Mass Flow Controller Upgrade

18 07 2011

All photos.

Today I upgraded the Mass Flow Controller (MFC):

Previously I used a 9V battery + a potentiometer as a quick hack to control the MFC.

For the sake of fewer parts I wanted to remove the battery from the circuit. The power supply for the MFC provides +15V, which is way over the 0 to +5V I need to control the MFC.

To prevent over voltage I used a TVS diode which shorts to ground above +6V.

It seems to all work! Don’t have to worry about a dead battery now.

Schematic:

 

The hard part is the craftsmanship needed so it won’t short out. Work in progress:

 

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