A capacitance diaphragm gauge senses pressure through deflection of a diaphragm that changes a capacitor's capacitance. Its head can have a different temperature from the vessel being measured, allowing thermal transpiration in the connecting tube to change the head pressure. [ref]
https://arxiv.org/html/1308.6794. Daudé, Elandaloussi and Janssen, §I, diaphragm-gauge principle and thermal-transpiration effect
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