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Solon Pressure Switches for Hazardous Locations

Explosion Proof Industrial Control


Explosion Proof Devices - simple and proven

Protection from explosion in hazardous environments can be accomplished by either using explosion proof devices, which can contain an explosion inside an enclosure, or by pressurization or purging, which isolates the explosive gas from the electrical equipment.

Solon builds a complete line of explosion proof pressure switches with cast aluminum housings that are explosion proof and watertight while the switching mechanism is simple and proven. Pressure sensing elements outside the flame path allow a wider variety of wetted materials than would otherwise be possible. Proper selection of wetted materials allows this switch to be used in almost any corrosive process.

For technical assistance in choosing products or systems for intrinsic safety, please contact our Engineering Department:


Intrinsic Safety

Intrinsically Safe Pressure Switch


Intrinsically Safe Devices - Alll Solon Switches

Intrinsically safe equipment and wiring means the products are not capable of releasing sufficient energy in a circuit to ignite a flammable atmosphere in a hazardous location.

In order to have a fire or explosion, fuel, oxygen, and a source of ignition must be present. Intrinsically safe systems assume the fuel and oxygen is present in the atmosphere, but the system is designed so the electrical energy or thermal energy of a particular instrument loop will never be able to cause ignition.

Intrinsically Safe Mechanical Devices

All of Solon's pressure switches are manufactured as intrinsically safe products.

Solon's pressure switches are "simple apparatus" devices that will neither store nor generate more than 1.2 volts, 0.1 A, 25 milliwatts, or 20 microjoules of energy, as defined in the NEC Article 504-2. These devices require no certification when used with suitable associated apparatus (intrinsically safe barriers). Because of the low voltages and currents of intrinsically safe circuits, Solon suggests specifying gold contacts, which allows the product to open and close consistently.


Intrinsic Safety Barriers

Intrinsic Safety (IS) Barriers are another component of an intrinsically safe solution. Intrinsic safety barriers are devices that limit current, voltage, and total energy delivered to a sensor or other instrument located in a hazardous area. Limiting the energy prevents fire & explosions from occurring in areas with hazardous chemicals, gases or other ignitable atmospheres.


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