Pressure gauges are common measuring instruments and are widely used in various production fields. The selection of the pressure gauge should be based on the requirements of use, and on the premise of meeting the technical requirements of the process, comprehensively consider the principle of saving and practicality, so as to reasonably select the accuracy grade, range, type and model.
First, the choice of the accuracy level of the digital pressure gauge
The accuracy of the general pressure gauge is: 1.0/0.4/0.2/0.1
Precision digital pressure gauges, high-precision digital pressure gauges with an accuracy rating of 0.005
Second, the choice of digital pressure gauge range
When selecting the digital pressure gauge, it should be clear that the measured pressure is: negative pressure / composite, micro pressure, conventional, ultra high pressure, the measured pressure is different, the price will be different.
The caveat here is:
1. When measuring steady pressure, the maximum working pressure should not exceed 2/3 of the range.
2. When measuring the pulsation 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 less than 1/3 of the range. According to the above principle, after calculating a value based on the measured maximum pressure, a value slightly larger than the value from the pressure gauge range is selected as the selected range.
Third, measuring medium
Different types of pressure gauges should be used to measure different media and usage environments.
1. Water, gas, oil, liquid non-corrosive medium digital pressure gauge can meet
2. For special media, you can communicate with the manufacturer when you purchase it. You can achieve it by selecting different cores and different material shells.
Fourth, whether you need to bring control or remote signal requirements
1. When there are control protection requirements, you can use digital display pressure switch or pressure controller, digital display electric contact pressure gauge, etc.
2. When there is a remote transmission request, a remote digital pressure gauge can be selected, and the remote transmission signal has 4-20 mA or RS485.
3. Whether you need to store data, if you need to choose a recordable digital pressure gauge (recorded digital pressure gauge can generally store 10 million data, connect to the computer via USB, and export data in real time).
4. Finally, it is necessary to clarify the supply voltage and thread interface. Whether the explosion protection is required or not, the dial size of the general digital pressure gauge does not affect the price. This can be purchased according to actual needs.
