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You probably never realized how many times a day you interact with a pressure switch.
From your kitchen to your laundry room, pressure switches are regulating the flow of gas and liquid to many of your appliances. This goes for any machinery at work or that manufactures the goods you consume as well. But not all pressure switches are alike. For instance the pressure switch in your dishwasher requires less accuracy than does the assembly line at the local factory.
So how do you know which is the right pressure switch for your needs?
The short answer is to replace the current switch with the same model. Whether through literature provided with the appliance or machine, or directly on the old switch.
However you must first determined if the pressure switch failed because it has reached its lifespan or if it failed because the use required exceeded the specifications of the part itself. So diagnosing the cause of its failure will ensure that you don't replace a bad unit with another that will fail in the near term again, causing you more downtime and more expense to repair.
Most pressure switches come in two designs:
- Electromechanical
- Solid State
Electromechanical pressure switches are the more common type of pressure switch. They are comprised of a sensing element and electrical snap action switch. When a pressure change is sensed, the switch is either opened or closed depending upon its default settings. Sometimes a differential pressure switch is needed. Differential pressure switches have two ports, and the switch is normally in equilibrium. However when either a low pressure or high pressure is detected, the contrasting pressure is produced and the switch is activated.
Solid State pressure switches employ a strain gauge that compares the pressure to the set point defined and when that point is reached an electronic relay is tripped completing the circuit. Solid State pressure switches are generally more accurate than electromechanical types.
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