Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions User Manual

Page 20

Veris Technologies

Pub. #OM MSP03-1

5) If the readings vary significantly (more than one whole number) contact our service

department.

6) Once the test is complete, remove the test load and reinstall the implement signal cable.

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 set screw 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.

Here is a cut away view of the hubcap assembly:

Test Load