(1) Bourdon tube pressure gauge: this gauge is the most popular for visual inspections. Its case is usually filled with glycerin to protect the gauge from vibrations in hydraulic systems.
(2) Pressure gauge with an electric contact: the following types are available.
i . Hydraulic piston type: this type turns a micro switch on and off by pushing a spring.
ii. Bellows type: this type turns a micro switch on and off by pushing a bellows (as in the hydraulic piston).
iii. Bourdon tube type: it turns a micro switch on and off in the same way as a pressure gauge.
iv. Pressure gauge with semiconductor
(3) Pressure sensor: this sensor outputs continuous signals for hydraulic system monitoring or servo system feedback.
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