How to measure the temperature sensor of an electric water heater with a multimeter
Electric water heater with a temperature sensor resistance will change with the ambient temperature changes, so the resistance of the digital multimeter resistance file to measure the resistance of the temperature sensor to know its good or bad. Here we introduce the specific measurement method.
Temperature sensor for electric water heater.
Electric water heater with a temperature sensor is generally a negative temperature coefficient of thermistor, resistance will decrease with the increase in temperature, its nominal value is measured at 25 ℃. This temperature sensor has a variety of nominal values, such as commonly used 10KΩ, 20KΩ, 50KΩ. measure the temperature sensor of the electric water heater is good or bad, according to the nominal value of the digital multimeter will be adjusted to the resistance of the appropriate gear, with the red and black pens of the multimeter were in contact with the metal piece of the plug, the multimeter should be shown to have a suitable resistance (and the nominal value will not be a big difference), and then pinch the metal part of the sensor. Then squeeze the metal part of the sensor, its resistance value if there is a certain change, then the sensor is basically good.
Digital multimeter.
Measurement, if the multimeter shows a small resistance value or infinity, indicating that the sensor has a problem, at this time you can check whether the sensor plug position is disconnected or wired, if the plug is good, then only the replacement of the same specifications of the temperature sensor.
