---
title: "ATG alarms: how to read Veeder-Root, INCON and OPW"
description: "How to respond to an ATG alarm without guessing: preserve the exact message, identify its channel and asset, verify configuration, and escalate under the…"
url: "https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/"
language: "en"
---

MaintenanceNovember 18, 20255 min readUpdated September 4, 2026

# Automatic Tank Gauging (ATG) alarms: how to interpret Veeder-Root, INCON and OPW

How to respond to an ATG alarm without guessing: preserve the exact message, identify its channel and asset, verify configuration, and escalate under the manual, observed risk and site procedure.

![Dagoberto Torres](https://masterservices.org/images/equipo/dago.webp)

By [Dagoberto Torres](https://masterservices.org/en/somos/#equipo-dago)

Head of Operations

![Conceptual illustration of an automatic tank gauging console](https://masterservices.org/images/editorial/atg-engraving-1400.webp)

Conceptual illustration

About this image

AI-assisted editorial illustration. Visual reference: ProGauge MagLink LX Plus / Dover Fueling Solutions. Not a product photograph, installation drawing or test procedure; consult the applicable technical documentation.

In this article

1.  [01What an ATG may monitor](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#what-an-atg-may-monitor)
2.  [02Five details to preserve before touching the console](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#five-details-to-preserve-before-touching-the-console)
3.  [03Classify by signal, not by color](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#classify-by-signal-not-by-color)
4.  [04Safe initial response](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#safe-initial-response)
5.  [05Diagnosis by manufacturer and configuration](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#diagnosis-by-manufacturer-and-configuration)
6.  [06Log and closeout](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#log-and-closeout)
7.  [07Frequently asked questions](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#frequently-asked-questions)
8.  [08Application record: responding to an ATG alarm](https://masterservices.org/en/blog/alarmas-atg-veeder-root-incon-opw-panama/#application-record-responding-to-an-atg-alarm)

An automatic tank gauge, or ATG, combines signals from probes and sensors configured for one facility. When an alarm appears, the displayed text is a clue tied to that configuration; it is not a complete diagnosis and should not trigger the same automatic response at every station. A responsible response preserves evidence, identifies the asset and follows the manual and the site safety procedure.

## What an ATG may monitor

Depending on the equipment and installed modules, a system may display product level, water, temperature, interstitial or sump sensor status, automatic tests, inventory and communication faults. The [EPA page on internal release-detection methods](https://www.epa.gov/ust/release-detection-underground-storage-tanks-internal-methods) explains the role of ATG systems in release detection. It is a U.S. technical reference, not Panamanian law.

Capabilities vary by console, software, probes, sensors, relays and programming. [Veeder-Root TLS-450PLUS](https://www.veeder.com/us/automatic-tank-gauging-products/tls-450plus-automatic-tank-gauge), [OPW SiteSentinel iSite](https://www.opwglobal.com/en/products/us/retail-fueling-products/ast-equipment/electronic-tank-gauging/sitesentinel-isite) and [Franklin EVO](https://www.franklinfueling.com/en/products/fuel-management-systems/automatic-tank-gauges/evo-series/evo-200--evo-400/) publish resources for specific product families. Do not assume that a label, channel or function behaves the same in a different version.

## Five details to preserve before touching the console

1.  Exact message and code, without paraphrasing.
2.  Date and time of activation and acknowledgment.
3.  Associated tank, dispenser, sump or channel.
4.  Operating state, level, delivery, rain or recent maintenance.
5.  Available photograph or export and the responder’s name.

Acknowledging an alarm to silence its sound is not the same as resolving it. Clearing the event or restarting the system before preserving it can remove useful evidence and create a false appearance of normal operation.

## Classify by signal, not by color

| Signal family | Initial verification | Limit of the conclusion |
| --- | --- | --- |
| Liquid in a sump or interstice | Channel, sensor, location and safe observation | The sensor alone does not identify composition or origin |
| Water in a tank | Reading, configured threshold and independent confirmation | It does not automatically prove phase separation |
| Test or inventory | Conditions, sales, deliveries, missing data and configuration | A statistical alert does not locate a release by itself |
| High product or overfill | Level, transfer and configured capacity | Do not confuse programmed volume with actual capacity |
| Probe, sensor or communication fault | Power, channel, wiring and manual-based diagnosis | Missing data do not equal absence of risk |

## Safe initial response

Follow the facility emergency procedure. If there is evidence of released product, vapors, fire, overfill, exposure or another unsafe condition, protect people and activate the site’s emergency and authority channels. For signals without immediate emergency evidence, preserve the event, verify the asset and escalate to competent personnel under the manual. Do not open containment, handle wiring or remove liquid without suitable authorization, isolation and equipment.

A liquid alarm can originate in product, water, a sensor, wiring or configuration. A water alarm requires confirmation of the reading and method. A failed test requires review of conditions and scope. Each hypothesis needs independent evidence before repairs are ordered.

## Diagnosis by manufacturer and configuration

Start with the console model and version, and preserve a configuration backup where supported. Identify the card, channel, probe or sensor type and threshold. Find the exact message in the applicable manual. If a sensor is replaced, record part number, programming, functional test and final state; changing hardware without verifying the channel can hide an alarm instead of resolving it.

Our guide to [sumps and spill buckets](https://masterservices.org/en/blog/sumps-spill-buckets-estaciones-combustible-panama/) supports containment inspection without confusing water and fuel. The [phase-separation guide](https://masterservices.org/en/blog/separacion-fase-gasolina-e10-panama/) explains why one water reading does not classify fuel quality.

## Log and closeout

Closeout should connect the original event, checks, finding, action, functional test and responsible person. If the cause remains unconfirmed, the accurate status is “under investigation,” accompanied by operating controls. Do not label an event a false alarm merely because it disappeared after a restart.

Include the ATG in the station [maintenance program](https://masterservices.org/en/mantenimiento-estaciones-combustible/): configuration review, asset labels, sensor status, clock, backups and staff ability to retrieve events. Frequency comes from the manufacturer, criticality, history and applicable requirements, not a universal table.

## Frequently asked questions

### Should I restart the console when it alarms?

Not as the first response. Preserve the event, identify the channel and follow the manual and site procedure.

### Does interstitial liquid mean the inner tank is leaking?

Not necessarily. The signal requires confirmation of the sensor, liquid and entry path; product, water or a circuit fault may be present.

### Does Master Services remotely monitor every console?

Only when a service, connectivity and scope are expressly contracted. A console’s presence does not imply remote monitoring.

## Application record: responding to an ATG alarm

Before applying this guide to a facility, identify the console, version, channel, sensor and associated asset. Write the decision as a verifiable question: which condition generated the event and which operating control applies while it is confirmed. A recommendation without an asset, question and date is difficult to audit and may continue circulating after the facility has changed.

-   **Input:** original message, configuration, history, inspection and functional test.
-   **Source:** retain the title, issuer, edition or date, link and section used.
-   **Owner:** assign who confirms data, who authorizes action and who verifies closeout.
-   **Status:** use confirmed, pending, not applicable or out of scope; do not fill evidence gaps by assumption.

Retain the version that supported the decision and record differences between the plan and field conditions. If configuration changes, the alarm repeats or new evidence appears, reopen the record instead of reusing the earlier conclusion. This keeps the article a working framework rather than a substitute for the manual, design, risk assessment or responsible authority.

Continue learning in [Master University](https://masterservices.org/en/master-university/mantenimiento/). To review a real case, share the inventory, legible photographs, objective and available documents through our [contact page](https://masterservices.org/en/contacto/); a responsible technical recommendation begins with scope.

## Connected equipment. Controlled access.

A network connection does not require public Internet access. For tank gauges, station controllers and remote support, agree on access controls with your IT team and equipment provider.

Before enabling remote access

-   Keep equipment administration off the public Internet. Separate operational equipment from office and guest networks; allow only necessary traffic.
-   Use individual accounts, unique passwords and protected remote access with multifactor authentication, preferably phishing-resistant. Revoke temporary access when work ends.
-   Keep an inventory and review vendor security notices. Validate firmware changes with the provider, during a maintenance window, with a recovery plan.
-   Keep protected configuration backups, test restoration and record remote sessions. Define who to contact if access or equipment behavior looks suspicious.

AI-generated messages or voices are not proof of identity. Verify unusual support, payment or credential requests through a previously known contact channel. Do not share passwords or verification codes.

General guidance, not a security certification or a substitute for a site-specific assessment. Do not interrupt operating equipment without an approved safe procedure.

Technical references: [CISA · Internet exposure](https://www.cisa.gov/resources-tools/resources/exposure-reduction) · [CISA · StopRansomware](https://www.cisa.gov/stopransomware/ransomware-guide) · [FBI · AI-enabled fraud](https://www.ic3.gov/PSA/2024/PSA241203)

Next technical step

## From the article to the program

There is no universal frequency. The cycle comes from installed equipment, its history and site requirements.

-   [### Station maintenance
    
    A subsystem baseline and a logbook for each visit.](https://masterservices.org/en/mantenimiento-estaciones-combustible/)
    
-   [### Dispenser maintenance
    
    Preventive and corrective work on dispensing equipment.](https://masterservices.org/en/mantenimiento-surtidores/)
    

Related reading

## Continue exploring

Maintenance

### [Fuel-station maintenance in Panama: scope, frequency and evidence](https://masterservices.org/en/blog/mantenimiento-estaciones-combustible-panama/)

March 10, 2026

Maintenance

### [Scope- and findings-based preventive-maintenance checklist](https://masterservices.org/en/blog/lista-verificacion-mantenimiento-preventivo-estaciones/)

April 8, 2025

Maintenance

### [Fuel-station maintenance: how to build a defensible program](https://masterservices.org/en/blog/mantenimiento-estaciones-combustible-necesitas-saber/)

March 11, 2025

## Want to prevent failures before they stop operations?

Tell us what is happening at your station. We review the technical context before recommending the next step.

[Plan an assessment](https://masterservices.org/en/contacto/#contacto-form)

![Conceptual engraving of a fuel station](https://masterservices.org/images/editorial/university-engraving-720.webp)

Conceptual illustration

About this image

AI-assisted editorial engraving. Not a photograph of a Master Services project.

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