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Created by our own Chris Graham, MoreBeer! partner and Siebel Institute class teacher, the Temp and Float Control Box (previously named "The Graham Box") allows you to make your own SMART/HERMS system and control sparging through the included float switch.
To control mash temperature, plug the included temperature sensor into your mash tun thermowell (we also sell weldless thermowells) and the controller will shut off your pump when the recirculating mash temperature has reached your set point.
To control the sparge, plug the pump into the float outlet on the Graham box and place the included float switch into the mash tun during your sparge cycle. When the water level gets below the float switch, the pump turns on and feeds the sparge water into the mash tun.
You can even use the Temp and Float Control Box to control a refrigerator for fermentation by placing the temperature probe into your refrigerator and plugging your refrigerator into the Temp outlet.