Dive Computer Expert Reviews
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Tusa Zen Air IQ–950 is high-tech instrument and can be recommended dive computer for advanced and technical divers, but may be considered as a first dive instrument by those newbies who want to progress in diving career fast and want to buy dive computer that has all-in-one features.
Zen Air is a further development of IQ–900 Zen dive computer from Tusa. Naturally IQ–950 gains some key features from its predecessor and at the same time it receives several complete brand-new functions of its own.
Main differences are: hoseless air-integration and possibility to pair up to 3 transmitters, included PC cable interface into the package, few new types of alarms and display layout, regarding to air-integration.
In July 2010 Tusa made an upgrade to IQ–950 Zen Air to improve performance, so you may check out Tusa web-page to download this thing.
Copy this Tusa ZEN Air IQ-950 Key Features & Alarms Card for your Reference and Share with your friends and buddies!
Above mentioned alarms are for Air and Nitrox dive modes, Freedive mode has its own alarms and we will discuss them later below.
Tusa Zen Air IQ–950 inherited from its predecessor 4 control buttons: Mode, Advance, Select, Light. Certain button combinations will allow us to step back to the menu hierarchy – that’s a great timesaving benefit for us!
Display has almost the same layout except extra new values regarding to air-integration, like Air Time, cylinder pressure, wireless transmitter icons.
Tusa Zen Air IQ-950 has 3 bar graphs that are similar to IQ-900 model – Nitrogen Loading Bar Graph (NiBG), Oxygen Bar Graph (O2BG), and Ascent Rate Bar Graph (ASC). That’s all pretty intuitive and obvious:
Display has main and alternative screens, so you need to press ADVANCE button to move between them to view additional dive data.
This is a setting time and we are going to adjust our Tusa Zen Air IQ-950. All parameters are divided to certain groups similar to IQ-900 model. Diver is able to set fully functional digital watch, number of parameters for dive modes, alarms, and utilities.
Copy this Tusa ZEN Air IQ-950 Fine-Tuning Card for your Reference and Share with your friends and buddies!
Also Tusa Zen Air IQ-950 has Dive Planner that calculates and shows our No-Decompression times for certain depths according to nitrogen and oxygen loading from previous dives (if any). This function works only for Gas Mix 1. Even if you enabled two other mixes – it will not make any effect on calculations.
We set Wet Activation to ON and when dive computer senses depth of 1.5 meters it will activate dive mode.
Tusa ZEN Air IQ-950: Diving With Air & Nitrox
Below is a summary of dive data regarding to No-Decompression conditions and diving with Nitrox from main and alternative displays:
As we set Deep and Safety stops to ON before, Tusa ZEN Air IQ-950 may give as prompts upon reaching certain conditions. Stop depth and time will be displayed to help you manage those situations safely.
Safety Stop prompt used to show depth of 4.5 meters before, but now with new upgrade from Tusa Safety Stop depth will be 5 meters.
Tusa Zen Air IQ-950 allows us to swap gas mixes during a single dive if we enable them, of course. It has the same feature as Tusa Zen IQ–900 has: if there is not enough gas in your cylinder to finish a dive and you switch to gas mix with prohibited PO2 – you will be allowed to do this.
The most convenient functions of Tusa Zen Air IQ-950 is hoseless air-integration and possibility to observe Air Time Remaining according to our air consumption, Cylinder pressure, and set of alarms – Air Time Remaining alarm, Turn Pressure alarm and End Pressure alarm.
If you dove with air-integrated dive computers before – you may know how Air Time Remaining alarm works, but if not – here is a brief explanation.
If we take Suunto air-integrated models for an example – they have preset Low pressure alarm for 35 bar. And when calculated Air Time Remaining becomes ‘zero’ and alarm goes on – it means that there is still enough pressure for you to reach surface safely and that pressure is 35 bar.
The same happening here, but in this air-integrated dive computer you may set your own desired pressure and this is End Pressure alarm set point. See, logical and easy and we are safe!
If we exceed our No-Decompression Limits (NDLs), Tusa Zen Air IQ-950 activates Decompression mode. You will hear an audio and applicable dive data will be displayed when decompression mode activated. From this moment all calculations will be made regarding to Deco mode.
Below is a summary of information displayed in regards to Decompression mode:
Tusa ZEN Air IQ-950: Diving In GAUGE Mode
Next Dive mode of Tusa Zen Air IQ-950 is Gauge. Zen Air doesn’t perform any calculations of nitrogen and oxygen loading during this dive mode. It can be used as a depth gauge and depth timer only and in addition it will show us cylinder pressure, Air Time Remaining (ATR), and we may swap gas mixes as well.
Display shows dive data similar to listed below and it is a summary from main and alternative displays:
Tusa ZEN Air IQ-950: FREEdiving
FREEdive mode is similar to Tusa Zen IQ–900 and it has similar set of alarms and functions. Before freediving with Zen Air we may set following alarms:
During freediving Tusa Zen Air IQ-950 displays following dive data:
Upon reaching certain conditions dive computer will give you alarms that were set before, including NiBG alarm.
Nitrogen loading is calculated between this freedive and previous dives. So, if you have residual nitrogen and its level will reach Cautious zone – dive computer will warn you about that, and there is more – if Nitrogen level increases to Decompression level – dive computer will activate Violation Gauge Mode (VGM) for 24 hours and you need to stay on surface without any diving activity for entire period of 24 hours.
Post diving functions of Tusa Zen Air IQ-950 are similar to Tusa Zen IQ–900 and I gave brief descriptions of them below:
For Freedive History and Logs we need to use PC interface cable and Tusa Dive Manager Software to transfer freedive data to computer for viewing and organizing.
Tusa ZEN Air IQ–950: What Divers Say
I may say that Tusa produced its first air-integrated dive computer and it is nice addition to our market. This scuba dive gear has its own personality and we didn’t find any problems with it. Wireless was always steady and functions related to it worked well!
You may consider Tusa Zen Air IQ-950 as primary dive computer whether you are beginner, who is not afraid to start with high-tech stuff, or technical diver. This dive computer suits well both and you won’t get wrong with it!