Using an Auber Instruments PID controller ($36) with a Model: TC-K6 thermocouple ($6.85), a project box ($15.50) and an light/alarm ($8.22) Total ($66.57) I came up with a nice electronic way to monitor temps and notify me if I go over a set temp. I drilled an tapped a 1/4-20 hole in the top of the stove for the thermocouple. The controller runs on 115v AC so I tied it into the fan power line. The light/buzzer is also 115V so it ties directly into the controller. The directions show how to program it to go off at your setting.
This is installed on a Clydesdale insert.
http://www.auberins.com/index.php?main_page=product_info&cPath=1&products_id=14
http://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=2
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=24
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=221
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=221
This is installed on a Clydesdale insert.
http://www.auberins.com/index.php?main_page=product_info&cPath=1&products_id=14
http://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=2
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=24
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=221
http://www.auberins.com/index.php?main_page=product_info&cPath=7&products_id=221