Advantage
1.Accurate measurement of pressure: The main function of a pressure gauge is to accurately measure pressure. It can measure the pressure values of various media such as gas, liquid, steam, and convert them into standard pressure units, such as Pascal (Pa), bar bar, pound force per square inch (psi), etc. Accurately measuring pressure is a very important technical indicator in industrial production, quality inspection, safety monitoring, and other fields.
2.Widely used in various fields: As pressure gauges can accurately measure pressure in various media, they are widely used in multiple fields and have become indispensable equipment in these fields. They can be used to monitor containers, pipelines, mechanical equipment, air systems, gas systems, and water treatment equipment, and ensure that they can operate normally or meet safety standards.
3.Strong reliability and long service life: Due to the excellent structural design and material quality of pressure gauges, they are usually very reliable during use and do not require frequent maintenance or replacement. Through regular maintenance and inspection, the service life of the pressure gauge can reach over 20 years, and its readings are accurate without any errors.
4.Easy to install and use: The installation of pressure gauges is very simple and easy to connect to pipelines or containers. Users only need to install the pressure gauge in the corresponding position and connect it to the medium to monitor the pressure value in real-time. Pressure gauges usually come with a window and dial, making it easy to read pressure values and perform simple operations. In addition, external devices such as electronic displays and data recorders can be connected to achieve remote monitoring and data storage functions.
5.High cost-effectiveness:Pressure gauges are usually relatively cheap, and their structure is simple and easy to maintain, making them highly cost-effective. Even if a large amount of pressure gauges are required for pressure monitoring, the total cost will not be very high. In addition, the space required for transportation and installation of pressure gauges is also relatively small, which can save a lot of space in industries such as industrial production or waste treatment.
Classification of pressure gauges
1.Classification by category of measured pressure
① Pressure gauge
② Vacuum gauge
③ Pressure-vacuum gauge
④ Differential pressure gauge
⑤ Absolute pressure gauge
2.Classification by measurement range
①-40000~40000Pa
②0~0.06MPa、0~0.1MPa、0~0.16MPa、0~0.25MPa、0~0.4MPa、0~0.6MPa、0~1MPa、0~1.6MPa、0~2.5MPa、0~4MPa、0~6MPa、0~10MPa、0~16MPa、0~25MPa、0~40MPa、0~60MPa、0~100MPa、0~160MPa、0~250MPa、0~400MPa、0~600MPa、0~1000MPa
③-0.1~0MPa
④-0.1~0.06MPa、-0.1~0.15MPa、-0.1~0.3MPa、-0.1~0.5MPa、-0.1~0.9MPa、-0.1~1.5MPa、-0.1~2.4MPa
The relationship between the two classification methods for pressure gauges mentioned above, 1 and 2, is shown in Tables 1 (general pressure gauges) and 2 (precision pressure gauges).
Table 1 General Pressure Gauge
| Types | Measuring Range/MPa |
| General Pressure Gauge | 0-0.1，0-1，0-10，0-100，0-400，0-0.16，0-1.6，0-16， 0-160，0-600，0-0.25，0-2.5，0-25，0-250，0-1000， 0-0.4，0-4，0-40，0-0.6，0-6，0-60 |
| General vacuum gauge | -0.1~0 |
| General pressure vacuum gauge | -0.1~0.06，-0.1~0.5，-0.1~2.4，-0.1~0.15，-0.1~0.9， -0.1~0.3，-0.1~1.5 |
Note: The ranges of pressure vacuum gauges are：0.16，0.25，0.4，0.6，1.0，1.6，2.5(MPa)，consistent with the upper measurement limit of the pressure gauge, so that the accuracy level and maximum allowable error can be the same.
Table 2 Precision Pressure Gauge
| Types | Measuring Range/MPa |
| Precision pressure gauge | 0-0.1，0-1，0-10，0-100，0-0.16，0-1.6，0-160，0-0.25， 0-2.5，0-25，0-250，0-0.4，0-4，0-40，0-0.6，0-6，0-60 |
| Precision vacuum gauge | -0.1~0 |
3.Classification by the accuracy class of pressure gauges
①The accuracy classes of precision pressure gauges are: 0.06%，0.1%，0.16%，0.25%，0.4%，0.6%，6 classes in total；
②The accuracy classes of general pressure gauges are：1.0%，1.6%，2.5%，4.0%，4 classes in total.
4.Classified by the nominal diameter of the pressure gauge housing
The nominal diameters are Φ 40mm，Φ50mmmΦ60mm，Φ100mm、Φ150mm、Φ200mm、Φ250mm、Φ300mm、Φ400mm。
①The relationship between the nominal diameter of the housing of a general pressure gauge and its accuracy class is shown in Table 3
Table 3 Relationship between the nominal diameter of the housing and the accuracy class of general pressure gauges
| Housing nominal diameter/mm | Accuracy class |
| 40，60 | 2.5，4.0 |
| 100 | 1.6，2.5 |
| 150，200，250 | 1.0，1.6 |
| 40，50，60(Pressure reducer gauge) | 2.5(1.6) |
② The relationship between the nominal diameter of the housing of a precision pressure gauge and its accuracy class is shown in Table 4
Table 4 Relationship between the nominal diameter of the housing and the accuracy class of precision pressure gauges
| Housing nominal diameter/mm | Accuracy class |
| 150，200，250，300，400 | 0.06，0.1，0.16，0.25，0.4，0.6 |
5.Classification by elastic components used
①Spring tube pressure gauge(C-tube, spiral tube, coiled spring tube)；
②Diaphragm pressure gauge；
③Capsule pressure gauge；
④Bellows pressure gauge.
6.Classification by Use
①Precision pressure gauge for use as a standard；
②General pressure gauge for indicating pressure；
③Pressure gauges for oxygen, hydrogen, and acetylene gases;
④Shock resistant pressure gauges for vibration and impact environmental conditions;
⑤Stainless steel pressure gauges for chemical engineering;
⑥Electric contact pressure gauge for alarm and position control;
⑦Remote pressure gauge for long-distance transmission of electrical signals;
⑧Marine pressure gauges used on ship equipment;
⑨Diaphragm pressure gauge for high viscosity and easy crystallization medium pressure in chemical fiber production;
7.Classified by the class of measured pressure
①Vacuum gauge, the upper limit of measurement is -0.1MPa；
②Micro pressure gauge, the upper limit of measurement is ±40000Pa(0.04MPa)；
③Low pressure gauge, the upper limit of measurement is 6MPa；
④Medium pressure gauge, the upper limit of measurement is 60MPa；
⑤High pressure gauge, the upper limit of measurement is 250MPa；
⑥Ultra-high pressure gauge, the upper limit of measurement is 1000MPa.
8.Classification bynumerical indication method
①Pointer type pressure gauge；
②Recording pressure gauge；
③Digital pressure gauge.
