Venting The Vacuum System - Veeco MS40 Operation And Maintenance Manual

Portable automatic leak detector

Table of Contents

To open or close the gas ballast, press the purge momentary switch on the

Service Panel (left side of User Panel). The purge valve may only be opened

when the unit is in "standby" mode (the READY light will be lit on the User

Panel). The ballast should be kept open for a minimum of three minutes to

allow the helium to be completely expelled from the oil. The purge valve will

automatically close after five minutes, or when the START switch is pressed.

The computer will prevent any testing for fifteen seconds after the purge valve

closes. This allows the background level to settle and the computer to update

the background information.

Occasionally, the internal pump's oil will become saturated with helium to the

point that purging with dry nitrogen and "de-gassing" the oil through the gas

ballast will not be entirely effective. If the background and instability

problems are not sufficiently solved through these measures, change the

pump's oil (refer to Section 4.4 for this procedure).

4.6

Cleaning, service and repair of vacuum system components usually requires

the venting of the Vacuum System. Venting is always necessary for removal

of component parts. Service must be performed by adhering to procedures

that minimize the pump down time when the system is restarted (e.g., using

latex gloves when touching internal equipment - without gloves, the

fingerprints left behind are a source of out gassing and contamination that

effect the efficiency of the MS-40).

WARNING!

To Vent the Vacuum System:

Vacuum Instrument Corp.

2099 Ninth Avenue

Ronkonkoma, NY 11779

631.737.0900

1109-186-00 Rev. C