(13 September, 2008)
This is the oldest of the three diffusion pumps that we seem to have here; it was recently given to us.
As you can see, it is designed to pull 700 Watts at 110
V; I have no idea how much fluid it takes, or even what
the proper fluid is.
This pump actually seems to have a gatevalve on it, but I don’t think there’s a roughing pump in the box with it. It appears to have about a 6" throat.
We seem to have a partly-disassembled leak detector. Here are some views of the guts:
The label is scratched up, and a bit difficult to read;
the pump is a [rather old] Edwards SpeediVac 403A. It is
water-cooled, has a 4" throat, takes 100 cc of fluid,
and pulls 500 W at 240 V. (I can make 240 V with a
step-up transformer, and the heater shouldn’t care
about the frequency.) I have checked the heater; it has
reasonable resistance, and is not shorted to the case.
So far, so good.
The surprise about this unit is that there is actually a roughing pump in there as well:
It’s a bit strange, and we will have to replace
the motor if we can; it wants 240 VAC at 50 Hz. I
checked, and the shaft turns freely, so there is at
least some chance that the pump itself is more or less
intact. (There is also a chance that I can get away
with running the motor on 60 Hz power, if I get the
voltage close enough and if there isn’t too
much work for it to do.)
Email: a@b.com, where you can replace b with joss (as in Joss Research Institute), and a with my first name (no “h”, only 3 letters).
Phone: +1 240 604 4495.
Last modified: Tue May 9 13:27:55 EDT 2017