, plus temperature input.

Typical Applications

  • Terminal and refinery storage tanks for multi‑product inventories.
  • Aviation fuel (jet/AV gas) farms requiring dependable, power‑free level indication.
  • Chemical and solvent storage, including corrosive service options.
  • Floating roof tanks (internal/external) and stilling wells.
  • Spheres and bullets; low‑pressure applications (see 2520 ATG for high pressure).

Technical Specifications

Table Header Table Header
Accuracy
Up to 0.2 in (4 mm) per API Chapter 3.1B; repeatability approx. ±1/16 in (±2 mm)
Measuring Range
Standard 0–60 ft (18 m); Extended up to 90 ft (27 m)
Specific Gravity
0.7 to 1.9 g/cc with correct float selection
Service Rating
Aluminum housing: atmospheric to ~2.5 PSI; cast iron housing: atmospheric to ~14.9 PSI
Operating Temperature
-40 °F to +185 °F (-40 °C to +85 °C) typical
Display
Dial/counter, metric or imperial (decimals or fractions); optional ground‑level reading kits
Approvals
ATEX II 1 G (Certificate Number: FM06ATEX0009) for use in potentially explosive atmospheres
Options
Negator Cassette, interface floats, guidewires/float wells, installation kits, limit switches
Digital Integration
Compatible with 2920 Float & Tape Transmitter: level, temperature (3‑wire resistance temperature detector or RTD), HART devices; open protocols

Integration & Accessories

  • 2920 Float & Tape Transmitter: Tank‑side digital display and protocol conversion (Modbus, GPU/BPM, Mark/Space, L&J Tankway), RTD input, optional discrete I/O
  • Negator Cassette: Self‑contained cassette that eases motor replacement, protects moving parts, and improves operation
  • 2520 ATG (High Pressure): Companion gauge for pressurized vessels (rated variants 150/220/300 PSI)

Downloads

  • 2500/2520 Automatic Tank Gauge Datasheet (TEC011)
  • 2500 ATG Installation & Operations Manual
  • Negator Cassette Datasheet
  • 2920 Float & Tape Transmitter Datasheet/Manual

Contact Support

Looking to standardize reliable level measurement or modernize existing float & tape gauges? Contact Cognesense for kit selection, ground‑reading options, and digital integration with the 2920 FTT. We’ll size floats for product specific gravity, spec accessories (guidewires, float wells, limit switches), and deliver a turnkey plan. Request a consultation or get a quote; most designs are delivered within 3–5 business days.
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FAQs

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

Up to 0.2 in (4 mm) per API Chapter 3.1B when installed and calibrated per guidelines.

Yes. Use ground‑reading kits to mount the dial/counter at grade while the float/tape remain at the roof.

Use the 2520 ATG for pressurized vessels (rated variants available).

Add the 2920 Float & Tape Transmitter to publish level/temperature via Modbus, GPU/BPM, Mark/Space, or L&J Tankway.

The optional Negator Cassette simplifies motor replacement and protects internal moving parts for smoother operation.

Related Products

  • 2920 Float & Tape Transmitter – Digital integration for level/temperature and alarms
  • 2520 Automatic Tank Gauge – High‑pressure float & tape gauge for pressurized vessels
  • 6700 Liquid Level Indicator – Gaugeboard display alternative for visual tank‑side indication