This brewing system has been in operation for about 5 years in a totaly manual operation making 6 gallon batches with up to 25 Lbs grain for 1.100 max SG. Most of the batches brewed on the old system by myself and SWBO have been for entry in sanctioned competitions or give away to friends. Here are a few pictures of the old system
http://picasaweb.google.com/kevin.ladue/OldBrewingSystem
The new control system operation should go as follows,
Fill water tank with total amount of water needed for brewing session
Pump measured amount of water through heater to mash tun at strike water temp
Mash in, (start mill, screw conveyor, stirrer) "future feature"
Recirculate wort and control flow at 1 GPM
Pump water through boiler to make steam for step mash, control flow of water and fuel to control mixed wort/steam temperature
Divert wort to boil kettle and control flow for 30 minute sparge
Use mash tun level sensor for sparge flow correction and sparge cycle control
Pump water through boiler to heat to sparge temp, control fuel to maintain temp
Fire boil kettle after 1 gallon of wort is in kettle and control fuel to hold 210 Deg temp
Ramp kettle burner fuel control to boil setting when 75% of wort is in kettle
Open glycol valve to wort cooler and open kettle outlet valve
Open O2 valve for 3.5 minutes at .5 SCFH for oxygen injection
Components:
Fuel control, STEC SEC 4400&4500 mass flow controllers
Ignition, Honeywell S87 modules with Q317 pilot assembly
Level control, Sensor tec and dresser 0-50" wc pressure transmitters
Flow measurement, Malema flow transmitters
Flow control, Belimo 24V proportional control valves
Flow diversion, Swagelok 24V actuated 3 way valve
O2 control, SS solenoid valve and Dwyer visifloat flow control
Water fill, glycol and fuel lockout, Asco and parker solenoid valves