Originally Posted by Tuzlo
Wouldnt you want the BK regulated as well? Im not sure ai want a BK going full out with a 5500 W element in it an d no control. Is it possible to have 2 probes and use a switch?
Good question. The particular PID (in the drawing) that I recommend is the Auber Instruments SYL-2352. It has 2 modes that are commonly used for brewing. The first controls the element heating to reach and maintain a set temperature. The second is manual mode where it delivers a percent of power from 0 to 100%. This mode allows you to control the rate of boil. You cannot control the boil rate by temperature. 212°F is a simmer boil and 120°F is also a raging boil. The difference is the amount of power delivered.
BTW, you can use 2 temp probes and switch them. It is really not necessary for the boil kettle - unless you're chilling the wort using an immersion chiller. If you decide to go this route, it is a must that you choose the RTD temp probes - IMHO.
Type K probes do not work well with switches or when their signal lines are spliced to a different wire type. Every splice or connection becomes a new temperature measuring junction. Auber Instruments carries special connectors and extension cable for the type K probes.
Hope this helps.