How to choose the right size stainless steel pressure gauge?

Pressure gauges refer to instruments that use elastic elements as sensitive elements to measure and indicate higher than ambient pressure. The application is extremely common, and it covers almost all industrial processes and scientific research fields. It can be seen everywhere in the fields of heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle repair and maintenance factories and stores. 

Especially in the process of industrial process control and technical measurement, due to the high mechanical strength and convenient production of the elastic sensitive element of the mechanical pressure gauge, the mechanical pressure gauge is more and more widely used.

Methods to choose stainless steel gauge

The diameter of the pressure gauge dial is generally 40mm, 50mm, 60mm, 100mm, 150mm, 200mm, 250mm, 300mm, etc. Generally, we use 60mm, 100mm, 150mm in our daily life, so how do we choose which dial diameter pressure gauge?

1. Dial diameter In order for the operator to accurately see the pressure value, the dial diameter of the digital pressure gauge should not be too small. If the digital pressure gauge is installed higher or farther away from the post, the dial diameter should be increased.

2. Under normal circumstances, the accuracy of the pressure gauge with a 60mm dial diameter is 2.5, while the dial diameter of 100mm and 150mm can reach a level of 1.6 and above, and the dial diameter of the precision pressure gauge is above 150mm. The higher the diameter, the larger the corresponding dial diameter.

Users need to choose from many aspects when purchasing stainless steel pressure gauges. Among them, the dial diameter of the stainless steel pressure gauge, the material of the casing, the connection method, the measuring medium, and the range of the measuring range must be considered by the user when purchasing, and it is very important for the user to choose a suitable stainless steel pressure gauge. Today, the editor will introduce the selection method of stainless steel pressure gauge to you, I hope it can help you.

(1) the dial diameter

The diameter of the dial is the diameter of the casing that we can default to the pressure gauge. Generally, the commonly used ones are 50 mm, 63 mm, 100 mm and 160 mm (I listed them in European standards, China and some other countries will slightly different)

(2) the shell material

Generally, the shell materials of pressure gauges will be abs (engineering plastics), carbon steel, 304 stainless steel and copper alloy. We need to choose the shell materials of the pressure gauge according to the specific environment. Usually, two kinds of abs and 304 stainless steel are used.

(3) the connection method

The connection methods of the pressure gauge are divided into two types: axial (back connection) and radial (bottom connection), but in reality, customers can choose some options according to the specific situation. If it is panel mounted, the axial one can be selected at the front Flange or rear with fixed bracket, radial can choose front flange or rear fixed edge and so on.

(4) measure the medium

There are generally only two (standard) wetted materials for pressure gauges, namely copper alloy and 316 stainless steel. If the medium you measure is not applicable or corroded to these two materials, you can choose a pressure gauge and chemical seal to use together (chemical seal). The function is to effectively prevent the measuring medium from contacting the measuring element without affecting the measurement of the medium pressure by the pressure measuring element, thereby protecting the measuring element and extending the life of the measuring element)

(5) liquid filling

In some environments with relatively large mechanical vibrations, we found that many pressure gauge dials are filled with liquid. In fact, the main function of these liquids is to increase resistance and effectively prevent the pointer of the pressure gauge from vibrating continuously, so that we can be very Accurate reading of pressure value. Generally used near the pump or in environments with severe vibration.

(6) medium temperature

Generally, the measurement medium temperature of copper alloy measuring element is up to +80 degrees, and stainless steel is +200 degrees; but if the pressure gauge you choose is a liquid-filled shock-resistant pressure gauge, the maximum temperature of the medium at this time can only reach +100 degrees ; If the temperature is too high, but it needs to be shock-resistant, the method we use is condensation bending.

(7) the measuring range

Since the pressure gauge is driven by the deformation of the measuring element and the rotation of the pointer is driven by the amplifying mechanism to display the pressure value, we should also pay attention when selecting the measurement range. Generally, the maximum pressure measured is 3/4 of the range of the pressure gauge. Or 2/3 is the most ideal, if the selection is too large, the change of the pointer will be small, and the read pressure value will be inaccurate. If the selection is too small, the pressure gauge will be damaged due to overload.

(8) connection size

Now, due to the different thread standards in various countries, the main commonly used ones are m (metric), g (imperial), npt (American), and r (more used in Japan and South Korea).