
Presence Sensing is the act of detecting the presence or absence of an object with a contact or non-contact sensing device. The sensors then produce an electrical output signal that can be used to control equipment or processes. Limit switches are a type of sensor that detect presence and absence. Specifically, mechanical limit switches are switches that are mechanically activated, meaning that they have some sort of arm, lever, knob, plunger, etc., which is physically—or mechanically—activated by making contact with another object. As the object makes contact with the actuator of the switch, it eventually moves the actuator to its

This is the most simple and precise device used for the measurement of pressure. It consists of a transparent tube constructed in the form of an elongated 'U', and partially filled with the manometeric fluid such as mercury. The purpose of using mercury as the manometeric fluid is that their specific gravity at various temperatures are known exactly and they dont stick to the tube. The two common types of manometers are the equal limb type and unequal limb type. Operation of Manometer : To measure the pressure of a fluid which is less dense and immersible with the manometeric
School Bell PLC Project | Online Training Institute in Telugu
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Analog Values Comparison | PLC Programming in Telugu
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