How to select digital pressure gauge?

Pressure gauges are common measuring instruments and are widely used in various production fields. The selection of pressure gauges should be based on the requirements of use, and on the premise of meeting the technical requirements of the process, should be comprehensively considered based on the principle of economy and practicality, so as to reasonably select the accuracy grade, range, type and model.

Selection of accuracy grades for digital pressure gauges

The accuracy level of the general pressure gauge is: 1.0/0.4/0.2/0.1 optional

The precision digital pressure gauge, that is, the high-precision digital pressure gauge, has an accuracy level of up to 0.005.

Selection of digital air pressure manometer

When choosing a digital pressure gauge, it should be clear that the measured pressure is: negative pressure/compound, micro pressure, conventional, ultra-high pressure, the measured pressure is different, and the price will be different.

The things to note here are:

1. When measuring stable pressure, the maximum working pressure should not exceed 2/3 of the range.

2. When measuring pulsating pressure, the maximum working pressure should not exceed 1/2 of the range

3. When measuring high pressure, the maximum working pressure should not exceed 3/5 of the range

4. To ensure measurement accuracy, the minimum working pressure should not be lower than 1/3 of the range. According to the above principles, after calculating a value according to the measured maximum pressure, select a value slightly larger than this value from the pressure gauge range series to be the selected range.

Measuring medium of digital pressure indicator

Different types of pressure gauges should be used to measure different media and use environments

1. Water, gas, oil and liquid digital pressure gauges can meet the requirements of non-corrosive medium to stainless steel.

2. For special media, you can communicate with the manufacturer when purchasing, and realize the realization by choosing customized solutions such as different cores, different material shells, etc.

Whether belt control or remote signal requirements are required

1. When there are control protection requirements, digital pressure switch or pressure controller, digital display electric contact pressure gauge, etc. can be used.

2. When remote transmission is required, remote digital pressure gauge can be selected, and the remote transmission signal is 4-20mA or RS485.

3. Whether you need to store data, if you need to choose a recording digital pressure gauge (recording digital pressure gauges can generally store 10 million data, connect to a computer through USB, and export data in real time).

4. Finally, it is necessary to clarify the power supply voltage, threaded interface, and whether explosion-proof is required. Generally, the size of the dial of the digital pressure gauge does not affect the price. This can be purchased according to actual needs.

How to choose a reasonably priced product that matches the working conditions is believed to be the first issue that every user must consider. Based on the above, to choose a suitable digital pressure gauge, the maximum pressure overload, accuracy, , Measuring medium, range, thread, power supply (general intelligent digital pressure gauge is battery powered).

Digital manometer gauge selection precautions

1. The range of the digital pressure gauge installed on the boiler and pressure vessel, its maximum range (the limit value of the scale on the dial) should be adapted to the working pressure of the equipment. The range of the digital pressure gauge is generally 1.5 to 3 times the working pressure of the equipment, preferably 2 times.

If the range of the selected digital pressure gauge is too large, due to the digital pressure gauge of the same precision, the larger the range, the greater the absolute value of the allowable error and the deviation observed by the naked eye, which will affect the accuracy of the pressure reading; If the range of the digital pressure gauge is too small, and the working pressure of the equipment is equal to or close to the scale limit of the digital pressure gauge, the elastic element in the digital pressure gauge will be in the maximum deformation state for a long time, which is prone to permanent deformation, causing the error of the digital pressure gauge to increase. Large and reduced service life.

In addition, the range of the digital pressure gauge is too small. In case of overpressure operation, the pointer will cross the maximum range and approach zero, which will cause the operator to have an illusion and cause greater accidents. Therefore, the operating pressure range of the digital pressure gauge should not exceed 60-70% of the scale limit.

2. The accuracy of the working digital pressure gauge is expressed as a percentage of the allowable error to the limit value of the dial scale. The accuracy level is generally marked on the dial. When choosing a digital pressure gauge, the accuracy should be determined according to the pressure level of the equipment and the actual work needs.

3. Dial diameter In order to enable the operator to see the pressure value accurately, the dial diameter of the digital pressure gauge should not be too small. If the digital pressure gauge is installed high or far away from the post, the dial diameter should be increased.

4. If the medium used by the digital pressure gauge is corrosive, different elastic element materials must be selected according to the specific temperature, concentration and other parameters of the corrosive medium, otherwise the expected purpose will not be achieved.

5. Pay attention to use and maintenance on a daily basis, regularly check, clean and record the usage.

6. The general verification period of the digital pressure gauge is half a year. Mandatory verification is a legal measure to ensure reliable technical performance of digital pressure gauges, accurate value transmission, and effective guarantee of safe production.