Diaphragm Pressure Sensor

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The diaphragm pressure sensor is designed to measure lower pressures in the range of 330 psi and vacuums to 29.9 in. of mercury (in. Hg). The diaphragm is made of a flexible membrane, which can be rubber for lower pressures and metal for pressures up to 330 psi. The diaphragm is mounted in the middle of the capsule so that it creates two chambers. One of the chambers is open to the atmosphere and the other is connected to the source of pressure being measured. When pressure is applied to the chamber, the diaphragm will expand slightly into the open chamber. The amount of movement will be proportional to the pressure being applied. The movement can be applied directly to a switch to create a low-pressure switch. Or it can be connected to a shaft that can amplify the amount of movement through gears to provide a direct reading on a gauge. The movement can also be applied to a potentiometer so the signal can be converted to a change of resistance and then to a change of voltage if the potentiometer is connected to a bridge circuit.

Advantages of Diaphragm Pressure Sensor	Disadvantages of Diaphragm Pressure Sensor
Siginificantly faster frequency response than U tubes. Accurate: up to ±0.5% of full scale. Good linearity if deflection is no larger than the order of the diaphragm thickness.	More costly than other types of pressure sensors.

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