| 摘要 |
<p>A resistor for a thermal type of flowmeter includes a ceramic substrate (21), a thin platinum film (22) formed on the surface of the ceramic substrate, and lead wires (20) for connecting the thin platinum film with an external circuit, and is located in a fluid to detect its flow rate. When the resistance value, R ( OMEGA ), of the resistor for a thermal type of flowmeter is expressed in terms of a function of temperature, T ( DEG C): <MATH> where R0 is the resistance value in OMEGA of the resistor for a thermal type of flowmeter at 0 DEG C, alpha is the first-order term coefficient of the temperature coefficient of resistance, and beta is the second-order term coefficient of the temperature coefficient of resistance, the value of the first-order term coefficient, alpha , of the temperature coefficient of resistance is at least 3,650 ppm/ DEG C. A deviation in the temperature coefficient of resistance can be effectively reduced or eliminated, making circuit regulation easier. <IMAGE></p> |
