This closed system is recognized by many worldwide regulatory bodies as equivalent to a fixed gauging system as long as the tape remains in the valve from the beginning until the end of loading or discharging of the tank. A coiled grounding cable with large alligator clip is standard.
In addition, the tape is color marked to make tape direction and motion easily seen and to ensure full rewind position. The tape is marked in metric or english units and is anti-static coated (as is the sensor). When installed in a vapor-control valve mounted on a storage (cargo) tank, it forms a tightly sealed system that prevents toxic vapors from escaping and creates a closed gauging system for that tank. The Portable Closed Flexi-Dip measuring tape is a battery-operated electronic unit that is totally gas-tight.
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