Pressure gauge in the work of the note

Update:16 Oct 2017
Summary:

   (1) range of pressure in the boiler, pressure vessel […]

   (1) range of pressure in the boiler, pressure vessel on the pressure gauge, the maximum range (dial on the scale limit) should be compatible with the equipment working pressure. Pressure gauge range is generally the equipment working pressure of 1.5-3 times, it is best to take 2 times. If the choice of pressure gauge range is too large, due to the same precision of the pressure gauge, the greater the range, allowing the absolute value of the error and the greater the deviation of the naked eye observation, it will affect the accuracy of pressure readings; the other hand, if the choice of pressure gauge If the working pressure of the equipment is equal to or close to the scale limit of the pressure gauge, the elastic element in the pressure gauge will be in the maximum deformation state for a long time, which will produce permanent deformation, and the error and service life of the British pressure gauge will be reduced. In addition, the gauge range is too small, in case of overpressure operation, the pointer across the maximum range close to zero, leaving the operator illusion, resulting in greater accidents. Therefore, the use of pressure gauge pressure range should not exceed the scale limit of sixty to seventy percent.
   (2) The accuracy of the working pressure gauge is expressed as a percentage of the allowable error to the dial scale limit. Accuracy levels are generally on the dial, the choice of pressure gauge, the pressure level should be based on the equipment and the actual work needs to determine the accuracy.
   (3) Diameter of dial In order to make the operator accurately see the pressure value, the pressure gauge dial diameter should not be too small, if the pressure gauge is installed higher or away from the post, the diameter of the dial should be increased.
   (4) pressure gauge for the measurement of the media if corrosive, it must be based on the specific temperature of corrosive media, concentration and other parameters to use different components of elastic materials, or fail to achieve the desired purpose.
   (5) daily attention to the use of maintenance, regular inspection, cleaning and make use of the record.
   (6) pressure gauge general test cycle for six months. Compulsory test is to ensure that the pressure gauge technical performance is reliable, the amount of accurate delivery, effective guarantee of safe production of legal measures.

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