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NO
2/2
D 110
Alcatel Vacuum Technology France - ASM 180 TD/TD+ - ASM 181 TD+ User’s Manual
Helium measurement problem
Edition 04 - September 97
S
YMPTOM
C
AUSE
R
EMEDY
Eliminate the leak
Leak inside the detector
Leak visible during a Helium
leak check.
Clean with alcohol or
replace them if necessary
Vacuum line contamination
The lines are dirty or greasy
NO
Wait for a spectro
pressure < 10
-4
mbar
High triode gauge pressure
Analyzer cell degassing time
too short
NO
NO
Clean and recondition
(
see E 10
)
Cell contamination
The cell is dirty and polluted
High background noise
Jauge PI1
défectueuse
Contact customer service
Ultimate pressure of
MD4E or CP20
The dry roughing pump is
defective
Contact customer service
NO