Calibration is critical. Let’s say you think your flow rate is 200 CC per minute, but you have not calibrated the mass flow controllers. You manufacture a large quantity of preforms, and one of your mass flow controllers fails. You buy and install a new controller and set the flow for what you thought it was. However, it turns out your actual flow rate was not 200 CC per minute. The preform cannot be reproduced. You need to start over, experiment, and change flows until you achieve the desired optical properties. Meanwhile, time and materials are lost. Knowing your absolute flow rate at all times is critical. I recommend SG Controls’ automated calibration software interface to ensure a high level of assurance for this critical step in the process.

 

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