Natural gas Roots flowmeter | Types and principles of flowmeters

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1. How to read an old gas meter

How to read a gas meter correctly

1. Read the black marked numbers on the gas meter in order from left to right, ignoring the decimal places marked in red

2. The gas meter consists of a measuring mechanism, a counter, and a display device, used to measure and display gas usage. It is widely used in gas fields such as natural gas and liquefied petroleum gas. Measurement institutions usually use turbines or Roots flow meters with keying to determine flow rate by calculating gas flow rate and time. The counter records readings, which can be mechanical or electronic, while the display device displays the readings in numerical or pointer form to the user. Gas meters are divided into natural gas meters, liquefied petroleum gas meters, and gas meters according to the type of medium; According to the installation location of the bright object, it can be divided into indoor and outdoor meters; According to the measurement principle, it can be divided into volumetric and velocity types. Volumetric gas meters calculate flow by measuring gas volume, while velocity gas meters use turbine or Roots flow meters. When using gas, the following precautions should be taken: 1. Safe use of gas stoves: choose stoves that meet safety standards and avoid using inferior products. Adjust the ignition source during use to prevent accidents caused by soup overflow. After use, be sure to close the gas valve. 2. Regularly check the gas facilities, including pipelines, valves, and gas meters. If any problems are found, contact professional personnel for repair or replacement in a timely manner. Do not disassemble or modify them without authorization. 3. Pay attention to gas leaks: if a leak is fou

2. Types and Principles of Flowmeters

Types and Principles of Flowmeters Flowmeters Flowmeters are instruments used to measure fluid flow in pipelines or open channels. There are many types, which can be classified into multiple types based on different measurement principles and structures.

1. Classification according to measurement principles. Mechanical principles. Differential pressure flow meter: Using Bernoullis theorem, the flow rate is calculated by measuring the differential pressure of the fluid in the pipeline. For example, orifice flow meters, wedge flow meters, Venturi tube flow meters, etc. These flow meters typically consist of a primary device (such as a throttling device) and a secondary device (display instrument), which calculate the flow rate by measuring the pressure difference of the fluid before and after the throttling device. Rotary flowmeter: Using the momentum theorem, the flow rate is reflected by measuring the speed at which the fluid drives the rotor to rotate. The rotor (float) rotates or rises and falls with the flow of fluid in a conical channel, and its position change is proportional to the flow rate. Turbine flowmeter: Using the angular momentum theorem, the fluid flow rate is determined by measuring the rotational speed of the turbine blades. The turbine rotates at high speed under the propulsion of fluid, and the rotational speed is proportional to the flow rate. Vortex flowmeter: Using the principle of fluid oscillation, the

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