초록 ▼

In a temperature sensor with a platinum resistance thermometer accommodated in a tube-shaped housing, the platinum resistance layer belonging thereto should be protected against pollution or contamination of the platinum, since the electrochemical characteristics of platinum can be reduced by substa

In a temperature sensor with a platinum resistance thermometer accommodated in a tube-shaped housing, the platinum resistance layer belonging thereto should be protected against pollution or contamination of the platinum, since the electrochemical characteristics of platinum can be reduced by substances in the surroundings in the event of too low a partial pressure of oxygen. For this purpose, a mechanically solid and liquid-impermeable, connection is provided in the connection region of the tube-shaped housing, which permits an admission of air-oxygen into the housing from the environment of the connecting cable. The air-oxygen admission is made possible through a liquid-impermeable oxygen-permeable jacket for the connecting cable and/or over an accompanying connecting plug, whereby the admission of air-oxygen takes place along a glass filament filler running parallel to the electrical leads inside the jacket of the connecting cable.

대표청구항 ▼

[ We claim:] [1.] A temperature sensor comprising:a platinum-containing temperature-dependent measurement resistance (1);an oxygen-permeable diffusion barrier, wherein the platinum-containing temperature-dependent measurement resistance (1) is shielded from ambient atmosphere by the oxygen-permeable

[ We claim:] [1.] A temperature sensor comprising:a platinum-containing temperature-dependent measurement resistance (1);an oxygen-permeable diffusion barrier, wherein the platinum-containing temperature-dependent measurement resistance (1) is shielded from ambient atmosphere by the oxygen-permeable diffusion barrier;at least one conducting lead (6, 6') and at least one contact pad (5, 5'), the conducting lead (6, 6') being electrically connected to the temperature-dependent measurement resistance (1) by the at least one contact pad (5, 5');a gas- and liquid-impermeable housing (4) surrounding the at least one conducting lead (6, 6'), the at least one contact pad (5, 5'), and the temperature-dependent measurement resistance (1);a ceramic casting compound disposed between the temperature-dependent measurement resistance (1) and the gas- and liquid-impermeable housing (4), wherein the ceramic casting compound is form-fitting of the temperature-dependent measurement resistance (1), and holds the temperature-dependent measurement resistance (1) stably within the housing (4);a connecting cable (13) having a first end and a second end, the first end of the connecting cable (13) being electrically connected with the measurement resistance (1) by the at least one conducting lead (6, 6'); anda protective tube (7) providing a mechanically solid and liquid-impermeable connection between the connecting cable (13) and the housing (4), the connection permitting an admission of air-oxygen from the ambient atmosphere through the connecting cable, and in a longitudinal direction with respect to the connecting cable (13), into the housing (4), the at least one conducting lead (6, 6') running through the protective tube (7) to provide the electrical connection between the measurement resistance (1) and the connecting cable (13).