FR2298145A1 - Positive gradient temp. time response fire detectors - has several detector chambers each with non-return valve bypassed by capillary tube - Google Patents
Positive gradient temp. time response fire detectors - has several detector chambers each with non-return valve bypassed by capillary tubeInfo
- Publication number
- FR2298145A1 FR2298145A1 FR7501584A FR7501584A FR2298145A1 FR 2298145 A1 FR2298145 A1 FR 2298145A1 FR 7501584 A FR7501584 A FR 7501584A FR 7501584 A FR7501584 A FR 7501584A FR 2298145 A1 FR2298145 A1 FR 2298145A1
- Authority
- FR
- France
- Prior art keywords
- capillary tube
- return valve
- chambers
- time response
- membrane
- 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
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/04—Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/10—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of time, e.g. reacting only to a quick change of temperature
- G01K3/12—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of time, e.g. reacting only to a quick change of temperature based upon expansion or contraction of materials
Abstract
The pipework on which are connected the aerothermal chambers (1) and the fusible capsules (2) is connected directly to the fixed face of an arenoid manometer membrane (6) and indirectly to the fixed face of a second membrane (9) identical to the first. The interconnection to this second membrane is by a pipe (3) having a calibrated diaphragm (7) and by a chamber (8) enclosing air maintained at a constant determined pressure. This chamber (8) has a volume which is several times larger than that of the network comprising the pipework and aerothermal chambers. The two membranes are coaxial and their movable fuses are connected by a mechanical element (13) whose longitudinal movement on the common axis of the two membranes translate by their speed of movement and the amplitude of this movement, the existence of a sudden temperature variation with time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7501584A FR2298145A1 (en) | 1975-01-20 | 1975-01-20 | Positive gradient temp. time response fire detectors - has several detector chambers each with non-return valve bypassed by capillary tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7501584A FR2298145A1 (en) | 1975-01-20 | 1975-01-20 | Positive gradient temp. time response fire detectors - has several detector chambers each with non-return valve bypassed by capillary tube |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2298145A1 true FR2298145A1 (en) | 1976-08-13 |
FR2298145B3 FR2298145B3 (en) | 1977-10-14 |
Family
ID=9150022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7501584A Granted FR2298145A1 (en) | 1975-01-20 | 1975-01-20 | Positive gradient temp. time response fire detectors - has several detector chambers each with non-return valve bypassed by capillary tube |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2298145A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1016101A3 (en) * | 2004-06-28 | 2006-03-07 | L Air Liquide Belge | Device and method for detection of change of temperature, in particular for leak detection of liquid cryogenic. |
-
1975
- 1975-01-20 FR FR7501584A patent/FR2298145A1/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1016101A3 (en) * | 2004-06-28 | 2006-03-07 | L Air Liquide Belge | Device and method for detection of change of temperature, in particular for leak detection of liquid cryogenic. |
Also Published As
Publication number | Publication date |
---|---|
FR2298145B3 (en) | 1977-10-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |