Measurement Principles of Different Gas Meters
1. Diaphragm Gas Meter (Basic principles of mechanical, IC card diaphragm, and remote transmission diaphragm meters)
Volumetric Measurement: Diaphragm gas meters have a flexible diaphragm inside, separating the measuring chamber into two spaces. Under the action of pressure difference, the gas alternately enters the measuring chamber through a distribution valve, pushing the diaphragm to move back and forth. Each movement of the diaphragm discharges a fixed volume of gas. A conversion mechanism converts the diaphragm's movement into mechanical transmission, driving a counter to record the gas consumption.
Dual Measuring Chamber Design: To improve measurement accuracy and continuity, modern diaphragm gas meters usually have two measuring chambers. Gas alternately enters the two chambers, ensuring a balanced range of gas input and output, reducing measurement errors.
2. Ultrasonic Gas Meter
Ultrasonic Propagation Principle: Utilizing the propagation characteristics of ultrasound in gas, the gas flow rate is calculated by measuring the time difference of ultrasonic waves propagating in the forward and reverse directions. Based on the flow rate and pipe cross-sectional area, the gas flow rate can be determined, and the cumulative gas consumption can be calculated.
No Mechanical Moving Parts: Ultrasonic gas meters do not rely on mechanical parts for measurement, reducing mechanical wear and failure risks, and offering high accuracy and reliability, suitable for scenarios requiring high measurement accuracy.
3. Turbine Gas Meter
Turbine Rotation Principle: When gas passes through the meter body, it pushes the turbine to rotate. The rotation speed of the turbine is proportional to the gas flow rate. A magnetoelectric conversion device converts the turbine's rotation signal into an electrical signal, which is then processed to display the gas flow rate and cumulative consumption.
Suitable for Large Flow Measurement: Turbine gas meters are suitable for measuring large gas flows and are commonly used for commercial and industrial users. They can quickly respond to flow changes and provide accurate measurement data.
4. Roots Gas Meter (Lobe Gas Meter)
Lobe Rotation Principle: The meter body has two lobes, which are rotated by the gas. The rotation of the lobes is transmitted to the counter through a transmission mechanism, recording the gas consumption. The number of rotations of the impeller is directly proportional to the gas flow rate. The cumulative gas consumption can be determined by calculating the number of impeller rotations.
High precision and stability: Roots gas meters offer high measurement accuracy and stability, making them suitable for applications requiring high measurement precision, such as large industrial and commercial users.
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