Dongguan Huayuan Electronic Technology Co., Ltd , https://www.zjsiliconefactory-oem.com
Oval gear flowmeter installation and precautions
The elliptical gear flow meter is a precision meter used to measure the flow of liquid. It is a direct-reading accumulative meter. It is a volumetric flow meter that measures the sum of the liquid flows through the pipeline. The product uses two kinds of counting mechanisms: mechanical display head and electronic display meter. The display head has the functions of displaying cumulative flow, instantaneous flow and zero return, which can realize on-site display and remote transmission control.
Installation of elliptical gear flowmeter
1. Thoroughly clean the pipe before installation and install a filter in front of the flowmeter to prevent debris from entering the flowmeter. When the liquid to be tested contains gas, an air separator should be installed.
2. It should be noted that the elliptical gear shaft of the flowmeter must be placed in a horizontal position, that is, the dial is perpendicular to the ground plane. Regulate the flow and start, the closed valves should be installed at the inlet and outlet of the flowmeter.
3. The arrow on the flowmeter housing should be aligned with the flow direction of the liquid being installed.
4. For the pipeline of continuous flow, the horizontal pipeline for installing the flowmeter should be equipped with a bypass valve for regular cleaning and overhaul. The flow meter on the vertical pipe should be installed in the bypass pipe to prevent debris from falling into the instrument.
5, the flow meter under the correct installation conditions, in order to facilitate reading, the counter can be rotated 180 ° or 90 ° as needed
Note on the elliptical gear flowmeter
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 elliptical gear shaft in the instrument should be installed in a horizontal position as much as possible, that is, the reading plate should be installed in a vertical position (the front of the counter is parallel to the ground) to reduce the friction between the elliptical gear and the housing 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 elliptical gear 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 reduce the viscosity and then circulated in the pipeline (both with a jacketed flowmeter). 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, or even stuck, and the counter part will be easily damaged at high temperature. Changes in liquid temperature can also cause additional errors in viscosity effects.
11. When each instrument is shipped from the factory, it is calibrated with 0# diesel at room temperature. At normal temperature, the viscosity of the oil is about 3mpa.s. If the viscosity of the liquid used by the user differs greatly from this, the gear ratio or flow coefficient needs to be adjusted.