1. What kind of pressure is measured by the sensor? The first thing you need to consider is the maximum pressure on your system. Generally, the maximum pressure range of the pressure sensor you need should reach 1.5 times the maximum pressure value of your system. The additional pressure ranges we suggest are due to many systems, especially water pressure and process control, which have pressure spikes or continuous pulses. These peaks may reach five or even ten times the "maximum" pressure and can cause damage to the sensor. Continuous high-voltage pulses, approaching or exceeding the maximum rated pressure of the sensor, can also shorten the lifespan of the sensor. However, simply increasing the rated pressure of the sensor is not a foolproof solution, as it would sacrifice the resolution of the sensor. You can use a buffer to reduce spikes, but this is only a compromise as it will slow down the sensor's response speed.
All pressure sensors are designed to withstand maximum pressure over 200 million cycles without compromising performance. When choosing a sensor, you need to find a compromise solution between system performance and sensor lifespan.
2. What is a pressure medium?
Another key factor to consider when selecting a sensor is the medium being measured. Will there be a viscous liquid or slurry substance on the pressure head? Is the medium in contact with the sensor soluble or corrosive, or clean and dry air?
This question determines whether it is necessary to impact the mold and what materials are used to come into contact with the medium. The Longlv department has manufactured some other equipment with impact molds and pressure terminals, both of which have stainless steel films for medium contact, ensuring that corrosive media will not cause any problems.
3. What kind of accuracy does the sensor need to achieve?
Accuracy is a commonly used term by manufacturers to describe sensor output errors. These errors may originate from nonlinearity, hysteresis, non repeatability, temperature, zero equilibrium, correction, and humidity effects. Many manufacturers, including the Longlv department, specify accuracy as a combination of nonlinearity, hysteresis, and non repeatability. For many sensors, accuracy may be lower than the nominal value due to factors such as temperature and zero balance. The "Technical Terms" section provides a more detailed explanation of these terms. The cost of having sensors with higher precision will be higher, so does your system really need such high precision? A system composed of high-precision sensors and low resolution instruments is actually an inefficient solution.
4. How is the temperature resistance of the sensor? Pressure sensors, like all physical equipment systems, can produce errors or even become unusable in extreme temperature environments. Generally, each sensor will have two temperature ranges, namely the operating range and compensation range. The compensation scope is included in the scope of work. The working range refers to the range within which 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 scope is generally a narrower range within the working range. Within this range, the sensor ensures that it can meet the nominal specifications. The change in temperature affects the sensor in two ways: one is to cause zero drift, and the other is to affect the output of the entire range. The sensor specifications should list these errors in the following form: ± x% of full range/° C, ± x% of reading/° C, ± x% of full range within the entire temperature compensation range, or ± x% of reading within the entire temperature compensation range. If these parameters are not present, it will cause uncertainty in your use. So is the change in sensor output due to pressure or temperature changes? The Longlv department has already specified the working range and compensation range, as well as the temperature coefficients of zero and range when selling its products. When understanding how to use sensors, temperature effects will be the most complex part.
5. What kind of output should be used? Almost all sensors have millivolt output, voltage amplification, milliampere output, or frequency output. The output type you choose depends on the distance between your sensor and the system control or display components, noise, and other electrical interference, as well as whether amplification is needed and the optimal placement of the amplifier. For many original equipment manufacturers, their control components and sensor distances are very short, so millivolt output is generally sufficient and cost-effective. If you need to amplify the sensor output, it is simpler to use another sensor with a built-in amplifier. In long-distance cables or areas with high electrical noise, milliampere output or frequency output is required. In environments with strong radio frequency interference and electromagnetic interference, you need to consider adding additional shielding or filtering devices outside the milliampere and frequency output.
6. What is excitation voltage?
The type of output may determine the excitation voltage you need. Many amplification sensors have built-in voltage regulators that can operate over a wide range of unregulated voltage sources. Some sensors are proportional and require an adjustable excitation source. The power supply used will determine whether you are using an adjusted power supply or an unregulated power supply. This requires a compromise between system costs and all incentive sources.
7. Do I need sensors with interchangeability?
Is sensor interchangeability important for different systems, or will you calibrate every part of the system? This is a very important issue, especially for original equipment manufacturers. The cost of calibration is high when you deliver the product to the customer. If your sensor is interchangeable, you can replace the sensor in the system while keeping the parameters unchanged.
8. What level of time stability does a sensor require?
Most sensors will drift over time. Understanding the long-term stability of sensors is crucial. This preliminary work needs to reduce potential problems that may arise in the future.
9. What kind of robustness is required for the sensor? A very headache inducing factor that users often encounter is what kind of mechanical strength sensors need, especially their casing? It is very important to consider the environment in which the sensor will be applied. Is it in a high humidity or water vapor environment? Is there any high-intensity vibration or impact? When choosing the type of shell, these issues should be carefully considered.
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