There are no guidelines, but please select a general product or a highly reliable type depending on the set you are considering, and select the size from the perspective of space. Select a resistance value that is easy to handle at the temperature monitoring point. XH103 (R25 = 10kΩ) and WF104 (R25 = 100kΩ) are commonly used. Determine the deviation of the resistance value from the required temperature accuracy to be measured.