Baltic Blender2.0 - App Store

Technical diving gas partial-pressure blending app. Supports nitrox and - via in-app purchase upgrades - trimix and pricing/volumes used.

Baltic Blender uses the GERG-2004 real gas model to allow a SCUBA gas blender to easily and accurately use partial-pressure techniques to blend available gasses to the desired final mixture. It is not intended as a substitute for proper training and certification in the safety, handling, and blending of high pressure gasses, but rather as a tool to perform the complex math required to reach the desired mixture. In such training classes, you would learn important safety information about the handling of high-pressure gasses. SCUBA gas blending is not to be taken lightly; it is one of the only activities where a mistake may not just kill you, but also those around you, or possibly the diver you are blending the gas for.

Traditional blending techniques have two inherent errors which the blender must learn to compensate for, traditionally by adding a fudge-factor.

* First, traditional blending uses the simple ideal gas model, but the gasses we breathe, at SCUBA cylinder pressures, are far from ideal gasses. Baltic Blender uses the GERG-2004 real gas model which predicts how the real-world gasses behave.

* Second, traditional blending generally ignores the heating of the cylinder as gas is introduced, requiring the blender to either fudge or allow the cylinder to cool. Baltic Blender requires that the blender allow the temperature to stabilize, rather than cool, between each step, so that an accurate measurement of the cylinder wall temperature using a commercially available infrared thermometer reflects the temperature of the gas inside.

Supports using preblended gas for eg. using leftover trimix or for using banked mixes.

Features ;
* Nitrox
* Trimix (via in-app purchase)
* Volume consumed & Pricing (via in-app purchase)
* Blending and topping off
* Per cylinder configurable preblend
* Metric and imperial units.
* Simultaneous work on multiple cylinders
* Grouping of tanks and pricing
* Real Gas Law using GERG-2004
* Easy to access temperature adjustments
* Configurable list of default gases
* Configurable standard temperature
* Bill printing/emailing

You can enter the data for multiple cylinders at once. Cylinders can be placed in groups for billing purposes.

** Trimix, volume consumed and pricing is only available via in-app purchase upgrades. **

GERG-2004; Kunz, O.; Klimeck, R.; Wagner, W.; Jaeschke, M. (2007): The GERG-2004 Wide-Range Equation of State for Natural Gases and Other Mixtures: GERG Technical Monograph 15 (2007) and Fortschr.-Ber. VDI, Reihe 6, Nr. 557, VDI Verlag, Düsseldorf, 2007.

The partial GERG-2004 implementation used to calculate the compressibility factors of oxygen, helium, nitrogen and their mixtures in the gas phase was inspired by open source code written by David de Marneffe (daviddemarneffe[at]y a h o o . c o m) in December 2007.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Version History Complete rewrite of UI for current iOS look and feel. 2.0 8h ago Fix hang when pressure/gas input is dismissed. 1.10 04/22/2021 Fixes for iOS14 and iPhone 12 1.9 12/28/2020 Updated for iOS 14. 1.8 12/11/2020 Further improvements to mapping adding gas back to volume. Now filling a 80 cuft 3000 psi tank from 0 to 3000 psi with air will show 80 cuft was added and not 79.6 cuft. 1.7 07/24/2017 - Use real gas law for pricing volume calculations.
- Fix bug where app crashed on high values in working pressure. 1.6 06/13/2017 - Fixes for iOS10 and 64bit compatible. 1.5 05/26/2017 - iOS8 support.
- Support pricing for air by volume.
- Minor UI bugs fixed. 1.4 11/04/2014 - iOS7 UI.
- Configurable ppO2 END display for mixture selector. 1.3 10/28/2013 - Fixes hang when editing cylinder name and tapping pressure/mix (Issue #61).
- Minor UI fixes/improvements. 1.2 01/12/2013 - iPhone5 and iOS6 compatibility.
- Configurable Standard Temperature, no longer locked at 21℃/70℉.
- Configurable list of default gases.
- Print/email bills with custom header.
- Minor internationalisation fixes. 1.1 11/06/2012 First release. 1.0 05/08/2012 0.30 03/29/2012