Overview of Mechanical Pressure Switches and Selection Criteria

Mechanical pressure switches are durable and also not that expensive. In the current market, there are a variety of options that can meet a lot of requirements and support a plethora of applications. In a heavy duty mechanical pressure switch, a diaphragm opens/closes a circuit when the pressure in the medium gets above or below a specific value. For when pressure reaches the switch point, the diaphragm transmits the pressure to a micro switch. The micro-switch contact may either snap open (to open a circuit) or snap closed (to close a circuit). The hysteresis of the micro switch indicates the switch-back of the pressure switch. A good thing about mechanical pressure switches is that they do not depend on a power supply.

 

Three major factors to consider when choosing a mechanical pressure switch are:

Medium and temperature: The medium and the associated temperature play a crucial role in determining the material for the case, the sensor element and also the wetted parts.

Pressure: Diaphragms go well as sensor elements in low-pressure and vacuum applications. Pistons, that are generally made up of stainless steel, are best suited for higher pressure ranges.

Hysteresis: Hysteresis will tell you when the switch will reset. If the reset value is pretty big, the function stays active for a long time. On the other hand, when it’s small, the function will bounce between states.

A well-researched and then chosen mechanical pressure switch will have a long life. Standard units usually work for about 1 million switching cycles, while the expensive ones can last up to 5 million switching cycles. Consider this information provided in this blog before you purchase a mechanical pressure switch online.

Location: Billerica, MA, USA

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