logo
logo
Sign in

Pneumatic and Hydraulic Pressure Sensors and its application.

avatar
Dipali B

Pressure Sensor Technology:-

Pneumatic and hydraulic sensors are transducers that generate an electrical signal in proportion to the measured pressure. This allows you to control the pressure with a variety of electronic devices.

The most popular technology for pneumatic and hydraulic sensors uses a physical diaphragm made of silicon, which bends under pressure. The diaphragm is a tension meter, whose electrical resistance changes when the force is applied, in which case the electrical resistance varies due to the pressure exerted by the air, gas or hydraulic fluid of the sensor. This resistor is used to modify the sensor output voltage.

Some pressure sensors for power steering applications use linear variable differential transformers. This includes a core that moves inside the hollow tube and monitors the movement of the high precision directional control valve, allowing hydraulic oil to flow to other areas of the system.

Many pressure sensors are now independent, integrating all the necessary electronics and temperature compensation technology into the device.

However, this is not always possible, since the pressure used in hydraulic systems increases, increasing efficiency and making the entire system smaller and more compact. An alternative is the built-in sensor, in which the electronic components are separated from the sensor itself. This allows the sensor to work in environments characterized by high temperatures, vibrations and radiation.

To resist harsh environments, pressure sensor chips are designed so that the medium (gas or liquid) comes into contact only with silicon to protect electronic components.

Some pressure sensors for pneumatic and hydraulic pressure work by measuring the expansion of a flexible tube, not the pressure of a gas or liquid. This allows you to detect blockages in the tube and monitor the performance of the pump.

Measurement options:-

Like other types of pressure sensors, sensors used in pneumatic and hydraulic devices can measure differential pressure (the difference between two pressures) or absolute pressure (measured against zero or other absolute value).

In the pressure regulator, the differential pressure sensor compares the pressure on both sides of the valve to determine if the inlet flow is equal to the outflow.

Applications:-

Examples of systems based on pneumatic technology include vehicle tires, air brakes (buses, trucks and trains), air compressors, compressed air engines, vacuum pumps, etc.

Examples of hydraulic devices include vehicle braking systems, power steering systems, shock absorbers, utility vehicles such as excavators and aerial platforms, and industrial machines such as elevators and hydraulic presses.

The most important application of pressure sensors in pneumatics and hydraulics is to ensure that the pressure in the system is within the correct level or the optimum range.

This is especially important for hydraulics, where the liquid in the system is volatile or flammable (for example, mineral oil) and reaches very high pressures and temperatures, which can lead to leaks and accidents.

The pressure sensor works like an automatic valve (see figure below) designed to control the pressure of a part of the pressure regulator or system. Pressure regulators adjust the demand for gas or liquid to the needs of the system while maintaining a constant output pressure. As the system requires more power, the load flow must increase and the regulator flow must increase. Otherwise, the controlled pressure drops.

Options and specifications of Pneumatic and Hydraulic Sensor:-

Pneumatic and hydraulic sensors generally have a pressure range that can be measured, for example, 0-200 bar. In addition, you can specify a temperature range (for example, -40ºC to 85ºC) that allows the device to provide safe pressure limits and accurate readings that can cause a malfunction.

Most pneumatic and hydraulic sensors specify an error band (for example, ± 0.05%) that indicates the level of accuracy of the sensor.

Other options include input and output connection types and physical specifications such as output signals, materials (including parts in contact with the liquid), thread sizes and sizes.

Limitations:-

Hydraulics in particular is used in harsh and demanding environments that contain extreme heat, water, dust and radiation. The hydraulics of large vehicles can be affected by physical shocks and vibrations, and sudden pressure spikes can also occur. Therefore, the pressure sensor must be able to withstand these conditions and continue to function properly.

collect
0
avatar
Dipali B
guide
Zupyak is the world’s largest content marketing community, with over 400 000 members and 3 million articles. Explore and get your content discovered.
Read more