Friday, April 28, 2017

Hazardous Location Limit Switches used in various applications and environments due to ruggedness, straightforward operation




A Hazardous Location Limit Switches is known as a mechanical and electrical device consisting of a mechanical motor connected to a range of connections. The device works connections to make a break or electrical connection when an object comes into contact with the engine.

In most cases, the Hazardous Location Limit Switches will start to operate when the moving device or moving parts of the machine makes contact with the engine or operating lever which activates the switch. Then, the limit switch sets the circuit that controls the engine and its moving parts. This switch can be used as an experimental device for the magnetic start control circuit. It is allowing them to never stop, and then slow down or accelerate the functions of electric motors. The limit switches can be installed in the engine as a standard operation monitor or as an emergency device to prevent engine damage. Most keys are maintained well for connection or instant connection models.

Hazardous Location Limit Switches
Image by http://ab.rockwellautomation.com


Hazardous Location Limit Switches Allen Bradley Products Specification

Allen Bradley Hazardous Location Limit Switches are designed for use in applications such as oil refineries, grain elevators, distilleries and flour mills where hazardous gases or other material may be present. There are some products options, some of them are states bellow:

1. Sealed Contact Hazardous Location Limit Switches

The Hazardous Location Limit Switches are one touch rugged. It is tightly sealed in a glass envelope that has excellent contact reliability even in contaminated environments. The switch is listed by agents "Company Labs for use in Class I, Section 2, Groups A, B, C, D and hazardous sites as defined in the National Electricity Act.

The features of this product are stated bellow:

Enclosure Type NEMA 13, High reliability contact in polluted atmosphere, some operator power, First row, group B, C, D or second class, groups E, F, G or class III, Stick Bob, with or without rollers, adjustable push on, rotating side, cat bristles and upper or push side.

2. Watertight or Hazardous Location Limit Switches

The NEMA 802X type 4 waterproof Hazardous Location Limit Switches are designed for indoor use. It will protect the interior parts of water leakage, splash, falling water, or water hose. The features are: Some operator power, Stick Bob, First row, group B, C, D or second class, groups E, F, G or class III, rotating side, cat bristles, with or without rollers and adjust or push the top side.

3. Sealed Contact Hazardous Location Limit Switches

The 802XR Sealed Contact Hazardous Location Limit Switches is operating in the atmosphere. The location is defined as Class I, Groups B, C, D or Class II, Groups E, F or G in the National Electricity Act. Practical applications include distilleries, filters, grain elevators and flour mills. For first-class, Section 2 sites, you can also use the 802R bulletin board limit switch.


Conclusion

Hazardous Location Limit Switches are used in various applications and environments due to ruggedness, straightforward operation, operational reliability and easy installation. When conditions are hazardous and performance is critical, Allen Bradley will deliver exceptional performance.


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