ELECTROCONDUCTIVITY METER

PROBLEM TO BE SOLVED: To provide an electroconductivity meter in which calibration can be performed through simple operation and considerable alteration of hardware such as a converter or excessive power consumption is not required.SOLUTION: An electroconductivity meter comprises a detector 100 which includes a sensor unit 109 for streaming a current to a liquid to be measured, and a converter which converts an output signal of the sensor unit 109 and measures electroconductivity of the liquid to be measured. In the electroconductivity meter, an equivalent resistor which simulates the liquid to be measured in a predetermined temperature is connected to the converter in place of the sensor unit 109, thereby calibrating a measurement. Inside the detector 100, a lead switch 106 is disposed which is turned on to connect the equivalent resistor 108 to the converter, and outside the detector 100, a permanent magnet 110 is disposed which operates a magnetic flux when moving toward the lead switch 106, to turn on the lead switch 106.