KIN-TEK Analytical
The 491Flex Calibration Gas Standards Generator (photo) is an update of the 491M manual system, retaining the modular construction and expandability of the previous model, but replacing the analog controls with the computer-controlled FlexStream system. Other features include capabilities for automation and expandability, as well as electronic mass-flow control and full PID temperature control. The 491Flex uses permeation (or diffusion) tubes as the component compound source for creating very low-concentration mixtures. — KIN-TEK Analytical, La Marque, Tex.