Hollis PRISM 2 User Manual
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Hollis PRISM 2 User Manual

Ver.2 displays and electronics
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Ver. 2 Displays
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  • Page 1 Ver. 2 Displays And Electronics User Manual L I M I T REV. 2...
  • Page 2 Hollis Inc. All information contained is subject to change. Contact the manufacturer for the latest information. www.hollisgear.com The PRISM 2 is manufactured in the USA by Hollis Inc., 2002 Davis Street, San Leandro, CA 94577. USA Ph (510) 729-5100 EC Type approved by SGS UK Ltd.
  • Page 3 Hollis PRISM 2 rebreather. This includes new PRISM 2 divers as well as PRISM 2 certified divers who have been away from diving for an ex- tended period of time and would benefit from an instructor-led refresher course to regain skills mas- tery of the Hollis PRISM 2.
  • Page 4 ! WARNING: PROPER BATTERIES Only name-brand batteries (such as Duracell, Eveready; Saft) may be used to power the PRISM 2. Off- brand / Discount batteries have been found to vary greatly in quality of materials from batch to batch (and even piece to piece!) Therefore they may not perform as expected, or be capable of consistently delivering the power required to drive the components, despite battery voltage levels reported by a bat- tery voltage meter.
  • Page 5 ! WARNING: As with all underwater life support equipment, improper use or misuse of Hollis computers can result in serious injury or death. ! WARNING:...

  • Page 6: Table Of Contents

    TABLE OF CONTENTS General Safety Statements & Warnings iii-v SECTION 8 COMPLEX DIVE EXAMPLE PART 1 SECTION 9 WELCOME DECOMPRESSION & GRADIENT FACTORS SECTION 10 PART 2 GRADIENT FACTORS EXPLAINED DIVECAN® SECTION 11 SECTION 1 VPM-B / GFS EXPLAINED WHAT IS DIVECAN®? SECTION 2 SECTION 12 DIVECAN®...

  • Page 7: Part 1 Welcome

    This manual will walk you through all the basics as well as the subtleties of the displays and electronics. For complete understanding of the PRISM 2, use this manual in conjunction with the main PRISM 2 User Manual doc. # 12-4072.

  • Page 8: Part 2 Divecan

    Divecan® What is divecan®? DiveCAN® is a digital communications standard developed specifically for rebreathers. Rebreather SOLO OBOE & xygen xygen electronics) lectronics) ® ® Control Bus Monitor Bus DiveCAN DiveCAN Future Device Wrist Display LED HUD CONTROLLER DiveCAN® connections allow rebreather components to communicate. A minimum configuration has a Control Bus with a handset connected to rebreather electronics (“bus”...

  • Page 9: Divecan® Advantages

    divecan® Advantages The DiveCAN® standard was designed to improve rebreather electronics. It offers the following advantages over the previous generation of analog wiring: Robust error-checked communications. A message is either received correctly or it isn’t. Compare this with analog wiring where corrosion or poor connections can result in incorrect data being used.

  • Page 10: Part 3 Hud (Heads Up Display)

    DO NOT make assump- tions about how this device works, even if you have used a pre- vious generation HUD. Some of the blink patterns and warnings have changed from previous PRISM 2 HUD versions. FEATURES • PPO display from 3 oxygen sensors.

  • Page 11: Physical Description

    Physical description DiveCAN® cable LED array Buddy warning light Wet contacts LED array An array of colored light emitting diodes (LEDs) blink to display PPO For color-blind users, there is an optional blink pattern that uses position only to display PPO Buddy warning light The buddy warning light pulses red when PPO is outside a safe range.

  • Page 12: Reading The Ppo

    Reading the pp0 LED ARRAY DESIGN The default blink pattern is a modified Smither’s code, similar to the previ- ous generation HUD. See PART 3 Section 7 for the optional colorblind mode. What does the HUD display? is displayed in units of absolute atmospheres (ata) with a resolu- tion of 0.1 ata.
  • Page 13 MODIFIED SMITHER’S CODE This is the default blink pattern. Blinks of color are used to display PPO Every 5 seconds a blink cycle begins. The blink pattern depends on the PPO range: Range HUD Display Blink Pattern Top-red blinks once for each 0.1 above 1.0 Above 1.6 e.g.

  • Page 14: Detecting Abnormal Ppo

    Detecting abnormal PPO The modified Smither’s code has some nice attributes that grab attention in abnormal or unsafe situations. DEVIATIONS FROM SETPOINT A typical rebreather PPO setpoint will be about 0.7 to 0.8 for the low set- point, and 1.2 to 1.3 for the high setpoint. Therefore, when the loop is at setpoint, you will expect to see 2 to 3 blinks per 5 second cycle.
  • Page 15 Basic commands Commands are entered using the wet contacts. Activate the wet contacts by connecting them with a conductive material (Fig. 3.4). This can be: • A wet finger • Water • A coin • A piece of metal, etc. Wet contacts Wet finger Fig.
  • Page 16 DOUBLE TAPPING Enter commands by double-tapping the wet contacts (3.6). It should take about 1 second to complete the double-tap. “Tap” “Tap” Wet finger Fig. 3.6 NOTE: Taps that are too fast or too slow will be ignored. Saying “tap-tap” aloud at a normal pace will help get the timing right. After the first double-tap, the bottom two LEDs of column 1 will blink.
  • Page 17 3 seconds while on command column 3 (Fig. 3.9). The complete calibration sequence is: 1. Flood the loop with pure oxygen as per training and PRISM 2 manual. 2. Double-tap to enter 1st command column (MENU). Fig. 3.9 3.
  • Page 18 ADJUSTING FOR ALTITUDE Oxygen sensor calibration results are not stored in the HUD itself. Instead it is stored in the rebreather electronics contained in the PRISM 2 scrubber head. Using the advantages of the DiveCAN® system, you can access and adjust for altitude in a clever way.

  • Page 19: Error Displays

    #3 has failed. DO NOT dive unless all sensors Other columns normal are functional. NO COMMUNICATIONS HUD Display Description Troubleshooting Ensure the DiveCAN® cable No DiveCAN® connector is securely fastened. Communications Contact Hollis for service. Four corners blinking | 13...
  • Page 20 A typical rebreather will have two independent battery systems. One bat- tery system for the primary oxygen controller side, and one battery system for the backup monitoring side. On the PRISM 2 This HUD is part of the backup monitoring side.

  • Page 21: Advanced Options

    Advanced options There are two options that can be set by the user. 1.) Choosing the PPO blink pattern. 2.) Flipping the orientation to the other side of the rebreather mouthpiece. Enter the Advanced Options menu by executing the MENU command 3 times.
  • Page 22 COLOR BLIND CODE The optional color blind blink pattern uses positioning of the LEDs to indicate PPO . Every 5 seconds a blink cycle begins. The blink pattern depends on the PPO range: Range HUD Display Blink Pattern Top row blinks once for each 0.1 above 1.0 Above 1.6 e.g.
  • Page 23 FLIP ORIENTATION The orientation can be flipped so that the HUD can be positioned on either side of the rebreather DSV/BOV. The default orientation has the cable Fig. 3.11 exiting to the right (Fig. 3.11). Use the Advanced Option Menu , column 3 selected to flip the HUD (Fig.

  • Page 24: Part 4 Wrist Display

    Wrist display Buttons and activation To turn the wrist display on, press both the MENU (left) and the SELECT (right) buttons at the same time. The two piezo-electric buttons are used to change settings and view menus. Except for turning the wrist display on, all operations are simple single but- ton presses (Fig.
  • Page 25 DEPTH TIME SURFACE NOTE: When in a menu, button hints label each button. For exam- ple, these hints (Fig. 4.2) tell us: .70 .71 .70 - Use MENU to “Change” the brightness value. - Use SELECT to “Save” the current value. Brightness Change Save...

  • Page 26: The Main Screen

    The main screen The main screen shows the most important information needed for techni- cal diving (Fig. 4.3). Top Row: Depth, Time, & Deco Stops Center Row: Fig. 4.3 Bottom Row: Mode, Gas, & Deco Information COLOR CODING Color coding of text draws attention to problems or unsafe situations. Fig.
  • Page 27 Ascent Bar Graph Fig. 4.11 Shows how fast you are currently ascending. Imperial: 1 arrow per 10 feet per minute (fpm) of ascent rate. Metric: 1 arrow per 3 meters per minute (mpm) of ascent rate. Fig. 4.12 White when 1 to 3 arrows (Fig. 4.11), Yellow when 4 to 5 arrows (Fig. 4.12), and Flashes Red when 6 arrows or more (Fig.
  • Page 28 Surface Interval When on the surface, the STOP DEPTH and TIME are replaced by a sur- face interval in the top right corner of the display (Fig. 4.21). Shows the hours and minutes since the end of your last dive. Above 4 days, the surface interval is displayed in days.
  • Page 29 THE BOTTOM ROW The bottom row displays the current mode, gas and decompression infor- Fig. 4.28 mation (Fig. 4.28). Circuit Mode Fig. 4.29 The current breathing configuration. One of: OC = Open circuit, bailout so it displays in Yellow (Fig. 4.29). CC = Closed circuit (Fig.
  • Page 30 Time-to-Surface (TTS) The time-to-surface in minutes (Fig. 4.38). This is the current time to as- cend to the surface including the ascent plus all required deco stops. Fig. 4.38 Assumes: •Ascent rate of 33 feet per minute (10 meters per minute). •Decompression stops will be followed.

  • Page 31: Info Screens

    Info screens Info screens provide additional information that does not fit on the main screen. Info screens display on the bottom row . Press SELECT (right) button to step through the info screens. SELECT button SELECT button SELECT button Starting from the main screen, the SELECT (right) button steps through the info screens.
  • Page 32 directly, but calculated as the fraction of O in the diluent multiplied by the current depth’s pressure. Displays in Flashing Red when the PPO of the diluent is less than 0.19 or greater than 1.65. When performing a manual diluent flush, you can check this value to see what the expected PPO will be at the current depth.
  • Page 33 AVERAGE DEPTH Displays the average depth of the current dive, updated once per second. Fig. 4.50 When not diving, shows the average depth of the last dive (Fig. 4.50). AvgATM 2.52 AVERAGE DEPTH IN ATMOSPHERES (AVG ATM) Fig. 4.51 The average depth of the current dive, measured in absolute atmospheres (i.e.
  • Page 34 TISSUES BAR GRAPH Some Sample Tissues Graphs The tissues bar graph shows the tissue compartment inert gas tissue tensions based on the Bühlmann ZHL-16C model. On surface (sat. with air) 16 tissue compartments After descent Inspired inert M-Value pressure gas pressure Ambient pressure Increasing pressure On-gassing...
  • Page 35 EXTERNAL BATTERY (EXT V) EXT V 8.6V The voltage of the external battery used to fire the solenoid (Fig. 4.58). Flashing Red when the battery is critically low and must be replaced as Fig. 4.58 soon as possible. EXT V Only sampled when solenoid is fired, so if solenoid has not yet fired, value is unknown and displays as a Yellow ? (Fig.
  • Page 36 SERIAL NUMBER & VERSION SERIAL NO VERSION 1234ABCD 2OOOO12 Each Wrist Display has a unique serial number. Fig. 4.67 The version number indicates the available features. The last two numbers are the firmware version (V12 in this image) (Fig. 4.67). 30 |...

  • Page 37: Menus

    Menus Press MENU (left) button to step through the menus. Press SELECT (right) button to execute command or enter sub-menu . Menus display on the bottom row . MENU button SELECT button Petrel Turns Off MENU button SELECT Enter button Calibrate sub-menu MENU button...

  • Page 38: Menu Structure

    Menu structure Main Screen Turn Off Surface only Calibrate Surface SUB-MENUS only Switch .7 > 1.3 Dive Planner+ Edit Low SP Conserv. Edit High SP Select Gas NDL Display Define Gas Switch CC > OC Brightness Dive Setup+ Display Log Upload Log Dive Log+ Surface...

  • Page 39: Basic Setup

    Basic Setup Before using the computer there are several things that need to be con- figured. This is not an exhaustive list of the pre-requisites for diving the system, but a suggestion of key tasks. Calibrate the oxygen sensors if needed. If calibration is not needed, then we recommend verifying the PPO at multiple points.

  • Page 40: Simple Dive Example

    Simple Dive Example The following is a simple rebreather dive that includes decompression stops. In this example: Diluent: Air Max Depth:125 feet for 42 minutes Dive Phase Description Display The mode is set to CC and the diluent is set to air (21/00).
  • Page 41 Simple Dive Example (continued) Dive Phase Description Display Once the NDL hits 0, deco stops will be needed, which display in the top-right corner. Deco Also, note that the NDL location is now displaying ad- Needed ditional info, in this case @+5. TTS has increased to include deco stop time.

  • Page 42: Complex Dive Example

    Complex Dive Example The following is a more complex rebreather dive that includes multi-gas OC bailout. In this example: Diluent: Trimix (10/50) Max Depth: 90 meters for 20 minutes Bailout gases: 10/50, 21/00, and 50/00 Dive Phase Description Display Best practices include checking your gas lists before each dive.
  • Page 43 Complex Dive Example (continued) Dive Phase Description Display Use the dive planner to check the total runtime, decom- pression schedule and bailout out gas quantity needed. For CC dives, both the closed-circuit (CC) and bailout Plan Dive (BO) plans are displayed. The bailout plan also includes &...
  • Page 44 Complex Dive Example (continued) Dive Phase Description Display The optional auto setpoint switch was enabled with a Auto depth setting of 15 m. Setpoint So as we cross 15 m on the descent, the setpoint auto- Switch matically switches from 0.7 to 1.3. As we descend deeper, the NDL decreases.
  • Page 45 Complex Dive Example (continued) Dive Phase Description Display After physically switching the BOV or mouthpiece, the computer needs to be set to OC mode for proper deco calculations. Two presses on MENU brings up the "SWITCH CC -> OC" menu. Pressing SELECT makes the change. Note that the loop PPO continues to display.

  • Page 46: Decompression & Gradient Factors

    Decompression & Gradient Factors The basic decompression algorithm used for the computer is Bühlmann ZHL-16C. It has been modified by the use of Gradient Factors that were developed by Erik Baker. We have used his ideas to create our own code to implement it.

  • Page 47: Gradient Factors Explained

    GRADIENT FACTORS EXPLAINED BY: KEVIN WATTS This primer attempts to provide a user’s view of gradient factors, an Erik Baker derived method of calculating decompression schedules. BACK TO BÜHLMANN Everything in the gradient factor decompression algorithm revolves around Dr. Albert A. Bühlmann’s tissue model. Currently this means 16 hypotheti- cal tissue compartments that are constantly tracked during a dive in order to determine each tissue compartment’s inert gas pressure.
  • Page 48 GFs”. So, let’s say you want to first ascend to a GF=0.30, and then slowly move to reach GF=0.85 as you surface. This setting on your gradient factor computer is 30/85. The PRISM 2 wrist unit uses 30/85 as its default setting.
  • Page 49 Once you determine your two points, the formula for the maximum GF at any depth is: HighGF - LowGF MaxGF = HighGF + _______________________________ Current Depth HighGFDepth - LowGFDeptrh But since the high gradient factor is reached at the surface, HiGFDepth=0. HighGF - LowGF MaxGF = HighGF + ________________________ Current Depth LowGFDepth...
  • Page 50 The gradient factor method is a natural extension of Bühlmann’s tissue compartment model. Divers using computers implementing the gradi- ent factor method should understand how modifying their GF parameters would alter the decompression profiles. You must consider altering your GF parameters based on dive characteristics, your physical condition, and your general attitude toward the risk of decompression illness.

  • Page 51: Vpm-B / Gfs Explained

    VPM-B / GFS EXPLAINED NOTE: The VPM-B algorithm requires an activation code which can be purchased at additional expense. To activate the VPM-B decompression algorithm, contact your Hollis Dealer. A. VPM-B PROFILE B. VPM-B/GFS PROFILE • Gradient Factor Surfacing (GFS) adds conservatism to the shallow stops of a VPM-B profile.

  • Page 52: Menu Reference

    Menu Reference DEPTH TIME STOP TIME TURN OFF The “Turn Off” item puts the computer to sleep (Fig. 4.68). While sleeping, .98 .98 .98 the screen is blank, but the tissue contents are maintained for repetitive diving. The “Turn Off” menu item will not appear during a dive. It will also Turn Off not appear after a dive until the End Dive Delay time has expired to allow for a continuation dive.
  • Page 53 DEPTH TIME STOP TIME CALIBRATION PROBLEMS .98 .97 FAIL One sensor displays FAIL after calibration (Fig. 4.72) O2/HE CC 21/OO This could indicate a bad sensor. It has failed because the mV output was not in range. The sensor could be old or damaged, and should be in- Fig.
  • Page 54 DEPTH TIME SURFACE fine the PPO value of a setpoint, use the Dive Setup menu. This menu item performs a manual switching of PPO setpoint. Automatic .87 .86 .84 setpoint switching can be setup in the System Setup → Auto SP Switch menu.
  • Page 55 With radio station gases, when you are in open circuit, adding, deleting or selecting a gas will refer to an open circuit gas. Just like the FM stations are selected when your radio is in FM mode, the closed circuit gases are available in the closed circuit mode.
  • Page 56 DEPTH TIME SURFACE SWITCH TO OC/CC Switch CC > OC Depending on the current computer setting, this selection will show as either “Switch CC > OC” (Fig. 4.87) or “Switch OC > CC” (Fig. 4.88). Fig. 4.87 Pressing SELECT will select the displayed mode for decompression calcu- DEPTH TIME SURFACE...
  • Page 57 DEPTH TIME SURFACE If SELECT is pushed, the currently displayed setpoint will be selected, and .85 .86 .84 the display will return to the “Edit Low SP” menu item. Edit Low SP 1.5 If the highest allowable value, 1.5 (Fig. 4.93), has been passed, the value Next Edit will return to 0.5.
  • Page 58 DEPTH TIME STOP TIME .85 .86 .84 Each push of the MENU button will increment the digit being edited. When the digit reaches 9, it will roll over to 0 (Fig. 4.99). 2 OC On 5O/OO Change Next Pushing SELECT will lock in the current digit, and move on to the next digit Fig.
  • Page 59 DIVE PLANNER+ Introduction • Calculates decompression profiles for simple dives. • In closed-circuit (CC) mode, also calculates open-circuit (OC) bail-out (BO). Setup Uses the current gases programmed into the wrist display, as well as the current GF low/high settings. VPM-B dive planning is available on units with the optional VPM-B unlock.
  • Page 60 For CC, the PPO is constant for the entire dive. The RMV is the same while diving as during deco. Semi-closed uses a metabolic offset. The Dive Planner does not provide thorough validation of the profile. For Fig. 4.105 example, it does not check for nitrogen narcosis limitations, gas usage limitations, CNS percentage violations, or isobaric counter-diffusion risks due to sudden helium switches.
  • Page 61 DEPTH TIME STOP TIME NDL DISPLAY The NDL Display option allows you to display four different values during .85 .86 .84 the dive (Fig. 4.111). The display can be changed during the dive to pro- NDL Display NDL vide different information. Next Edit Pushing SELECT will make the NDL display editable.
  • Page 62 feet or 3 meters. So a gradient of 40 may reflect a ceiling of 15 feet, but the computer will show a rounded-up 20 foot stop. GRAPH FROM ERIK BAKER’S “CLEARING UP THE CONFUSION ABOUT DEEP STOPS” Pressure Graph: Gradient Factors GF Lo M-value generates...
  • Page 63 All of this is based on gradient theory that may be completely false. There is significant disagreement in the decompression research community about the nature and practice of decompression. Any techniques de- scribed here should be considered experimental, but the concepts may be useful to the advanced diver.
  • Page 64 DEPTH TIME STOP TIME For example, here sensor 3 has failed voting. The PPO is displayed in yel- low to show that it has failed voting (Fig. 4.118). The system average PPO .96 .97 1.26 is the average PPO of sensor 1 and 2. DilPO2 AvgPO2 If all sensors fail voting, then the display will alternate VOTING FAILED with...
  • Page 65 DEPTH TIME STOP TIME SETPOINT -> .19 Pressing SELECT when this menu is displayed changes the PPO setpoint .85 .86 .84 to 0.19 (Fig. 4.123). This menu is only available when on the surface. Setpoint -> .19 This feature is provided as a convenience to prevent the solenoid from firing when setting up the rebreather on your workbench.
  • Page 66 Upload Log See “Firmware Upload and Dive Log Download” instructions. Logs are uploaded using Bluetooth. Selecting this menu item starts the Bluetooth connection and then waits for commands from a desktop or laptop computer. Edit Log Number DEPTH TIME STOP TIME The dive log number can be edited.
  • Page 67 Example Menu Once the user has pressed SELECT to edit a submenu listing, the MENU button will be used to change the context sensitive variable, while the SE- O.OO ‣Example LECT button will be used to move to the next field (Fig. 4.130). Once the O.OO Example O.OO...
  • Page 68 available on the web. VPM-B has conservatism settings from 0 to +5, with higher numbers being more conservative. Last Stop Allows you to choose where to do your last stop. The choices are 10 ft/3 m and 20 ft/6 m. Note that this setting does not affect decompression. It only makes the TTS prediction more accurate.
  • Page 69 Cal. FO This setting allows you to set the fraction of oxygen (FO ) of the calibration gas. The calibration gas FO can be set from 0.70 to 1.00. The default value of 0.98 is for pure oxygen, but assumes about 2% water vapor due to the diver’s breathing on the loop during the flushing process.
  • Page 70 Auto SP Switch above 41 ft, it switches “down” to 0.7. Auto O.7>1.3 When a switch is set to “Auto”, you can always manually override the set- O7Oft Up Depth ting at any time during the dive. Manual ‣Down: 1.3>O.7 Each auto setpoint switch can occur only once per dive.
  • Page 71 Display Setup Altitude The altitude setting when set to ‘Auto’ will compensate for pressure chang- Feet Units es when diving at altitude (Fig. 4.143). If all your diving is at sea level, then Auto Brightness Auto ‣Altitude setting this to ‘SeaLvl’ will assume that surface pressure is always 1013 Flip Screen mBar (1 atmosphere) (Fig.
  • Page 72 System Setup Date 14-Aug-2O12 12:28PM Time Unlock Code ‣Unlock Load Upgrade The next ‘System Setup’ changeable option is ‘Unlock’ (Fig. 4.148), which Reset to Defaults allows the user to enter in an unlock in order to change models and to set Next Unlock other features (Fig.
  • Page 73 connected together into one dive. Some instructors use a longer end dive delay when teaching courses. Alternatively, a shorter time can be used to exit dive mode more quickly upon surfacing. Battery Icon The behavior of the battery icon can be changed here. Options are: Surf+Warn: The battery icon displays always when on the surface.
  • Page 74 in use at a given depth is the gas with the highest PPO that is less than or equal to this value. Also, the suggested gas switches (when the current gas is displayed in yellow) are determined by this value. If you change this value, please understand its effect.

  • Page 75: Firmware Upload & Dive Log Download

    Firmware Upload & Dive Log Download Bluetooth communications are used for both Firmware Uploading and Dive DEPTH TIME STOP TIME Log Downloading. NOTE: Upgrading the firmware resets decompression tissue load- Upload Log ing. Plan repetitive dives accordingly. Next Upload Start a Bluetooth connection by selecting the Upload Log menu (Fig. Fig.
  • Page 76 The wrist display screen will give percentile updates of receiving the firm- ware (Fig. 4.161), then the Personal Computer will read “Firmware suc- cessfully sent to the computer” (Fig. 4.162). After receiving the new firmware, the wrist display will reset and display a message stating either firmware update success or failure.

  • Page 77: Changing The Battery

    Changing the Battery NOTE: A large coin or washer is required for this section. Turn off the wrist display It is a good practice to turn off the wrist display before removing the bat- tery. If removed while on, then there is a small chance (about 1 in 5000) that the deco tissues will be corrupted.
  • Page 78 BATTERY TYPES After changing the battery, a screen will prompt for the battery type to be entered. The wrist display attempts to guess what type of battery is being used. If the battery type is incorrect, it should be manually edited. Having the bat- tery type set correctly is important so that the wrist display can give low battery warnings at the proper voltage levels.

  • Page 79: Tissues Cleared

    Tissues Cleared Some conditions will cause the decompression inert gas tissue loadings to be cleared. When cleared, the tissues are set to being saturated with breathing air at the current barometric pressure. The wrist display does not lock-out when the tissues are cleared. If the tissues are cleared, then the diver must take appropriate cautions when planning repetitive dives.

  • Page 80: Error Displays

    Error Displays The system has several displays that alert an error condition. ! WARNING: All alarm systems share common weaknesses and limitations: • They can alarm when no error condition exists (false posi- tive). Or they can fail to alarm when a real error condition oc- curs (false negative).
  • Page 81 This reset shows up after a software update (Fig. 4.174). This is the nor- mal event that shows the computer has been rebooted after the software WATCHDOG RESET update. Fig. 4.173 This is not an exhaustive list. Please contact Hollis if you experience any DEPTH TIME STOP TIME unexpected errors.

  • Page 82: Part 5 Post-Dive Care

    There are no user serviceable parts inside the wrist display or HUD. Do not tighten or remove the wrist display faceplate screws. Service of the wrist display and HUD may only be done at Hollis, or by any of our authorized service centers.

  • Page 83: Part 6 Specifications

    Specifications Divecan® HUD Specification DiveCAN® HUD Function Display range 0.1 ata to 1.9 ata resolution 0.1 ata Crush Depth Limit 30 ata (~290 msw) Operating Temperature Range +4 °C to +32 °C Short-Term (hours) Temperature -20 °C to +50 °C Range Long-Term Storage Temperature +5 °C to +20 °C...

  • Page 84: Wrist Display

    Wrist display Specification DiveCAN® HUD Operating Modes Closed Circuit (CC) Open Circuit (OC, for bailout) Decompression Model Bühlmann ZHL-16C with GF VPM-B and VPM-B/GFS (op- tional) Pressure (depth) sensor Piezo-resistive Range 0 Bar to 14 Bar Accuracy ±20 mBar (at surface) ±100 mBar (at 14 bar) Crush Depth Limit 30 Bar (~290 msw)

  • Page 85: Part 7 Terms & Fcc

    TERMS & FCC Glossary Absorbent: chemical media used to remove CO from exhaled gas Bailout: redundant gas supply system BOV: bail out valve Breathing Loop: parts of the rebreather that breathing gas circulates within CCR (CC): closed circuit rebreather Diluent: a gas used for breathing volume and to reduce the fraction of oxy- gen in the Breathing Loop DiveCAN®: is a digital communications standard developed specifically for rebreathers...

  • Page 86: Fcc Warning

    FCC Warning 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 FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 87 NOTES | 81...
  • Page 88 United States Naval Sea Otters and other marine life in Monterey Surface Warfare Command, developed Bay. In 1970, Hollis made some of the first and delivered a unit called the “ATUBA” dives on the Electrolung rebreather using...

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