Abstract: A system that provides notice of a lost signal. A wireless device and a control device employ radio frequency identification (RFID) technology, which uses radio frequency signals to communicate with one another via communication link having a reception range. The control device transmits a signal to the wireless device via the communication link. The wireless device responds by transmitting a return signal via the communication link. The control device processes the return signal to determine if the wireless device is within the reception range, if not, the control device provides an audible, written or visual alarm.

Abstract: A cleaning agent/rinsing agent for cleaning a heating apparatus for cooking food are contained in a cartridge. The cartridge is sealed to prevent premature release of the cleaning/rinsing agents. Inside the cavity of the heating apparatus, a mechanism for opening the cartridge is located in the drain of the cavity of the heating apparatus. By pushing the cartridge onto the mechanism and twisting the cartridge, protruding edges of the mechanism penetrate the seal. Upon lifting the cartridge, the cleaning/rinsing agent drops out and into the cavity drain. The rinsing agent may be retained above the drain and cleaning box via encapsulation or the rinsing agent and configuration of the mechanism. The empty cartridge is removed and the cavity of the heating apparatus is ready for cleaning.