Level DetectorsLEVEL DETECTORSFigure 5 Ball Float Level MechanismThe travel of the ball float is limited by its design to be within ±30 degrees from the horizontalplane which results in optimum response and performance. The actual level range is determinedby the length of the connecting arm.The stuffing box is incorporated to form a water-tight seal around the shaft to prevent leakagefrom the vessel.ChainFloatFigure 6 Chain Float GaugeThis type of float gauge has a float ranging insize up to 12 inches in diameter and is usedwhere small level limitations imposed by ballfloats must be exceeded. The range of levelmeasured will be limited only by the size of thevessel. The operation of the chain float issimiliar to the ball float except in the method ofpositioning the pointer and in its connection tothe position indication. The float is connected toa rotating element by a chain with a weightattached to the other end to provide a means ofkeeping the chain taut during changes in level(Figure 6).Rev. 0 Page 5 IC-03
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