ZenkO app for iPhone and iPad
TenkO is an intuitive app that tracks the pressure level of a gas in a rigid container over time. The equation used in the calculation of pressure change over time is based on Boyles law. Given an initial pressure, gas flow, and tank type (or tank constant), a change in gas pressure over time can be known.
In addition to giving a real-time change in pressure over a second, TenkO provides a real clock time and a counter-time projection at each 100 psi increment and at 15 minutes before 0 psi. Furthermore, TenkO comes preset with both alarm and notification times to alert the user of low gas pressure levels. For notifications, both a low pressure warning message and a 29 seconds ringtone will be triggered when the pressure level reaches that of 500, 400, 300, 200, 175, 150, 125, 100, 75, 50, 25, 0* psi and a time of 15 minutes before 0 psi. for alarms, a ringtone will be played at a pressure of 500, 200, 50, 0 psi, and at 15 minutes before 0 psi. Please note that notifications are only active when TenkO is in the background. Conversely, alarms are only active when TenkO is in the foreground and with notifications off.
If the tank type or the tank constant is unknown, TenkO can be used to find the tank constant of an unknown size tank. This can simply be done by entering the current flow and tank pressure of the unknown tank. The last variable that is needed for solving the unknown tank constant is time, or, more specifically, the time needed for a 100 psi drop in gas pressure in the unknown tank.
Even with a specific tank type, the sizes of the gas tanks or containers can vary greatly among the different gas tank or gas container manufacturers. One recommendation is to preform the above method in finding the tank constant of an unknown size tank. Note: the tank constant for each tank type used in TenkO is listed in the instructional page of the app: access this page by pushing the [red ◉] button found above the [Start] button. The other option is entering a custom tank constant value that matches the gas tank. Given that both tanks having the same pressure, a larger tank constant for one tank means that tank is larger than the other tank. Therefore, the pressure drop in the larger tank will be much slower than that of the smaller tank. Since TenkO can be used to monitor the pressure drop of a gas tank over time, TenkOs tank constant should be exactly or very similar to that of the tank, in question. After observing a 100 psi drop in TenkO PSI Display, check the pressure gauge of the gas tank. Does the pressure gauge psi matches that of TenkO? If yes, do nothing, then recheck again after a 200 or 300 psi drop. If it matches again, great. Check again, when the tank is close to empty. However, if there is a large discrepancy, then use a tank constant instead of using a tank type. if TenkO PSI Display value is lower than that of the tank gauge, then increase the custom tank constant value by an increment of 0.01 or 0.02 over that of the current tank type or tank constant value. For example, current tank type is an E tank with a 0.30 tank constant. So, 0.30 + 0.02 = 0.32. So enter 0.32 into green textfield. Repeat, if needed to get a closer match.
Disclaimer: TenkO serves only as a guide and an educational tool to show the relationships of gas pressure, gas flow, tank constant, and time. Due to specific manufacturer variations in tank sizes, gas temperature, different types of flow regulators, users competency in reading the pressure gauge accurately, user must exercise due diligence when using the notification and alarm utility functions of this app and must understand the many limitations aforesaid, but not limited to. By using TenkO, user has agreed to hold harmless Martian Mechanics, its founder and owner, officers, representative, and employees, from all and any claims, injuries, damages, losses, or suits, including attorney fees, that arise from using TenkO.