GB1433172A – Alarm systems
– Google Patents
GB1433172A – Alarm systems
– Google Patents
Alarm systems
Info
Publication number
GB1433172A
GB1433172A
GB1791873A
GB1791873A
GB1433172A
GB 1433172 A
GB1433172 A
GB 1433172A
GB 1791873 A
GB1791873 A
GB 1791873A
GB 1791873 A
GB1791873 A
GB 1791873A
GB 1433172 A
GB1433172 A
GB 1433172A
Authority
GB
United Kingdom
Prior art keywords
transistor
alarm
strip
resistance
capacitor
Prior art date
1972-04-13
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.)
Expired
Application number
GB1791873A
Inventor
S T J Lofgren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IMPULS REGULATOR I LYCKSELE AB
Original Assignee
IMPULS REGULATOR I LYCKSELE AB
Priority date (The priority date 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 date listed.)
1972-04-13
Filing date
1973-04-13
Publication date
1976-04-22
1973-04-13
Application filed by IMPULS REGULATOR I LYCKSELE AB
filed
Critical
IMPULS REGULATOR I LYCKSELE AB
1976-04-22
Publication of GB1433172A
publication
Critical
patent/GB1433172A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G08—SIGNALLING
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B13/00—Burglar, theft or intruder alarms
G08B13/22—Electrical actuation
G—PHYSICS
G01—MEASURING; TESTING
G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
G01M3/00—Investigating fluid-tightness of structures
G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
G—PHYSICS
G08—SIGNALLING
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B17/00—Fire alarms; Alarms responsive to explosion
G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
Abstract
1433172 Detecting moisture electrically IMPULS REGULATOR I LYCKSELE AB 13 April 1973 [13 April 1972] 17918/73 Heading G1N A moisture detector and alarm system includes a moisture detecting strip 5 having conductors 6, 7 corrected by a resistance 8 and operative to provide a signal to a threshold detector in an alarm condition detecting circuit 111 which provides an actuating signal to an alarm signalling circuit I when the signal from the strip exceeds a threshold value, there being provided testing means operative periodically to lower the predetermined threshold value below the normal value of the signal from the strip 5 in a non-alarm state. The threshold detector is constituted by a trigger circuit made up of transistors Ti, T 2 which receives periodically a test pulse from the collector of T12 via resistance R6, due to capacitor C7 charging via resistance R21 until transistor T13 triggers to discharge this capacitor and provide the test pulse from T12. The capacitor then re-charges and so on. Provided current is passing through strip 5 and terminal resistance 8 (i.e. strip is unbroken), the trigger circuit produces in response to the test pulse a voltage, via transistor T3 and diode D1, to energize the multi-vibrator T6, T7. This voltage also passes to RC circuit C1, R9 and produces a pulse to enable transistor T4 which acts via transistor T6 to block transistor T8 so that the alarm bell K is held inoperative, and which acts via capacitor C3 to block transistor T7 which blocks transistor T9 so that the alarm lamp L1 is held inoperative. Strip fault indication., Should there be a break in the strip 5 or resistance 8, the trigger circuit will not be triggered so that resistance R7 will not receive current from transistor T3. Consequently thyristor T10 receives no signal at its gate and having been switched off by the test pulse via capacitor C6 cannot be reenergized. Thus current from resistance R19 passes to the base of transistor T11 and the faultindicating lamp L2 is illuminated. Alarm indication. Presence of water on strip 5 triggers the appropriate alarm condition detecting section III, there being a plurality of such sections, to cause energization, as described above, of the multi-vibrator T6, T7. (Since T4 is able to block it only for the duration of a test pulse.) Thus the bell K and lamp L1 will be activated by alternate pulses from the multi-vibrator. A push button TK allows thyristor T5 to block transistor T8 via T6 to disable the bell whereas the transistor T7 is enabled to illumi- nate lamp L1 continuously via T9. Plural alarm indications. If another section III is triggered after button TK is pressed, a pulse is received from the respective capacitor C1 and diode D2 whereby T5 in section I is blocked so the multi-vibrator T6, T7 is re-started to give an alarm indication as before.
GB1791873A
1972-04-13
1973-04-13
Alarm systems
Expired
GB1433172A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
SE7204814A
SE375395B
(en)
1972-04-13
1972-04-13
Publications (1)
Publication Number
Publication Date
GB1433172A
true
GB1433172A
(en)
1976-04-22
Family
ID=20265034
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1791873A
Expired
GB1433172A
(en)
1972-04-13
1973-04-13
Alarm systems
Country Status (5)
Country
Link
US
(1)
US3882476A
(en)
DE
(1)
DE2318803C3
(en)
FR
(1)
FR2180085B1
(en)
GB
(1)
GB1433172A
(en)
SE
(1)
SE375395B
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2186722A
(en)
*
1986-02-17
1987-08-19
John Arthur Webb
Detecting leakage of liquid from machines
GB2360619A
(en)
*
1999-12-10
2001-09-26
Peter Terrance May
Water leak alarm
GB2384900A
(en)
*
2002-02-04
2003-08-06
George Robert Kirk
Device for warning of the presence of moisture
Families Citing this family (24)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4056815A
(en)
*
1976-02-03
1977-11-01
Westinghouse Electric Corporation
Battery operated transmitter circuit
US4110945A
(en)
*
1976-09-07
1978-09-05
The Dow Chemical Company
Roof installation for locating water leakage points
US4297686A
(en)
*
1979-10-01
1981-10-27
Tom M Dale
Water detection device
CA1168707A
(en)
*
1980-04-22
1984-06-05
Norscan Instruments Ltd.
Apparatus to monitor electrical cables, including splice joints and the like for the ingress of moisture
US4538141A
(en)
*
1982-10-04
1985-08-27
Chevron Research Company
Water detection subassembly and method of forming same, for computer processing centers
SE8404434D0
(en)
*
1984-09-05
1984-09-05
Nitto Scandinavia Ab
DEVICE FOR INDICATING WATER leaks in a pre-insulated pipeline
SE443928B
(en)
*
1984-09-06
1986-03-17
Klas Jakobsson
GAS-MEDIUM CLEANING FILTER
US4777473A
(en)
*
1986-08-22
1988-10-11
Fire Burglary Instruments, Inc.
Alarm system incorporating dynamic range testing
DK145087A
(en)
*
1987-03-20
1988-09-21
Renovadan System Transport A S
Traffic-barricading equipment
SE467023B
(en)
*
1989-03-20
1992-05-11
Bo Goesta Forsstroem
CONDUCTIVITY CELL AND WERE MANUFACTURED AND SUCH
US6175310B1
(en)
*
1999-05-10
2001-01-16
Richard J. Gott
Leak detection tape
US6587050B2
(en)
2001-07-24
2003-07-01
Eaton Corporation
Oscillator activated continuity testing switch
US6653846B2
(en)
2001-09-14
2003-11-25
Eaton Corporation
Multifunction circuit continuity and sensor tester
TWI235118B
(en)
*
2003-04-17
2005-07-01
Hi Touch Imaging Tech Co Ltd
Printer with detaching control device
CA2431657A1
(en)
*
2003-06-16
2004-12-16
Marc Therriault
Water shut off valve
US8380355B2
(en)
*
2007-03-19
2013-02-19
Wayne/Scott Fetzer Company
Capacitive sensor and method and apparatus for controlling a pump using same
US20110110792A1
(en)
*
2009-11-12
2011-05-12
Joseph Kendall Mauro
Sensors and methods and apparatus relating to same
US20110110794A1
(en)
*
2009-11-12
2011-05-12
Philip Mayleben
Sensors and methods and apparatus relating to same
US10711788B2
(en)
2015-12-17
2020-07-14
Wayne/Scott Fetzer Company
Integrated sump pump controller with status notifications
DE102016012908B3
(en)
*
2016-10-29
2017-08-17
SIM Grundstücksverwertungs-, Projektentwicklungs- und Hausbau GmbH
Device for reliable and timely notification of water damage
US11162496B2
(en)
2016-11-11
2021-11-02
Wayne/Scott Fetzer Company
Pump with external electrical components and related methods
USD893552S1
(en)
2017-06-21
2020-08-18
Wayne/Scott Fetzer Company
Pump components
USD890211S1
(en)
2018-01-11
2020-07-14
Wayne/Scott Fetzer Company
Pump components
CN108732077B
(en)
*
2018-05-31
2023-09-19
四川大学
Engine oil duct pipeline penetration detection method
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3699569A
(en)
*
1972-01-28
1972-10-17
Minnesota Mining & Mfg
Security system for indicating fire, intrusion or the like
1972
1972-04-13
SE
SE7204814A
patent/SE375395B/xx
unknown
1973
1973-04-11
US
US349989A
patent/US3882476A/en
not_active
Expired – Lifetime
1973-04-13
FR
FR7313474A
patent/FR2180085B1/fr
not_active
Expired
1973-04-13
GB
GB1791873A
patent/GB1433172A/en
not_active
Expired
1973-04-13
DE
DE2318803A
patent/DE2318803C3/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2186722A
(en)
*
1986-02-17
1987-08-19
John Arthur Webb
Detecting leakage of liquid from machines
GB2360619A
(en)
*
1999-12-10
2001-09-26
Peter Terrance May
Water leak alarm
GB2384900A
(en)
*
2002-02-04
2003-08-06
George Robert Kirk
Device for warning of the presence of moisture
Also Published As
Publication number
Publication date
DE2318803A1
(en)
1973-10-18
DE2318803C3
(en)
1975-11-06
SE375395B
(en)
1975-04-14
DE2318803B2
(en)
1975-03-27
US3882476A
(en)
1975-05-06
FR2180085A1
(en)
1973-11-23
FR2180085B1
(en)
1977-02-04
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Legal Events
Date
Code
Title
Description
1976-09-02
PS
Patent sealed [section 19, patents act 1949]
1977-11-02
PLE
Entries relating assignments, transmissions, licences in the register of patents
1983-11-30
PCNP
Patent ceased through non-payment of renewal fee
