AquaMist pump (was: Re: Voltage controller)

[Ken Kelly]

The earlier poster said that the Pump had a mechanical
arrangement that worked like a bicylce pump. The voltage
cocked the pump, and a spring returned the pump to the
resting position. If this is true, only the spring constant
determines the output pressure.

		Ken

Daniel Houlton wrote:
> 
> John Andrianakis wrote:
> >
> > Havent followed all the messages of this thread but I think you should know
> > that erl does not alter the water output by changing the pump supply
> > voltage. They use a solenoid valve controlled by their MF-2 injector
> > controller. The pump is specialy designed magnetic piston unit and I could
> > guess that it operates at a frequency of around 10Hz.
> > Regards,
> > John Andrianakis.
> >
> 
> Just to clarify, I'm not trying to modulate the supply voltage that powers
> the pump.  I'm trying to control the voltage level to the 0 - 12V signal
> input (this is seperate from the 14V power input).  This appears to be what
> the MF-2 does.  Sends a variable voltage 0 - 12V depending on how much to
> pump and the internal circuitry of the pump does it's thing to pump that
> amount, most likely PWM'ing the 14V power supply itself.
> 
> I'm assuming that it's linear as well.  0V => no pump, 6V => 50% d.c.,
> 12V => 100% d.c. etc.
> 
> --Dan