Differential Pressure Sensors

Differential pressure sensors can be used in a wide range of applications where it is necessary to measure pressure differences. Some common uses include:

• HVAC: Differential pressure sensors are used in heating, ventilation, and air conditioning systems to monitor and control air flow and filter efficiency.
• Process control: Differential pressure sensors are used in process control applications to measure pressure differences in fluid and gas flows, and to monitor filter and flow systems.
• Medical: Differential pressure sensors are used in medical applications to measure pressure differences in the lungs and other parts of the respiratory system.
• Aerospace: Differential pressure sensors are used in aerospace applications to measure the pressure difference between the inside and outside of an aircraft, and to detect leaks in the air system.
• Automotive: Differential pressure sensors are used in automotive applications to measure pressure differences across a vehicle's exhaust gas recirculation (EGR) valve.

A differential pressure sensor typically has two pressure ports that are connected to the two points where the pressure difference needs to be measured. The ports are usually connected to a flexible diaphragm that separates the two sides of the sensor. The diaphragm can flex or bend in response to changes in pressure.

When pressure is applied to one of the ports, the diaphragm will move towards the other side, which will cause the resistance, capacitance, or voltage output of the sensing element to change. The change in output signal is proportional to the difference in pressure between the two ports, which can be measured and used to calculate the pressure difference.

The output signal from the sensor is then transmitted to an electronic circuit, which can amplify, filter, and convert the signal into a usable form. For example, the signal may be converted to a 4-20 mA signal, a digital signal, or a voltage output.

Overall, a differential pressure sensor works by measuring the difference in pressure between two points and converting it into a measurable output signal. The sensor provides a precise and accurate measurement of pressure differences, which is essential for many industrial, medical, and scientific applications.