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Common Sense of Pressure Sensors

Release time:

2023-06-06 09:04

Common Sense of Pressure Sensors
1. What is the pressure measured by the sensor?
The first thing to consider is the maximum pressure of the system. The pressure range of the pressure sensor usually required should be up to 1.5 times the maximum pressure of the system. Due to many systems, especially water pressure and process control, pressure peaks or continuous pulses, it is recommended to use these additional pressure ranges. These peaks can reach five or even ten times the "maximum" pressure and may cause sensor damage. Continuous high-pressure pulses that are close to or exceed the maximum rated pressure of the sensor can also shorten the lifespan of the sensor.
All pressure sensors are designed to withstand a maximum pressure of 200 million cycles without compromising performance. When selecting sensors, a compromise solution needs to be reached between system performance and sensor lifespan.
2. What is a pressure medium?
Another key factor to consider when selecting a sensor is the measured medium. Is the viscous liquid or slurry on the pressure head? Is it a soluble or corrosive medium or clean, dry air in contact with the sensor?
3. What is the impact on sensor accuracy?
Accuracy is a commonly used term to describe the output error of a sensor. These errors may be due to nonlinearity, hysteresis, non reproducibility, temperature, zero balance, correction, and humidity effects. Many manufacturers specify accuracy as a combination of nonlinearity, hysteresis, and non reproducibility. For many sensors, the "accuracy" is lower than the nominal value due to factors such as temperature and zero balance.
4. What is the temperature resistance of the sensor?
Like all physical device systems, pressure sensors may be incorrect or even unavailable in extreme temperature environments. Usually, each sensor has two temperature ranges, namely the operating range and the compensation range, which are included in the operating range.
The working range means that within this range, the sensor can be exposed to the medium without damage after being powered on. However, this does not mean that its performance can also reach the nominal specifications (temperature coefficient) when outside the compensation range.
The compensation range is generally a narrower range within the working range. Within this range, the sensor ensures that it can meet the nominal specifications.
5. What output should be used?
Almost all sensors have millivolt output, or voltage amplification, or milliampere, or frequency output. The selected output type depends on the distance between the sensor and the system control or display components, noise and other electrical interference, as well as the need for amplification and the placement of the amplifier. For many original equipment manufacturers, their control components and sensors are very short, so the millivolt output is usually sufficient and the cost is lower.
6. What is the excitation voltage?
The output type may determine the required excitation voltage. Many amplification sensors have built-in regulators that can operate on various uncontrolled voltage sources. Some sensors are proportional and require adjustable excitation sources. The power used will determine whether you are using a regulated power supply or an unregulated power supply. This requires a choice between system costs and all incentive measures.
7. Is the sensor interchangeable?
Is sensor interchangeability important for different systems or will it correct each aspect of the system

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