I heard that the reason for the large measurement error of the glass rotor flowmeter has something to do with the dog days of more than 40 days this year.

  I believe everyone knows the use of flowmeters and knows that the measurement error of the glass rotor flowmeter will be too large or too small, but do you know the reasons for such a value? I heard that it will have something to do with the dog days of more than 40 days this year? Does it really have an effect on temperature and pressure? Follow me to find out.

  The selection and use of flowmeters, rotameters and glass rotameters have summed up their own experience. Let's talk about the factors that increase the error of rotor type float type flowmeter manufacturers.

  1. The gas medium is greatly affected by temperature and pressure

  The flowmeter is calibrated before leaving the factory. The flow scale is calibrated according to the temperature and density of the medium provided by the user. The gas medium is greatly affected by the temperature and pressure, so the user needs to provide accurate and commonly used temperature values.

  2. The density of the liquid medium varies greatly

  Before the calibration of the flow meter, the medium is converted according to the density given by the user, and it is converted into the flow rate of water in the calibration state for calibration. Therefore, if the density of the medium changes greatly, it will cause a great error in the measurement. Solution: The changed medium density can be brought into the formula, converted into an error correction coefficient, and then the flow measured by the flowmeter is multiplied by the coefficient to be converted into the real flow.

  3. Long-term use and pipeline vibration

  A variety of factors cause the moving parts such as the sensing magnet, pointer, counterweight, and rotating magnet to loosen, resulting in large errors. Solution: You can first verify by pushing the pointer by hand. First, press the pointer at the RP position to see if the output is 4mA and whether the flowmeter shows 0%, and then verify according to the scale. If discrepancies are found, the parts can be repositioned.

  4. Installation does not meet the requirements

  The general float flowmeter is installed vertically, and the inclination angle of the flowmeter cannot exceed 20 degrees during installation. Of course, some rotameters are installed horizontally. For horizontally installed rotameters, the inclination angle should not be greater than 20 degrees. This editor warmly reminds the majority of users that there must be no ferromagnetic objects in the 100mm space around them.

  After understanding the above factors that cause errors, it will be very helpful for future use. If you have other things that you need to add to the above, please feel free to call and consult. There is also our 24-hour customer service online, which can solve all flowmeter faults for you at any time, and what kind of flowmeter knowledge you want, quickly Come and communicate with me privately.