Explosion proof start/stop button

Larson Electronics’s EPS-2XPB-SG-MS ten amp explosion-proof momentary push button switch is designed for controlling machinery or process in industrial and commercial applications. The explosion-proof momentary switch is Class 1 Division 1 & 2 and Class 2 Division 1 & 2 rated for hazardous locations. This start/stop push button switch is constructed for heavy duty use and is factory sealed, eliminating the need for added seal fittings and compound. The switch is enclosed in a separate sealing chamber which has smooth, double flanges that mate both to the cover and the mounting enclosure to provide flame tight joints. The housing for […]

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Limit Switch Application

What is a limit switch and how is it used in a control process? Limit Switches are simply switches that are commonly used to detect the presence of a moving object when the object reaches a desired location. When the limit switch is triggered, it will operate the contacts linked to it and will close or open an electrical connection. Limit switches are either normally open (N.O.) or normally closed (N.C.) contacts. One type of limit switch is a mechanical limit switch. It is used to detect the presence of an object when physical contact is made between the object and the switch. […]

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Strain Gauge Transducers

Strain gauges are used in many instruments that produce mechanical strain because of the affect being measured. In their own right, they are used to measure the strain in a structure being stretched or compressed. The strain gauge element is a very thin wire that is formed into the shape shown. This produces a long wire all in one direction but on a small surface area. The element is often formed by etching a thin foil on a plastic backing. The completed element is then glued to the surface of the material or component that will be strained. The axis […]

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Types of Position Sensors

Position sensors are essential elements in the control of actuators. The position of both linear and rotary actuators is needed in robotic type mechanisms. There are three principle types. · Resistive · Optical · Inductive Resistive type A potentiometer is a variable electrical resistance. A length of resistance material has a voltage applied over its ends. A slider moves along it (either linear or rotary) and picks off the voltage at its position or angle. The tracks may be made from carbon , resistance wire or piezo resistive material. The latter is the best because it gives a good analogue […]

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