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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
.) 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