KMB 18 & 28 MANUAL
page 22
© Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 010518001
2.2.8 Check Communications
Check the communications system for proper
operation. Put the Band Mask on and talk to an
assistant on the amplifier. If you are by yourself,
take the Band Mask near the amplifier and tap on
each earphone and the microphone, listening to
the taps on the amplifier/speaker. Talk into the
amplifier/speaker feeling the vibration on each
earphone and the microphone with your finger-
tips.
DANGER: If a good seal is not
present, the breathing system will not
work properly. In addition, the mask may
flood with water, causing drowning and/
or death. It is the diver’s responsibility to
make sure a good seal is present.
2.2.7 Sealing Integrity Check
If there is any doubt whether or not the Band
Mask is sealing properly, perform the following
test prior to diving.
Turn the supply gas off at the dive control system
and bleed the umbilical. Pull the nose block
device knob (34) all the way out, away from the
mask. Have the diver install the mask on his/her
face, but do not fasten the hood. Do not fasten
the head harness (spider). With the mask held
firmly against his/her face, there must be a suc-
tion on the diver’s face when he/she inhales. This
will indicate that the mask is forming a good seal.
If there is any leakage the diver must not dive
until the source of the leakage has been found and
corrected.
Fig. 2.7 Always test the breathing system prior to diving.
Fig. 2.8 Always check the communications with the
mask prior to each dive.
2.3 Diving Procedures
2.3.1 Fogging Prevention
A thin film of anti-fogging solution must be
applied to the interior of the face port (27) to
prevent fogging during the dive. A liquid dish
washing detergent such as “JOY” must be ap-
plied with a soft rag or paper towel to the interior
of the port. Other anti-fogging solutions are com-
mercially available. The diver should use what-
ever solution he has found satisfactory in the past.
However, do not use an aerosol spray on the lens.
The propellants in some aerosol dispensers cause
damage to the port.
