Pressure sensor specifications

Due toPressure sensors have different applications and have certain specifications to maximize their performance in a given environment.

There are several main configurations listed below:

1. Measurement range: This defines the minimum and maximum pressure sensors between them, which are designed to operate without damage. This standard is more important for differential sensors as their measurements are relative, and if the magnitude of the reference pressure exceeds their range, they will not function properly.

2. Operating temperature: It is within the temperature range and is optimized based on the working principle of the sensor. It is always necessary to ensure consistent operation of the output sensors within the specified temperature range. In extremely hot or cold environmental conditions, the sensor may not function properly. Especially in the case of electronic pressure sensors used in touch screen computers and other devices, this is applicable.

3. Sensor of size: Based on the size of the application, it varies depending on the pressure required by the area and the type of detection. Therefore, the size of the sensor is an important consideration, and the design of the sensor. Usually, sensors are preferred due to their small size, as they can be easily installed in difficult areas such as air filters.

4. Measurement type: It is also important for users to know which type of pressure measurement is made by sensors: absolute value, gauge pressure, or differential. This is because different measurement techniques are used and the output changes accordingly through different processing methods.

5. Accuracy: Differential pressure measurement is the best method to make the sensor as accurate as possible. This is because the reference pressure is more controlled by users than the atmosphere measured under gauge pressure.

6. Repeatability: This can be defined as the ability of a sensor to produce the same results when a specific amount of pressure is applied over and over again. One of the most critical specifications for the formation of repeatability in sensors. Due to the specific range of sensors, the probability of them being calibrated under the same pressure is high, so the results should be reproduced by the same amount of pressure in time and again by the sensors.

7. Output type generation: The electrical output generated by the sensor can be of various types, depending on its design and the final output device. Some known formats output analog voltage, current analog quantity, digital signal (TTL), RS-232 interface, and frequency shift keying based on the HART protocol.

8. Response time: This represents the time it takes between the applied input and output. The expected pressure sensor has a small response time so that the immediate output can be generated and the system can respond quickly in the event of rapid pressure changes.
9. Offset voltage: When no input is applied, the output voltage generated can be called offset voltage. In the case of differential sensors, the offset voltage generated without reference pressure exists, and in the case of gauge pressure, it is the generated environmental pressure applied to the sensor. Offset voltage is necessary to reduce errors in the output and subtract the offset voltage from them to calculate the final output.

Limitations and challenges:

There are several limitations to the use of pressure sensors in several fields. High temperature dependence, hysteresis, inability to infer rapid and dynamic pressure changes, sensitivity to external vibrations, irreversible electronic board assembly, sensitivity to electrical, magnetic, and radio frequency (RF) fields, and incompatibility with external devices pose some challenges for general pressure sensors. In some applications, pressure sensors have limited accuracy. For example, in touch screens, the high pressure in the aviation industry can limit the operation of sensors due to the influence of multiple contacts on the sensitivity of the sensors.

Pressure sensors are essentially mobile devices that need to respond to their environmental conditions in an optimized manner. Their types and uses will continue to evolve as sensor technology continues to mature. The widespread use of touch screens or automotive pressure sensors reduces their efficiency quite quickly, so the robustness of pressure sensors is also receiving increasing priority in industrial research. However, the tool for pressure sensors, like all other tools, must be used with care and constantly checked to ensure high-quality results.