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Page 30

Doc. 13301-Tec-RevB (2022-05-25)

Technical Modes 
Operating Instructions

6. Example Dives

6.1.  Simple OC Tec Example Dive

This is an example of displays that might be seen on a 
simple decompression dive in OC Tec Mode�

1. Set Up Gases

 - Best practices include checking your 

gas lists before each dive� This screen is available in 
the System Setup menu� This dive only involves air� 
Turn off all gases you do not plan to use on the dive�

2. Verify Settings

 - It is also prudent to ensure all 

other settings are correct before starting the dive� Not 
all settings can be modified underwater� 

3. Plan Dive 

- Use a deco planner to check the total 

runtime, decompression schedule and gas quantity 
needed�

The on-board deco planner is limited in functionality� 
For complex dives we recommend planning using 
desktop or smartphone dive planning software�

4. Pre-Dive

 - This is the surface screen immediately 

before descending� It shows the computer is in OC 
mode and that 21% O2 is selected�

5. Descent 

- As we pass through 10 meters, the time-

to-surface (TTS) shows one minute� This shows that 
the computer is expecting the diver to ascend at 
approximately 10 meters per minute or 33 feet per 
minute� Decompression predictions are based on this 
ascent rate�

6. NDL Decreasing

 - The no-decompression limit 

(NDL) starts off showing 99, but then starts to show 
a smaller number as the depth increases� This screen 
shows that we will go into deco in 12 minutes�

(Continued on next page)

1� Set Up Gases

2� Verify Settings

3� Plan Dive

4� Pre-Dive

5� Descent

6� NDL Decreasing

TIME

TTS

OC 21/00  99    1

O2/HE

NDL

PPO2

DEPTH

TIME STOP

10.0

.42

1

TIME

TTS

OC 21/00  12   3

O2/HE

NDL

PPO2

DEPTH

TIME STOP

28.0

.80

4

SURFACE

TTS

OC 21/00   0   0

O2/HE

NDL

 .21

PPO2

  .0       

DEPTH

TIME

  10

h

58

m

 

A

Quit

Next

  

  030  030  14  

 

 30 bot  30 21/00 1640   

Depth Time RMV 

Stp Tme Run  Gas

 12 asc  32 21/00   78  

 12   1  33 21/00   31  

  9   4  37 21/00  106  

  6   7  44 21/00  156

Qnt

OC

Deco Model 

GF

Conserv (GF)  30/70

Last Stop 

6m

NDL Display 

NDL

Clear Cntr     On

Next

Edit

Deco Setup

A1 OC     On  21/00

 

2 OC     Off 00/00

 3 OC     Off 00/00

 4 OC     Off 00/00

 5 OC     Off 00/00

Next

Edit

OC Gases

Summary of Contents for Perdix 2

Page 1: ...Technical Modes Operating Instructions...

Page 2: ...Example Dive 29 6 2 Complex OC Tec Example Dive 31 6 3 CC Example Dive 33 7 Gauge Mode 36 8 Compass 37 9 Air Integration AI 38 9 1 What is AI 38 9 2 Basic AI Setup 39 9 3 AI Displays 42 9 4 Sidemount...

Page 3: ...ake riskier dives obtain the proper training and work up to them slowly to gain experience This computer will fail It is not whether it will fail but when it will fail Do not depend on it Always have...

Page 4: ...Optional VPM B and DCIEM decompression models No lockout for violating deco stops CNS Tracking Gas Density Tracking Quick NDL and full decompression planner built in Simultaneous wireless pressure mo...

Page 5: ...bed are applicable in all dive modes Read more about Mode Setup on page 63 1 1 Notes on this manual This manual provides operating instructions for the Perdix 2 dive computer in technical operating mo...

Page 6: ...1 mbar of pressure corresponds to approximately 1 cm 0 4 of water So when at sea level the Perdix 2 will automatically turn on and enter dive mode when about 0 9 m 3 ft underwater If at higher altitud...

Page 7: ...out remembering all the button rules below Button hints make using the Perdix 2 easy SELECT right button SURFACE hr mn 15 Save Brightness Med Change 2 0 DEPTH TIME 1 2 PPO2 MENU hint SELECT hint MENU...

Page 8: ...e Decompression tissues are not tracked in this mode 2 4 Changing between Modes By default the Perdix 2 is set to 3 GasNx Mode Recreational focused modes can be distinguished by the large font layout...

Page 9: ...allow the buckle to slide freely on the straps Strap width is 3 4 19mm 3 2 Shock Cord Bungee or shock cord can be installed in many ways on the Perdix 2 The Perdix 2 s holes are sized for 3 16 cord Sh...

Page 10: ...use during recreational air only no decompression diving activities Air 21 oxygen only not switchable underwater Nitrox Single Gas Designed for use during recreational Nitrox no decompression diving...

Page 11: ...ation The following section goes into detail about each screen element TIME TTS OC 15 40 0 56 O2 HE NDL 1 15 PPO2 67 0 22 39 1 DEPTH TIME STOP Top Row Depth Time Deco Stops Center Row Configurable Bot...

Page 12: ...units feet or meters This is the shallowest depth to which you can ascend The last item on the right in the top row time is how long in minutes to hold the stop Decompression Stop Violated Decompressi...

Page 13: ...TIME 56 22 39 1 SurGF 83 STOP TTS OC 15 40 O2 HE NDL DEPTH TIME MAX m PPO2 61 0 1 15 0 70 TIME 56 22 39 1 7 SurGF 83 All 3 locations configurable in OC Tec mode In OC Tec mode center row information...

Page 14: ...me To Surface TTS The time to surface in minutes This is the current time to ascend to the surface including the ascent plus all required deco stops TTS OC 15 40 0 56 O2 HE NDL CC OC BO OC Open circui...

Page 15: ...AX AVG 57 PPO2 1 15 PPO2 1 42 PPO2 1 15 67 0 22 39 1 DEPTH TIME STOP 71 6 76 m 9 Mini NDL Replacement Display The Mini NDL replacement display option reconfigures the right side of the bottom row to a...

Page 16: ...nt varies for each mode For example decompression related info screens are not available in gauge mode The next section gives detailed descriptions of the data elements shown on the info screens 3 00...

Page 17: ...ilable when compass feature is turned on See the Compass section on page 38 for more information Maximum Depth The maximum depth of the current dive When not diving displays the maximum depth of the l...

Page 18: ...age Turns Yellow when greater than 90 Turns Red when greater than 150 The CNS percentage is calculated continuously even when on the surface and turned off When deco tissues are reset the CNS will als...

Page 19: ...itically low and must be replaced as soon as possible Also shows battery type Gradient Factor The deco conservatism value when the deco model is set to GF The low and high gradient factors control the...

Page 20: ...info row For open circuit diving the gas density display turns yellow at 6 3 grams per liter No other warnings are generated For closed circuit diving the gas density display turns yellow at 5 2 gram...

Page 21: ...stack time will show in inverted yellow and the STACK TIME WARN notification will be triggered When the stack time remaining is less than 30 minutes the remaining stack time will flash red and the ST...

Page 22: ...that are supersaturated above ambient pressure are shown in yellow and tissues that are supersaturated above the M Value are shown in red Note that the scale for each tissue compartment is different T...

Page 23: ...i 1 Top Center 5 GF99 Change Save Mini 1 Setup Bottom Surf GF GF99 0 5 SfGF 0 4 8 Notifications This section describes the different types of notifications the computer may present the diver See the L...

Page 24: ...tification High PPO2 Warning Limitations Of Alarms All alarm systems share common weaknesses They can alarm when no error condition exists false positive Or they can fail to alarm when a real error co...

Page 25: ...OP TIME LOW PPO2 DEPTH TIME 7 9 Warning Confirm 18 GasPO2 52 6 9 STOP TIME FAST ASCENT DEPTH TIME 13 7 Warning Confirm 1 12 GasPO2 35 STOP TIME MISSED DECO STOP DEPTH TIME 13 7 42 15 2 Warning Confirm...

Page 26: ...IME 0 0 Error Confirm 21 GasPO2 Display Meaning Action to take The internal battery is low Replace the battery The decompression tissue inert gas loading has been set to default levels Plan repetitive...

Page 27: ...on a single source of information Deco Stop Violation If you ascend shallower than your current stop the decompression information will flash red Significant decompression stop violations will result...

Page 28: ...CC BO modes where some decompression is presumed the default is a more conservative 30 70 The system provides several settings that are more aggressive than the default Do not edit GF values until yo...

Page 29: ...ecompression predictions will be displayed as if the switch is about to occur in the next 5 seconds Divers can encounter longer than expected decompression stops as well as inaccurate time to surface...

Page 30: ...OC mode and that 21 O2 is selected 5 Descent As we pass through 10 meters the time to surface TTS shows one minute This shows that the computer is expecting the diver to ascend at approximately 10 me...

Page 31: ...Clear When we clear the last stop the stop depth and time is replaced by the Deco clear counter that begins counting up from zero We also see an NDL of 99 minutes again Once we surface the depth will...

Page 32: ...phone dive planning software for complex dives The on board deco planner is an effective tool for confirming computer settings produce a plan that meet your expectations 4 Pre Dive Prior to beginning...

Page 33: ...uple meters their inspired PPO2 has risen above the default warning value and the high PPO2 warning has been triggered Any button press will clear the primary notification but for PPO2 warnings the co...

Page 34: ...es and bailout gas requirements for the dive For closed circuit dives two decompression schedules will be generated A primary schedule for closed circuit deco and a bailout decompression schedule The...

Page 35: ...set point switch was enabled with a depth setting of 15m So as we descend past 15m the set point automatically switches from 0 7 to 1 3 8 Decreasing NDL As we descend deeper the NDL decreases The TTS...

Page 36: ...ases 14 Gas Switch Required We are now at 21m having completed a few more deco stops The gas is now displaying in yellow indicating a better gas is available 15 Gas Switch Pressing left MENU button br...

Page 37: ...ing starting or stopping the Stopwatch is the first menu option When stopped the word Stopwatch displays in red When non zero the stopwatch can be reset Reset behavior depends on state If running when...

Page 38: ...d magnetic variation is the difference between magnetic and True North This can be compensated in the Compass Setup menu using the True North setting The magnetic declination varies around the world s...

Page 39: ...critical gas pressure warnings 9 1 What is AI AI stands for Air Integration On the Perdix 2 this refers to a system that uses wireless transmitters to measure the gas pressure in a SCUBA tank and tra...

Page 40: ...used Position the transmitter such that it is on the same side of your body as you wear your Perdix 2 handset Range is limited to approximately 1 m 3 ft A high pressure hose may be used to relocate th...

Page 41: ...dy All communications are coded with this number so that the source of each pressure reading can be identified When AI Mode is set to Off the AI sub system is completely powered down and does not cons...

Page 42: ...itored for longer than that we suggest 10 15 seconds to ensure the tank valve is open Including a regulator purge test followed by 10 15 seconds of air pressure monitoring before entering the water as...

Page 43: ...Communication Warnings Low Transmitter Battery Warnings Reserve Pressure Critical Pressure No communication for 30 to 90 seconds No communication for more than 90 seconds Transmitter battery should b...

Page 44: ...tle indicates which transmitter is being used for the SAC calculations in a dark gray font SM indicates that Sidemount SAC is selected The tank s included in the SAC calculation are selected in the AI...

Page 45: ...nu by setting the GTR Mode option to the desired SM combination Use Identical Tanks For Sidemount Sidemount features were designed assuming the sidemount tanks are of identical volume This removes the...

Page 46: ...nsmitters that can be run concurrently For more details see the Swift Operating Instructions Manual Using Multiple Transmitters With The Same Transmission Interval May Result in Lost Comms When using...

Page 47: ...easy to setup incorrectly SAC has the great property of not requiring any setup making it the simplest and most reliable choice The drawback is that it is not transferable between tanks of different s...

Page 48: ...g Why is GTR limited to no deco Currently Shearwater does not believe that GTR is the proper tool for decompression dives especially those involving multiple gases This isn t to say AI in general is n...

Page 49: ...Bring the handset within range 1m 3ft of the transmitter Having the transmitter too close less than5 cm 2 inches can also cause communication loss If the No Comms is intermittent Search for sources of...

Page 50: ...rsus on a dive The most commonly used menu items are placed first in the main menu to reduce button presses In the following section each item will be covered in detail Adaptive Menus Only menus neces...

Page 51: ...e only Dive Setup Dive Log Surface only Delete All Logs Compass Main Menus Turn Off Main Screen Select Gas Start Bluetooth System Setup Define Gas Deco Planner NDL Display Conserv Brightness Display L...

Page 52: ...TIME SURFACE 1h38m Start Timer 0 0 v 21 GasPO2 DEPTH TIME SURFACE 1h38m Stop Timer 0 0 v 21 GasPO2 DEPTH TIME SURFACE 1h38m Setpoint Switch This menu is only available in CC mode Switch 7 1 3 0 0 DEP...

Page 53: ...e 29 for more information If you increment past the number of gases available the display will fall back out of the Select Gas Radio Station Gases For closed circuit mode the system maintains two sets...

Page 54: ...he active gas is shown with a white background Turned off gases are shown in Magenta purple Gases are sorted from highest O2 to lowest O2 When diving and there is a deco stop the first gas pointed to...

Page 55: ...n diving The values in Dive Setup can also be accessed in the Systems Setup menu but the System Setup menu is not available when diving Pressing the right SELECT button will enter the Dive Setup sub m...

Page 56: ...n off the active gas in the Define Gas menu If you try it will generate an error You can edit it but cannot set both the O2 and HE to 00 Setting any gas to 00 00 will automatically turn it off The com...

Page 57: ...xit item to leave the Define Gas Menu when finished Set Gas Select to New in Adv 1 to use New Style Define Gas menu Press Next to increment to next gas Press Change to toggle the gas on Press Change i...

Page 58: ...SURFACE 2h45m Deco Planner Menu Change Next Enter Bottom Time OC in minutes Min 5 Max 180 Depth Time RMV 040 15 020 Exit Plan Ready to Plan Dive OC GF 30 70 Last Stop 3m Start CNS 0 Depth Time RMV 04...

Page 59: ...1534 Open circuit gas usage summary For closed circuit plans a bailout plan based on the programmed bailout gases will automatically be generated after the closed circuit deco summary A Quit Next 045...

Page 60: ...ini Note that the Mini NDL replacement display can be selected but not configured in this Menu and has a special appearance Read more about Mini NDL Replacement Display on page 15 Conserv 30 70 DEPTH...

Page 61: ...Display Display Log 21 GasPO2 SURFACE 2h45m Display Log Use this menu to display a list of logged dives and view details Dive Log 43min 01 Jan 1 Next View 22m 50min 01 Jan 2 18m 08 Aug 2015 Back 28 2m...

Page 62: ...d for both firmware uploading and dive log downloading Use this option to initialize Bluetooth on your dive computer DEPTH TIME 0 Next Exit Next Log 0004 21 GasPO2 SURFACE 2h45m DEPTH TIME 0 Next Edit...

Page 63: ...Setup Salinity Water type salinity affects how the measured pressure is converted to depth Settings Fresh EN13319 default Salt Density of freshwater and saltwater differ by about 3 Saltwater being den...

Page 64: ...Up The Confusion About Deep Stops and Understanding M values The articles are readily available on the web VPM B has conservatism settings from 0 to 5 with higher numbers being more conservative Also...

Page 65: ...er Setup Every transmitter has a unique 6 digit serial number This number is etched onto the side of the transmitter Enter the serial number to pair the transmitter to T1 This number only needs to be...

Page 66: ...customized per tank The options are First Character T S B O or D Second Character 1 2 3 or 4 Unpair The unpair option is simply a shortcut to reset the serial number to 000000 When not using T1 or T2...

Page 67: ...bring you to the Mini Display Setup Menu for that mini display Note that not all mini displays will show units due to space constraints 11 5 OC Gases BO Gases This menu allows the user to edit the ope...

Page 68: ...ent rapid automatic switching between setpoints for small depth changes The values 0 7 and 1 3 are shown as examples only Other values for the low and high setpoint can be adjusted in the Dive Setup o...

Page 69: ...ff state the surface pressure is measured and saved every 15 seconds A 10 minute history of these pressure samples is kept Immediately after turn on this history is examined and the minimum pressure i...

Page 70: ...ns as possible in 15 seconds Compass Calibration Tips The following tips will help ensure a good calibration Stay away from metal especially steel or iron objects For example wrist watches metal desks...

Page 71: ...o Battery Info Regulatory Info Done Edit Advanced Config Advanced Config 1 Main Colour Main colours can also be changed for added contrast Default is white but can be changed to green or red Title Col...

Page 72: ...to this value Default 1 61 Suggested gas switches when the current gas is displayed in yellow are determined by this value If you change this value please be sure you understand its effect For example...

Page 73: ...9h 59m The stack timer can be set to count down either when diving or when the computer is ON A warning will alert the diver when the stack timer has 1h remaining and an alarm will be displayed when t...

Page 74: ...oud Desktop On your Perdix 2 start Bluetooth by selecting the Bluetooth menu item from the main menu Upgrading the firmware resets decompression tissue loading Plan repetitive dives accordingly During...

Page 75: ...date Firmware from the connect tab Shearwater Cloud Desktop will automatically select the latest available firmware When prompted select your language and confirm the update The Perdix 2 screen will g...

Page 76: ...t Download Dives A list of dives will be generated and you can un select any dive logs you don t want to download then press OK Shearwater Cloud will transfer the dives to your smart phone Update Firm...

Page 77: ...ss thread the battery cap s threads Tighten the battery cap until snug and the Perdix 2 powers on Do not over tighten the battery cap NOTE Battery cap O rings are Type 112 Buna N 70 durometer Battery...

Page 78: ...repetitive dives Like the clock the decompression tissue loading is saved every 16 seconds to permanent memory when on and every 5 minutes when off When the battery is removed the tissues remain store...

Page 79: ...rvice centers Contact Info shearwater com for service requests Shearwater recommends service of all dive computers every 2 years by an authorized service center Evidence of tampering will void your wa...

Page 80: ...m X 38mm 18 Regulatory Information A USA Federal Communications Commission FCC This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of FC...

Page 81: ...r radio equipment and services Part 1 Common technical requirements ETSI 301 489 17 V3 2 4 2020 ElectroMagnetic Compatibility EMC standard for radio equipment and services Part 17 Specific conditions...

Page 82: ...2 Doc 13301 Tec RevB 2022 05 25 Technical Modes Operating Instructions 19 Contact www shearwater com contact Headquarters 100 10200 Shellbridge Way Richmond BC V6X 2W7 Tel 1 604 669 9958 info shearwat...

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