Hi,

I will be measuring the flow rate at the device's outlet in any case.
I would have done that even if I had a suitable mass flow controller,
in order to calibrate it with retards to the outgoing gas.

m

On 10/11/10, Brian Stahl  wrote:
> Full disclosure: my experience with peristaltic pumps is limited to
> low-viscosity liquids.  Peristaltic pumps will create a pulsatile flow,
> which may be important depending on application specifics.  The factors I
> see as being most important are the back pressure at the pump outlet and the
> inlet pressure from your gas source.  Peristaltic pumps can generate
> significant output pressures (depending on the working fluid).  If your gas
> source is a pressurized cylinder with a regulator and your pump inlet
> pressure is different from the outlet pressure you will have to do a
> conversion to find the outlet volumetric flow rate.  But I am not aware of
> any thermodynamic reasons why you can't pump a gas with a peristaltic pump,
> and your gas selection should only be limited by the type of tubing you use.
>  I hope this helps (or at least doesn't cause further confusion).
>
> Best regards,
>
> Brian C. Stahl