The Way In Which Pressure Sensors Basically Work

Pressure sensors are very popular in our times as they are the best systems for measuring pressure when it comes to fluid substances. When a container is full of liquid, for instance, and more liquid is released in the container, the sensor detects the increase in force and transforms it into an electric charge. After the transformation, the signal obtained will be transmitted further to the interpreter device. This is how equipment like this is functioning.

Besides the direct indicator of how much force is released from the fluid, other additional things can be indicated. For example, the fluid level or how fast it is flowing etc. Depending of the type of detection, the devices can be categorized as static or dynamic.

Since the steam age, these equipments were very much used and demanded. And were used until now, when they have the same popularity. They can be categorized through the functioning principles in three types: strain gage, piezoelectric and variable capacitance.

These equipments can be found under various types and designs. They can be of high performance or of lower performance but cheap. They can be different because of the measurement ranges or temperature ranges. As an example of high performance pressure sensor, the dynamic devices which detect fast modifications in speed and pressure are the ones. They are built from quartz crystals (piezoelectric).

The strain gage systems are made of two things: the strain gauge and the diaphragm. The diaphragm detects the changing in force when the level of the fluid grows. Then the strain gauge will oppose resistance for that force, and the resistance will be calculated by a DAQ module (Data Acquisition System).

In the case of variable capacitance devices, the layout involves two metal parts: a metal diaphragm and a metal plate. These two metal parts have a specific distance between them. At the first change of the distance value, a force change is recorded. Like the accelerometer, the variable capacitance devices have a higher stability than the other device types, but they are highly sensitive when it comes to high temperatures. More, assembling them is harder than assembling the other 2 types.

The piezoelectric systems have a construction layout that is based on quartz crystals. The quartz has a natural property which makes it create electrical charges at the detection of strong forces. The signal has to be boosted after it is generated. Their disadvantage is low resistance to vibrations and shocks.

The signal obtained from the sensors is usually small and it can be measured in mV (a thousand parts is one Volt). The range of Volts that is outputted from the device is related to the amount of physical force which generates the current. For instance, zero Volts mean zero force. In this point no electrical signal is sent to the interpreter. The maximum range limit can be, for instance 5V, case in which a pressure of 5 Bars is generated.

Pressure sensors are devices that are very common in our days. They are used in many industrial domains. For example, they have a good role in the food industry. Regardless of their type, they are good tools for measuring the force generated by different fluids. But they also measure the fluid speed, the level of a fluid inside a container or many other valuable details.

Choose from a wide selection of state-of-the-art scientific technologies including the linear position sensor, calibration systems, load cells, mass flow sensor, and accelerometer. These specialized tools are very popular among the research and development industries.