JPH01144992U - - Google Patents
Info
- Publication number
- JPH01144992U JPH01144992U JP3830488U JP3830488U JPH01144992U JP H01144992 U JPH01144992 U JP H01144992U JP 3830488 U JP3830488 U JP 3830488U JP 3830488 U JP3830488 U JP 3830488U JP H01144992 U JPH01144992 U JP H01144992U
- Authority
- JP
- Japan
- Prior art keywords
- level
- fire alarm
- light source
- reference light
- optical window
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims 4
- 238000011109 contamination Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988038304U JP2507204Y2 (ja) | 1988-03-25 | 1988-03-25 | 火災警報装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988038304U JP2507204Y2 (ja) | 1988-03-25 | 1988-03-25 | 火災警報装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01144992U true JPH01144992U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1989-10-05 |
JP2507204Y2 JP2507204Y2 (ja) | 1996-08-14 |
Family
ID=31264862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1988038304U Expired - Lifetime JP2507204Y2 (ja) | 1988-03-25 | 1988-03-25 | 火災警報装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2507204Y2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04367999A (ja) * | 1991-06-15 | 1992-12-21 | Nittan Co Ltd | 炎感知装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56133548U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1980-03-10 | 1981-10-09 |
-
1988
- 1988-03-25 JP JP1988038304U patent/JP2507204Y2/ja not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56133548U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1980-03-10 | 1981-10-09 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04367999A (ja) * | 1991-06-15 | 1992-12-21 | Nittan Co Ltd | 炎感知装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2507204Y2 (ja) | 1996-08-14 |
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