Many people don’t know how to choose a low differential pressure sensor that is suitable for their needs. Today, the precautions when choosing a low differential pressure sensor will be shared with you .
1. How much accuracy does the low differential pressure sensor need
The accuracy is determined by the effects of nonlinearity, hysteresis, non-repeatability, temperature as well as zero offset scale. But it is mainly determined by nonlinearity, hysteresis and non-repeatability. What’s more, the higher the accuracy, the higher the price.
2. The temperature range of the low differential pressure sensor
Usually a low differential pressure sensor will be calibrated for two temperature sections, one of which is the normal operating temperature, and the other one is the temperature compensation range. The normal operating temperature range refers to the temperature range of the low differential pressure sensor when it is not destroyed in the state of working. When the temperature is exceeded the temperature compensation range, the application performance index may not be reached.
The temperature compensation range is a typical range smaller than the operating temperature range. The use of a low differential pressure sensor in this range will definitely achieve its performance indicators as required. Temperature affects its output from two aspects, one is the zero drift, and the other one is affecting the full scale output. The degree of change in the output of the low differential pressure sensor is caused by the variation of pressure and temperature.
3. What kind of output signal does the low differential pressure sensor need to get?
The choice of output depends on many factors, including the distance between the low differential pressure sensor and the system controller or display, whether there is “noise” or other electronic interference signals, whether an amplifier is needed as well as the location of the amplifier. For many OEM devices with a short distance between the low differential pressure sensor and the controller, the use of a low differential pressure sensor with mA output is an economical and effective solution.
If need to amplify the output signal, low differential pressure sensor with built-in amplification can be used. For long-distance transmission or strong electronic interference signals, mA-level output or frequency output can be used.
If in an environment with high RFI or EMI indicators, it is also need to consider special protection or filters in addition to choosing mA or frequency output.
4. What kind of exciting voltage to choose for the low differential pressure sensor?
The type of output signal determines which exciting voltage is selected. Many low differential pressure sensors have built-in voltage regulators, so their power supply voltage range is relatively large. Some low differential pressure sensors are quantitatively configured and require a stable working voltage. Therefore, the working voltage determines whether to use a sensor with a regulator, so the working voltage and system cost must be considered comprehensively when selecting a sensor.
5. Whether need an interchangeable low differential pressure sensor or not?
Determining whether the required low differential pressure sensor can accommodate multiple using systems. Generally speaking, this is very important, especially for the OEM products. Once the product is delivered to the customer, the cost for the customer to calibrate is quite large. If the product has good interchangeability, even if changing the low differential pressure sensor used, the effect of the entire system will not be affected.
6. The low differential pressure sensor needs to maintain stability after working overtime
Most of the low differential pressure sensor will “drift” after the excessive work, so it is necessary to understand the stability of the low differential pressure sensor before purchasing, and this kind of pre-work can reduce the troubles that will occur during using in the future.
7. The encapsulation of low differential pressure sensor
The rack is often overlooked in the encapsulation of the low differential pressure sensor, which will gradually expose its shortcomings during using in the future. When purchasing a low differential pressure sensor, it is essential to consider the future working environment of the low differential pressure sensor, such as humidity and whether there will be strong impacts or vibrations.
