1. What kind of pressure is measured by the sensor?
A: The first thing you need to consider is the maximum pressure on your system. Generally, the maximum pressure range you need for the pressure sensor should reach 1.5 times the maximum pressure value of your system. The additional pressure ranges we recommend are due to many systems, especially water pressure and process control, with pressure spikes or continuous pulses. These spikes can reach five or even ten times the "maximum" pressure and can damage the sensor. Continuous high voltage pulses, close to or exceeding the maximum pressure rating of the sensor, also shorten the life of the sensor. But simply increasing the sensor's rated pressure is not a good idea because it sacrifices the resolution of the sensor. You can use buffers to weaken the spikes, but this is just a compromise, because it will reduce the sensor's response speed.
All pressure sensors are designed to withstand the maximum pressure in 200 million cycles without degrading performance. You need to find a compromise between system performance and sensor life when choosing a sensor.
2. What is pressure medium?
A: Another key factor to consider when choosing a sensor is the medium being measured. Will it be a viscous liquid or slurry on the pressure head? Is the contact with the sensor a soluble or corrosive medium or clean, dry air?
3, the sensor needs to achieve what kind of accuracy?
A: Accuracy is a common term used by manufacturers to describe sensor output errors. These errors may be due to nonlinearity, hysteresis, non-repeatability, temperature, zero balance, correction, and humidity effects. Many manufacturers specify accuracy as the combined effects of nonlinearity, hysteresis, and non-repeatability. For many sensors, "accuracy" is lower than the nominal value due to temperature, zero balance, and other factors.
The term "technical terms" explains these terms in more detail. With higher-accuracy sensors, the cost will be higher. Does your system really need such high accuracy? Systems that use high-accuracy sensors and low-resolution instruments are actually an inefficient solution.
4. How is the temperature resistance of the sensor?
A: Pressure sensors, like all physical equipment systems, can generate errors or even become unusable under extreme temperature conditions. In general, each sensor will have two temperature ranges, which are the working range and the compensation range. Compensation scope is included in the scope of work.
The working range means that within this range, the sensor can be exposed to the medium without damage. However, this does not mean that the performance can reach the nominal specification (temperature coefficient) when outside the compensation range.
The scope of compensation is generally a more narrow range within the scope of work. In this range, the sensor ensures that the nominal specifications can be achieved. 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 form of: ±x% of full scale/°C, ±x% of reading/°C, ±x% of full scale in full temperature compensation range, or ±x% of full temperature compensation range reading. Without these parameters will give you uncertainty in use. Is the change in sensor output due to pressure change or temperature change? The temperature effect will be the most complicated part when understanding how to use the sensor.
5. What output should I use?
A: Almost all sensors have millivolt output, or voltage amplification, or milliamperes, or frequency output. The type of output you choose depends on the distance between your sensor and system controls or display components, noise, and other electrical disturbances, and whether you need to zoom in, place the amplifier, etc. For many OEMs, the distance between their control elements and sensors is short, so millivolt output is generally sufficient and less costly.
If you need to amplify the sensor output, it is easier to use another sensor with a built-in amplifier. In long cables, or in areas with large electrical noise, a milliamp 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 equipment outside the milliampere and frequency output.
6, what is the excitation voltage?
A: The type of output may determine the excitation voltage you need. Many amplified sensors have built-in voltage regulators that can operate over a wide range of unregulated voltage sources. Some sensors are proportional and require a regulated excitation source. The power used will determine whether you are using a regulated or unregulated power supply. This requires a compromise between system cost and all incentive sources.
7. Do I need sensors that are interchangeable?
Answer: Is the interchangeability of sensors important for different systems, or do you correct every part of the system? This is a very important issue, especially for original equipment manufacturers. When you send the product to the customer, the cost of calibration is high. If your sensor is interchangeable, you can replace the sensor in the system while still maintaining the parameters.
8. What degree of time stability is needed for the sensor?
A: Most sensors will "drift" over time. It is important to understand the long-term stability of the sensor. This prior work needs can reduce the problems that may be encountered in the future.
9, how strong the sensor needs?
A: A very common cause of headaches for users is often encountered. What is the mechanical strength of the sensor, especially its housing? It is very important to consider the environment to which the sensor will be applied. Is it in high humidity or steam environment? Is there high vibration or shock? These questions need to be considered when choosing the type of shell.
10. How do I connect the sensor to my own electrical system?
Answer: Is the short cable on the sensor sufficient? Or, in long cable applications, do you need to add a connector to the sensor? Most pressure sensors can provide cables or connectors.
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