Pressure gauge selection and use precautions - Solutions - Huaqiang Electronic Network

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The selection of the pressure gauge should be based on the specific conditions and in accordance with the technical requirements of the process. At the same time, cost issues should also be considered. When we recommend the instrument, we should consider the following aspects:
(1) The physical and chemical properties of the measured medium, such as temperature, viscosity, degree of soiling, corrosiveness, flammability, susceptibility, and crystallization.
(2) The pressure measurement requirements of the production process, such as the measured pressure range, accuracy, and whether remote transmission, recording or upper and lower limit alarms are required.
(3) On-site environmental conditions, such as high temperature, corrosion, humidity, vibration, electromagnetic fields, etc.
In addition, for the elastic pressure gauge, in order to ensure the reliable operation of the elastic component within the safe range of elastic deformation, to prevent the pressure from damaging the elastic component and affect the service life of the instrument, the range selection of the pressure gauge must have sufficient room. Generally, when the measured pressure is relatively stable, the maximum working pressure should not exceed 3/4 of the full scale of the meter. Under the condition that the measured pressure fluctuates greatly, the maximum working pressure does not exceed 2/3 of the full scale of the meter. In order to ensure the measurement accuracy, the minimum value of the measured pressure should not be less than 1/3 of the full scale.
2, the use of pressure gauge In order to ensure the accuracy of pressure measurement, the following points must be noted when using the pressure gauge:
(1) Selection of measurement points The selected measurement points should represent the true conditions of the measured pressure. The measuring point should be selected in the straight pipe section, far from the local resistance. Preferably, the pressure guiding tube does not protrude into the interior of the object to be measured and should be flush with the process pipe. The inner diameter of the pressure guiding tube is generally 6~10mm, and the length should not be more than 50mm, otherwise it will cause transmission delay. In order to prevent the pressure guiding tube from being clogged, the pressure tapping point is generally selected on the horizontal pipe. When measuring the liquid pressure, the pressure point should be in the lower part of the pipeline so that no liquid is accumulated in the pressure guiding tube; if the liquid in the north side is easy to condense or freeze, pipe insulation equipment must be installed.
(2) When installing the measured steam pressure, a condenser or condenser should be installed to condense the steam measured in the pressure guiding tube. When the fluid to be tested is corrosive or easy to crystallize, spacers and isolators should be used to avoid damaging the measuring components of the pressure measuring instrument. The spacer should be selected from liquids with high boiling point, low freezing point and stable physical and chemical properties. The pressure gauge should be installed as far as possible from heat and vibration to avoid its influence. A shut-off valve should be installed near the pressure tap for use when servicing the pressure gauge.
(3) During maintenance and use, it should be cleaned regularly to keep the pressure guiding tube and pressure gauge clean.