7
Control housing
Shortened stem length
Extra, coiled
cable
3.
You should now be able to move into your “search”
position by leaning slightly forward and raising the
search coil no more than 2 inches above the ground.
Your arm should still be straight, and the coil should
be parallel to the ground, about 12 inches in front
of your foot. The coil angle may have to be slightly
readjusted at this point.
SETTING UP FOR DIVING
Unlike most VLF metal detectors, the CZ-21 works well in salt
water. This capability, along with its deep-seeking sensitivity, makes
it ideal for underwater treasure hunting and wreck diving. The CZ-21
is waterproof to a depth of 250 feet. Remember, always practice
safe diving methods.
When diving with your CZ-21, use the shortest stem length
possible, with the extra cable wrapped tightly around the stem,
as closely as possible to the control housing. Never hipmount your
control housing while diving.
1.
Adjust the stem length as short as you can without having
the search coil detect your diving gear.
2.
Adjust the search coil parallel to the sea bed, river or
lake bottom.
3.
Make sure extra cable is coiled tightly on the upper stem
as closely as possible to the control housing, with just
enough slack near the search coil to allow it to swivel
as far as it can in either direction. Too much loose cable
near the search coil may generate false signals.
4.
Remove the tethered earphone plugs for rapid pressure
equalization as you dive and return to the surface.
SETTING UP
Figure 5.
34
BATTERY REPLACEMENT
VERY IMPORTANT
Follow these instructions carefully to avoid getting water in the
battery compartment.
1.
Tuck in the wires. Do not pinch them in the seal when closing.
2.
The battery door will capture the battery holder and self-center
it as you install the door.
3.
Tighten the knobs SECURELY.
a.
Use a coin.
b.
Tighten by hand FIRMLY.
Use maximum MANUAL force.
c.
Do Not use a tool.
d.
Do Not use a screwdriver.
Torque Specification is 8 in-pounds.
4.
If you have removed the gasket, see page
36 for installation instructions.
An improperly installed gasket = a water leak!
5.
Submerge the detector in water for 1/2 hour.
a.
Remove from water.
b.
Dry off the detector
c.
Remove the battery door
d.
Verify that no water has entered.
This step is necessary to insure that you are applying
enough force to the screws.
6.
If you cannot tighten the screws securely by
hand, then use a screwdriver.
a.
Tighten the screw a maximum
additional rotation of 15° beyond the
hand-tightened position.
7.
Lithium grease is installed between the
contact surfaces of the thumb-screw and
insert in the case.
a
. Do not wipe off the grease.
b
. With usage, the grease may wear off.
c.
Without grease, the thumb-screw may seize up after
tightening. If this happens, reapply a small amount of
lithium grease between the contact surfaces.
15°
