Magnetoresistive Linear Position Sensors and Switches

Magnetoresistive linear position sensors and switches are noncontact devices that read and detect presence and movement. These types of sensors and switches are capable of providing an absolute reading from the moment they are turned on. Magnetoresistive linear position sensors and switches do not need to be zeroed to an external reference. Many types of magnetoresistive linear position sensors and switches are available.

With magnetoresistive linear position sensors and switches, the resistance of a conducting strip is a function of the direction and magnitude of an applied magnetic field. They are made of nickel-iron thin film on a silicon wafer and are formed as a resistive strip. In the presence of a magnetic field, the resistance changes slightly. The most important specifications for magnetoresistive linear position sensors and switches are the operating distance, the distance to be measured, repeatability, and accuracy. Some magnetoresistive linear position sensors and switches allow the distance to be adjusted in the field. 

Magnetoresistive linear position sensors and switches are available in a number of different styles. Choices including barrel style, limit switch, rectangular or block style, slot style, and ring style magnetoresistive linear position sensors and switches. Barrel style devices switches are cylindrical and are often threaded. Limit switch styles, rectangular block styles, and ring sensors are also available. The limit switch style is similar in appearance to a contact limit switch. The sensor is separated from the switching mechanism. Rectangular or block style devices are one-piece sensors or switches. Slot style sensors are a type of magnetoresistive linear position sensors and switches that are designed to have an object pass through a sensing slot. Ring style sensors are toroidal or donut-shaped magnetoresistive linear position sensors and switches that are designed to have the object pass through center of the ring.

Digital interfaces are available for magnetoresistive linear position sensors and switches. These can be serial, parallel, or another type such as digital signal such as transistor-transistor logic (TTL). Digital interfaces for magnetorestrictive linear position sensors and switches can also have analog, digital, or computer interfaces. Housing for digital interfaces is available in plastic and metal. Additional features for magnetoresistive linear position sensors and switches are also available.

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