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Transpector MPH Operating Manual
6.6.1.2.2 Selecting Masses for Tuning with an Argon Standard Calibration Reference
The argon standard calibration reference includes only argon. To tune with this
reference, the emission must be set to high (70 eV). This will generate peaks at
20 and 40. Do not tune mass 1, 2 or 4 if using the argon standard. Remove all of
the masses above mass 4 and add 20 and 40 then tune these masses.
NOTE:
Argon calibration references are not recommended for tuning a 200 or 300
AMU Transpector MPH.
6.6.1.2.3 Selecting Masses for Tuning with a User-Supplied Test Mix
In some applications, it can be useful to have a test mix manufactured by a gas
supplier. The ideal mix would include the factory tune masses for the mass range
of Transpector MPH to be tuned. The factory tune masses can be found in
.
6.6.1.2.4 Selecting Masses for Tuning with Process Gases
In general, Transpector MPH tuning requires access to a low mass, a mid mass
and a high mass.
Do not tune mass 1 or 2 if hydrogen is not present in the process, but
do not delete
them from the tune table
.
Preferably, mass 4 should be tuned especially if Transpector MPH is used for leak
checking. One way of doing this would be to create a leak and spray in helium. This
will satisfy the low mass.
For a mid mass, try to use nitrogen or another mass in that area (water,
oxygen, etc.).
Tuning higher masses can be more difficult.
If the process does not contain gases with masses over 40 AMU, tune with
argon
If the process does contain gases with higher masses
Tune one between the mid mass and 100 AMU for 100 AMU sensors
Tune one mass between 100 and 200 AMU for 200 AMU sensors
Tune another mass above 200 AMU for 300 AMU sensors