| 摘要 |
<p>The present invention relates to a detecting apparatus for door-opening for explosion protection, including: a supply pipe which supplies air; an exhaust pipe which exhausts the air; a pneumatic switch unit which blocks or supplies the air in the supply pipe to the exhaust pipe according a change of a switch depending on the opened or closed state of a door; a pressure sensor unit which detects pressure in the exhaust pipe; and a control unit which compares the pressure detected in the pressure unit and reference pressure, determines that the door should be in the opened state in the case when the detected pressure is lower than the reference pressure, and displays the result on a display unit. The present invention does not use an electrical method when detecting the opened state and the closed state of the door, but uses a method for detecting changes in the pressure of the air changing according to the state of the door, thereby preventing sparks from being generated. Therefore, the present invention has an explosion protection characteristic.</p> |
