| 摘要 |
PROBLEM TO BE SOLVED: To provide a cheap pressure measuring device which can prevent invasion of raindrop, corrosive gas, dust, etc., and can stably measure pressure with a simple constitution. SOLUTION: The pressure measuring device comprises a main body containing a measuring diaphragm, a reference chamber which is provided on one side of the measuring diaphragm and is added by the atmospheric pressure, and a ventilation hole provided to the main body and connecting the reference chamber and the outside. A flexible membrane absorbing volume variation due to increase and decrease of air volume in the ventilation hole which is caused by variation of temperature of used environment and of the air is provided in the ventilation hole by sealing the hole.
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