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Rear view with back cover removed showing:
Counterlung, canister head, Rear HUD, Canister Tube, Canister Base, Diluent cylinder, Oxygen cylinder,Over Pressure valve
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| Side view showing case, rear facing hud, breathing hoses and oxygen cylinder |
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Sentinel FAQs
Q: How much does the Sentinel weigh?
A: 31 kg in shipping crate without cylinders. It can be separated into several pieces for easy transport if required.
Q: Is the Sentinel CE approved?
A: It has been certified to the PPE Directive 89/6866/EEC Article 10 which included meeting the requirements of EN14143: 2003 except for some minor exceptions which are listed in the operations manual. The quality management system for the manufacturing process is certified to ISO 9001:2000 and Article 11b of the PPE Directive.
Q: How long will the scrubber last?
A: 185 minutes at CE testing rates in 40 metres of water on an air diluent and 150 minutes at CE testing rates in 100 metres of water on a heliox diluent. It is the most efficient per kg of any commercially available rebreather currently on the market.
Q: How much absorbent does the Sentinel hold?
A: 2.2kg of 797 grade 1 to 2.5 mm sofnolime granules.
Q: Does the Sentinel have a CO2 detector?
A: No, but the Expedition version does have a CO2 sensor. You can now upgrade from a Standard Sentinel to an Expedition version with CO2 sensor. Please contact our ssales team for pricing. sales@technologyindepth.com. The Sentinel Expedition does have a .
Q: How much does the Sentinel cost?
A: Please see our on-line store for pricing.
Q: What cylinder size can I use on the Sentinel?
A: Level 1 units use a 2-litre O2 cylinder and a 3 -litre 300 bar diluent cylinder. Level 2 and 3 units come standard with 2-litre cylinders. All cylinders have AP type pillar valves. There is an option to fit offboard gas whips to the Sentinel this will allow larger cylinders with different mixes to be used on the unit.
Q: What types of O2 sensors are fitted to the Sentinel?
A: Teledyne R17D sensors. Our part number is #106. These can be purchased on-line at our shop.
Q: What BC or backplate can I use with the Sentinel?
A: The Sentinel has its own specially designed backplate and wing. The harness on the backplate is webbing and can be adjusted by the user.
Q: Is the Sentinel easy to set up?
A: Yes, oxygen cell calibration is automatic. No tools are required for daily maintenance / setup.
The counterlung is easily removed for cleaning. The complete pre dive checklist is available on the main display.
Q: How do I purchase a Sentinel?
A: The Sentinel can be purchased through one of our dealers http://www.technologyindepth.com/sentineldealers.html Training is then provided by one of our approved instructors. Go to our shop for more purchasing information.
Q: Does the Sentinel have a bailout valve?
A: Yes it has a bailout valve fitted to the bottom of the mouthpiece; this is connected into the onboard diluent cylinder.
Q: How many displays does the Sentinel have?
A: The Sentinel has a primary colour display and a separate backup PO2 display along with a HUD and rear mounted buddy HUD.
Q: What type of batteries does the Sentinel use?
A: The Sentinel uses lithium polymer rechargeable batteries with a 60-hour life and a 6-hour recharge time. The Sentinel can also be recharged with our optional solar charger.
Q: Can the user upgrade the Sentinel software?
A: Yes this can be uploaded through our Prolink software and from updates on the website. Options for alternate decompression algorithms and downloading can be purchased and entered by the user via our PIN system.
Q: How can I receive training on the Sentinel?
A: Training is available through our dealers / instructors, also please check with your recognised training agency for a list of approved instructors. http://www.technologyindepth.com/sentineldealers.html
Q. My sentinel will hold a negative when the ADV slider is shut but not when the slider is open.
A. Possibly the servo in the Poseidon first stage is leaking gas when in negative pressure, if a in-line BOV shut off is fitted close it and try the negative test.
If a in line BOV is not fitted then remove the BOV hose and block with thumb, then try test again. If the negative test passes then a slightly leaking Poseidon servo valve is at fault.
Due to the design of the Sentinel this issue will not effect the safe operation of the rebreather, but you may consider either fitting a in-line BOV shutoff or replacing the servo on the Poseidon.
If a in-line BOV shut off is fitted once the negative test is completed remember to open it.
Product Manual Updates
Updates for the Expedition Sentinel are;
1. Heading: External Gas Supply Connection Kit
Function: To add an external gas supply to the rebreather either to increase duration or change gases while submerged.
Components Supplied: A pair of Low Pressure (15 bar working pressure) in-line quick release gas connectors with associated low pressure (LP) hoses. The female part is stand-alone and the male part comes already attached to the LP hose.
Fitting Location: These are fitted to the Oxygen and Diluent Gas blocks (female part) and the 1st stage(s) of external gas SCUBA regulator(s) carried by the diver (male part and LP hose).
Assembly Instructions: Remove the 3/8 UNF LP blank port from the relevant first stage. Screw in the LP hose supplied (with the O ring attached). Tighten the fitting sufficiently in-line with the SCUBA manufacturers instructions.
Remove the blank port at the base of each gas block. Fit the sealing washer supplied in the kit to each female connector. Screw the connector into the gas block. Fit with minimal torque so as not to damage the plastic threads.
Testing, Gas Blocks: Apply gas to the rebreather by connecting the cylinders and pressurising the LP lines. Immerse the gas blocks in water and look for leaks. Clean and reset the connections as required.
Testing, SCUBA regulator LP fitting: Apply gas to the regulator and immerse the whole first stage and hose and LP fitting. Check for leaks. Clean and reset the connections as required.
Warnings: Do not use with a regulator inter-stage pressure of more than 11 bar. Always keep the connections clean and free from salt/debris build up. Regularly test the connections/hoses. Only use oxygen in the oxygen side connection system. If other gases are used, contaminants may be introduced and oxygen cleaning may be required and should be carried out by a recognised service technician.
2. Heading: Protective Hose Covers
Function: To add additional abrasion protection to the breathing hoses.
Components Supplied: A pair of material hose covers, already fitted to the breathing hoses.
Fitting Location: Already fitted to the breathing hoses.
Assembly Instructions: Not required. To remove the covers, simply slide them off.
Testing: No testing required.
Warnings: Remove the covers on a regular basis and clean out any debris that may collect under them to reduce hose damage. Replace if they become damaged.
3. Heading: BOV Emergency Shut-off Valve
Function: To add an emergency shut-off valve to the BOV LP feed to prevent regulator free-flow.
Components Supplied: An already fitted, in-line shut-off valve.
Fitting Location: The valve is fitted at the end of the LP hose to the Bailout Valve (BOV) LP hose and screws into the 2nd stage of the BOV.
Assembly Instructions: It comes fitted. To remove use a suitable spanner, unscrew the LP hose and then unscrew the valve from the second stage.
Testing: Apply gas to the rebreather by connecting the cylinders and pressurising the LP lines. Immerse the second stage/in-line shut off in water and look for leaks. Clean and reset the connections as required. Now breathe the regulator whilst operating the shut-off by sliding it to the right and left. Make sure that the gas supply is stopped and then starts again as the valve is operated.
Warnings: Servicing should be carried out by a recognised service technician. Do not start the dive with the shut-off closed and then open it underwater. This action may damage components of the second stage regulator. Keep the shut-off open at all times until needed in an emergency.
4. Heading: Heavy Duty Backplate
Function: To add additional weight to the unit when diving with drysuits/thick underwear or in addition to a weight-belt/trim weights.
Components Supplied: An already fitted stainless steel back-plate.
Fitting Location: This comes fitted to the harness.
Assembly Instructions: The plate is fitted to the rebreather via two 8mm screws that pass through the plate and locate into the rebreather spine. To remove simply unscrew these two screws.
Testing: Always make sure you are properly weighted by carrying out a weighting/buoyancy check as discussed in the Operations manual and carried out on your course.
Warnings: See Weight/buoyancy Checking in the Operations manual.
5. Heading: Secondary (Backup) PO2 Display
Function: To replace the existing secondary PO2 display on the unit. This new unit removes the need for the three calibration potentiometers currently in use on the rebreather canister head which calibrate the secondary display. Operation (displaying the PO2 etc.) is as per the old display and instructions are in the operations manual See document later in the Appendices).
Components Supplied: An already fitted backup PO2 display.
Fitting Location: Already fitted on the end of the secondary display cable.
Assembly Instructions: Not required. Already assembled.
Testing: Ensure the secondary display is kept charged by regularly charging the rebreather as required, this will charge the independent battery in the secondary display as well.
To check calibration of the unit; make sure pure air only is within the rebreather, for details see the iSec Operations Manual.
Warnings: The secondary display should be calibrated to within =/- 0.1 PO2. Ensure the battery is charged before diving.
6. Heading: Electronics cap for item 5 and 7.
Function: To allow a gaseous CO2 sensor to be added to the unit and to remove the three secondary PO2 display calibration potentiometers.
Components Supplied: The unit will come already fitted with a new electronics cap. An addition cable will exit the cap with a marine connector attached. This is able to interface to the CO2 sensing module when fitted.
Fitting Location: In the canister head. Already fitted.
Assembly Instructions: Already fitted. To connect to the CO2 sensing module, simply remove the protective cap on the cable and the one on the CO2 sensing module and plug the connectors together.
Testing: Secondary display PO2 calibration is covered under bulletin 5 (Secondary Display). CO2 calibration is covered in the iSec Operations Manual.
Warnings: Always keep the connector protective caps is in place when the connector is not mated to the CO2 sensing module.
7. Heading: CO2 sensor module/port/blanking cap
Function: To facilitate the addition of a CO2 sensing module. This feature comes in 3 variants.
a. For new units, an integral unit that fits into the canister head. The rebreather then takes data from the sensor via the cable mentioned in bulletin 6 (electronics cap) and displays it on the primary display of the rebreather.
b. For existing users, either the option to upgrade to the unit above with a new canister head and electronics cap or connect a standalone gas sensing module into the inhale breathing hose (as a gas source) and then have fitted (factory) a new electronics cap as in bulletin 6. The rebreather then takes data from the sensor via the cable mentioned in bulletin 6 (electronics cap) and display it on the primary display of the rebreather.
c. For existing or other rebreather users, to use the above option of a standalone gas sensing module but connected to a VR Dive computer (not linked to the rebreather). This will be available Winter 09.
Components Supplied: A blanking cover (O ring sealed) to take the CO2 sensing module when it is launched and the new electronics cap dependant on variant a,b,c above. The CO2 sensing module and inhale hose connection kit.
Fitting Location:
Variant (a) The module or blanking port can be fitted into the canister head, secured by 4 screws and a sealing O ring.
Variant (b) A standalone gas sensing module. Connected to the inhale breathing hose fitting. An electrical connector attaches it to the rebreather electronics.
Variant (c) A standalone gas sensing module. Connected to the inhale breathing hose fitting. An electrical connector attaches it to the VR computer electronics.
Assembly Instructions:
Variant (a) The module or blanking port will be fitted into the canister head, secured by 2 screws and a sealing O ring. Ensure the water-sealing body O ring is in place and lightly greased before fitting.
Variant (b) Connected to the inhale breathing hose fitting.. An electrical connector attaches it to the rebreather electronics.
Variant (c) Connected to the inhale breathing hose fitting. An electrical connector attaches it to the VR computer electronics.
Testing, CO2 Sensing module: Testing and set-up of the CO2 sensing module will be covered under the CO2x operations manual.
Whether the blank port or the CO2 sensing module are fitted or not, then leak tests should be conducted prior to every use as per the Sentinel operations manual ‘Pre-dive set-up’ section.
Warnings: Do not dive the rebreather without the CO2 sensing module or the blank port fitted.
electronics for underwater adventure
electronics for your underwater adventure
