| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressurizing system of an explosion-proof chamber, easily grasping a driving state of the pressurizing system as well as that of a fan. SOLUTION: The pressurizing system of the explosion-proof chamber is structured to prevent air from entering the chamber from surrounding environment by keeping an atmospheric pressure in the chamber high by supplying pressurization air into the chamber through the fan. The pressuring system has: a relay R3 for detecting start/stop of the fan; a relay R2 for detecting start/stop of the pressurizing system; and an a-contact r2 and an a-contact r3 of the relay R2 and the relay R3 for lighting a lamp L for indicating start detection states of the relay R2 and the relay R3 when both the relay R2 and the relay R3 detect start states. COPYRIGHT: (C)2009,JPO&INPIT |
