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Re: mercury batcher
Posted By: SVP Neon Equipment In Response To: Re: mercury batcher (Don Miner)
Date: Friday, 21 May 2010, at 12:03 p.m.
> I once worked at a shop in central New York
> State, where there was a mercury injector as
> illustrated on page 190 in the third edition
> of Samuel Miller's book, NEON TECHNIQUES
> & HANDLING. The device worked very well
> and was consistent in mercury injection. It
> was attached to the manifold backboard and
> did not just hang in space. Stable, safe and
> secure. To prevent mercury stains on
> seal-off, I would leave about 2 inches of
> tublation on the unit until the mercury was
> moved away from the seal-off area. Otherwise
> the unit might turn out to be "stain
> city".Most were not mounted as you describe. Being mounted the way you mentioned means only one unit at a time could be processed unless there were two of them side-by-side with excessive lengths of tubulation, which dramatically slows down pumping speed.
The ones I have seen and worked with were far from trouble free. How did you keep the steel plunger, which was made from common tooling steel, from contaminating the reservoir of mercury? The picture in Miller's book refers to it as an "iron plunger", which would also contaminate the mercury. That was one of the predominant problems with them. Another was, once the plunger became "crusty" (for lack of a better word) from the contamination, it had a tendency to stick in the "up" or "open" position, which would allow mercury to literally pour into the tubulation. Sometimes the plunger solenoid would not disengage, which also allowed the mercury to pour into the tubulation.
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