Dear all


I have changed 3 rotary pumps in my MS by 3 brand new Edwards RV5 filled
with Edwards Ultra grade 19 pump oil.  Although the vacuum is fine, the oil
presents bubbles, giving it a "foammy aspect".  These bubbles disappear when
the pump is turned off. Does anybody know if this is a normal behaviour, or
if something is wrong?
Operating the gass ballast produced no changes.

Thank you in advance,

Héctor O. Panarello
Director
INSTITUTO DE GEOCRONOLOGÍA Y GEOLOGÍA ISOTÓPICA (INGEIS) Pabellón INGEIS -
Ciudad Universitaria
1428 Ciudad de Buenos Aires
Tel: +54-11-4784 7798
Fax  +54-11-47833024