Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 252 / 426

Performing a Blank Analysis for Diagnostic Purposes Gemini VII
9-26 239-42828-01 - Dec 2012
Performing a Blank Analysis for Diagnostic Purposes
A blank analysis is a means of pinpointing operational problems in the analyzer. Leaks, as well as elec-
tronic problems, will result in an unsatisfactory blank analysis. This test should be performed prior to
detailed troubleshooting. The data produced during the blank analysis can be very helpful in identify-
ing the cause of a problem and should be performed before contacting your Micromeritics Service
Representative.
Helium is required for performing a blank analysis since a measured free space is required. If helium is
unavailable, contact a Micromeritics Service Representative for an alternative method of performing
this procedure.
1. Install empty, straight-wall sample tubes (free of cracks or chips) of the same size in the sample
and balance ports. Ensure the O-rings are present and in good condition.
2. Place the Dewar support on the elevator, then place a Dewar of water at ambient temperature on
the Dewar support.
A Dewar support is not necessary for the larger Dewar used with the Gemini VII 2390t. Place the
Dewar directly on the elevator.