Selection principle of measuring and controlling instrument in different fields

1、Measurement and control instrument application

Because of different structures, relative pressure and differential pressure sensor can be divided into the determination of the absolute pressure, the atmosphere. The absolute pressure sensor, on their own with a vacuum reference pressure, measured by pressure and atmospheric pressure is not relative to the vacuum pressure. The relative pressure on the atmosphere is the atmospheric pressure as the reference pressure, so the side elastic membrane sensor and the atmosphere is always connected. The content of water vapor content changes due to changes in atmospheric pressure and the height from the ground, and all kinds of gas in the four seasons in different locations and the composition of the atmosphere. Therefore, the measured phase of pressure and the above factors. From the sensor, the elastic the two sides of the membrane were also by fluid pressure, can different point determination of fluid or fluid between the differential pressure sensor. For different purposes should be used in different structures of the needle.

2、Range of pressure range of measuring and controlling instrument

The pressure range of pressure sensor is classification. This is because the fluid bearing elastic film pressure sensor has a limit. This is usually the pressure limit, the limit is the super elastic membrane rupture. In general, a sensor voltage 2 per 0 3O of the 0% force. Therefore, the maximum pressure range of products for the specification of the voltage limit from 30 - 8% with high pressure range is not necessary.

The selection of the pressure range should mainly consider three factors: the maximum overvoltage capacity of the sensor, the relationship between the degree and the pressure range, the relationship between the price of the fine and the sensor and the pressure range

3、Precision of measuring and controlling instrument

The pressure sensor can be used as a pressure measurement element or as sensitive elements and automatic control. Especially the former one use, put forward higher requirements on the accuracy of it. Because of the influence of accuracy of pressure sensor made of a semiconductor chip by temperature sensor, therefore we should pay attention to temperature range.