Probes
This section covers gasoline and diesel probes - for information on the optional LPG (liquefied petroleum gas)
probe, see Appendix F – LPG Probe Option.
1.18 Probe Floats
This section describes the weight specification on the enclosed Water Level Indicator, correct range of products
that can be used, identifying the Water Level Indicator for its intended product group, compatible fluid products,
level indicator(s) installation, level indicator kit part numbers and contents.
Product Level vs. Water Level
Figure 8-1 shows how the probe components work together.
The Product Level Indicator floats on the gasoline or diesel fuel and registers the overall height of the fuel. You
can use the Product Level Indicator with or without a Water Level Indicator.
Standard Water Level Indicators feature one of two different ballast weights and are etched to show gasoline or
diesel. Stainless-Steel Water Level Indicators are weighted internally and are laser-etched with their specific-
gravity value. Because fuel products are less dense than water, Water Level Indicators sink through the
product and float on the water. Water height at the product/water boundary can be determined accordingly.
Figure 9-1 Probe Installation in Underground Tank
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