Check the label: Thermistors usually have a label that shows their model number.
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Check drawings: If any drawings are available, check to see if they contain model information.
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Check the manual: If there is a manual, check to see if it contains model information.
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Ask the manufacturer for help: If you still cannot determine the model, contact the manufacturer for help.
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Please note that if the thermistor is already installed and in use, do not attempt to disassemble it yourself to avoid safety risks.