| 摘要 |
<p>PURPOSE:To provide an air flow rate measuring instrument which can be easily manufactured at a low cost and can detect the flow rate of air with high accuracy by providing an intermediate temperature sensitive resistor between an exothermic resistor and temperature sensitive resistor and setting the normal operating temperature of the intermediate temperature sensitive resistor higher than that of the temperature sensitive resistor. CONSTITUTION:The flow rate of air is measured with a circuit module 9 in which an exothermic resistor 1 and temperature sensitive resistor 2 are set in a by-pass and an intermediate temperature sensitive resistor 3 is provided between the resistors 1 and 2. The temperature of the resistor 1 is set at 200 deg.C and the normal operating temperature of the resistor 2 is set at 30 deg.C. When the normal operating temperature of the resistor 3 is set higher than that of the resistor 2, for example, at 50 deg.C, the response time and warming-up time of the instrument at the rising time can be remarkably improved. The best characteristic of the instrument can be found by combining the resistance values of the resistors 2 and 3, because the resistance value of the resistors 2 and 3 can be changed by, for example, 100-1,000kOMEGA when the temperatures of the resistors 2 and 3 are changed by 2-30 deg.C.</p> |
