초록 ▼

An installation for melting of snow or ice, e.g. at roof downpipes on flat roofs, in gutters and the like, comprising a heating means (11), a temperature sensor means (4,6) and a control unit (1) for connecting and disconnecting the heating means (11) in dependence on sensed temperature. The tempera

An installation for melting of snow or ice, e.g. at roof downpipes on flat roofs, in gutters and the like, comprising a heating means (11), a temperature sensor means (4,6) and a control unit (1) for connecting and disconnecting the heating means (11) in dependence on sensed temperature. The temperature sensor means comprises a first temperature sensor (4) for sensing the surface temperature at the place of snow or ice melting, and a second temperature sensor (6) for sensing the air temperature at the topical place. On the surface there is further arranged a snow sensor (7) which is connected by the control unit (1) when the first temperature sensor (4) at a rising temperatures registers that the surface temperature rises above a chosen minus value, or when the second temperature sensor (6) at a falling temperature registers that the air temperature falls below a chosen plus value, the control unit (1) causing connection of the heating means (11) if the snow sensor (7) registers snow during a chosen time period, and further keeping the heating means (11) connected at least until the second temperature sensor (6) at a rising temperature registers that the air temperature rises above the chosen plus value, or at least until the first temperature sensor (4) at a falling temperature registers that the surface temperature falls below the chosen minus value, but in both cases only on the condition that the snow sensor (7) at intervals registers snow.

대표청구항 ▼

[ I claim:] [1.] An installation for melting of snow and ice, especially on the surface of roofs, roof downpipes and gutters, and around manholes in roadways and the like, comprising:a heating means for melting snow or ice on said surface;a temperature sensor means comprising a first temperature sen

[ I claim:] [1.] An installation for melting of snow and ice, especially on the surface of roofs, roof downpipes and gutters, and around manholes in roadways and the like, comprising:a heating means for melting snow or ice on said surface;a temperature sensor means comprising a first temperature sensor for sensing the temperature of said surface, and a second temperature sensor ambient air temperature at said surface;a control unit for connecting and disconnecting said heating means in dependence on the temperatures sensed by said temperature sensors; anda snow sensor arranged on said surface and connected to said control unit,said control unit being arranged to connect said snow sensor when said first temperature sensor at a rising temperature registers that the surface temperature rises above a chosen minus value, or when the second temperature sensor at a falling temperature registers that the air temperature falls below a chosen plus value, the control unit causing connection of the heating means of the snow sensor registers snow during a chosen time period, and further keeping the heating means connected at least until the second temperature sensor at a rising temperature registers that the air temperature rises above the chosen plus value, or at least until the first temperature sensor at a falling temperature registers that the surface temperature falls below the chosen minus value, but in both cases only on the condition that the snow sensor registers snow during said chosen time period.