[RASMB] Lamp o-ring Beckman part number

[John Gunther]

    The lamp o-ring for the XLA is Beckman part number 961564, o-ring, Strobe Lamp Face - to - Lamp assy. The material is listed as Kalrez, and is NOT vacuum greased. 
The other little o-ring on the outside is 961565, o-ring, Lamp Assy - to - Monochromator Mount, and is also Kalrez, and not greased.
    All the other o-rings in the XLA are Buna-N, and are greased with silicone vacuum grease (except the PMT Seal).
    Dirty, worn, or dry (no vacuum grease) o-rings can cause wavelength repeatability problems, and radial position problems, as the shafts to the inside of the chamber are sealed by these o-rings. 

John Gunther
Lab Performance Specialists
Rocky Mountain Operations

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