Electronic calcification indicator for flow heaters heated by PT

Details Electronic calcification indicator for flow heaters heated by PT Electronic calcification indicator for flow heaters heated by PT

1979-07-23

1981-09-29

Bartis, A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

99285, 99288, 219283, 219301, 219505, 219506, 222146HE, 340606, 340640, H05B 102, A47J 3156, A47J 3188, F24H 110

Patent

active

042924995

ABSTRACT:
A system is disclosed for indicating when a flow heater used for vaporization of water and heated by PTC resistors as heating elements therein must be decalcified. Within the flow heater a PTC resistor element is located at a water entry and also at a water exit region. A main PTC heater element is also provided between the entry and exit elements. Separate power supply lines are run to the exit and entry heating elements and an electronic circuit is provided which determines when a difference in current flow in the exit heating element compared to the entry heating element exceeds a given value indicative of the need for decalcification. The circuit connects with an indicator which is triggered when decalcification is required.

REFERENCES:
patent: 3781839 (1973-12-01), Bodge

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