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1.5.5 Communications
The Kirby Morgan Band Mask (KMB 18A/B and
28) communications system is very simple. For
two wire (push to talk) communications systems,
the left earphone (11) with the longer wire, and
the right earphone (10) with the shorter wire, are
wired in parallel with the microphone (12) to the
communications posts (73). These posts (73) are
also known as "bare wire" connectors. The wire
that is part of the umbilical bundle is connected to
these connectors.
The KMB 18A/B & 28 may also be fitted with a
waterproof connector (80). This system comes
standard with a terminal block (82) that is used
with four wire communications, also known as
"round-robin" systems. The terminal block can
also be wired for two wire systems if preferred.
Electrical signals are sent to, and received from,
the surface through the umbilical wires. An am-
plifier boosts the signals to the desired volume for
the surface and the diver. The diver is always
"on" in a two wire system, except when the
tender pushes a switch to talk to the diver. In a
four wire system, both top side and the diver can
speak at the same time, just as you would on a
telephone.
1.5.6 Hood and Face Seal
The hood and face seal (2) is fabricated from
foam neoprene and open cell foam. The open cell
foam forms a comfortable cushion that pushes the
sealing surface of the foam neoprene against the
diver's face.
The hood incorporates built-in pockets that are
open to the interior of the mask frame (17). These
pockets retain the earphones (10,11). It is very
easy to remove the earphones for maintenance.
If the standard hood does not fit your head com-
fortably, other sizes are available from your
KMDSI dealer.
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
KMB 18 & 28 MANUAL
1.5.7 Hood and Face Seal Retainer Bands
(15, 16, 68)
The top band (16) and the bottom band (68) fit
around the hood and face seal combination (2)
and clamp it firmly to the mask frame (17). Two
screws (15) hold these bands in place. Five spider
"hooks" consisting of stainless steel posts welded
to the retainer bands (16,68) are located on the top
and bottom bands. The top band (16) has three
stainless steel posts. The bottom band (68) has
two stainless steel posts.
DANGER: The bands must be tight-
ened properly or the mask frame may
separate from the hood and face seal. If
this happens the diver can drown and
death may result.
1.5.8 Head Harness or "Spider"
The five legged head harness or "spider" (1) is a
simple and convenient method of keeping the
mask in place against the diver's face. The mul-
tiple holes punched in each leg allow adjustment
to fit any size head. It will be more comfortable if
the lower rear or neck area is as low as possible on
the diver's neck. If this lower portion of the spider
(1) is too high, it will cause the face seal to push
up on the chin causing discomfort.
1.6 IMPORTANCE OF PROPER
MAINTENANCE
Although the Kirby Morgan Band Mask KMB
18A/B is a rugged piece of equipment, proper
care and maintenance is essential. The demand
breathing system is simple in design but subject
to malfunction if not properly maintained. Nor-
mal wear requires periodic internal adjustment to
the regulator. This will assure the diver of easy
breathing.
1.6.1 Special Tools
A Regulator Adjustment Tool Kit (KMDSI Part
#525-620) containing four special adjustment
tools is available for internal adjustment of the
demand regulator assembly (63a/b). These tools
make regulator adjustment much easier. The tool
kit comes in a convenient, wallet sized pouch
with instructions.
page 15
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