In SCR planer there are 3 programs: SCR planer, Gas Milage, and Gas Blender. They can all be used separately or simultaneously.

In SCR planer there are 6 input fields:

1. PO2: Which is the desired maximum partial pressure of the oxygen in the calculations.
2. Qs: Which is the gas flow of the supply gas, it is measured in liters per minute.
3. IP: This is the intermediate pressure from the first stage. It is used to calculate the "engineering" maximum operating depth (EMOD) of a semi-closed rebreather. This is the maximum depth where the velocity of the gas is still subsonic and delivers the required performance.
4. EANx: It is the O2% of the supply gas.
5. VO2: This is the oxygen consumption rate of an individual. It depends on the workload of the diver. Set the ranges between 1-2 LPM. Use it to calculate safe dives with tables or computers.
6. Depth: The maximum depth of the dive is to be registered here.

In SCR planer there are 4 read only fields or "Calculated Results".

1. EMOD: This is the engineering MOD of the rebreaher.
2. MOD: This is the maximum operating depth based on the O2 content of the supply gas (EANx). You can choose to calculate the MOD on the FiO2 (if you use a separate bailout bottle), but I prefer to calculate the MOD on the supply gas for educational purposes.
3. FiO2: This is the fraction of inspired oxygen into the lungs. An easier way of describing it is: "the breathing bag content". I use the value to calculate the EAD (Equivalent Air Depth) in my program. It works very close with the input value of the VO2, pay close attention to it! Enough said, if you are trained then you know what I am talking about. The equation that I use is the one from the book "Mastering rebreathers".
4. EAD: Equivalent Air Depth. Based on the FiO2 in this software.

In SCR Gas Milage there are 3 input fields:

1. Tank size: The total size of your tank(s) in liters! Thank God for the metric system! Don’t get me started on the imperial system, I mean just the name… Imperial… it gives me the chills…….. Enough said!
2. Pressure: In BAR! (If you are used to PSI try this then: Divide your final PSI value with 15 to get BAR)
3. Qs: Same as above: The gas flow of the supply gas.

In SCR Gas Milage there is 1 read only field or "Calculated Results".

1. Tank Capacity: It is presented in absolute minutes. You have to take into account for gas laws, adjust for use of BC/Dry suit (if you don’t use a separate bottle for it.), and for the bail-out. Use it wisely.

In SCR Gas Blender there are 4 input fields:

1. Desired O2 mix: This is where you put in O2% value of the desired mix.
2. Tank size: This is where put the TOTAL size of the tank(s) in liters.
3. Desired final pressure: Put in the desired final pressure in the tank(s), in BAR. Divide the PSI value with 15 to get BAR.
4. Price/L O2: This is the input for the price for the oxygen, use integers like: 0.10 or 0.20 etc……

In SCR Gas Blender there are 3 read only fields or "Calculated Results".

1. O2 to add: Just like it says. How much oxygen to add to the empty bottle(s).
2. Air to add: Just like it says. How much air to add to the bottle(s) to get our final mix.
3. Price: The total price, depends on the input value Price/L O2 and the O2 to add value.

That is it! Have fun and play around with my program. I built it for us rebreather divers.