Dave,

Check the O-rings (drain and fill)!

Moving the Prism probably meant switching it off. 
When the O-ring cool down become brittle, and 
more frequently than not do leak.

If as said you have checked all the obvious, that would be my best bet.

Clemente



>We recently moved our '89 vintage PRISM and 
>cannot get high vacuum back again.  The analyser 
>has pumped out normally to 1e-3 mbar but the 
>diff pumps just will not trip back on. 
>Everything seems 'normal' ie all power supplies 
>on, fuse by the rocker switch is OK etc etc. Has 
>anyone experienced this, or know of potential 
>problem areas (sticking relays, faulty switches 
>etc) before I am forced to dust off the 
>schematics?
>
>Thanks for  any help!
>
>dave
>
>
>
>-----------
>Dave Mattey BA PhD FRAS
>Professor of Stable Isotope Geochemistry,
>Department of Geology,
>Royal Holloway College,
>University of London,
>Egham Hill,
>Egham,
>Surrey,
>TW20 0EX
>
>Telephone  
>
>01784   443587 (direct line)
>         443582 (dept secretary)
>07780   697564 (mobile)


-- 


*******************************************
Dr. Clemente Recio
Laboratorio de Isótopos Estables
Fac. de Ciencias
Univ. de Salamanca
Plaza de la Merced, S/N
E-37008 SALAMANCA
               SPAIN

Phone: (+34) 923 29 45 00, Ext. 1540 (Automatic Switchboard)
Fax:     (+34) 923 29 45 14
E-mail: [log in to unmask]
Web page: http://www.usal.es/isotopos
*******************************************