Mar 16, 2021
How do I know if the KSD301 temperature control switch is broken?
Use a multimeter to measure the two joints. Generally, at room temperature, the contacts of this switch are connected. For switches below 100℃, use hot water at the corresponding temperature, and 100℃ can be heated by a soldering iron. After the temperature rises, the switch can be turned off normally. When the temperature drops, the connection can be restored. This temperature control is basically good.
The KSD301 series product is a temperature control switch that uses a bimetal as a temperature sensing component. It should be open when measuring with a multimeter at room temperature, and then burn it with a fire. After hearing a sound, use a multimeter to measure it. It should be broken. The KSD301 series product is a temperature control switch that uses a bimetal as a temperature sensing component. When the electrical appliance is working normally, the bimetal is in a free state and the contacts are in a closed/open state. When the temperature reaches the operating temperature, the bimetal is heated to generate internal stress and act quickly, opening/closing the contacts, and cutting/connecting the circuit. , So as to play a role in temperature control. When the electrical appliance cools to the reset temperature, the contact automatically closes/opens and resumes normal operation.
Checking the quality of the thermostat is to see if it can be turned on (off) at the marked temperature. The automatic disconnect type is used on the water dispenser. The thermostat is installed close to the water tank. When the water temperature reaches 97°C, the two contacts in the thermostat will separate, and the path connected to the two pins will be disconnected. Stop heating.
The detection is good or bad is to detect whether the contact bounce (open circuit) can occur under the marked temperature (operating point). When the factory leaves the factory, all thermostats are placed in the large oven and connected to the power supply. The short-circuit temperature is observed by heating, which is the operating point of this thermostat. If you want to test it yourself, you can touch the lower shell of the thermostat to a heating object (hot water), connect both ends of the pin to a DC path (10v is enough), and then pay attention to the temperature of the hot water to see if it is disconnected at 97 degrees. . Generally ±5 degrees is qualified.
