
The Veeder-Root TLS-350 is an automatic tank gauging system that monitors its probes and sensors for warning and alarm conditions, such as fuel leaks, excessively high or low fuel levels, and equipment problems. The TLS-350 has a range of alarms, including a High Product Alarm, a High Water Alarm, a Sensor Fuel Alarm, and a Line Equipment Alarm. The Veeder-Root TLS-350 also has a Leak Alarm Limit, which warns when the cumulative temperature-compensated product loss from a tank reaches the limit value. The system automatically interprets the limit you enter as a negative. While the device does come with a setup manual, it is recommended that the setup is performed by a certified contractor.
| Characteristics | Values |
|---|---|
| Product Name | Veeder Root TLS 350 |
| Product Type | Automatic Tank Gauging System |
| Purpose | Fuel management |
| Functions | Monitoring probes and sensors for warning and alarm conditions |
| Warnings and Alarms | Fuel leaks, excessively high or low fuel levels, equipment problems, high product, high water, sensor fuel, line equipment, low liquid, mag sensor communication, maximum product, overfill, periodic test fail, probe out, sensor open, sudden loss, delivery needed, no CSLD idle time, setup data, leak alarm limit, sudden loss limit, tank tilt |
| Troubleshooting | TLS-3XX Series Consoles Operator's Manual |
| Training | Practical training for operators to understand alarms |
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What You'll Learn

Understanding Veeder Root sensor alarm indicators
Veeder-Root TLS-350 is an automatic tank gauge system that constantly monitors its probes and sensors for warning and alarm conditions. The Veeder Root sensor alarm indicator is designed to alert operators to various issues with the tank.
The TLS-350 system has a range of alarms, each indicating a different issue. These include:
- Sensor Open Alarm: activated when the pressure sensor reading is less than -8 psi.
- Sudden Loss Alarm: triggered when the system detects a loss of fuel during an idle period.
- High Water Alarm: this alarm sounds when the water level in the tank exceeds the programmed limit.
- Overfill Alarm: this indicates that the fuel level has exceeded a programmed limit, and a potential overflow may occur.
- High Product Alarm: this alarm is activated when the product level exceeds 95% of the programmed limit.
- High Liquid Alarm: liquid has reached a certain level, either 8” on the dispenser pan sensor or 10” on the containment sump sensor.
There are also various troubleshooting guides and manuals available for the TLS-350, which help operators to identify and rectify issues. These guides include information on common alarms, the affected devices, the cause of the alarm, and the required action.
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Troubleshooting Veeder Root TLS-350 alarms
The Veeder-Root TLS-350 is an automatic tank gauge that constantly monitors its probes and sensors for warning and alarm conditions, such as fuel leaks, excessively high or low fuel levels, and equipment problems. The TLS System Warnings and Alarms Troubleshooting Guide (577014-243) is a useful resource for troubleshooting common alarms. This guide includes a table of common alarms, identifies the affected device, lists the causes of the alarm, and suggests the necessary actions to take.
Additionally, Veeder offers the TLS-3XX Series Consoles Operator's Manual (576013-610), which provides troubleshooting information for the TLS-3XX series consoles. This manual helps users identify replaceable parts and assemblies, understand alarms and diagnostic displays, and provides accepted troubleshooting guidelines for sensor, probe, and DIM problems. It's important to note that the procedures in this manual assume that your system has already been set up by a Certified Contractor.
If you are experiencing issues with your Veeder Root TLS-350, here are some initial steps to take:
- Refer to the TLS System Warnings and Alarms Troubleshooting Guide: This guide provides a comprehensive list of common alarms, their causes, and the necessary actions to resolve them.
- Consult the TLS-3XX Series Consoles Operator's Manual: This manual offers detailed information on troubleshooting various issues with the TLS-3XX series consoles, including sensor and probe problems.
- Check for any active warnings or alarms: When a warning or alarm condition occurs, the ATG displays the alarm type and its location. Pay attention to any messages or indicators on the ATG display.
- Contact the appropriate support: If you are unable to resolve the issue or require further assistance, follow your company's guidelines or contact your local Authorized Service Provider. You can also reach out to the Veeder-Root Technical Support team for help.
It is important to be familiar with the various alarms and their meanings. For example, an L12 Fuel Alarm, as mentioned in one of the sources, may indicate an issue with the 12th sensor at the site. Understanding these alarms can help you take appropriate action and seek the necessary support.
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Leak Alarm Limit setup
The Veeder-Root TLS-350 is an automatic tank gauging system that monitors its probes and sensors for warning and alarm conditions, such as fuel leaks, excessively high or low fuel levels, and equipment problems.
To set up the Leak Alarm Limit, follow these steps:
- Press "CHANGE" to enter the Leak Alarm Limit.
- Input the limit in gallons (from 1 to 99) or litres (from 4 to 399), depending on the units set up in System Units.
- Press "ENTER" to confirm your entry.
It is important to note that the system automatically interprets the limit you enter as a negative value. The Leak Alarm Limit identifies and warns of large losses of product during a leak test. To prevent false reports and alarms, do not set the limit value to identify losses of 0.2 gph (0.76 lph) or less during the test period. Instead, set the Leak Limit to identify losses of 1 gph (4 lph) or greater. Consider the desired leak rate and the duration of the test when determining the limit value. For example, a limit value of 8 gallons (32 litres) will warn of a 1 gph (4 lph) leak over 8 hours or a 2 gph (8 lph) leak in 4 hours.
Additionally, the Veeder-Root TLS-350 system also includes a Sudden Loss Limit, which immediately warns of a sudden loss of fuel during a leak test. This limit is not based on temperature-compensated volume and is intended to identify losses larger than the Leak Alarm Limit. Typically, the Sudden Loss Limit is set at 25 gallons or 100 litres, or higher.
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Sudden Loss Limit setup
The Veeder-Root TLS 350 is an automatic tank gauge system that helps operators monitor fuel levels and identify potential leaks. Setting up the Sudden Loss Limit feature on the TLS 350 is an important part of ensuring the system functions correctly. Here is a step-by-step guide on how to set up the Sudden Loss Limit:
Understanding the Sudden Loss Limit:
The Sudden Loss Limit feature on the Veeder-Root TLS 350 is designed to immediately warn of a sudden loss of fuel during a leak test. It is not based on temperature-compensated volume but rather on identifying significant fuel losses.
Determining the Limit Value:
When setting the Sudden Loss Limit, it is recommended to typically set the limit at 25 gallons or 100 litres, or higher. This limit value is intended to identify substantial fuel losses that occur suddenly, rather than gradual leaks.
Accessing the Setup Menu:
To enter the setup menu for the Sudden Loss Limit, you will need to refer to the TLS-350 System Setup Manual. This manual provides detailed instructions on navigating the system's menus and settings. It is important to ensure that you have the correct credentials and access rights to make changes to the system setup.
Entering the Sudden Loss Limit:
Once you have accessed the setup menu, follow these steps:
- Locate the "Sudden Loss Limit" setting within the menu options.
- Press the "CHANGE" button to enter the setup mode for the Sudden Loss Limit.
- Enter the desired limit value using the alphanumeric keys. You can enter the limit in gallons (from 1 to 99) or litres (from 4 to 399), depending on your preferred units of measurement.
- Press "ENTER" to confirm your entry.
- Review the displayed settings to ensure that the Sudden Loss Limit has been correctly set.
Saving the Setup Data:
After setting the Sudden Loss Limit, it is important to save the setup data to prevent data loss. To save the setup data, press "CHANGE" and then press "ENTER." The system will prompt you to confirm your choice. Confirm the save process by following the on-screen instructions.
It is important to note that the Veeder-Root TLS 350 system requires proper training and certification for installation and setup. Refer to the official manuals and guides provided by Veeder-Root for comprehensive instructions and safety precautions.
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Tank Tilt setup
The Tank Tilt procedure is for U.S. installations of the Veeder-Root TLS-350 system. Entering a Tank Tilt value is not recommended if the system is performing automatic Business Inventory Reconciliation and AccuChart.
To calculate the Tank Tilt value, follow these steps:
- Stick the tank at the fill riser opening at least three times. Record the average reading in column A of the chart.
- Before beginning this step, make sure the Tank Tilt in the display is set to 0. Record the probe's Fuel Height (In-Tank Inventory Function) reading in column B of the chart.
- Subtract the value entered in column B from the value entered in column A. Record the result in column C.
- Measure the distance in inches (or millimeters if using Metric Units) between the probe and fill risers. Record the result in column D.
- Convert the value in column D to inches (if it is not already). Multiply this value by 25.4 if it is in millimeters. Record the result in column E.
- Measure the distance in inches or millimeters from the probe riser to the center of the tank. Record the distance in column F.
- Multiply column E by column F to determine Tank Tilt (E X F = Tank Tilt Value). Record the value in column G.
- To enter the Tank Tilt value for the selected tank, press CHANGE. If the value is negative, press the +/- key so that a minus (-) sign appears on the display. Enter the value as calculated and press ENTER to confirm.
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Frequently asked questions
The TLS-350 is an Automatic Tank Gauging system that monitors its probes and sensors for warning and alarm conditions, such as fuel leaks, excessively high or low fuel levels, and equipment problems.
Some of the alarms include the High Product Alarm, High Water Alarm, Sensor Fuel Alarm, Line Equipment Alarm, Low Liquid Alarm, Mag Sensor Communication Alarm, Maximum Product Alarm, Overfill Alarm, and many more.
The Veeder Root TLS 350 comes with a setup manual that details the setup procedure. It is recommended that the setup is done by a Certified Contractor.






















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