How accurate are the pressure sensors used in the RF Gas Modules?

The pressure sensors are accurate to +/-0.04 psi. Fluctuations in cumulative pressure beyond this correspond to either a leak or a fluctuation in temperature when a module is attached to a sealed bottle. If you check the "valve open" check box, leave it checked until you hear the valve open. The pressure should drop to 0.00, but it may fluctuate +/-0.04 psi. The cumulative pressure fields in the GPM program screen represent a calculation of the starting absolute pressure in the bottle subtracted from the Zero module's atmospheric pressure reading. Both should initially be the same so the cumulative pressure should start at 0.00.