ThePetrel 3 Fischer includes a Fischer 103 I/O port used for external PO2 monitoring of up to three oxygen sensors in a rebreather loop. Once the Petrel 3 Fischer is plugged in to a sensor cable via the Fischer 103A connector and calibrated it uses the PPO2 input from the sensors to determine the system average PPO2 used for decompression calculations and CNS tracking. A voting algorithm is used to decide which of the three sensors are likely to be correct. If a sensor matches either of the other two sensors within ±20%, it passes voting. The system average PPO2 is the average of all sensors that have passed voting.

The Petrel 3 from Shearwater Research of Canada is a full decompression dive computer incorporating the Bühlmann ZHL-16C algorithm, with user configurable Gradient Factors (GF). Gradient Factors allow the diver unique and individual control of their dive computer decompression calculations. An optional PIN upgrade to the Varying Permeability Model (VPM-B and VPM-B/GFS) decompression algorithm is also available (the DCIEM algorithm is not applicable to rebreather modes.) The Petrel 3 includes a richly featured 'gauge mode' configuration, along with a three-axis tilt-compensated digital compass. The included CCR mode for rebreathers provides the ability to perform constant PO2 set point calculations for deco.

During a decompression dive, the Petrel 3 provides complete information displays of all required stop times. The Petrel 3 can provide time-to-surface based on "look ahead" at planned gas switches. Multiple gas definition presets are supported with any combination of oxygen, nitrogen and helium. The Petrel 3 will NOT "lockout" after a missed stop or ascent rate violation. Out of the box, all models include open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality. The Petrel 3 offers a screen display utilizing a low-power consumption, high resolution QVGA, full color LCD display. The display will automatically adjust intensity based on available light to make the display easily readable whether on the surface in sunlight, in open water or in a cave.

The Perdix 3 is capable of wirelessly connecting to optional SWIFT transmitters giving the diver ability to monitor up to four tank pressures. It is also capable of calculating the Gas Time Remaining (GTR). Air integration is optional for all modes, from OC Rec to CC/BO. The tank pressure(s), in PSI or BAR, and GTR can be displayed to the customizable slots on the main display screen or accessed through the underlying information screens. Enabling the AI feature causes approximately 10% decrease in Perdix battery life. The Perdix AI base price does not include a tank pressure transmitter because the consumer may already own a compatible transmitter. You may include transmitters during purchase or add them at a later time.

The Petrel 3 has been designed to accept any type of AA size battery including alkaline, lithium and rechargeable. Included with every Petrel 3 from Dive Gear Express are two elastic straps with buckles, gold contact battery holder and battery already installed (ready to dive out of the box!). The Petrel 2 also includes a screen protector already installed to help prevent scratches of the display face. The software includes a complete dive log manager, compatible with both MS Windows and MAC OS X, and can be downloaded from Shearwater's website along with the manual. The dive log manager supports log downloads and firmware updates via the Bluetooth wireless interface of the Petrel.

Technical Open-Circuit Features

• Air/Nitrox/Trimix capable
• 5 open-circuit gas switch presets
• Bühlmann ZHL-16C algorithm with configurable Gradient Factors
• GF presets for sport diving NDL safety factor: High = 35/75, Medium = 40/85, Low = 45/95, plus user defined GF
• Optional Varying Permeability Model (VPM-B)
• %CNS oxygen exposure tracking
• Ascent rate monitor
• User configurable haptic (vibration) alerts
• Date, time and temp display
• Easy to read large full color screen
• Easy to use adaptive menus
• Water activated and programmable
• Logbook of last 1000 hours of diving
• Operational to at least { 980 fsw | 300 msw}
• Battery voltage and warning
• Metric and Imperial
• Right or left wrist mountable
• Battery life (Saft 3.6V LS14500) up to 90 hours of diving
• Battery life (1.5V Alkaline) up to 36 hours of diving

Rebreather Features

• Constant PPO2 Set Point
• Automatic Set Point Switching
• 5 additional CCR Diluent gas presets
• 2 button push OC bailout
• EXT model supports External PO2 monitoring
• Also Supports Semi-Closed

Also...

• Three-axis tilt-compensated digital compass
• Titanium bezel
• Wireless Tank Pressure (option transmitter required)
• Bluetooth Smart wireless upload/download
• User upgradeable firmware
• User changeable battery
• Dive Log Software
• Two Year Limited Warranty

Included with every Petrel 3 Fischer from Dive Gear Express are two elastic straps with buckles, gold contact battery holder and battery already installed (ready to dive out of the box!), USB Bluetooth adapter, mini-CD with Petrel Manual (PDF) and printed Quick Start Guide with instructions for downloading software from the Shearwater Research website, the Fischer 103 connector, cap, and small bottle of mineral oil. The Petrel 3 also includes a titanium bezel and a screen protector already installed to help prevent scratches of the display face. The software includes a complete dive log manager, compatible with both MS Windows and MAC OS X. The dive log manager supports log downloads and firmware updates via the Bluetooth wireless interface of the Petrel. However, the Petrel 3 does NOT include a cable and sensors, that is a custom solution which must be supplied separately for your specific brand and model rebreather.