What are the precautions for the use of elliptical gear flowmeters?

1. The direction of installation of the instrument should be such that the direction of the arrow shown on the instrument housing is consistent with the direction of liquid flow. The installation position should be convenient for reading.
2. The instrument should be installed at room temperature as much as possible. Do not install it in the place of harmful gas and strong heat radiation to prevent the instrument counter from being damaged.
3. The asphalt shaft in the instrument should be installed in a horizontal position as much as possible, that is, the dial should be installed in a vertical position (the indexing “0” should be on the top) to reduce the friction between the asphalt gear and the casing and reduce the wear of the parts. Due to the different mounting positions, the counter (head) can be rotated 90° or 180° for easy reading.
4. Before the instrument is installed, the pipeline must be thoroughly cleaned. If there is no strict filtration device in the whole pipeline system, the filter should be installed in front of the instrument to prevent impurities from entering the watch.
5. The meter should be installed at the outlet end of the pump, and the flow regulating valve should be installed downstream of the meter. Open the upstream shutoff valve first, then slowly open the downstream flow regulating valve or shutoff valve. It is strictly forbidden to suddenly open or close.
6. When the meter is in use, the meter should be filled with liquid. The gas to be tested should not be mixed with gas. Otherwise, the mixing volume of gas and liquid should be measured to make the measurement inaccurate. When the gas is mixed in the liquid, the gas separator must be installed upstream of the meter.
7. The flow rate in the pipeline should not increase or decrease sharply. Pipe vibration, hydraulic shock and pressure fluctuations should be avoided. Otherwise, the normal operation of the instrument will be affected.
8. When the flow rate exceeds the specified maximum flow rate, the asphalt increases wear with the increase of the rotational speed, and the pressure loss increases sharply, which should be avoided. Below the minimum flow, although it can still be measured, the error increases. The starting flow rate of the flow meter is about 2% of the maximum flow rate, and the normal working flow rate is 70%-80% of the maximum flow rate.
9. When measuring high viscosity liquids, the liquid is generally heated to lower the viscosity and then circulate in the pipe. When the meter is deactivated, the liquid filled in the meter becomes sticky due to cooling. If it is to be activated, it must be heated outside the watch body by steam or other methods to reduce the viscosity of the liquid and to be used after the viscosity of the liquid in the meter is lowered. Otherwise, the mucus will bite the transmission parts, causing damage to the meter.
10. The temperature of the liquid to be tested should not be higher than the specified value. Otherwise, the meter will not work normally and may even get stuck. Changes in liquid temperature can also cause additional errors in viscosity effects. In addition, the increase in temperature also causes the volume of the crescent space to increase, which is the instrument "goes slow", the measuring chamber is cast iron, and the elliptical gear is cast aluminum with an additional error of +0.14%/100 °C.
11. When each instrument is shipped from the factory, it is calibrated with No. 7 mechanical oil at room temperature. At normal temperature, the viscosity of the oil is about 10mpa.s. If the viscosity of the liquid used by the user differs greatly from this, the double-layer gear can be changed.
12. It is strictly forbidden to sweep steam and water through the instrument.

Jiangsu Andel Automation Instrument Co., Ltd.

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