Patent ID: 6140615
Filing Date: 2000-10-31
Classification: A01K,H05B

Abstract:
A heater apparatus attachable to an aquarium, said heater apparatus comprising:a heater portion attachable to an exterior of an aquarium, wherein said heater portion contains:a flat heater;a first temperature sensor located close to said flat heater, said first temperature sensor detecting temperature of said flat heater;a second temperature sensor spaced from said flat heater, said second temperature sensor detecting temperature of the aquarium; anda controller including:current controlling means for turning off said flat heater when a temperature detected by said second temperature sensor exceeds a first temperature, turning on said flat heater when the temperature detected by said second temperature sensor falls below the first temperature, reducing current flow to said flat heater when the temperature detected by said first temperature sensor exceeds an upper limit temperature, and increasing current flow to said flat heater when the temperature detected by said first temperature sensor drops below a lower limit temperature; andtemperature rise monitoring means for monitoring a temperature rise, within a monitoring time, of the temperature detected by said first temperature sensor, and stopping current flow to said flat heater if the upper limit temperature is reached in less than the monitoring time.