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Catalogue

Tusa IQ-750 Element II: Dive Technical and Go Deeper

Tusa IQ-750 Element II: Dive Technical and Go Deeper

Tusa IQ-750 Element II is well suited as for beginners and advanced divers who want to stretch their diving activities to deeper depths with 2 Nitrox mixes and get flexibility of using this dive computer for freediving.

General Information
Specifications
User Interface
Pre-Diving
Diving
Post-Diving
Summary
Your Review

 


 

Tusa IQ–750 Element II was made as a further advancement and ‘step up’ dive computer from previous model IQ-650. It gained many brand-new features and doesn’t resemble its predecessor at all. IQ–750 has dual gas and switching gases functions, audio alarms, backlight and PC download options, air and nitrox, freedive and gauge dive modes.

This instrument is recommended dive computer as for beginners and advanced divers who want to stretch their diving activities to deeper depths and get flexibility of using this dive equipment in different dive modes.

As in the case with Tusa IQ–650, we may create 2 consoles with Tusa IQ–750 dive computer. The first one is SCA–252 with IQ–750 and pressure gauge, the second is SCA–352 with dive computer, pressure gauge and compass.

 

SCA-252 Console
SCA-252 Console: IQ-750 and Pressure Gauge
SCA-352 Console
SCA-352 Console: IQ-750, Pressure Gauge and Compass

 

 Tusa Element II IQ-750 SCA-352 console

Copy this Tusa IQ-750 Element 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.

 

benefits-diver
  • you will get dive computer that has 4 dive modes to address diving with Air, Nitrox, Gauge and freediving;
  • you will have instrument that helps you starting technical diving;
  • you will be able to build double console with SPG or triple NAVCON console by adding compass ;
  • you will get dive computer that is highly customizable, despite on its simplicity;
  • you will be able to replace depleted battery yourself and keep settings intact with data retention function;
  • you can easily save some money for your other dive gear buying Tusa Element II IQ-750 dive computer

 

 


 

 


 

 


 

User Interface
3 buttons
Dive Modes
Air, Nitrox, Gauge, FREEdive
Integrated Digital Compass
n/a
Algorithm
Buhlmann ZHL – 16C
Number of Gas Mixes
2
FO2
Mix 1: Air, 21% - 50%; Mix 2: Air, 21% - 100%
PO2
1.2 - 1.6 ATA
Air Integration
n/a
Safety Stop (SS)
ON/OFF
Deep Stop (DS)
ON/OFF
Conservative Factor
ON/OFF
Altitude adjustment
automatic
Gas Switching
yes
Dive Planner
9 - 57 meters
Logbook Capacity
24 most recent dives
Max Operational Depth
120 meters
Backlight duration
0/5/10 sec
Sampling Rate
2/15/30/60 sec
User Replaceable Battery
yes
Data Retention
yes
PC Interface
optional
Warranty
2 years

 

diver

 

 


 

 


 

 


 

As I said above Tusa IQ–750 Element II has 3 control buttons: MODE, ADVANCE, and SELECT. Using them we will manage our diving and adjust all parameters. Front buttons are big and easy to press regardless of what thickness gloves we wear, side button may be harder to press with thick gloves.

But before you need to devote some time to learn how to use those buttons. It may be confusing for the first and maybe even second time.

Tusa IQ–750 has 3 bar graphs to represent some dive data graphically. Below you may see short descriptions for each of them:

  1. Nitrogen Loading Bar Graph (NiBG) – represents our nitrogen absorption and has 3 zones – No-Decompression zone, Caution (No-Decompression), and Decompression zone;
  2. Oxygen Bar Graph (O2BG) – shows us oxygen toxicity level and oxygen accumulation for the last 24 hours or last dive;
  3. Ascent Rate Indicator – graphical representation of our ascent speed

 

It is worth to mention that display for each dive mode has main and alternative screens with additional dive data and if you need – it easy to swap displays just by pressing Advance button.

Backlight is strong enough and all digits are big to see them clearly underwater, so you won’t have any troubles with it.

Front control buttons are big and easy to press, but you may find difficulties to press side button if you dive in cold waters and wear thick gloves.

 


 

 


 

 


 

During pre-diving, usually we set and check parameters and I may tell that Tusa IQ-750 has many of them to satisfy demands the most capricious diver!

All parameters are divided into 4 groups – setting FO2s, setting Alarms, Utilities and Time.

 

Tusa Element II IQ-750 Fine-Tuning Card

Copy this Tusa Element II IQ-750 Fine-Tuning Card for your Reference and Share with your friends and buddies!

 


 

 


 

 


 

Tusa IQ-750 Element II: Diving With Air & Nitrox

Tusa Element II IQ-750 NO-DECO Card

Copy this Tusa Element II IQ-750 No-Decompression Displays Card for your Reference and Share with your friends and buddies!

 

If you we set it for Air – dive computer, obviously, won’t display values related to Nitrox and O2BG may not be displayed as well, but everything else is similar.

Tusa IQ-750 scuba dive computer displays No-Decompression (NDC) Dive Time Remaining by monitoring your current depth, oxygen accumulation, no-decompression status. It shows you not only your Dive Time Remaining (DTR) at certain depth in minutes, but also displays status of NiBG or O2BG (in Nitrox mode) by adding or taking away segments of those graphs.

When we dive with compressed air – we have 79% of nitrogen and 21% of oxygen approximately. If this is the case – our tissues absorb nitrogen and Dive Time Remaining (DTR) is shown according to nitrogen loading.

When we dive with Nitrox – it is a different case. We have different percentage of nitrogen and oxygen and our body responds differently to such a gas mix. In this case we are exposed to oxygen toxicity. If oxygen exposure reaches maximum allowed limit – Tusa IQ–750 will display O2 icon and Dive Time Remaining will be displayed regarding to O2 calculations.


Diving with Nitrox has its own peculiar properties!
First of all we need to set exact parameters for FO2 for one or both gases and PO2 alarm. After we did that, Tusa IQ–750 will calculate maximum operational depth (MOD) that can be reached according to FO2 and PO2 set. And if during a dive we exceed MOD – dive computer will give us an audio alarm with flashing PO2 icon and UP Arrow – it means that it is time to ascend!

If you set Deep and Safety Stops functions to ON, upon reaching certain conditions of dive, Tusa IQ–750 will give you corresponding stop prompts with all appropriate notations, icons and values, like: STOP icons, countdown timers, stop depths. This dive computer manages these stops and displays stop data similar to Oceanic dive computers.

In certain conditions dive computer gives High PO2 alarm (if ascended deeper than maximum operational depth according to FO2 and PO2 set) and High O2 alarm when maximum allowed level of oxygen toxicity was reached. And again, it has all appropriate notations, values and icons to assist us in these cases.


Almost missed to mention about Ascent Rate alarm – this thing will activate if you ascend faster than allowable maximum at certain depths. Tusa IQ–750 will flash with Ascent Rate Indicator full set of segments, notation SLOW and on top of that – audio goes on and on, until we slow down – it is pretty loud, so you won’t miss it!

As this dive computer has double nitrox gas feature – it has a function of switching gases during a single dive, of course. Just before doing this for the first time underwater – practice button combos on surface to be sure that you know what to press after what not to be confused later!

 

Tusa IQ–750 activates Decompression mode if we exceeded our No-Decompression Limits (NDLs) – depth and time. From this moment dive computer calculates all dive data according to this mode.

For managing Decompression Stops Tusa IQ-750 has comprehensive display:

  1. NiBG or O2BG;
  2. Total Ascent Time;
  3. Stop Depth and Time;
  4. Gas tank selected icon;
  5. current depth;
  6. applicable icons, etc.

 

During decompression we need to safely ascend to the deepest stop depth displayed and stay at that depth or slightly deeper until countdown reaches ‘zero’, then next shallower stop depth will be displayed and we have to proceed with the same process, and so on.

If any violations occurred during decompression procedure – Tusa IQ–750 will guide us very well through those conditions. It has special algorithm to calculate each violation whether you ascended shallower or found yourself much deeper (greater than 21 meters, for example).

 

Tusa IQ-750 Element II: Diving In GAUGE Mode

Next Dive mode that Tusa IQ–750 has – is Gauge mode. In this mode dive computer works as a depth gauge and timer and doesn’t perform calculations for No-Decompression times and depths.

Display layout has following attributes (main and secondary):

  1. current and maximum depth reached during a dive;
  2. temperature;
  3. time;
  4. Elapsed Dive Time (EDT);
  5. Ascent Rate Bar Graph (if ascending)

 

Tusa IQ-750 Element II: FREEdiving Mode

The last Dive mode of Tusa IQ–750 that we haven't mentioned yet, can be warmly welcomed by freediving guys, because it is dedicated Freedive mode.

If you are a freediver – you may be particularly interested in following functions for freediving:

  1. Countdown Timer (CDT);
  2. Freedive Elapsed Dive Time (EDT) alarm – it is factory preset for 30 seconds and you may set it ON/OFF, and if it is set to ON – it will give you beeps every 30 seconds;
  3. Freedive Depth alarms – 3 alarms that you may set each at progressively deeper depths (range 10 – 100 meters in 1 meter increments);
  4. NiBG alarm – dive computer calculates nitrogen loading from previous dives and displays its level on NiBG, if its level increasing – dive computer warns you by beeping and flashing segments

 

Back to Top

 


 

 


 

 


 

After Transition period (10 minutes after dive) Tusa IQ-750 allows us accessing following functions:

  1. PC download – can be done by using optional interface cable and special software that can be downloaded from Tusa website;
  2. Dive Plan mode – set the desirable parameters - Air or Nitrox, FO2 (only Gas mix 1) and PO2 and dive computer will calculate available No-Decompression times and depths according to your settings and nitrogen and oxygen accumulation from previous dives;
  3. No-Fly Time counter;
  4. Desaturation counter;
  5. Log mode for Air, Nitrox and Gauge (logs from Freedive can be downloaded to PC and viewed by using special software, but you can not view them on dive computer display);
  6. History mode for Air, Nitrox, and Gauge (Freedive history should be downloaded to PC for viewing)

 


 

 


 

 


 

Tusa IQ-750 Element II: What Divers Say

Positives

  • double nitrox gas mix;
  • console or wrist mounting options;
  • fair and very reasonable price;
  • user replaceable battery with data retention feature - no data will be lost when battery is replaced;
  • multimode dive computer, recommended dive computer for recreational diving

 

Negatives

  • not easy to learn buttons combos and sequences;
  • PC interface is overpriced and optional;
  • no Time and Depth adjustment for Safety and Deep stops...

 

Tusa IQ-750 Element II is well suited for beginners who want to progress fast in diving career, advanced recreational divers, and freedivers.

I couldn’t say that I found any major problems with it and guys I met who used this dive instrument didn’t blame it any way. The only things that come to my mind and worth to say about – side button not easy to press with thick gloves and to get the most out of this dive computer - you need to set some time to read manuals and learn how to use it properly – and that’s about it.

 

Tusa Element II IQ-750 dive computer
Tusa IQ-750 Element II

Dive-Computer-Wizard Rating
golden star golden star golden star golden star half star

 

I say it again that from the point of specs, features and price – Tusa IQ-750 Element II is perfect addition to your dive gear and you may use it as a primary instrument or as a backup.

 


 

Add comment
Hiroshi.A, 10 November 2013 09:16
Great SCA-352 Console

SCA-352 Console with IQ-750, pressure gauge and compass made me more experienced diver. It is not very bulky or heavy. I don't have QD with it, but it is not a downside.

I regularly use two mixes for better decompression or multilevel diving. Tusa IQ-750 is easy to learn and use. It has many setting options, so I'm in a full control. Battery is easy to change and all dive data is safe during battery replacement.

Display is big enough and not overcrowded with numbers. It easy to see and read under any light conditions.

SPG keeps me fully aware about my air consumption, and compass is solid built. And console itself is a solid built too.

Alec, 23 June 2012 08:26
I Am Doing Great With Tusa IQ-750 As My Main!

I've chosen Tusa IQ-750 as an addition to my other dive gear from Tusa. I have it in console with pressure gauge (I didn't want to add a compass, because I thought it would be too bulky for me). I logged more than 200 dives on it and didn't have any issues.

Front buttons are easy to press even if I have thick gloves, all combos became intuitive after I spent some time with user's docs and playing with dive computer at the same time. But even after that, I had to get used to displayed notations during alarms at the very beginning - some of the letters just didn't fit! And everything came to normal after a few dives.

Display is easy to read and digits are clearly seen under any point of view. Alarms are loud and backlight is strong - so I don't miss anything. Decompression is perfectly managed and all display layout is clearly readable and intuitive.

 

When it came time for battery replacement - I did it myself without any help just by following user docs, nice and quick! Data retention worked great - I didn't miss any piece of data!

Data port on the back of computer is a bit tricky - sometimes I have to push that cable towards Tusa's body and hold to make steady connection with my PC - and that's only one downside of this dive computer.

I saw few other reviews and looks like it is main issue with data cables and it is not only in Tusa, other dive computers have the same - push data cable and hold it to make PC recognize dive computer!

Tusa IQ-750 does the job perfectly! I don't regret because of my investment!



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