Max300-LG : Description - Specifications - Installation Guide
Extrel
Core Mass Spectrometers
Page 33
be used to hold the copper gasket in place. Initially tighten the bolts finger tight. Use an
ohm meter to verify that each of the three detector electrical leads is isolated from each
other, from ground and from the quadrupole.
Note: It is normal for the high voltage connection to show 80 megohms when measured
to ground.
Once verified that the wiring is correct, tighten the flange bolts in a cross pattern. Start
the turbo and roughing pump. When both are working correctly, attach the preamp to the
flange and re-install the preamp and multiplier HV cables.
Changing the "QuickInlet"
To change the "QuickInlet", the first step is to properly vent the vacuum system. Please
refer to the beginning of this chapter for a detailed explanation of the venting procedure.
Tools Required:
(1) ¾ inch Open End Wrench (1) 5/8 inch Open End Wrench
After the system has been vented, remove the inlet heater from the ionizer mounting
flange and any attached sample lines. To remove the QuickInlet loosen the large central
fitting on the ionizer flange. The hex closest to the flange (5/8 inch) is welded to the
flange. The outer hex nut (3/4 inch) can be rotated counterclockwise to loosen the fitting
and remove the inlet. Be careful when loosing this fitting that your wrench does not
contact the 10 pin vacuum feedthrough and damage it.
Withdraw the inlet from the flange and remove the ¾ inch hex nut from the inlet. Also
remove the old metal gasket as these can not be reused.
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