User manual SCUBAPRO-UWATEC OXY2

THE SYSTEM OPERATING MANUAL English Oxy2 SWISS MADE BY UWATEC AG English List of chapters Introduction . . . . . . . . . . . . . . . . . . . . . How to operate the Oxy2 . . . . . . . . . . . . . . Switching the unit on and off . . . . . . . . . . . . . Checking the remaining battery and O2-sensor lifetime Checking the Oxy2 . . . . . . . . . . . . . . . . . Pairing of the Oxy2 with a dive computer . . . . . . . Mounting the Oxy2 on a rebreather . . . . . . . . . Warnings and service messages . . . . . . . . . . . . O2 Sensors . . . . . . . . . . . . . . . . . . . . . Calibrating the O2 sensors . . . . . . . . . . . . Replacing the O2 sensors ............ Battery . . . . . . . . . . . . . . . . . . . . . . . Replacing the Battery ............. Maintenance and Storing ............. Technical Information / Features . . . . . . . . . . . Diving in Mountain Lakes . . . . . . . . . . . . . . Pressure Chamber Tests .............. Warranty . . . . . . . . . . . . . . . . . . . . . . Safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 6 6 7 9 10 11 13 14 17 21 21 24 25 26 26 26 28 3 English Introduction The Oxy2 is fitted "in line" to the inhalation hose of the semi closed rebreather (SCR) and measures the actual oxygen fraction of the inspired gas mixture. This information is displayed on the Oxy2 display and can be transmitted to a paired hoseless dive computer (Aladin® Air X O2). This is the basis for the calculation of both oxygen toxicity and decompression, based on the real values of the inhalation gas. Up to now the composition of the gas had to be estimated. The Aladin® Air X O2 calculates the diver`s oxygen metabolism using the measured oxygen fraction of the inhalation gas mix, plus the automatically determined oxygen fraction of the premixed gas and a value for the highest oxygen consumption you calculate with (programmed into the Aladin® Air X O2 with DataTalk software). Using these 3 values the diver`s workload is calculated on line and updated in real time. The significance of these calculations should not be underestimated because both the oxygen toxicity ­ measured by the CNS clock ­ and the speed of nitrogen diffusion in the muscles is affected by workload. Due to the higher workload the diver`s metabolism gets more activated and accelerates the nitrogen uptake. At the same time the oxygen fraction goes down due to the increased need for oxygen and the nitrogen fraction is increased. This means that a higher workload accelerates the uptake of the nitrogen and additionally the nitrogen fraction increases. This shows how important it is to know the composition of the inhalation gas, measured by the Oxy2. Only with this information can the diver have updated information (online) about decompression and oxygen toxicity. All this increases the safety of diving. 4 · Diving with a semi-closed rebreather (SCR) needs special education! · Please read this manual carefully to the end! · Before the first use, the O2 sensors have to be fitted and calibrated. See Page 17 and 14. How to operate the Oxy2 The user can operate the Oxy2 by using the 3 contacts and the turnable switch. The user has ­ similar to the Aladin dive computers ­ to bridge two contacts with moistened fingertips. turnable B Base contact, must to be touched for all user switch operations B E Enter contact, selects / confirms the current input S Switch contact, changes the settings Instruction for manual inputs. For example: Bridging the contacts B and E. Cal. Run Instruction for the turnable switch For example: The switch has to be in ,,RUN" position S E 5 English Switching the unit on and off Switching on Manually: by bridging contacts B and E . Automatically: by dip (dipping) into water. · The Oxy2 has to be switched on manually before the dive in order that it is checked. see page 7. Cal. Run After being switched on the unit first runs a display check ­ for the first 4 seconds all the display segments are displayed. Then the screen shows the current oxygen percentage. The turnable switch has to be in position "RUN". Switching off The unit automatically switches off if a dive has not commenced within 30 minutes of either switching on the Oxy2 or a calibration was done. 30 minutes gives the diver enough time to thoroughly check his equipment and to start the dive. After a dive the unit switches off automatically after 15 min.. Checking the remaining battery and O2 sensor lifetime The remaining battery lifetime can be checked ­ after the unit has been switched on ­ by connecting the contacts B and E . The display shows for 4 seconds the battery symbol and the remaining percentage of the battery lifetime and afterwards for another 4 seconds the O2 sensors remaining percentage lifetime. 6 Checking the Oxy2 Before each dive the Oxy2 has to be checked as follows: Remove the Oxy2 from your equipment and move it very slowly through the air for a few seconds. If the reading is within 20.9% ±0.2% O2 and if the ,,CAL" segment on the display is not visible, no further calibration is necessary. A recalibration is necessary if: · The reading shows less then 20.7% O2 · The reading shows more then 21.1% O2 · The ,,CAL" segment on the display is visible On page 14 is described how to calibrate the Oxy2. The O2 sensors have to be replaced if the display shows the sensor segment. See page 17. If there is no reliable measurement possible the unit shows the ,,CAL" segment and the sensor segment. First try a calibration. A sensor replacement may be necessary if the calibration is not successful. See page 17 (Replacing the O2 Sensors). 7 English The battery has to be replaced if the display shows the battery segment. See page 21 (Replacing the battery). Replace the battery if the remaining capacity would not be enough for the planned dives. Check that the Oxy2 is fitted to the inhalation hose of your rebreather! Check the communication between the Oxy2 and the dive computer before each dive! You will find more about the communication in the user`s manual of your dive computer. 8 Pairing the Oxy2 with a dive computer The Oxy2 sends every 5 seconds the actual oxygen values of the inhalation gas to an Aladin® Air X O2 or a compatible dive computer. The dive computer and the Oxy2 need to be paired to make sure that the dive computer receives and uses the data from its own Oxy2. A pairing is necessary: · Before the first dive of an Oxy2 with a dive computer · If you change from a pressure transmitter (air/nitrox) to an Oxy2 or the reverse · If you use a new Oxy2 or dive computer · After a change of the dive computer battery · Oxy2 and Aladin® Air X O2 must be paired if you change from using a pressure transmitter (air/nitrox) to an Oxy2! The Oxy2 sends a pairing string during switching on the unit and at the beginning of the battery and O2 sensor lifetime check. Make sure that the Oxy2 and the dive computer touch each other during all the pairing process, until after the pairing has been confirmed. See page 6 (Checking the remaining battery and O2 sensor lifetime). · You find more detailed information about pairing in the Aladin® Air X O2 manual. 9 English Mounting the Oxy2 to a rebreather The Oxy2 is fitted "in line" to the inhalation hose of the semi closed rebreather (SCR). The Oxy2 has to be mounted as shown below. This is the optimal position for transmission. Position for left side inhalation hose and lefthanders. Position for right side inhalation hose and lefthanders. Position for left side inhalation hose and righthanders. Position for right side inhalation hose and righthanders. · The Oxy2 may only be mounted into the inhalation hose of the semi-closed rebreather! Otherwise the calculation of decompression and the oxygen toxicity are based on wrong data and this could result in death or serious injury. 10 Warnings and service messages O2 sensor connection problems If there is no O2 sensor or only one connected, the ,,no" and the sensor symbol will be displayed. You will find how the sensors are connected on page 17 (Replacing the O2 Sensors). One O2 sensor measures wrong The Oxy2 continues to work but indicates the defect by displaying ,,CAL". The message also appears on the Aladin® Air X O2 display. Calibrate the Oxy2 after you have finished your dive (see page 14 ,,Calibrating the O2-sensors"). If this is not successful, you have to replace the O2 sensors. (see page 17 ,,Replacing the O2 Sensors") You can continue your actual dive if the display shows ,,CAL". Both O2 sensors measure wrong When a reliable measurement is not possible the sensor symbol and "CAL" appear on the displays of both the Oxy2 and the Aladin® Air X O2. When this happens the Oxy2 goes on measuring and indicating the oxygen fraction. At the same time the Aladin® Air X O2 switches for its calculations to the premix value which was automatically measured by the Oxy2. The dive computer then has to be used as though there is no Oxy2. It is recommended that an ascent is made. Calibrate the Oxy2 after the dive (see page 14 ,,Calibrating the O2 sensors"). If the calibration is not successful the O2 sensors have to be replaced. (see page 17) It is possible that the sensor symbol and ,,CAL" will disappear during the dive in which case recalibration is not required. 11 English Battery warning If the battery capacity reaches 0%, the battery symbol will be displayed. Replace the battery after the dive (see page 21 ,,Replacing the battery"). O2 sensor warning If the O2 sensor capacity reaches 0%, the sensor symbol will be displayed. Replace both sensors after the dive (see page 17 ,,Replacing the O2 sensors"). 12 O2 Sensors The O2 sensors have ­ like batteries ­ a certain lifetime. From the first time that a sensor contacts oxygen it starts to discharge. Its` lifetime is approx. 1 year. The user can replace the sensors by himself. The actual remaining O2 sensors life can be checked (after the unit has been switched on) by bridging the contacts B and E . English · The remaining lifetime of an O2 sensor cannot be increased by disconnecting the sensor! On page 24 (maintenance and storing) you get information on how to store the Oxy2. Battery O2 sensors 13 Calibrating the O2 Sensors A new calibration is needed when: · The ,,CAL" segment on the display is visible. · New sensors have been installed. · At least one of the O2 sensors needs to be calibrated. · For other reasons see page 7 (Checking the Oxy2). If the Oxy2 case has been opened you have to then wait 5 minutes after closing the case before you start to recalibrate. This prevents the calibration being affected by the influence of light. Procedure 1. Disconnect the Oxy2 from any equipment. 2. Switch it on and put the turnable switch to the position ,,CAL" (calibration). The display shows the flashing ,,CAL" symbol. It will remain visible until the turnable switch is turned back to ,,RUN". 3. If you want to calibrate with pure oxygen, you have to confirm that by bridging BE . Cal. Run · Using pure oxygen or oxygen enriched gas needs special safety measures! · If a calibration is performed with pure oxygen, no air should enter the space between the exit of the oxygen tank and the entrance of the Oxy2. 14 If you want to calibrate with air (20.9% O2), switch with B-S confirm by bridging B-E . to 20.9% and After the Oxy2 has passed the self test, the program starts with the automatic calibration procedure. The duration is between a few seconds up to approx. a minute. If the calibration was not completely successful the old calibration settings will still be valid and the display shows "­ ­ ­". In this case try to recalibrate again: turn the switch to ,,RUN" and back to ,,CAL". If the calibration is still not successfully completed the reason could be an unstable reference gas. Or if the display also shows the sensor symbol the O2 sensors could be exhausted and need replacing. After a successful calibration the Oxy2 indicates the ambient air pressure. This value has to be checked according to the following description: The absolute ambient air pressure relates to the actual altitude and the weather. It can only be measured by a barometer which is able to display the absolute air pressure. Barometers which only display the air pressure reduced to the equivalent sea level (normal) cannot be used. If you have no barometer on hand you can read out from the altitude reference curve the theoretical ambient pressure. If the displayed air pressure of the Oxy2 stays outside of a range of ±40 mbar (±0.58 psi) from the measured or readout value, the unit has to be checked by an authorised retailer. 15 English 4. After having confirmed your choice (100% or 20.9% O2), the Oxy2 starts a self test. If the program finds an important defect the Oxy2 displays "Err" which means that the Oxy2 has gone into a special error mode which cannot be fixed by the user. Only an authorised retailer or the manufacturer is able to repair it. Altitude over sea level (feet) 0 1100 Ambient pressure (mbar) 1000 900 800 700 600 500 400 0 1000 2000 3000 4000 Altitude over sea level (m) The indicated pressure of the Oxy2 has to be within ±40mbar (±0.58 psi) of the curve 3280 6560 9840 13120 15.95 14.50 13.05 11.60 10.15 8.70 7.25 5.80 Ambient pressure (psi) · Do not calibrate the Oxy2 above 4000 m (13120 feet). Cal. 5. Switch the turnable switch back to ,,RUN". Run · Make sure that you switch back to ,,RUN" otherwise the unit does not turn off automatically and the battery will be quickly used up! 16 Replacing the O2 Sensors In the following situations the O2 sensors have to be replaced: · The sensor symbol is visible on the Oxy2 display. · If a reliable measurement is not possible anymore, the sensor symbol and ,,CAL" will be displayed. Try a calibration. If this is not successful, the O2 sensors have to be replaced. · If the sensor capacity reaches 0%. English · If a sensor replacement is required, always replace both sensors! Procedure: 1. Disconnect the Oxy2 from any equipment. 2. Dry it with a soft towel. 3. Make sure that the turnable switch stays in position ,,RUN". 4. Use a 2.5mm Allen key to unscrew (anticlockwise) the 4 case screws. Carefully separate the 2 parts. · Open the Oxy2 only in a dry and clean place! It prevents soiling and damage to the electronics and O rings. 17 · Only open the unit if a battery or sensor replacement is necessary! · Do not touch either by hand or with any other object the electronics on the PCB board! 5. Remove carefully the large O ring and carefully dry the O ring recess. 6. Pull carefully the plugs out of the socket ( the tab, which stops the plug from falling out of the socket, has to be pulled back while pulling out the plug) · Do not pull on the wires! If the unit is running with an O2 sensor disconnected then, after a few seconds, the display shows "no". The unit switches off automatically after 10 minutes. 7. Screw the O2 sensors out (anti clockwise) 8. Take the new O2 sensors out of their packaging and clean the sealing areas of the O rings. If necessary clean the O rings too. Screw the sensors into the case. Tighten the sensors so that they cannot loosen by themselves. 18 · Do not open the sealed packaging before you need to use them for a replacement! See remark page 13. 9. Connect the plugs with the sockets of the O2 sensors. 10. Check the O ring of the case (little cuts ...) and replace it if necessary. 11. Clean the O ring and the sealing area of the case. 12. Fit the O ring carefully into the case. 13. Carefully refit together the 2 parts of the case. Make sure that no wire gets trapped and damaged by the case. Carefully and evenly tighten the 4 screws (for example first the upper left, second the lower right, then the remaining two screws). 19 English · After opening the sealed package the O2 sensors need 10 minutes start-up time. This means that calibration cannot be made until 10 minutes after opening the package. 14. After connecting the sensors or after the next switching on, the Oxy2 asks you: Are the fitted O2 sensors the same as you already used before disconnection (old) or have they been replaced (rep)? ,,OLD" means that after a confirmation (bridging B-E ) the lifetime calculation of the O2 sensors continues where it was before disconnection. ,,OLD" has to be selected if the sensors have not been replaced. If you replaced the sensors, you have to switch by bridging B-S to ,,REP". ,,REP" means, that ­ after a confirmation (B-E ) ­ the lifetime will be reset to 100% and the unit requires automatically a calibration. See page 14 ,,Calibrating the O2 sensors". · ,,REP" may only be chosen after a replacement of the O2 sensors by new ones! 15. Check the Oxy2. See page 7 ,,Checking the Oxy2". · Wait after you have opened the sealed packaging of the O2 sensors for 10 minutes before you start with a calibration! See page 19. 20