Proximity & limit switches
STATUS & PROTECTION SIGNALS FOR POSITION & DETECTION APPLICATIONS!
Our range of proximity and limit switches provide status and protection signals for position and detection applications – helping you get the most out of your plant!
- Mechanical Limit Switches
- Mill-Type Switches
- Safety Interlock Switches
- Capacitive Proximity Sensors
- Inductive Proximity Sensors
- Magnetic Field Sensors
- Voltage Sensors
- Tubular Devices
- High Performance Sensors
- Fibre Optic Sensors
- Thru-Beam Sensors
- Retro-reflective Sensors
What is a Proximity Sensor and Limit Switch?
Proximity switches or sensors, also known as non-contact limit switches, use electromagnetic fields to detect when an object is approaching. As a non-contact switch, there is no physical contact between the object and the sensor. As such, it used to sense distances less than an inch.
They are a device that detects an object approaching and the distance. The uses of proximity switches include:
- Detection of the size of parts, speed, or use in frequency conversion counter
- Frequency conversion pulse generator
- Liquid level control
- and, Automatic connection of process programs
There are two types of proximity sensors; Inductive and Capacitive proximity sensors. Inductive proximity sensors are an idea for precise detection. For instance, this includes detecting the position of moving parts of automated assembly equipment to allow programmable logic controllers (PLC) to sequence operations. Capacitive proximity sensors are suited to liquid, powdered, and granulated materials. As such, they detect metallic and non-metallic objects through non-metallic containers. In addition, they can identify small items such as parts and wires.
A limit switch is a mechanical device that requires the physical contact of an object with the switch’s actuator to make the contact change state. As the object or target contacts the operator of the switch, it eventually moves the actuator to the ”limit” where the contacts change state.
Depending on the type of circuit, it will open or close. For example, in a normally closed (NC) circuit, the action opens the electrical contacts, and in a normally open (NO) system, it closes them.
The uses of limit switches are varied from stationary and moving objects. For example, it can be used on a fixed mount, door frame, or traveling machinery.