California ICC UST Service Technician Practice Exam

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Where are Automatic Tank Gauges (ATG's) installed?

On the exterior of the tank
Opening in the top of the tank
Inside the control panel
At the fuel delivery point

The correct answer is: Opening in the top of the tank

Automatic Tank Gauges (ATGs) are designed to provide continuous monitoring of the product levels in underground storage tanks (USTs). They measure the liquid levels, temperature, and sometimes other parameters, allowing for accurate inventory tracking and leak detection. The installation of an ATG at an opening in the top of the tank is ideal because it allows for direct access to the product inside the tank. This location enables the sensors within the gauge to accurately gauge liquid levels and detect any changes that could indicate a leak or other issues. Additionally, the configuration of ATGs is such that their probes are lowered into the tank through the existing access points, avoiding the need for extensive modifications to the tank structure. This method of installation promotes ease of use for maintenance, calibration, and the accurate reading of tank contents, which are critical to environmental compliance and operational efficiency. Furthermore, placing the gauge inside the tank reduces the risk of damage and provides an unobstructed reading of the liquid levels.