Shearwater Perdix User Manual
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Shearwater Perdix User Manual

Nitrox recreational mode
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Nitrox Recreational Mode - Perdix
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Questions and answers

corey J Ladson
April 23, 2025

is there a comprehensive video available for operation

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1 comments:
Mr. Anderson
May 12, 2025

Yes, there is a comprehensive video available that guides users through the Shearwater Perdix firmware upgrade and setup process.

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Summary of Contents for Shearwater Perdix

  • Page 1 Nitrox Recreational Mode - Perdix User Manual...

  • Page 2: Table Of Contents

    2. Modes Covered by this Manual ......... 5 8�4� Nitrox Gases ���������������������������������������������������������������������������������������������������� 20 8�5� Display Setup �������������������������������������������������������������������������������������������������� 20 3. Buttons ................. 6 Units ��������������������������������������������������������������������������������������������������������� 20 3�1� Turning the Perdix On ������������������������������������������������������������������������������������6 Brightness ������������������������������������������������������������������������������������������������ 20 3�2� Button Labels �����������������������������������������������������������������������������������������������������6 Altitude ����������������������������������������������������������������������������������������������������� 21 Flip Screen ����������������������������������������������������������������������������������������������� 21 4.

  • Page 3: Conventions Used In This Manual

    Shearwater Perdix Nitrox Recreational Mode Conventions Used in this Manual DANGER These conventions are used to highlight important information: This computer is capable of calculating deco stop requirements. INFORMATION These calculations are at best a guess of the real physiological Information boxes contain useful tips for getting the decompression requirements.

  • Page 4: Introduction

    Shearwater Perdix Nitrox Recreational Mode 1. Introduction The Shearwater Perdix is an advanced dive computer for all types of diving. This manual covers operation of the Nitrox Recreational Mode. Please take the time to read this manual. Your safety may depend on your ability to read and understand the Perdix displays.

  • Page 5: Modes Covered By This Manual

    Other Tec modes (not covered by this manual) are: This manual only covers operation of the Shearwater Perdix in the Nitrox Recreational Mode (OC Rec). The Shearwater Perdix also has modes for techincal diving The OC Tec mode allows up to 5 with trimix and rebreather diving�...

  • Page 6: Buttons

    Perdix Buttons FIGURE 6 Turning On Two piezo-electric buttons operate the Perdix. Most operations are simple, single button presses, except for turning on which requires Press both buttons at the same time to turn on. pressing both buttons at the same time.

  • Page 7: The Main Screen

    Shearwater Perdix Nitrox Recreational Mode 4. The Main Screen The Main Screen shows the most important (FIGURE 8) information for Air and Nitrox diving. It is divided into three sections: Basic dive info, decompression info, and the configurable bottom row.

  • Page 8: 4�4� Detailed Descriptions

    Shearwater Perdix Nitrox Recreational Mode 4.4. Detailed Descriptions Decompression Info Area The following describes each main screen display in detail. Basic Dive Info Area Safety Stop Depth Counts down automatically when in the safety stop range. The depth is shown in the top left.
  • Page 9 Shearwater Perdix Nitrox Recreational Mode Decompression Info Area Configurable Bottom Row (continued) Nitrogen Loading Bar Graph The gas position is not configurable. It The nitrogen bar graph is scaled such shows the currently selected breathing gas. that it is full once decompression stops will be needed.

  • Page 10: Info Screens

    Shearwater Perdix Nitrox Recreational Mode 5. Info Screens Return to Main Screen by: Info screens provide more information than is (FIGURE 19) • Pressing (left) button MENU available on the main screen. • Waiting 10 seconds • Stepping past last screen The info screens only replace the bottom row, keeping the other information visible at all times.
  • Page 11 Shearwater Perdix Nitrox Recreational Mode TEMP GF99 The current temperature. In °F when units are feet or °C The gradient factor as a percentage (i.e. super-saturation when units are meters. percent gradient). Note that the case insulates the temperature sensor, so...
  • Page 12 After descent For this reason it is important that the battery type setting is correct. Otherwise the Perdix may not warn The vertical black line shows the inert properly and the battery may die unexpectedly. gas inspired pressure. The boundary between the green and yellow zones is the ambient pressure.

  • Page 13: 5�2� Compass

    Shearwater Perdix Nitrox Recreational Mode 5.2. Compass Marking a Heading The Perdix contains a tilt-compensated digital compass. To mark a heading, when viewing the compass press the MENU (left) Compass Features button. This brings up the “Exit/Mark” menu. Press the SELECT (right) •...

  • Page 14: Safety And Decompression Stops

    See System SetupDeco Setup for options. No lock-out for omitting safety stop The Perdix does not do “deep safety stops”. That is, there are There is no lock-out or other penalty for omitting a no extra stops added around 50ft to 60ft (15m to 18m) when safety stop, as they are optional.

  • Page 15: 6�2� Decompression Stops

    Shearwater Perdix Nitrox Recreational Mode 6.2. Decompression Stops At Deco Stop While at the stop depth or up to 5ft Decompression stops are mandatory stops that must be (1.5m) deeper, the title will turn green followed in order to reduce the risk of decompression illness and a check mark will be shown.

  • Page 16: Menu Reference

    The menu system adapts to the current state of the NDL Planner+ Brightness dive computer. Adaptive menus prevent mistakes and keep the Perdix easy to use. For example, during a dive the Turn Off, Dive Log, and Dive Log+ Surface...

  • Page 17: 7�1� Turn Off

    The Perdix will automatically exit dive mode once 1 minute stops. (default End Dive Delay setting) has been spent at the surface. Use this menu command to exit dive mode sooner.

  • Page 18: 7�4� Dive Log

    Fresh water setting. Clear all logs so they will not appear in the Perdix dive log and will not upload to a computer. The EN13319 value is between Fresh and Salt. It is from the European CE standard for dive computers, and is the Perdix’s default value.

  • Page 19: 8�2� Deco Setup

    Shearwater Perdix Nitrox Recreational Mode 8.2. Deco Setup 8.3. Bottom Row The only deco model available Configure and preview the bottom in Nitrox Recreational mode row in this menu. is Bühlmann ZHL-16C with Gradient Factors. The left position always displays the current gas.

  • Page 20: 8�4� Nitrox Gases

    Shearwater Perdix Nitrox Recreational Mode 8.4. Nitrox Gases 8.5. Display Setup This page is used to define up to 3 nitrox gases. Units Two options are available: Note that gases may also be edited (even during a dive) in the Feet: Imperial units (depth in Dive Setup menu.

  • Page 21: Altitude

    This function displays the contents of the screen upside down. The Flip Screen is of limited use on the Perdix model, but can be used if you wish to weat the Perdix such that the buttons are on the top of the device.

  • Page 22: Calibrate

    (e.g. iron or nickel) object is mounted very close to Date & Time the Perdix. To be calibrated out, such an object must be The current date. Can be mounted with the Perdix such that it moves along with the viewed in the info screens and Perdix.

  • Page 23: 8�8� Adv� Config

    Be sure not to cross thread the battery cap’s threads. Tighten Max. Depth the battery cap until snug and the Perdix powers on. Do not Used together with the MOD PPO2 setting to determine over tighten the battery cap.

  • Page 24: 9�1� Battery Types

    NiMH type to be entered. rechargeables. Good in cold water. The Perdix attempts to guess what type of battery is being used. If the battery type is incorrect, it should be manually NOTE: Battery operating lifetimes are given with screen edited.

  • Page 25: 9�2� Behaviour On Battery Change

    Clock is replaced, allowing for battery changes between repetitive dives. However, the Perdix does not know for how long the The clock (time and date) is saved to permanent memory battery was removed, so no surface interval adjustment is every 16 seconds when the Perdix is on, and every 5 applied for the time that the battery is removed.

  • Page 26: Error Displays

    Shearwater Perdix Nitrox Recreational Mode If at time of battery replacement any tissue is below 10. Error Displays saturated with air at the current pressure, then that tissue is brought up to being saturated with air. This might happen The system has several displays that alert to error conditions.

  • Page 27: Troubleshooting

    Setting Description Watch- The computer has reset to Please report to Shearwater Time of day is not The Perdix uses a highly accurate quartz recover from an unexpected Research Inc. accurate crystal for time keeping. Expected drift is about Reset software condition.

  • Page 28: Storage And Maintenance

    MOD - Maximum Operating Depth. The deepest depth to which a Store the Perdix dive computer out of direct sunlight in a cool, gas may be safely used. dry and dust free environment. Avoid exposure to direct ultra- NDL - No Decompression Limit.

  • Page 29: Specifications

    Shearwater Perdix Nitrox Recreational Mode Specifications FCC Warning Specification Perdix Model a) USA-Federal Communications Commission (FCC) This equipment has been tested and found to comply with the limits for a Class B digital Operating Modes OC Tec device, pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable OC Rec protection against harmful interference in a residential installation.

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