Android DIR Wetnotes 

Functionality and discription

Android App contains following components:

  • Gas blender - calculates the steps of gas blending for partial pressure mixing.
  • Topoff
  • MOD - END shows whole operative range of detph for breathing gas. The narcotoc factors of each gas component can be set by user. Please keep in mind following:

Narcotic factors of gases:(Chemical sign, name, factors (divide by / multiply by) )He, helium, 4.26 / 0.23
Ne, neon, 3.58 / 0.28
H2, hydrogen, 1.83 / 0.55
N2, nitrogen, 1 / 1
Ar, argon, 0.43 / 2.33
Kr, krypton, 0.14 / 7.14
Xe, xenon, 0.039 / 25.64
(Source: "The Physiology and Medicine of Diving" by Peter Bennett and David Elliott, 4th edition, 1993, W.B.Saunders Company Ltd, London.)


  • pSCR  - shows drop of O2 fraction in loop of pSCR with constant dump ratio

Most important features

  • Gas model: ideal gas, real gas (vdw)
  • Topoff gas is adjustable
  • Fill order is adjustable. The mode "He, AutoEAN(21% - 45%)" is to use with nitrox membranes automates.
  • Price calculation
  • The gases can be set manually or picked up from the list
  • Units are: metric and imperial
  • Detailled view shows amount and wait of of gases.
  • Languages: german, english, french, russian

Screenshots gas blender

Screenshot 2013-03-29-21-37-57Screenshot 2013-03-29-21-38-09Screenshot 2013-03-29-21-38-23Screenshot 2013-03-29-21-38-40

Screenshots Topoff

Screenshot 2013-05-11-17-49-19Screenshot 2013-05-11-17-49-41

Screenshots MOD - END

Screenshot 2013-04-16-10-56-01Screenshot 2013-04-16-10-57-02

Screenshots pSCR

Screenshot 2013-04-18-18-22-46Screenshot 2013-04-18-18-23-23Screenshot 2013-04-18-18-23-33Screenshot 2013-04-18-18-23-45Screenshot 2013-04-18-18-23-57

Supported Android- versions

DIR Wetnotes is compatible with Android versions 2.1 and higher. API Level 7

App can be downloaded here:

Google Play Store




Welcome at the homepage of "Gas blender toolkit"

Gas blender  toolkit (successor to "DIR-Wetnotes") is a gas mixer program for divers and gas blenders

The functional scope

  • Gas mixer according to partial pressure method with variable filling sequences (Fig. 1)
  • Delta gas or gas mixer with the continuous method (Fig. 2)
  • Overflow from a storage tank with calculation of the number of possible fillings (Fig. 3)
  • Gas MOD (Fig.4)
  • PSCR - calculation of oxygen reduction in the loop of pSCR with constant volume ratio (Fig. 5)

The main features

  • Real gas (VdW) and ideal gas calculations
  • Cost calculation for gas fillings
  • Standard gases can be set individually.
  • Consideration of heating during filling.
  • Easy handling
  • Supported languages: English, German, Russian

Gas mixer according to partial pressure method

Fig. 1 gas blender (partial pressure)

Delta gas or gas mixer with the continuous method  4

Fig. 2 continuous method

Overflow from a storage tank with calculation of the number of possible fillings  1

Fig. 3 Topoff

Gas MOD  2

Fig. 4 Gas MOD

pSCR Oxygen fraction lowering  5

Fig. 5 pSCR oxygen fraction lowering in the loop 



The previous versions "DIR Wetnotes" were available in different variants. As a PC - Java application and an Android version.


DIR-Wetnotes - java application for desktop PCs

blender en

Android App

The smartphone application (for Android only) contains

  • Gas blender

  • Delta gas calculation

  • Topoff
  • MOD - END

  • pSCR calculation of oxygen drop in circuit

avaible at Google Play Store.

Screenshot 2016-04-27-11-04-40


Desktop Version für Ihren PC


  • MOD and END calculation (narcotic effect of oxygen and He is adjustable)
  • Topoff
  • Tanks equalisation
  • Gas blender for partial pressure mixing. Ideal and real gas, Fillorder and topoff gas are adjustable. Price calculation
  • pSCR calculation of oxygen drop


desktop-mod-de desktop-topoff-de desktop-equalizer-dedesktop-blender-dedesktop-pscr-de

PC version is written in Java and runs on Windows, Mac, Linux und Unix.

This application runs with Java Webstart. Application can be used offline. Java is required.

Installation via Webstart

Click link below to get it

DIR Wetnotes: DeutschEnglishFrancais (translation is not yet completed) Russian Hebrew

Start application without Webstart

Download application jar file: wetnotes.jar 

Check digital signature: wetnotes.jar.sig

Signed with a key F067 03B5 D0F2 77CC 457D  9DB0 7E6E E5D0 F37C E2A2

it is a subkey of my main key PGP Key: E74A0B0C

Fingerprint: 38A0 D0CC BD23 1707 B0AF  D158 E9D7 6E3F E74A 0B0C

Run the programm by click on file wetnotes.jar or start it from command prompt: java -jar wetnotes.jar -lng en


Your comments are welcome.



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