One minute learn how to select gas Roots flowmeter
2021-07-07
Gas Roots flowmeter is often used in catering, hotels and other industries of gas commercial accounting, transmission and distribution network gas metering, gas regulator station metering, industrial and civil boilers and other gas metering, can also be used as propane, butane, air, nitrogen, industrial inert gas and other non-corrosive gas standard flowmeter. Based on the volumetric measurement principle, the gas roots flowmeter has high accuracy, large flow range, compact structure, no straight pipe section at the entrance and outlet, can be installed in the narrow environment, and can adapt to the harsh climate environment to measure the gas flow with large load changes. Long-term use does not require adjustment, is not affected by changes in medium conditions, small pressure loss, long working life, easy installation and use. When selecting the type, it is necessary to clearly measure the diameter of the pipeline, the measuring medium, the temperature of the medium, the working pressure, the working flow, the upper limit and the lower limit of the working flow, as well as the output, power supply, structural form and other parameter information.
Gas roots flowmeter selection precautions
1.pipe diameter and scope of application: gas Roots flowmeter is suitable for a wide flow range requirements, low starting flow occasions. In the selection, it is necessary to clarify the lower limit, upper limit and normal working flow of the measured pipeline gas in the actual work. According to the pipe diameter and flow range comprehensive consideration of the selection of flowmeter specifications. Usually, when the diameter of the pipe is inconsistent with the flow range, the flowmeter specifications are determined by the diameter of the pipe that the flow range meets.
2.working pressure, because of different working pressure conditions, the flow of gas will change, selection, the working pressure of the medium needs accurate information.
3.the choice of structural form: intelligent digital display type: can evaluate the pressure compensation within the range of 0-200KPA, 0-40℃ temperature compensation. Output pulse signal, IC card control signal, 4-20MA current signal. Temperature and pressure compensation type: temperature and pressure real-time compensation, dual power supply, can output pulse signal, current signal, IC card control signal.
Gas roots flowmeter installation precautions
Horizontal installation or vertical installation can be used, conventional vertical installation. When vertically installed, the medium inlet is above, and the air flow is from top to bottom. This installation method makes the rotor have self-cleaning ability for dirt. When the flow meter is installed horizontally, the axis of the import and export end of the flow meter shall not be lower than the pipe axis, so as to avoid the dirty impurities in the medium remaining in the metering chamber of the flow meter and affecting the normal speed. The upstream of the flowmeter must be configured with a filter during installation, which has improved the purity of the medium. It is recommended to install a steel expander behind the flow meter. When the flow meter is used outdoors, it is recommended to add a protective cover to avoid rain immersion and sun exposure and affect the service life of the flow meter. There can be no strong external magnetic field interference and strong mechanical vibration around the gas Roots flowmeter. After installation, the gas Roots flowmeter needs to be reliably grounded and cannot share ground cables with the strong current system.
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