Environics - Model 3000 Series - Biological Atmosphere Incubation Gas Mixers - Manual

This system has been designed to dilute 100% CO2 with air to an output concentration of 5%. The main controls of the system are HMI (Human Machine Interface); color touch screen and PLC combined. A series of I/O modules connect to all the electro-mechanical devices. Precision mass flow controllers (MFC) are used to control the flow rate of each gas for blending. A 40 SLPM MFC is used for air and a 2 SLPM MFC is used to control the flow of CO2; refer to the P&ID at the end of this document. Each MFC was calibrated at 11 points by Environics, for linear and accurate flow throughout the range. The 11 point calibration curve is stored in the software of the PLC. As the system is used to blend the two gases, these look up tables are used to improve the accuracy of the blender, using the mathematical algorithm linear interpolation.