##### The accuracy grade and range selection of the Normal pressure gauge are analyzed.

The **Normal pressure gauge**, as its name implies, is an instrument we often use to test various kinds of pressure. It is transformed into pressure deformation by the elastic deformation of the sensitive elements in the gauge (Bourdon tube, Bellows, Bellows); the pointer is then passed to the pointer and rotated to show the pressure. It is often used in the pressure measurement of petroleum, chemical, metallurgical and other industrial processes. The following details are for you to explain the accuracy grade and range selection of the** Normal pressure gauge**.

1. What is the accuracy level of a **Normal pressure gauge**?

The precision grade of the pressure gauge is the percentage of the allowable error of the pressure gauge in the full range. For example, a standard pressure gauge with a full range of 100 mpa and a precision rating of 1.6 has an allowable error of 100 mpa × 1.6% = ± 1.6 mpa; if the accuracy rating is 1.5, it has an allowable error of 100 mpa × 1.5% = ± 1.5 mpa.

2. Why use 1.6 grade instead of 1.5 grade for the accuracy of the Normal pressure gauge?

Because now, according to the standard, the common pressure gauge uses the R 5 number system, it stipulates that the priority coefficient uses the common ratio is 10/N power, there are 10 to the power of 1/5,1/10,1/20,1/40 and 1/80 to represent R 5, R 10, R 20, R 40 and R 80 respectively. The common ratio of the R 5 number system is 10 to the power of 1/5 = 1.60.

3. What is the relationship between the accuracy grade and the range of a Normal pressure gauge?

The percentage of its allowable error determines the accuracy grade of a Normal pressure gauge to the dial scale value. The greater the accuracy grade, the greater the allowable error to the dial scale limit value, so the larger the measuring range of a pressure gauge is, the same precision grade of the pressure gauge it measured the absolute value of the pressure allowed greater error.

4. How to select the range of a Normal pressure gauge?

(1) when measuring the stable pressure, the maximum working pressure should not exceed 2/3 of the measuring range;

(2) when measuring the fluctuating pressure, the maximum working pressure should not exceed 1/2 of the measuring range;

(3) when measuring high pressure, the maximum working pressure should not exceed 3/5 of the measuring range;

(4) to ensure measurement accuracy, the minimum working pressure should not be less than 1/3 of the measuring range.

To sum up, knowing the Normal pressure gauge accuracy level and range will be for your purchase and use great convenience.

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