Micromass Quattro Ultima, User Manual

Page: 179 / 227

Vacuum Leaks
If a leak is suspected, the following basic points may help to locate it:
•
Leaks very rarely develop on an instrument that has been fully operational.
Suspect components that have recently been disturbed.
Leaks on flanges can usually be cured by further tightening of the flange bolts
or by replacing the seal.
•
All seals are made using O rings. When refitting flanges pay attention to the
condition of O rings. Any that are cut or marked may cause a leak. The O rings
should be clean and free from foreign matter.
A hair across an O ring is sufficient to prevent the instrument pumping down.
•
Source components that operate at, or slightly above, atmospheric pressure are
not susceptible to vacuum leaks.
In the unlikely event of a leak on a feedthrough, then the unit should be replaced or
returned to Micromass for repair.
Pirani Gauge
The Pirani gauge head does not require routine maintenance.
Active Inverted Magnetron Gauge
For information on cleaning the active inverted magnetron (Penning) gauge, refer to
the Edwards literature supplied with the instrument.
Maintenance and Fault Finding
Page 179
Quattro Ultima
User's Guide