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Gauge, absolute or differential?
A gauge pressure sensor measures against ambient pressure – the right choice for plant pressure, tanks and hydraulics. An absolute pressure sensor measures against vacuum and is therefore independent of air pressure, which is necessary in vacuum technology for example. A differential pressure sensor measures between two ports, typically for filter monitoring and flow via differential pressure.
Pressure switch or pressure sensor?
A pressure switch gives a signal as soon as a set value is exceeded or fallen below – inexpensive, robust and usable without any evaluation electronics. A pressure sensor delivers the measured value continuously and thereby allows control, trend monitoring and diagnostics. If only a threshold is needed, the switch is the right and cheaper choice.
What role does the medium play in pressure measurement?
The medium determines the material and the design. Aggressive media call for stainless steel or special materials, viscous or curing media a flush diaphragm without dead space, high temperatures a cooling element or a diaphragm seal. Medium, temperature and cleaning regime should be settled before selection – the pressure range alone is not enough.