Mass Flow Controller Online

21 10 2009

Big day. Big win. Big upgrade.

Got the mass flow controller online!


First we got a +/- 15V power supply on eBay for $30:

IMG_4315Real nice Lambda. 3.3 Amp.

Wire up the AC side:IMG_4319

Solder the pins on the 9 pin Dsub – data cable on the left, power on the right:


The MFC draws 60 mA. The MFC’s pinout:


Physically install the MFC:


This required a female to female VCR fitting seen to the right of the MFC. It’s pretty securely connected with just the VCR. Stuart suggested installing the MFC upside down to reduce the chance of knocking it downward.

Here it is fully installed:


And it works! First try. Here I have adjusted the chamber pressure to even numbers:


When I am running at full flow, the chamber reads 1.9 e-2 torr.



One response

6 06 2010
QUADRUPLE BUBBLE!!!! « Prometheus Fusion Perfection

[…] computer control I needed some way to manually adjust  the MFC. I hacked together a quick voltage divider using a 2KΩ potentiometer and a 9V […]

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