Kirby 77 Kirby Morgan Opening the Breathing Gas Supply to the Helmet, Fogging Prevention

Kirby Morgan 77

3.8.3 Opening the Breathing Gas Supply to the Helmet

Prior to turning on the air supply for the helmet, check to see that the free flow valve is closed and the regulator adjustment knob is all the way in.

Slowly bring up the gas pressure to the helmet to 150 p.s.i.g. (10.2 bar). Slowly back out on the regulator adjustment knob until a slight free flow develops, then turn the adjustment knob in (clockwise) until the free flow just stops.

To properly check the breathing system you must completely don the helmet.

3.8.4 Fogging Prevention

A thin film of anti-fogging solution may be applied to the interior of the polycarbonate face port prior to the dive to help prevent fogging during the dive. A mild liquid dish washing detergent, or other commercially available anti-fogging solutions, may be applied with a soft rag or paper towel to the interior of the port.

The diver should use a solution which has been found satisfactory in the past. However, do not use an aerosol spray on the polycarbonate lens. The propellants in some aerosol dispensers cause damage to the lens.

WARNING

Never use any aero- sol propelled sprays near the face port of the any Kirby Morgan helmet or band mask.

The propellant used in these aerosols can invisibly damage the polycarbonate face

port and cause it to shatter upon impact from any strong blow. If the face port fails underwater the helmet will flood and drowning may result.

A thin film of dish soap or other anti-fogging solu- tion should be applied to the lens prior to the diver donning the helmet.

© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document #080626002 53