15 - 40
IPN 074-397-P1G
HAPSITE Smart Operating Manual
15.8 Replacing the Ionizer of the Mass Spectrometer
The ionizer is located in the mass spectrometer vacuum manifold behind the NEG
Pump, or a blank off plate if a NEG Pump is not installed. The NEG pump must be
removed in this procedure. If a NEG Pump is installed, the NEG Pump can be
reinstalled and re-activated. Some lifetime of the NEG Pump will be lost during this
process. If a NEG has greater than 50 hours (approximately 1/2 the expected life)
the more economical choice may be to replace the pump, based on the reduced
lifetime after exposure to atmospheric pressure.
Tools/equipment required
Flat head screw driver
Ionizer removal tool
13 mm open end wrench
13 mm torque wrench.
methanol
lint free cloth
powder free gloves
replacement aluminum seal ring (if NEG is to be installed)
If the NEG is to be reinstalled, the NEG Pump must be
removed when it is at room temperature. If the NEG Pump
has been used within 8 hours, let it cool overnight prior
to removal.
1 This procedure requires the use of a Service Module. The HAPSITE should be
physically on the Service Module and attached. Refer to section 2.7, Service
Module, on page 2-18 and Chapter 14, Service Module for more information on
setting up and using the Service Module.
2 If the NEG Pump is hot from recent use, let the system cool overnight before
performing this procedure. Refer to section 15.7.2, Part 1: NEG Pump
Removal, on page 15-17.
Do not bypass this cool down step!
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