Hello,
It depends on the range that your MFC supports. Look for a label on one of the sides of the MFC that indicates the range. For example if you see 0-100 sccm, it would not support a larger flow. But if it says 0-1000 sccm, then it will. To set the new flow you will need to send a signal in the range of 0-5 Volts, which is linearly proportional to the air flow. In the 0-1000 sccm MFC, a 1-volt signal would give you 200 sccm, 2 volts for 400 sccm, and so on. You can also do fractions of a volt.
In order to send an external voltage, you need to use a pin connector suitable for your model controller and hook it to a controlled DC voltage source, but make sure that circuitry is correctly done. Also, it is possible that you have the kind of MFC that has a little screw on the side that helps you set the voltage manually by turning the little screw on the side. Look at the specs of your instrument to find out what options you have.
Bottom line is: you can adjust your flow continuously within the range of your instrument. If the flow you need is out of range, there is nothing you can do. You would need a larger MFC with larger flow range.
Good luck!
Thank you for your responses.
Although my MFC is calibrated to 20sccm. The 1179A model has a range of 20sccm to 20slm. The MFC can be sent to the company to change the range so I am wondering if there is a way to do this by myself.
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