The circuit diagram of the Lexus SC400 alarm system in 1996 is as follows: Welcome to reprint, information source Huaqiang Electronic Network () The mass flow meter does not measure the volume per unit time (e.g. cubic meters per second) passing through the device; it measures the mass per unit time (e.g. kilograms per second) flowing through the device. Volumetric flow rate is the mass flow rate divided by the fluid density. If the density is constant, then the relationship is simple. If the fluid has varying density, then the relationship is not simple. For example, the density of the fluid may change with temperature, pressure, or composition. The fluid may also be a combination of phases such as a fluid with entrained bubbles. Actual density can be determined due to dependency of sound velocity on the controlled liquid concentration. Gas Mass Flow Meter, Thermal Gas Flow Meter, Mass Flow Meter Kaifeng Chuangxin Measurement & Control Instrument Co., Ltd. , https://www.kfcxflowmeter.com