Where is the temperature sensing area of a bimetallic thermometer?
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In a bimetallic thermometer, the temperature-sensing element is spiral-shaped and located within the temperature sensing rod. Regardless of its length, does this element remain of the same length no matter how deep it is inserted? For example, can a half-meter-long bimetallic strip be used to take accurate readings when inserted only 1–2 centimeters into the pipe?
Your question needs to be answered from two aspects: 1. The temperature sensing element should be less than 100 mm; it is likely to be around 50 mm to 70 mm. 2. Whether an accurate measurement can be achieved depends on the temperature distribution within the pipe; only 10–20 mm is inserted, and the exact situation is unknown, as the calibration standards require a much deeper insertion.