INFICON PLO-10i Phase Lock Oscillator - Manual (Page 45)

PLO-10 PHASE LOCK OSCILLATOR
CRYSTALS, HOLDERS AND FLOW CELL 7-11
Figure 15 Crystal Installation
3. Place the Retainer Ring over the Crystal, with the Notch mating to the Index Pin.
4. Mount and turn the Retainer Cover approximately ¼ turn. Then with a gloved-finger
or cotton swab gently press the Retainer Ring down at the Notch to make sure that it stays
mated to the Index Pin. Finish tightening the Cover until it’s snug.