What is a pressure gauge? Pressure gauge construction?

You are interested in where to buy a pressure gauge or how much does a water pressure gauge cost. You should first learn what a pressure gauge is, the structure of a pressure gauge. Difference between water pressure gauge & vacuum gauge, 3 needle pressure gauge & low pressure gauge.

In this article, we will help everyone choose the right pressure gauge for the application, ensure the quality, accuracy, durability, price of the pressure gauge as well as the pressure gauges for each medium. different.

What is a Pressure Gauge?

Pressure gauges, also known as manometers, are used to measure water pressure, pneumatic pressure, hydraulic oil, etc. With many different types of pressure gauges in terms of designs, sizes, materials, and accuracy. exactly suitable for each purpose - application - different standards.

The majority of pressure gauges are produced in the bourdon style. That is, the pressure goes into the empty bourdon tube inside. As the pressure increases, the bourdon tube expands. Through the gears, the clock will move. The dial with the numerals indicating the pressure will tell us the position of the hand with the pressure applied to the bourdon tube.

Construction of Pressure Guage

If you've ever seen a real pressure gauge and thought it had a simple structure, you're probably wrong. A pressure gauge has at least 9 different parts. Let's see what those parts are.

A pressure gauge has the following main parts:
1. The bezel is used to fit the watch case (5).
2. Glass of the watch. For high standard watches will be the impact resistant 4mm Safety Glass.
3. Rubber sealing ring called Gasket or O-ring has the task of sealing – preventing oil leakage for watches with anti-vibration oil.
4. Display face (Dial) with digits corresponding to the scale of the pressure gauge.
5. The watch case (Case) helps to contain the Bourdon tube (7) and protects the watch from impact.
6. Safety air outlet.
7. The most important component of the pressure gauge is the Sensor Gut, which is a Bourdon tube, with a "C" profile for a pressure of ≤60 Bar, with helical wound for a pressure of ≥ 60 Bar.
8. The explosion-proof cover will pop open when the inner Bourdon tube is broken. The sudden increase in pressure causes this overpressure button to burst, not causing the meter to explode, affecting the operator and the production line.
9. Lace connects an indispensable and extremely important component. Because if the connection thread is different, it cannot be fitted together.

Principle of Pressure Gauge

The principle of operation of the pressure gauge is quite simple as follows:

• Pressure is transferred up from connection thread
• Then compressed in a Bourdon tube
• As the pressure increases, the Bourdon tube expands counterclockwise
• Through the actuators, the bourdon tube dilation causes the hands to rotate.
• Based on the divisions on the display of the meter, we know the scale of the pressure at the position to be measured

We see that the working pressure gauge is quite simple. The most important thing about a pressure gauge is its accuracy and safety in use. The harder the Bourdon tube, the more pressure the meter has and vice versa.
We note that the Bourdon tube negative pressure gauge will have a pressure of -1…0 bar or -760mmHg – 0 mmHg & the Bourdon tube operation direction is opposite to that of a normal pressure gauge starting from 0 bar.

Types of Pressure Gauges

Pressure gauge is considered the most used pressure measuring device in all fields such as measuring tire pressure of motorcycles - cars, measuring water pressure, measuring compressed air pressure, measuring oil pressure, air-conditioner gas pressure gauge, hydraulic oil pressure gauge, vacuum pressure gauge.v.v. That means there are many different types of pressure gauges to meet different applications in each field.

Oil filled Pressure Gauge and Oil-free Pressure Gauge

Oil filled & Oil-Free Pressure Gauges from TE.MA – Italy

There are two types of pressure gauges: oil-filled pressure gauges and oil-free pressure gauges. An oil-filled pressure gauge means that there will be some liquid inside the gauge which is usually glycerine or food oil or silicone. It is collectively known as oil.

Oil-filled pressure gauges have many advantages over oil-free such as:

• Reduces pipe vibrations acting on clock hands
• When the pressure changes suddenly, the oil-free pressure gauge may break the needle. When there is oil, it will reduce the vibration to help the operator see the pressure value on the dial.
• Oil is not only located on the face of the watch, but also floods the internal transmission components, reducing friction and wear between components contributing to the longevity of the watch.
• The oil inside the watch helps to reduce the condensation of water vapor at high temperatures.

Glycerine oils are used in most applications at a much lower cost than silicone oils and food oils. For 3-needle pressure gauges we must use silicone oil by insulating silicone.