PREDATOR SUPPORT

Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.

Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.

Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.

The warranty covers included accessories such as chargers and straps.

Do I need to register my computer for warranty?

No. The warranty is linked to the computer’s unique serial number.

Who do I contact if my computer needs a repair?

You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/

You may also contact your closest authorized service centre directly using the contact details at the bottom of the page.

Please do not return any products without first obtaining an RMA from the relevant service centre.

How much will my out-of-warranty repair cost?

A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.

How long will the repair take?

Shearwater and its authorized service centres aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.

Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.

Please contact the relevant service centre for a more accurate timeframe.

What is Shearwater’s service shipping policy?

You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.

How often should I have my computer serviced?

Shearwater recommends a general service of your dive computer every 2 years by an authorized service centre.

Does the warranty cover the rechargeable battery in my Teric/Peregrine?

It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.

If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.

Battery Leaks

Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.

DEMO & PRO Computers

Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.

Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.

These guidelines apply to standard Shearwater products only and any governmental products, including military, commercial, and public safety, may be subject to their own warranty conditions – please consult your representative for further information.

Need a repair? Find your nearest service centre here.

What type of batteries can I use in the Predator?

The recommended battery is the 3.6V Saft LS14500 battery.

Other 3.6V Lithium Thionyl-Chloride batteries are possible, but may not provide adequate performance. Many batteries of this type cannot provide enough current to run the Predator. Batteries should be rated to provide a continuous output current of at least 50mA. For example, the Saft LS14500C (note the “C”) does NOT work because it is only rated to 25mA continuous.

How should I change the batteries on the Predator?

Instructions on how to change the batteries on the Predator can be found here: Predator Battery Kit Installation

How long should the battery last?

A Saft LS14500 battery should provide 90 hours of diving (on medium brightness) in addition to 1 year of standby time.

Higher screen brightness will drain the battery faster. On high brightness, about 60 hours of diving can be expected. The “Auto” brightness setting measures the ambient light to adjust the brightness for the best balance of battery life to screen readability.

If you aren’t getting the expected battery life, see the next item.

I am getting a lot of low internal battery warnings, even with new batteries. What is wrong?

You should be getting 60 to 100 hours of battery life on a Saft LS14500 battery.
Lower battery life could be caused by a few reasons:

Wrong battery type. The recommended battery type is the Saft 3.6V LS14500. Other Lithium Thionyl Chloride batteries may not provide enough current for proper operation.
Poor contact in the battery holder. Some holders do not squeeze the battery tight enough. These low battery warning often occur during the dive. A small kit is available free of charge to fix this problem. Please contact Shearwater (info@shearwater.com) if you think you are having this problem.
Battery passivation. This is an insulating layer that grows on the lithium anode during periods of storage, especially at high temperatures. The insulating layer burns off once the Predator is turned on, but the voltage drops during this time. If you see a single low internal battery warning after installing a new battery or after a period of storage, then this may be the cause.
Other damage. It is possible your Predator is damaged and may need repairs. Contact us for support.

What kind of O2 Sensors can I use?

The Predator expects galvanic O2 sensors of the 10mV in air type. It assumes the sensors have linear response to PPO2 and have internal temperature compensation.

I am having problems calibrating. What can I do?

Always follow the instructions provided by the rebreather manufacturer and training agency when O2 sensors.
Cable and connector problems are also a common cause of failed calibrations.
Failed or dying O2 sensors may fail to calibrate properly. Follow the replacement schedule as specified by the sensor manufacturer, the rebreather manufacturer and your training agency. Also, be aware that galvanic O2 sensors can be easily damaged by shock (e.g. when dropped).
The Predator expects the mV output of the cells to be within 30mV to 70mV in 100% O2 at 1 atmosphere. These mV limits are scaled automatically with pressure changes and the Cal FO2 setting. If the measured mV is outside of the limits, that sensors will fail to calibrate.

I am getting strange or intermittent PPO2 readings. What should I do?

Cables and connectors are the most common points of failure. Inspect cables and connectors carefully. Try to isolate problems. For example, trying a new cable may help.

Failures of the O2 sensor cells themselves are also common . Paul Raymaekers of rEvo Rebreathers has written an excellent article on Understanding Oxygen Sensors used in rebreathers.

What is the pin-out of the Fischer connector?

Fischer Connector: Looking into the socket on the Predator

How do I maintain the Fischer connector?

Have a look at our Fischer maintenance guide.

Is PPO2 displayed in absolute atmospheres or Bar?

The Predator displays PPO2 in absolute atmospheres (ata).

1 ata = 1013 millibar = 1.013 Bar

The difference between Bar and ata is only 1.3%, so for practical purposes the displayed PPO2 values can be considered either ata or Bar.

I calibrated with the Fraction of O2 (FO2) set to 98%, but after calibration the PPO2 reads differently (for example, 0.96). Why?

The Predator automatically adjusts the calibrated PPO2 to adjust for variations in current barometric pressure (due to altitude or weather). PPO2 is dependant upon ambient pressure, so the calibrated PPO2 will not always match the Fraction of O2 in the calibration gas.

For example, say we are at sea level (normally 1 atmosphere or 1013 millibars), but a low pressure weather system has the barometric pressure reading 990 millibars. If we calibrate with an FO2 of 98%, then the expected PPO2 is (990/1013) x 0.98 = 0.96. So after calibrating, all three sensors in this case would read 0.96 (not 0.98).

This is the correct way to calibrate PPO2. However, if this difference drives you crazy or you want to match another dive computer that does not adjust for barometric pressure, then set the "Display Setup->Altitude" setting to "SeaLvl". This will assume that surface pressure is always 1013 millibars, and your calibrated PPO2 will match the FO2. Note however, that this is actually an incorrect calibration and you are introducing error into your PPO2 measurements by doing this. DO NOT use the "SeaLvl" setting when diving at altitude. That is, when diving at altitude above sea level, set the Altitude setting to Auto.

How often should I calibrate my O2 sensors?

You should follow your training agency and rebreather manufacturer guidelines regarding calibrations.

In the absence of these, we can offer what we believe to be best practices:

Always calibrate when a new sensor is installed.
Calibrating every dive is unnecessary and can actually mask the decline of dying cells.
Better than frequent calibration is infrequent calibration (perhaps quarterly), but coupled with frequent verification of calibration accuracy.
Calibration accuracy should be verified for every dive.
Verification of accuracy should be done at multiple points, ideally with one point above a PPO2 of 1.0.
For example, verify that the sensors read close to 0.21 in air (at sea level, adjust expected value if at altitude). A pre-dive flush of O2 should show the sensors come close to 1.0. Verifiying above 1.0 can be done by stopping to flush with O2 at 6m during the descent. Alternatively, small pressure chambers are available for testing cells up to a PPO2 of 1.6 on the surface.

The reason verification should be performed above a PPO2 of 1.0 is that O2 sensor current limiting is a common failure mode of these sensors as they age. Current limiting can cause a sensor to behave linearly below a PPO2 of 1.0, but then taper off quickly above 1.0.

Also, CCR divers should always use at least 2 independent PPO2 displays. Calibrations should not be done on both displays at the same time (unless new sensors are being installed, in which case both must be calibrated). When performing the calibration, there is a risk of making a mistake, resulting in an inaccurate calibration. If you perform both calibrations at the same time, both will be wrong and with this error potentially undetectable. If calibrations are done on different days, you still may not know which is correct, but at least you will notice the difference, allowing you to call the dive or bail out to open circuit (Of course if you had verified the accuracy of the calibration, you wouldn’t have gotten into such a situation).

Why don't you use two-point PPO2 calibration?

We do not believe two-point calibration offers any benefit and has some distinct drawbacks over a one-point calibration.

Two-point calibrations are more complex and time consuming, resulting a higher chance for mistakes.
Two-point calibrations can mask some types of cell faults.

We believe the best approach is a one-point calibration WITH frequent verification of calibration accuracy.

Frequent verification of calibration accuracy is critical. Verification should be done at a minimum of two known points, ideally with one point above a PPO2 of 1.0. Achieving a PPO2 above 1.0 can be done by flushing with O2 at 6m during the descent or by using small pressure chambers that are available for this specific purpose.

The GF99 value shows the current leading tissue inert gas super-saturation percent gradient as defined by the Bühlmann ZHL-16C decompression model. If that sounds confusing, then recommended reading is Erik Baker’s paper, “Clearing Up Confusing About Deep Stops”.

This value can be used as a rough measure of the current decompression risk. A value of 100% (Bühlmann’s originally allowed super-saturation limit) is now generally accepted to be too risky. The GF low and high conservatism settings are used to scale Bühlmann’s original limits to reduce risk of decompression sickness. The default GF low value of 30% limits the super-saturation gradient at the deepest stop. The default GF high value of 80% sets the surfacing limit. Between the deepest stop and the surface the GF limit is linearly interpolated.

The GF99 value shows the current super-saturation as a percentage of Bühlmann’s original limits. If no super-saturation exists, then the GF99 displays “On Gas”. Once a super-saturation exists, the GF99 is displayed in green. It switches to yellow when the GF99 exceeds the value defined by the GF conservatism settings. Above 100% it is displayed in flashing red.

In extreme conditions, decompression risk can be traded for operational risk by using the GF99 display. For example, in a low-gas situation or perhaps a bailout or injury, you may want to get to the surface faster, but not blow off all the remaining decompression stops. You could then violate the stop displayed by the Predator, and decide to follow a more aggressive GF99, say 95%. This will get you out of the water faster, at a higher risk of decompression sickness, while still remaining within some limits. Upon resurfacing, appropriate action for omitted decompression should be followed such as rest, surface O2, monitoring symptoms and contacting DAN or other diving medicine center.

Conversely, the GF99 value can also be used to add conservatism. For example, if you knew that you had been exposed to factors that increase decompression sickness risk such as exercising during the bottom time or being colder on deco than the bottom, then you could use this value to extend shallow stops. Of course, you could always just add a few minutes to your last stop, but this gives a quantitative measure to correlate with “how you feel” after the dive.