Controls, Power, And Frame¶
The machine is only useful if it can start reliably, stay inside safe limits, and be serviced in the field without guesswork.
Shared-Thread Basis¶
The shared thread suggested:
- a startup heater around 1200 W
- pressure gauge and thermostat coverage
- conductivity checks
- manual feed and blowdown regulation for the first low-cost build
- a frame built around service access rather than compactness for its own sake1
OpenSling Reference Choice¶
The current reference architecture uses:
- a welded or bolted serviceable frame
- isolated wet and dry zones
- startup heat under operator control
- basic pressure, temperature, level, and product-quality instrumentation
- emergency stop and overpressure response
Minimum Instrument Set¶
| Signal | Purpose |
|---|---|
| Shell pressure | tracks core operating point |
| Compressor inlet and outlet pressure | tracks compression health |
| Feed and product temperature | tracks recovery performance |
| Tank level | prevents dry-run events |
| Product conductivity | basic screening before any stronger claims |
Frame Rules¶
- keep electronics above probable leak paths
- label every service valve
- leave wrench access around unions and clamps
- make sample collection possible while the machine is running
OpenSling Bias¶
Use more structure and visibility than a polished commercial box would. Open hardware wins when the next builder can understand it quickly.