Why is pressure stabilization compensation necessary for mass flow meters?
The mass flow meter mainly consists of components such as a mass flow sensor, laminar flow element, flow controller regulating valve, and amplification control circuit. It is made by utilizing the heat transfer effect that changes the temperature distribution of the measuring capillary wall caused by the flowing fluid.
It uses the principle of measuring the temperature difference before and after heat transfer in the capillary to measure the mass flow of gas, unaffected by temperature and pressure. The flow signal measured by the sensor is amplified and then compared with a set voltage. The resulting difference drives the control regulating valve, achieving closed-loop control so that the flow through the channel equals the set flow.
Why is pressure compensation necessary for mass flow meters:
Common flow meters mostly can only directly measure the volume of the fluid and cannot directly measure mass. If only the volume of the fluid under current conditions is measured, the mass flow meter instrument can directly display it. However, if the flow meter is required to display the fluid mass, the result must be obtained by calculating the product of the instantaneously sampled fluid volume parameter and the density parameter (mass = density × volume), rather than directly measuring the fluid mass.
As a flow instrument, the data measured by the mass flow meter must be accurate. When measuring the fluid mass, a problem arises: whether the fluid density is constant. If the fluid density is always consistent, the density parameter can be fixed on the instrument. However, if the fluid density continuously changes, the density parameter must be constantly adjusted according to the current fluid conditions. This adjustment of the fluid density parameter based on fluid conditions during flow measurement is called density compensation.
Pressure compensation refers to adjusting the fluid density value based on the pressure parameter in the fluid conditions. If only one of the temperature or pressure parameters in the fluid conditions is used to adjust the density parameter during measurement, this is called temperature compensation or pressure compensation. However, if both temperature and pressure parameters are used simultaneously to adjust the density parameter, this is called temperature and pressure compensation.
Related Products
The ACU10FDR low differential pressure gas mass flow controller, equipped with a proprietary high-flow electromagnetic valve, is suitable for controlling mass flow in situations with minimal available system pressure. The low differential pressure ensures minimal impact on the system, enabling flow control under near-atmospheric pressure conditions and reducing system response time. We will customize the valve and PID control functions for you based on your application parameters to ensure that the product can achieve fast and stable control while maintaining low pressure loss.
The ACU10FC differential pressure mass flow controller uses a differential pressure mass measurement principle with no thermal drift and no response lag. It can simultaneously display and output: instantaneous flow rate, cumulative flow rate, pressure, temperature, etc. When a control function is required, an electromagnetic proportional control valve and built-in PID control function can be added. Unlike thermal flow meters, the ACU10FC has no additional "specific heat capacity" error when using gas conversion coefficients. Therefore, even if the measured gas is different from the calibration gas at the factory, it will not affect the measurement accuracy.
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