Veris Technologies VIS_NIR Spectrophotometer - Operating Instructions - Manual (Page 42)

Pub# OM17-NIR Shank
4-3
Note: It is advisable to conduct this test as a routine check to ensure that you are
obtaining reliable EC data.
ADJUSTMENTS
Commutators-The spring-loaded commutators are located in the center of each coulter
electrode hub cap. They are factory preset, and should not need routine adjustment. If
a continuity test shows abnormally high resistance, the commutators should be
checked. This may be performed in the following manner:
1) Remove the 3/8” allen head set screw.
2) Remove the commutator by turning counter-clockwise.
3) Depress the spring loaded tip on a hard surface to determine if
plunger has adequate tension and can move freely.
4) If the plunger will not move freely, replace, and coat with di-
electric silicone grease.
5) If the commutator appears to be in good working order, reinstall
in the hub, and adjust until it bottoms against the spindle end.
Rotate 1/2 turn backward to allow adequate clearance. Improper
adjustment will result in premature failure (too little tolerance) or
poor continuity (too much tolerance).
6) Reinstall locking set screw and tighten firmly on top of
commutator. The top of the setscrew should be even with the
face of the hub. If not, remove and adjust the commutator
inward or outward as necessary.
7) Re-test coulter electrode continuity.
27 3
LOG
Figure 5