A Limit switch is an electromechanical object that features an actuator connected to several contacts. Once an object gets in touch with an actuator, electrical linking is broken. This helps prevent short circuits and fire from arising
A furnace limit switch consists of a thermostat and actuator interconnected with contacts. It measures the temperature of a device: when preset limits are exceeded, the object physically reaches the actuator, and an electric/pneumatic signal is sent, then the electrical linking is broken.
Models for this device may be chosen according to environmental conditions, space around, or the type of application setup.
Types of construction
There are several options available:
- Compact/Precision. These models are essential in the industrial environment. They have standard installation dimensions and the common characteristics for said device. Thanks to small sizes, they can be mounted where usual counterparts do not fit. Accuracy ranges from 3 to 5 microns (in high-precision models, it can be up to 0.5 microns).
- Metal. Such a high limit switch has a broad spectrum of various activities, and it works with several contact configurations. You can rotate it in 90° before installation — excellent choice for hazardous environments, and unsafe applications.
- Stopper Limit switches feature a mechanical stop but an absence of temperature drift. Mini versions are available. They boast long service life coupled with optimal contact force.
- Snap Action models are not as costly, and they have several types of levers, and screw terminals for simple mounting.
- Heavy-duty. These models are characterized by high-level versatility, compact size, and heavy-duty functioning.
- Hazardous Area. This construction should be placed in areas with dangerous gases or other hazardous materials (for example, flour mills, refineries, etc.).
- Double insulated. These popular models boast a large spectrum of cable entry options and various actuator styles. They have a long life span and resistance to harsh environmental conditions.