| 摘要 |
PROBLEM TO BE SOLVED: To automatically detect the presence/absence of leakage of a refrigerant due to the presence/absence of a signal reception by providing a reflector on the internal wall of a sight glass, and providing a transmitting section and a receiving section on the outside of the sight glass. SOLUTION: On a moisture indicator 7, a peep hole 7A made of glass, a moisture detecting portion 7B, a reflector 7C, and a sensor 7D are provided, and on the sensor 7D, a transmitting portion 7E which transmits an infrared ray as a signal, and a receiving portion 7F which receives the infrared ray are provided. Then, when leakage of a refrigerant becomes large, a flush gas is mixed into the refrigerant which circulates in the moisture indicator, and the infrared ray from the transmitting section is irregularly reflected by the flush gas, and an amount of the infrared ray which is reflected by the reflector becomes small, and the amount of the infrared ray which is received by the receiving section becomes small, and the cannot be received by the sensor after all. Therefore, a refrigerant leakage being a specified amount or more is judged, and a control device operates an alarming apparatus, and the refrigerant leakage is notified to a user. |
