SMT Exhaust Vacuum Monitor

2017/2/27 21:17:30

Does anyone use or have any simple wave/reflow oven exhaust monitors with a visual check (LED).

I was going to design something crude resembling a fan with an electric winding (electric motor of sorts)and a load (resistor maybe with a transistor if needed) attached to an LED.

I would need something that wouldn't activate the LED at low RPMs (due to heated air causing convected air flow) but would illuminate at higher RPMs signifying that the vacuum created suction is present.

If there aren't plug and play devices that are like this does anyone have any good sources/vendors that may have something close to the fan/winding assembly?

It essentially is a small windmill generator if that helps visualize what I need.