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Harvey Barnstead SterileMax Retrofit

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I recently did up a replacement controller PCB for a customer who was having runtime issues.  The replacement PCB and firmware exactly replaces the old 68k controller system.  It is a drop-in replacement with exactly compatible connectors, power supply, and input and output signalling.

The SterileMax was a prolific autoclave, and can economically fulfill your needs.

If you have this version or similar, you can use my replacement.
The replacement PCB is MUCH smaller than the OEM.

Replacement controller for the PC1277X1, top-side.
The PCB is about 1/3 the size of the original.  It helps to not use any DIP parts.

Schematic for the controller.
If you're interested in this design or a slightly modified version for your sterilizer, comment below and I can hook you up.

The main issue this solved was over-pressure in the chamber during a run.  The NVSRAM's battery died and it lost all the configuration data.  Once this happened the system would heat for exactly 4 minutes and then shut all vents, continue to heat, and eventually hit the 45 PSI relief valve or software safety.  Basically, a dumb system that only the OEM knows how to config.

~JWilly

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