Pressure control is one type of control using pressure to control some equipment. Pressure controls can be control or maintenance the pressure of a gas and liquid or solid at some value. Another limit is sense that pressure has reached some preset limit or is moving out of some safe range.
Pressure is defined as a force per unit. Unit can be pounds per square inch (psi) or most popular is pascal/kilopascal (kPa). Pressure is one important industrial process variables.
There are some term in pressure switch specification :
- Adjustable operating range is range of pressures within which the pressure sensing element of the switch can be set to actuate the contact on the switch.
- Adjustable differential range / deadband is range of pressure between higher pressure limit which change electrical contact and the lower pressure limit which returns electrical contacts to their normal conditions.
- Set point repeatability is ability of the switch to operate repeatitively at its set point.
- Enclosure type is rating of enclosure based on NEMA.
- Electrical rating is current and voltage rating of electrical contacts.
- Switch arrangement is type of switch supplied.
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