8. Testing for Cracking Effort
(1) Cracking effort is the suction required to depress the lever and allow air to flow through the second
stage. It is measured in inches of water. A magnehelic gauge is one method of measuring this pressure.
The gauge is attached to the second stage, and a normal breath is taken. The gauge measures the
cracking pressure.
(2) Another method is to carefully submerge the second stage into a container of water and note where
the air begins to flow using a ruler attached or held to the stage. This method is not always as accurate
as using a magnehelic, but still yields acceptable results.
Caution Note: Do not leave the In-Line Adjusting Tool attached when submerging
the second stage. Connect the stage to the LP hose directly. The tool is meant
for surface use only and submerging it may result in damage to the tool!
(3) Cracking effort should initially be set at 1 to 1.2 inches of water. This will account for the decrease
that will occur as the regulator is used. As the Seat begins to form the groove between it and the Orifice
knife edge, cracking effort will decrease.
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