| 摘要 |
A new and improved level controller for sensing the level of a fluid in a container is provided. The controller includes a heater with a thermocouple connected thereto and wherein the thermocouple is adapted to sense the temperature and the rate of rise of temperature. Immersion of the thermocouple in a fluid cools the thermocouple. When the thermocouple is not immersed in the fluid it is heated by the heating element to establish an alarm condition. An alarm condition is established when the rate of rise of temperature exceeds a predetermined rate of rise and/or when the temperature exceeds a predetermined maximum temperature.
|
