熱電抵抗温度計(II)
1978 年 47 巻 8 号 p. 740-744
詳細
1978 年 47 巻 8 号 p. 740-744
A thermoelectric resistance thermometer for distant measurement described here is a grafted thermometer composed of a thermocouple and a resistance thermometer.
The grafting portion of the thermoelectric resistance thermometer is connected by triple copper leading wiers of equal resistance to the electric meter.
A constant current determined by the characteristics of both the thermocouple and the resistance bulb flows through the circuit composed of the couple and resistance bulb, and the potential difference between two fixed points in the circuit is measured. It is proved theoreti-cally that the measured potential difference gives the temperature to be determined.
Experiments are carried out for the thermoelectric resistance thermometer with triple copper wires of 5_??_30m. long. The results show that the outputs of the thermoelectric resis-tance thermometer are in good agreement with the outputs of the thermoelectric thermometer with the reference' temperature at 0°C, and are independent of the length of lead wires and graft temperature.
