2�9�9 Face Port Or Viewing Lens; Accessories; 2�10�1 Eye Protection For Welding - Kirby Morgan 77 Operation And Maintenance Manual

2.9.9 Face Port or Viewing Lens
Oral/nasal mask
Port
retainer
Nose block
device
The face port or viewing lens is extremely strong clear
polycarbonate plastic which is easily removable for
replacement of the lens. An O-ring, located under the
lens, seals the lens to the stainless steel helmet shell.
DANGER
The port retainer screws must be tightened
to proper torque specifications per the in-
structions in this manual. See Appendix 1
for proper torque specifications. Do not over
tighten. This could lead to port failure and
helmet flooding. Drowning could result.

2.10 Accessories

2.10.1 Eye Protection for Welding
The Welding Lens assembly (Part #525-403) or the
new Weld Shield Assembly (Part #525-400) may
be installed on the port retainer using the pre-drilled
and tapped holes that are provided. These holes are
plugged with blanking screws when a new helmet is
shipped from our plant.
The weld lenses are standard 2 x 4 1/2 inches or 4 1/2
x 5 1/2, identical to the lenses used in topside welding
hoods. They may be replaced quickly without tools.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Nose block
knob
o-rings
Packing
nut
The KMDSI Welding Lens for Kirby Morgan helmets
(KMDSI Part #525-403)
CAUTION
Be sure to use only the mount screws pro-
vided with the weld lens assembly. Lon-
ger screws can damage the port retainer
mounting inserts and cause the face port
O-ring to leak.
Kirby Morgan 77
®
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