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FIGURE #3 – Electrical equivalent. Operating parameters: Electrolytic tilt
sensors must be operated in the AC mode. Any direct current (DC) will cause the level to become unstable and even inoperable. The amount of current through the level must not exceed the maximum. Currents that are above the typical recommended value will cause the level to self heat and the readings will drift. The impedance value of the level must be specified to match the type of circuit used in order to limit the current. Excitation: The electrolytic tilt
sensor (level) can be energized in a number of ways depending on the application and performance required. Typically, there are two ways to energize and read the level. One way to energize the level is the use of a bridge type circuit (see figure #4). This configuration allows for the adjustment of the bridge resistors to match the internal impedance of the level. It must be noted that the electrolyte’s impedance will change with temperature. The impedance is inversely proportional to temperature. This can cause readings to change with temperature when the level is in an unbalanced position. Therefore, temperature compensation is required in an uncontrolled environment.
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