Sierra Instruments” Max-Trak Model 180 industrial gas mass flow controller is a NEMA 6 (IP67)-compliant unit that offers accuracy of 1 percent full scale and repeatability of 0.2 percent full scale. Coupled with Sierra”s patented Dial-A-Gas technology, the system supports 10 gases in a single instrument. Controls gas flows from 400 to less than one slpm and is only five inches long and offers both digital and analog communication.