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Petrel

Sensors in Chaos!

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Q. If you saw this (three sensors out of agreement) what would you do?HandsetIMG_3462l

A. When three sensors are out of agreement on the Shearwater Petrel controller, the solenoid will not fire. You will see a message “Voting Logic Failed.” You should bail to open circuit. A diluent flush may confirm which (if any) of the sensors is working properly in the event that you have a long transit out of an overhead environment and are concerned about the volume of open circuit gas available to you. In that case you could theoretically run the unit manually on one working sensor. However, if two of the rogue sensors get close to each other you should be aware that the voting logic may reactivate the solenoid based on two similar bad sensors. Lowering the set point is a good idea, but the best solution is to use open circuit bailout or SCR as a gas extender. Your sensors can’t be trusted.

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Shearwater Petrel Calibration Tip

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Calibration Errors on a Shearwater Petrel

Q. I’m trying to calibrate my unit. The HUD shows 1.0 with green and yellow rows of lights. I have fully flushed with oxygen. The handset reads .97, .98 and 1.00 already. The millivolts on the first screen look right and are in range. What is it failing calibration? Looking at the failure screen the millivolts are off the charts, each reading over 200? What’s going on?

A. Check your System Settings. Ensure the Calibration O2 is the correct value. After a battery failure, numerous parameters in your computer such as “units” reset. Your cal gas might be registered at 0, rather than .98. Check that value. Once you reset it, the calibration will likely pass.

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New Video for Hollis PRISM2 Rebreather Shearwater HUD

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Jill Heinerth has created a free new video resource for users of the Hollis PRISM2 Rebreather Shearwater Heads Up Display (HUD). View here on YouTube.

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