ALICAT 21 series standard mass flow controller adopts internal compensation laminar flow differential pressure technology, so that the gas can still maintain laminar flow movement in a large flow range. Built-in absolute pressure and temperature sensors fully compensate for the difference between volume flow and mass flow due to pressure and temperature, and correct the user's standard working conditions. Has NIST traceable calibration certificate. It can be used to quickly measure and control the mass flow rate, volume flow rate, pressure of process gas, and display the gas temperature, which is suitable for a variety of flow measurement and control occasions. The equipment uses fast and stable high quality solenoid valve and optimized PID adjustment, which can achieve better than 100 ms control speed and maintain stability, and there are low pressure loss products for you to choose.