Figure 3-3. Shutter Maintenance
Two 6-32 fasteners simplify plate removal.
It will require occasional cleaning due to dirt buildup
within the shutter chamber.
Set the tester on its side or tail with the source in safe
position. Stand behind the tester, peek over bottom of
tester to see cleanout plate. Remove the 1/4 turn
fasteners holding the cleanout plate in position.
Remove the plate and the captive shutter. The shutter
and cleanout plate are an integral assembly. Do not
touch the brass ring around the hole in the plate. Clean
the shutter and the plate thoroughly, and clean out the
shutter chamber with a brush (standing behind the tester
while this is done). It is not necessary to extend the
source to clean the end of the rod! Leave it alone!
Spray the shutter, cleanout plate, and the interior of the
(Appendix E, Item 2). This lubricant should then be
allowed to dry for a period of four hours or more to cure
to the metal. This will provide a long life lubrication of the
maximum utility between cleanings.
Do not force the source rod handle when
the shutter is dirty.
CPN does not recommend the use of oil or grease for
lubrication, however, several customers have reported
good performance by spraying WD-40 (Appendix E, Item
3) into the shutter chamber without disassembling it. The
use of WD-40 will not injure the tester or affect test
results. If it works for you, use it.
SHIPPING CASE MAINTENANCE
The shipping case is a fiberglass case built to MIL Spec
standards. It is very strong and will produce excellent
No special care is required on the case other than an
occasional cleaning (both inside and out) with soap and
TESTER EXTERIOR MAINTENANCE
Wash the tester with soap and water if it becomes
Drycleaning solent PD-680 is toxic and flammable.
Wear protective goggles and gloves and use only in a
well ventilated area. Avoid contact with skin, eyes, and
clothes, and dont breathe vapors Do not use near open
flame or excessive heat. The flash point for Type #1
Drycleaning Solvent is 1000F (380C) and for Type #2 is
1380F (500C) If you become dizzy while using cleaning
solvent, get fresh air immediately and get medical aid If
contact with eyes is made, flush your eyes with water
and get medical aid immediately.
Remove asphalt with PD-680.
Do not scratch display window with abrasive cleaners.