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When fuel is made with a Pipe Gas Mixer, the desired ratio will be wrong if the gases have different temperatures. By using volume pumps and some logic circuits, the correct 2:1 fuel mix can be obtained without waiting for the temperature to equalize.

This setup measures the total fuel pressure and the ratio of oxygen in the fuel mixture, these values are then multiplied to calculate the partial oxygen pressure which is directly linked to the amount of moles of oxygen in the mixture. This also gives control over the total pressure (which is tripple the partial pressure in a 2:1 mixture) which helps with safety. Volatiles are added automatically whenever the ratio of oxygen in the fuel mix becomes too high.

If so desired, one can add a single logic processer to this setup to let the player insert the desired total pressure instead of the desired partial oxygen pressure. Simply replace the B2 memory with 1 math multiplier (B2a) and 1 memory (B2b), then have B2a multiply the desired total pressure (set with B2b) with the desired oxygen ratio (B5), and let B2 compare B2a vs. A3 instead. New wires must also be added to connect all these parts together.

A problem with this setup is that it will continue to add oxygen even if the volatile storage is empty, which will ruin the fuel ratio. This can be fixed either by adding a valve (infront of the volume pumps so it doesn't blow the pipe) for manual control of the oxygen flow, or by adding circuits to shut it off. Another issue is that tweaking the memory values while the system is running can cause the fuel tank to overpressurize and burst, keep suspects with screwdrivers away from the area.

Components

• Gas pipes
• Gas storage
• Wires
• 4 Logic I/O
• 3 Logic Processor
• 2 Logic Memory
• 2 Volume pumps
• 1 Pipe Analyzer (requires electrum)

Example of how to place the circuit in a location where it will blow up if the fuel self ignites

Setup

1. Connect volume pumps from O2/H2 respectively leading towards the fuel side
2. Connect the pipe analyzer on the fuel side
3. Optional: Use a Power Area Control or Transformer to isolate the logical components to their own network. This also makes it easy to shut off the system.
4. Place logical components

• A1: Reader for pipe analyzer, total pressure (in KPa)
• A2: Reader for pipe analyzer, ratioOxygen (between 0 and 1)
• A3: Math multiplier, A1*A2 (this is the partial oxygen pressure in the fuel tank)

• B1: Compare, B2 vs. A3, greater
• B2: Memory, 2000 (desired partial oxygen pressure, 3x this will be the total pressure)
• B3: Writer for Oxygen volume pump, on

• B4: Compare, A2 vs. B5, greater
• B5: Memory, 0.334 (use Labeller to set this value)
• B6: Writer for Volatiles volume pump, on

Notes

• Warm fuel can self ignite. Don't mix fuel near critical infrastructure.
• For safety, set the desired partial oxygen pressure to 2000 max, the total pressure will be tripple this value in kPa.
• If the system runs out of volatiles, the fuel mix will still be fed oxygen.
• If the system runs out of oxygen, the system will stop adding volatiles.
• Give volume pumps a 1:2 ratio on their values, this reduces errors in the fuel mix when the system is rebalancing.
• Power use 120 W on standby