The glass rotor flowmeter is easy to install, simple to use, and affordable, making it widely popular. But when there is an error in the measurement of the glass rotor flowmeter, it is undoubtedly a headache. Sometimes customers may find that the measurement error of the glass rotor flowmeter is large after using it for a period of time. What are the reasons for this?
1. Installation does not meet the requirements
Generally, glass rotor flow meters are installed vertically, and the inclination angle of the flow meter should not exceed 20 degrees during installation.
Of course, some float flow meters are also installed horizontally. For horizontal installation of float flow meters, they should be kept horizontal and the inclination angle should not exceed 20 degrees. There should be no ferromagnetic objects in the 100mm space around the float flowmeter. The installation position should be far away from valve reducers, pump outlets, process pipeline bends, etc. To maintain the requirement of a straight pipe section of 5D in the front and 10D in the back.
2. The density of liquid medium varies greatly
Before calibration, the instrument converts the medium to the density given by the user, and converts it to the flow rate of water in the calibration state for calibration. Therefore, if the medium density changes greatly, it will cause significant measurement errors. The solution is to input the changed medium density into the formula, convert it into an error correction factor, and then multiply the flow rate measured by the flowmeter by the factor to obtain the actual flow rate.
3. Gas media are greatly affected by temperature and pressure
Flow meters are calibrated before leaving the factory, and the flow scale is calibrated according to the temperature and density of the medium provided by the user. Gas media are greatly affected by temperature and pressure, so users need to provide accurate and commonly used temperature values.
4. Improper use.
The operator should read the instruction manual carefully before use. When opening the valve, be sure to slowly open it. If it is estimated that the flow can float the rotor but the rotor does not move upward, stop immediately and continue opening the valve. At the same time, gently tap the pipeline to allow the rotor to slowly rise. Many operators opened the valve too forcefully, causing damage to the glass tube inside the glass rotor flowmeter when the new equipment was just installed.