Differential pressure switches: basics, functionality and applications

2024-03-26 HVAC/R, Products, Wiki

Differential pressure sensors are an essential component in numerous technical systems and applications. Their ability to measure minute pressure differences between different points makes them indispensable in areas such as industrial process monitoring, the automotive industry, medical technology and many others. In this blog post, we will take an in-depth look at how differential pressure sensors work and explore their many applications.


What is a differential pressure sensor?

A differential pressure sensor is an instrument used to measure the difference in pressure between two separate points in a system. These sensors are capable of accurately detecting minute differences in pressure and converting them into an electrical signal that can then be interpreted by other devices or systems.


How does a differential pressure sensor work?

The operation of a differential pressure sensor is based on the principle of pressure measurement. These sensors have two separate pressure ports that are connected to the points between which the pressure difference is to be measured. Typically, these points are separated by some kind of medium, be it air, gas or liquid.

When the pressure changes at one of the ports, a pressure difference is created between the two ports. This difference causes a mechanical deformation or displacement in the sensor component, which is then converted into an electrical signal. This signal can then be transmitted to a control system, display or other device to provide information about the pressure difference.


Applications of differential pressure sensors

Differential pressure sensors are used in a variety of applications, from industrial processes to everyday appliances. Here are some common applications:

1. Heating, ventilation and air conditioning (HVAC) systems: differential pressure sensors are used in HVAC systems to monitor airflow and optimize ventilation efficiency.

2. Filter monitoring: In many industrial applications, differential pressure sensors are used to monitor the condition of filters. An increase in the pressure differential across a filter can indicate a blockage and the need for cleaning or replacement.

3. Fluid monitoring: Differential pressure sensors are used in medical technology and laboratory applications to monitor and control the pressure in liquid or gas lines.

4. Automotive industry: Differential pressure sensors play an important role in modern vehicles, especially in exhaust gas aftertreatment systems, in order to optimize the efficiency of exhaust gas purification systems.

Differential pressure switches are used in a wide range of applications, from industrial processes to everyday appliances. Specialized sensors such as the KRIWAN Delta-P II oil differential pressure switch also play an important role here.


KRIWAN Delta-P II oil differential pressure switches

In many technical applications, especially in reciprocating compressors, reliable oil lubrication is of crucial importance. Reciprocating compressors are usually equipped with oil pumps in order to transport a sufficient quantity of oil and thus prevent damage to the compressor. To ensure a sufficient amount of oil and to detect potential damage at an early stage, these types of compressors are often equipped with an oil differential pressure sensor.

The KRIWAN Delta-P II oil differential pressure switch is characterized by its precision and reliability. It enables precise and reliable measurements to avoid errors and increase the service life of the system. Thanks to its unique two-component system, the Delta-P II switch can be used flexibly and allows the switch to be removed or replaced when the refrigeration circuit is closed. In addition, the two-component system makes installation quick and easy.

The KRIWAN Delta-P II oil differential pressure switch is screwed directly into the pump housing of the compressor, eliminating the need for additional pipe connections that are prone to breakage, which further increases safety and reliability. An LED status display (optional) also enables the safety status to be recognized quickly and easily.


More information about protection technology for compound systems (PDF)


The development and use of differential pressure sensors such as the KRIWAN Delta-P II oil differential pressure switch show how continuous innovation in sensor technology helps to make technical systems more efficient and reliable. From monitoring air flows in HVAC systems to the precise control of fluids in medical devices, differential pressure sensors play a key role in optimizing a wide range of processes. Their versatility and accuracy make them indispensable tools in the modern technology landscape.

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