Hydraulic Flow Volume Measurement
(1) Oil level gauge: acrylic-bar oil level gauges are widely selected for a general visual inspection. It is possible to attach a thermometer at a lower part of the gauge. A gauge with a shuttle valve or a remotereading
gauge should be used according to the Fire Service Law, if applied.
(2) Oil level gauge with an electric contact: two types are available. One is equipped with an electric contact with a needle for visual inspection, and the other is with an electric contact with a read switch.
(3) Oil level gauge for continuous signal output: generally, two types are available. One is equipped with an electric contact providing continuous signals. It indicates the oil level by a needle for visual inspection. The other type is equipped with a sensor only. The sensor is usually of a resistance type or a magnetorestrictive type.
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