Operating instructions

CARE & MAINTENANCE
The Matrix is a robust instrument designed to withstand the rigors of SCUBA diving. However, you still need to protect it
from shock, extreme heat, chemical attack, and tampering.
Even though the Matrix’s material is tough and durable, it is susceptible to chemical attack and scratches. Chemical
attack can be in the form of spray propellants, gasoline fumes in your garage or boat, and alcohol. U.S. Divers can
replace scratched gauge faces. However, small scratches naturally disappear underwater.
CAUTION: Never use aerosol sprays, including silicone sprays, on or near the Matrix. The
propellants may chemically attack the plastic, causing the plastic case to crack.
Before the Dive
The Matrix’s plastic housing is made of a shock resistant resin. This housing, combined with the rubber console boot,
protects the Matrix from the normal bumps that occur when diving. However, the computer cannot withstand the impact
of heavy objects, such as weight belts or SCUBA cylinders. Impact from heavy objects is the most common cause of
computer damage. When you set up your dive gear on a boat or the beach, tuck the Matrix into your BC pocket, or
between the BC and cummerbund. Never leave the computer exposed where someone could accidentally step on it or
drop something on it.
During the Dive
The most common damage inflicted on a computer while underwater is scratches to the computer face. Scratches
occur when a dangling computer gets dragged over coral or rocks. Most BCs have gauge hose retainers that keep the
computer close to your body for easy access and reduce the possibility of scratching the computer face.
Note: Dangling gauges are a major cause of damage to delicate marine life, such as corals. Always keep secondary
hoses, such as your octopus and gauge, retained close to your body.
After the Dive
CAUTION: If the Matrix is not attached to a first-stage regulator while soaking (explained
below), make sure that water is not allowed to enter the high pressure hose. Water entering
the submersible pressure gauge (SPG) via the high pressure hose may cause damage to the
internal components.
After each day of diving, soak the Matrix in a warm, fresh water bath to dissolve salt crystals. To dissolve heavy salt
buildup, use a slightly acidic vinegar/water bath. After removing the computer from the bath, rinse thoroughly with fresh
water. Towel dry the computer before final storage. Place the Matrix in a cool, dry and protective case to transport.
CAUTION: Never, under any circumstances, poke any object through any slots or holes on the
rear of the Matrix. Doing so may damage the depth sensor resulting in erroneous depth and/
or dive time remaining displays.
ANNUAL DEALER INSPECTIONS & FACTORY SERVICE
The Matrix should be inspected annually by an Authorized U.S. Divers Dealer. The dealer will perform a depth accuracy
test, function check, and routine inspection for damage or wear. To keep the two-year limited warranty in effect, this
annual inspection must be done one year from the purchase date, plus or minus 30 days. U.S. Divers recommends that
you continue to have yearly inspections to ensure the Matrix is working properly, even after the warranty period expires.
An annual inspection record is provided in the rear of this manual, which should be signed by the technician after each
inspection. The cost of this service is not covered under the two-year limited warranty. Also, be sure to record any
factory services that are performed.
If you ever doubt the accuracy of the Matrix’s depth readings, DO NOT dive with it until you have it inspected by a U.S.
Divers dealer. Some dive stores who provide this service do not have test gauges on their pressure chambers as
accurate as the depth sensor on the Matrix. Therefore, if you request a depth check, verify that the test chamber gauge
accuracy is better than ±2 feet.
It is possible to damage the Matrix’s depth sensor if it is not pressure tested properly. Please heed the following caution:
CAUTION: Always fully submerge the Matrix in water when performing a pressure test. Pres-
sure testing the Matrix in an air environment may damage the depth sensor, resulting in
erroneous depth and time readings.