20 Dec
2000
20 Dec
'00
8:30 a.m.
I have a TU10 that has worked, generally, for the 10
years since I got
it. However, earlier this year it failed, with problems during the load
sequence.
I have traced the problem to failed (and nearly failed) vacuum
sensors. The two "fail safe" sensors at the bottom of the two columns had
both failed (I suspect because during operation they were always in a low
pressure state), and one of the other sensors near the bottom of one column
had also failed. I suspect at least one more failure is imminent.
(The test is easy: if you can suck air thru it, its bad. ;-) I suppose
there is some kind of diaphragm in there which gets a hole it in when it
breaks).
Yup... good old rubber baloon material (or something like that).
Micro Pneumatic Logic, P/N MPL 503. (These guys still
exist! So I am
sending them an e-mail. But new ones are bound to be pricey).
Thanks in advance for any help.
Jay
I'm not sure -- the 503 looks like the best bet.
It looks like a direct replacement.
Here's a few others
http://www.presair.com/presvac.htm
http://www.whitmancontrols.com/catalog/
http://www.majestic-controls.com/huba.html
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