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Transpector XPR 3+ Operating Manual
7.5.2 How to Determine if a Filament Kit Replacement is Required
Follow these steps to determine if a filament replacement is required.
1 Measure the filament resistance. This can be accomplished while the sensor is
under vacuum by measuring the resistance between pins G and E. (See Figure
7-2.) A failed filament will measure open. An intact filament assembly will read
approximately 0.5
Figure 7-2 Transpector XPR 3+ sensor pin location
NOTE: Although the following measurements may measure below 30 M with the
filament assembly and ceramic shield in place, they must be above 30 M
when measured with the filament assembly and ceramic shield removed.
2 Measure the resistance of each of the pins with respect to ground (pin A).
These measurements should be above 30M.
3 Measure the resistance of each of the pins with respect to each other. All of
these measurements should also be above 30M, with the exception of across
the filament if the filament has not failed.
7.5.3 Filament Kit Replacement
A filament replacement kit can be purchased from INFICON. This kit contains a
new filament assembly mounted on a shipping fixture and a small Allen wrench.
Perform the following steps to replace the filament.
NOTE: Refer to section 7.5.1, Tools Required, on page 7-4, before continuing.
Key Pin
F - HV Out
G - Filament
H - Anode Lead
I - Extractor
J - RF1 Lead
Signal Contact
E - Filament
D - Total
Pressure
C - HV (EM)
NC (FC)
B - RF2 Lead
A - Ground Lead
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