CA2035192A1 - Gas leakage detector and controller for a smoke exhauster - Google Patents
Gas leakage detector and controller for a smoke exhausterInfo
- Publication number
- CA2035192A1 CA2035192A1 CA002035192A CA2035192A CA2035192A1 CA 2035192 A1 CA2035192 A1 CA 2035192A1 CA 002035192 A CA002035192 A CA 002035192A CA 2035192 A CA2035192 A CA 2035192A CA 2035192 A1 CA2035192 A1 CA 2035192A1
- Authority
- CA
- Canada
- Prior art keywords
- gas
- smoke exhauster
- control unit
- levels
- controller
- 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.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Ventilation (AREA)
Abstract
Abstract of the Disclosure A gas detector gas leakage and controller for a smoke exhauster comprising a gas sensor and control unit integrally housed under the hood of a conventional smoke exhauster. High concentrations of gas, of the type used for cooking and heating due to a gas leakage, is detected by the gas sensor and control unit which gives an aural warning through a buzzer and visual warning through indicator lights, both integrally mounted on the smoke exhauster. The fan motors of the smoke exhauster are automatically activated by the control unit to evacuate gas from the room and shuts off automatically shortly after gas levels have been reduced to safe levels as determined by the gas sensor and control unit.
Description
~3~
I'ATENT Ill'PI.lCATION OF
CIIIANG, Cha() Chc CIIIANGI Chi Sh,\/o CIIEN . Ch i Cherl For A GAS 1.13ARA(;R D13TECT()R ~lND CON'I'ROI.I.RI~ FOR A S~IOI(F IEXIlAllS'rRII
13ach~rountl of the Prest?nt Inventinn The present invelltion relales to a gas le.lltage detector :t'or a conventiona:l smohe exhauster of the -type llsed in a kitchen and more par-ticularly l;o n gas leakage (leteclor an(l 5 controller ror a smoke exhalls(.er thllt is integrally mo~ tetl and `: : controls the~lan ot)tors of the smolte exhtlustel enablin~ the ~:
smoke exhauster to not onlY signal the presellce o:F a ~as leak :~
; but also enable~ the smoke exhauster t.o expel the gas rrom the r oom. ~ : :
: :: :
: ~ : : : : :
~:~ 10 All;hough ~as dt,~tector~s, lor the~aspbyxl~tillg and explosive :
.
I'ATENT Ill'PI.lCATION OF
CIIIANG, Cha() Chc CIIIANGI Chi Sh,\/o CIIEN . Ch i Cherl For A GAS 1.13ARA(;R D13TECT()R ~lND CON'I'ROI.I.RI~ FOR A S~IOI(F IEXIlAllS'rRII
13ach~rountl of the Prest?nt Inventinn The present invelltion relales to a gas le.lltage detector :t'or a conventiona:l smohe exhauster of the -type llsed in a kitchen and more par-ticularly l;o n gas leakage (leteclor an(l 5 controller ror a smoke exhalls(.er thllt is integrally mo~ tetl and `: : controls the~lan ot)tors of the smolte exhtlustel enablin~ the ~:
smoke exhauster to not onlY signal the presellce o:F a ~as leak :~
; but also enable~ the smoke exhauster t.o expel the gas rrom the r oom. ~ : :
: :: :
: ~ : : : : :
~:~ 10 All;hough ~as dt,~tector~s, lor the~aspbyxl~tillg and explosive :
.
2 ~ 2 gnses commonly use(l rOI~ cookirlg iln(l he;ltirlg, Witil illldil)le nlarms hnve l)e(ll l)rovide(l in l.he ~ t. lhc g(lS le(lll(lge del.(( l.o and conlroller ror a sm()ke e.Yll(lll.sl:er oF l.lle 1)1'(!~(!111 i.llvl~ntio is inte~rcllly mo~lnte(l withirl l.lle smoke exllilllsler.
(.`,YIlllllSl;l!l` I;t) l?,Y~ . t ll(` l~llS~ (lln tll(~ 1'0(1111 ~ d slllll;ti 1).1 1 nlltomnli.(:all~v al'ter l;lle level Or n(1xio~ls gns(!s lltls r(ll(lle(l (;nre levels~
TlliS iS ;l ].lli`g(? improvelllelll; over a simple w(lrnill~ detertnr n9 it prov.i(les the fullctlon Or atllollllltic nn(l lar~ih yns expulsioll witllollt t.he nee(l of mn(lnl inlervellti()ll. In I.llc ~ sell(:~ ()r ~Ill,y ~)(lg(~llll(!l irl l.lle vi(;llil.,Y, ~ ls l(-~dete(,tor woul(l I)e of littlc~ use, allnwillg tlle accllmlllntioll nf eas.ily ignitc(l e,YI)l()sive ~nses, mhr~y Or l;he Present Invelll:i.oll The gas leakage arl(l cnlll;roller for n smoke exllllaster llas as a :rirst ob.iective t.o Flrov;(le n ~as leakage detector witll audible and visible indicators Oe dallgerolls gas levels that is integrally mollnte(l w~;thin a sln()ke exhauster and a second objective to provide a gas leaha,~e detector that can coll-tIol ~tlle earl mo-tors of the snlohe exhallsl:eI ellabliri~ it to expel .
IlOXiOllS ~aSeS~.er()m the rOOlli~ ~ .
: The gas leakage de-tector and controller l`or a smoke exhallster oiF the present inverltioll coDiprises a gas sensor ar :: :
control unit mounted under the hood Df a smoke exhnllster, an :
- 2-- :
. : , :
2 ~ s~
electrical buzzer for audible warning of a gas leakl a r~air Or indicator lights for visual verif:icatioll! an(l arl ol.)tiorrcll set of lights for a more salient v.isib:~e warning.
The electrnnic circllits witll.ill lhe contl~ol unil contairls a ~letector ~ Itil:i%(3~; ~ Siltll~l t`l~OI~ s ~i~3~ ;C
tlle COllCelll:lnlti.()ll Or (lallg(?l`()llS ~nS(`9. OIICC n dallger()us tllrofill()l(l i.x del(3(:r.e(1, a~ .%el~ ;s a(:t:i.vnl;e(l by l;hc colll:.rol llt .i9 1;~ rl, orl tll(~ flolll; p(~ll(?l ()t` 1;
Hmoho e,Yllall~il.rr. 'I`hus, the rirsl ob,iecl;iv(? of l;he pr(ns(!rll.
:10 :i.nventioll is acllleve(l.
In ad(liti()ll, tllc contr()l un3.t activates the rnn mot()rs oî
the smok(3 exllauster to cxpel noxi.olls gases :from the room an(l shllts tlleln Or:r wherl sare levels aLe on(:e agaill attaill(!(l. 'I`he secon(l object;ive ol the present invelltiorl is thereby acllieve(l.
lt; ~n optional set o:E warllirlg li~hts cons.i.sts Or n line Or liglit.fi which are scnnlle(l se(luelltlall<Y to giV(? a very visib:le an(l at-tellti()ll gettin~ alert Sigll. Tlle details o.f the functioll all(l operation ol! the control unit are described in tlle pr(!~`erre(l embo(linlellt below.
20 Description Or the Drawings Flg. I is a partly cu-t-away view o.f an embo(limerlt o.~ the gas ~: 1 eai~age detector and controller of the prese(lt~
invention mounted on n conventiollal smoke exh~uster.
Fig. 2 is a functional block diagram o:~ the major electrical 25~ ~ sub-circuits~ used in tbe gas leai~age detector and controller of ~the presellt inven-tiori.
~3~
~:
' ': " '' ' '' ' . , ,:
Fig. 3 is sln clectrica:l Cil`CII; l (liagr;lm Or Sln emlJO(Iimll('l, ot' the control circuit. IlSe(l in Ihe gas leaklge (I(l;e(lor an(l controller o:F t.hc l~resenl. invclll;io Preferre(l Ellll)o(lilllcllt of tile l'rescnl; Invellli 6 Rer~ t(~ . l s~ (,()lI~'(`illitlll~ll Slll()l~r` t'~ lll'it,(.`l' showll wi.tll tlle gns leslka~e delectt)l~ nlltl(:olll;roll(!l o~ l;h reselll .invelll.it)lllllt)lllll(;(l on its nll(lersi(le~ whe~ it is vi~ibl(l in thQ cul-slwlly lert sidt!. Tlle lwo covers ll antl 1~ eslctl IIOII~C
sl fsln motor one o.E wll:ich is v.isible in tlle le.rl; clll-slwa~Y vi.eli.
The duct caYity 12 is where nlr is sucke(l ;n by the .Fan. Tlle gas leaklge detectol itself is hollse(l ~ithillslrl oii ri.lter 15 wllicll protecls th( sensor from conts~ in(ltiorl. The contlol cir(,U.it,ry ;.9 llouse(l w:ithirl an en(l.osllle l~ f`rnnl wshicl electrical collllectioll~s extell(l to lhe lelkal-e detectol sultl SII
to t~io ind.Lc;.ltor l.igllts lG sln(l 17~ exl;erllally Inollnte(l sllld visible on the r:igllt srontsll v.iew. The in(li.cntor lil-hl;; l~i alld :17 are ror in(licslting l;he ~-Jresellce or s~bsence o~ sl gSIS lenk.
The functionillg o.F the ~SIS leakage and controller o~ the present invention is be~t ImdersLoo(l by referriTIg to ~ig. 2.
The ~s~jority of electrical components are hou6ed in the enclusure 14~ and can best be viewed as six fllnctional blocks sls'dep;cte(l in tlle dia~ram.
: The first block represen~Ls the power supply which recieves ~ AC line voltage and rectif.ies lt and usi.ng a voltage regulator : 25 IC delivers a voltage:regulate(l ~12 volts to the circuitrY in the rémaining blocks.
: :
-,, .
.; : .. : . , , . ': - .... . .. . ,' : ` . : - :
.' : ." ' ` .' ' :
., . . . .. : ....... .
.. . . ~ , .
2 ~
The seco~ r1clionilL bl()ck in(l11(1es 1,11e gas SCllS()t' itsell' whic11 as nlentioned al)ove is 1~ 1se11 se1~at~iltel.Y fro1n the n1air circuit, wil,1lin the oil i'ilter 1~.
T1le sensi1,ivity ol` the inls sens()l is ad,il1s1.e(1 1~ n(iln~i of r~ il l1()1,cn1~ i(illl(? ll(!r s() ilS t.o il l lOW S(!I(!C~ i t~ oI 1.11(! 1.1`i!'¦~Cl`ill~
~il9 ioV(! 1.
rlle t)lll,~ .ll(! g;l'; ';(!11';01' iS S(`lll. I.o 1.11(! I.llil`( runctin~ 1 1)10(:1( whic1) co~tnims a11 opeli1tior1al am1-lirir~ base(1 comp~ l.or l.hal (lel.elnlit)es ll)e presellce Or di~ lol)s gilS
lO 1evels. Tl1is s-tatus is sl1owr1 by the ab()ve mentione(1 in(1icator lights whi(:}l use LEO's under its control.
This F11nctio~ l blc~c1~, 11owev~r is initially cu1ltlollc~1 b~
the t'ourth functio11al block whi(~11 intro(1uces a lime delaY aeter whicl1 lhe lhir(1 l'unct;o~ l l)lock can opera1;e activel~. T11is is 15 recluire(l after ench timc -the syslen1 is activnted as 1;he semi-('orl(ll~(:l.OI' ~tilS 9cllsnr ~ tli.l~l~s i~ lrln-llr~ ti.ln(! I)('r:io(l t)el'ol~e lt can glve stable vall1es. It utlli;~.es a11 operi1tiol1al amplifler with one o~ lts inr~uts RC couple(1 so ilS lo intro(lnces n tlme consla1lt.
When~ the signal erom the gns sensor indicates da1lgero1ls ~; levels of ;gas, the thir~ F~ ctio11al block slg~ ]s~ a flr1h ~functional~block to ac~tivate the fan motols of the smoke exhauster~t11rou~h a relaY. A (IPlsy circult, nlso os1ng ln operational amplii'ier with an RC coi1pled input, withlIi this block serves to mllintain power~ lo ti~e fan motors at`ter tlte gas ' sesnsor and third f'unctional bloch delecls saïe gns levels arid : ~: :
.
. .,: . , - ., . - .. , . . . . ~ - .
, .,.,~ ~' ' ' - , ' , ' ' ' ., . ~ , .
Sill~ S llle I i I tll ru"(: t~ ()clt l o !; t()p . I I) i .S ; S to flSSlll'e lll(ll. tbe Slll()l(e eXIlallSt(!l' I`(!l)lnillS ()11 1()l~ erl()lll~ll 1() (`Xn('l any remaining noxiolls gases not conc(?lllr.lte(l in the imme(li.ltc Vi(:irlily ()f ttlC ~ns sensor.
The SiXI.ll rUn(:l;:iOIln~ ()('11 COllt.;l.ill~; a I):iC7.() I)l1Z;'.(?I` fOI` illl all(lil)lo wnmlillg nll(l corll,r()ls all ()I:~li()lnll .lill(! ol` (`iglll~ `.l)'s m()llllle(l oll I.lle rr()~ "lnel nr tl~(` Slll()h(! eXIlall91;(`1`~ Tlli9 r~lll(:tioll~ )cl~ i~ colltrolle(l lly tlle rirt.ll r""(l;i("~ bl()clt nn(l llses CMOS i.nverl;ors confi~ln~e(l as ()9(:iilat()r~s l;n (Irive th(`
1() piezo hnzzer an(l .1 TTL comhinc(l colllller/(le(:o(lel IC wllicll sequellti.lll,y alld c,vclically (Irives the opt:ional l:ine Or eight LED ' s .
A complele elec-trollic circl1it diaKrnm is given ill Fi~. 3 .
and will be apparerll. to anyone sl(ill(?(l in the nl~t tb.lt tlle 15 aforelnentione(l fullcti()n can be attnine(l hy sucll a c()llt.rol circui t .
.
:: : : : : :
' ' .'' ' ~' '' ' , ~" ~''' ' -. : ' '"
,, ' - , ~ ..... ' , .
:.
(.`,YIlllllSl;l!l` I;t) l?,Y~ . t ll(` l~llS~ (lln tll(~ 1'0(1111 ~ d slllll;ti 1).1 1 nlltomnli.(:all~v al'ter l;lle level Or n(1xio~ls gns(!s lltls r(ll(lle(l (;nre levels~
TlliS iS ;l ].lli`g(? improvelllelll; over a simple w(lrnill~ detertnr n9 it prov.i(les the fullctlon Or atllollllltic nn(l lar~ih yns expulsioll witllollt t.he nee(l of mn(lnl inlervellti()ll. In I.llc ~ sell(:~ ()r ~Ill,y ~)(lg(~llll(!l irl l.lle vi(;llil.,Y, ~ ls l(-~dete(,tor woul(l I)e of littlc~ use, allnwillg tlle accllmlllntioll nf eas.ily ignitc(l e,YI)l()sive ~nses, mhr~y Or l;he Present Invelll:i.oll The gas leakage arl(l cnlll;roller for n smoke exllllaster llas as a :rirst ob.iective t.o Flrov;(le n ~as leakage detector witll audible and visible indicators Oe dallgerolls gas levels that is integrally mollnte(l w~;thin a sln()ke exhauster and a second objective to provide a gas leaha,~e detector that can coll-tIol ~tlle earl mo-tors of the snlohe exhallsl:eI ellabliri~ it to expel .
IlOXiOllS ~aSeS~.er()m the rOOlli~ ~ .
: The gas leakage de-tector and controller l`or a smoke exhallster oiF the present inverltioll coDiprises a gas sensor ar :: :
control unit mounted under the hood Df a smoke exhnllster, an :
- 2-- :
. : , :
2 ~ s~
electrical buzzer for audible warning of a gas leakl a r~air Or indicator lights for visual verif:icatioll! an(l arl ol.)tiorrcll set of lights for a more salient v.isib:~e warning.
The electrnnic circllits witll.ill lhe contl~ol unil contairls a ~letector ~ Itil:i%(3~; ~ Siltll~l t`l~OI~ s ~i~3~ ;C
tlle COllCelll:lnlti.()ll Or (lallg(?l`()llS ~nS(`9. OIICC n dallger()us tllrofill()l(l i.x del(3(:r.e(1, a~ .%el~ ;s a(:t:i.vnl;e(l by l;hc colll:.rol llt .i9 1;~ rl, orl tll(~ flolll; p(~ll(?l ()t` 1;
Hmoho e,Yllall~il.rr. 'I`hus, the rirsl ob,iecl;iv(? of l;he pr(ns(!rll.
:10 :i.nventioll is acllleve(l.
In ad(liti()ll, tllc contr()l un3.t activates the rnn mot()rs oî
the smok(3 exllauster to cxpel noxi.olls gases :from the room an(l shllts tlleln Or:r wherl sare levels aLe on(:e agaill attaill(!(l. 'I`he secon(l object;ive ol the present invelltiorl is thereby acllieve(l.
lt; ~n optional set o:E warllirlg li~hts cons.i.sts Or n line Or liglit.fi which are scnnlle(l se(luelltlall<Y to giV(? a very visib:le an(l at-tellti()ll gettin~ alert Sigll. Tlle details o.f the functioll all(l operation ol! the control unit are described in tlle pr(!~`erre(l embo(linlellt below.
20 Description Or the Drawings Flg. I is a partly cu-t-away view o.f an embo(limerlt o.~ the gas ~: 1 eai~age detector and controller of the prese(lt~
invention mounted on n conventiollal smoke exh~uster.
Fig. 2 is a functional block diagram o:~ the major electrical 25~ ~ sub-circuits~ used in tbe gas leai~age detector and controller of ~the presellt inven-tiori.
~3~
~:
' ': " '' ' '' ' . , ,:
Fig. 3 is sln clectrica:l Cil`CII; l (liagr;lm Or Sln emlJO(Iimll('l, ot' the control circuit. IlSe(l in Ihe gas leaklge (I(l;e(lor an(l controller o:F t.hc l~resenl. invclll;io Preferre(l Ellll)o(lilllcllt of tile l'rescnl; Invellli 6 Rer~ t(~ . l s~ (,()lI~'(`illitlll~ll Slll()l~r` t'~ lll'it,(.`l' showll wi.tll tlle gns leslka~e delectt)l~ nlltl(:olll;roll(!l o~ l;h reselll .invelll.it)lllllt)lllll(;(l on its nll(lersi(le~ whe~ it is vi~ibl(l in thQ cul-slwlly lert sidt!. Tlle lwo covers ll antl 1~ eslctl IIOII~C
sl fsln motor one o.E wll:ich is v.isible in tlle le.rl; clll-slwa~Y vi.eli.
The duct caYity 12 is where nlr is sucke(l ;n by the .Fan. Tlle gas leaklge detectol itself is hollse(l ~ithillslrl oii ri.lter 15 wllicll protecls th( sensor from conts~ in(ltiorl. The contlol cir(,U.it,ry ;.9 llouse(l w:ithirl an en(l.osllle l~ f`rnnl wshicl electrical collllectioll~s extell(l to lhe lelkal-e detectol sultl SII
to t~io ind.Lc;.ltor l.igllts lG sln(l 17~ exl;erllally Inollnte(l sllld visible on the r:igllt srontsll v.iew. The in(li.cntor lil-hl;; l~i alld :17 are ror in(licslting l;he ~-Jresellce or s~bsence o~ sl gSIS lenk.
The functionillg o.F the ~SIS leakage and controller o~ the present invention is be~t ImdersLoo(l by referriTIg to ~ig. 2.
The ~s~jority of electrical components are hou6ed in the enclusure 14~ and can best be viewed as six fllnctional blocks sls'dep;cte(l in tlle dia~ram.
: The first block represen~Ls the power supply which recieves ~ AC line voltage and rectif.ies lt and usi.ng a voltage regulator : 25 IC delivers a voltage:regulate(l ~12 volts to the circuitrY in the rémaining blocks.
: :
-,, .
.; : .. : . , , . ': - .... . .. . ,' : ` . : - :
.' : ." ' ` .' ' :
., . . . .. : ....... .
.. . . ~ , .
2 ~
The seco~ r1clionilL bl()ck in(l11(1es 1,11e gas SCllS()t' itsell' whic11 as nlentioned al)ove is 1~ 1se11 se1~at~iltel.Y fro1n the n1air circuit, wil,1lin the oil i'ilter 1~.
T1le sensi1,ivity ol` the inls sens()l is ad,il1s1.e(1 1~ n(iln~i of r~ il l1()1,cn1~ i(illl(? ll(!r s() ilS t.o il l lOW S(!I(!C~ i t~ oI 1.11(! 1.1`i!'¦~Cl`ill~
~il9 ioV(! 1.
rlle t)lll,~ .ll(! g;l'; ';(!11';01' iS S(`lll. I.o 1.11(! I.llil`( runctin~ 1 1)10(:1( whic1) co~tnims a11 opeli1tior1al am1-lirir~ base(1 comp~ l.or l.hal (lel.elnlit)es ll)e presellce Or di~ lol)s gilS
lO 1evels. Tl1is s-tatus is sl1owr1 by the ab()ve mentione(1 in(1icator lights whi(:}l use LEO's under its control.
This F11nctio~ l blc~c1~, 11owev~r is initially cu1ltlollc~1 b~
the t'ourth functio11al block whi(~11 intro(1uces a lime delaY aeter whicl1 lhe lhir(1 l'unct;o~ l l)lock can opera1;e activel~. T11is is 15 recluire(l after ench timc -the syslen1 is activnted as 1;he semi-('orl(ll~(:l.OI' ~tilS 9cllsnr ~ tli.l~l~s i~ lrln-llr~ ti.ln(! I)('r:io(l t)el'ol~e lt can glve stable vall1es. It utlli;~.es a11 operi1tiol1al amplifler with one o~ lts inr~uts RC couple(1 so ilS lo intro(lnces n tlme consla1lt.
When~ the signal erom the gns sensor indicates da1lgero1ls ~; levels of ;gas, the thir~ F~ ctio11al block slg~ ]s~ a flr1h ~functional~block to ac~tivate the fan motols of the smoke exhauster~t11rou~h a relaY. A (IPlsy circult, nlso os1ng ln operational amplii'ier with an RC coi1pled input, withlIi this block serves to mllintain power~ lo ti~e fan motors at`ter tlte gas ' sesnsor and third f'unctional bloch delecls saïe gns levels arid : ~: :
.
. .,: . , - ., . - .. , . . . . ~ - .
, .,.,~ ~' ' ' - , ' , ' ' ' ., . ~ , .
Sill~ S llle I i I tll ru"(: t~ ()clt l o !; t()p . I I) i .S ; S to flSSlll'e lll(ll. tbe Slll()l(e eXIlallSt(!l' I`(!l)lnillS ()11 1()l~ erl()lll~ll 1() (`Xn('l any remaining noxiolls gases not conc(?lllr.lte(l in the imme(li.ltc Vi(:irlily ()f ttlC ~ns sensor.
The SiXI.ll rUn(:l;:iOIln~ ()('11 COllt.;l.ill~; a I):iC7.() I)l1Z;'.(?I` fOI` illl all(lil)lo wnmlillg nll(l corll,r()ls all ()I:~li()lnll .lill(! ol` (`iglll~ `.l)'s m()llllle(l oll I.lle rr()~ "lnel nr tl~(` Slll()h(! eXIlall91;(`1`~ Tlli9 r~lll(:tioll~ )cl~ i~ colltrolle(l lly tlle rirt.ll r""(l;i("~ bl()clt nn(l llses CMOS i.nverl;ors confi~ln~e(l as ()9(:iilat()r~s l;n (Irive th(`
1() piezo hnzzer an(l .1 TTL comhinc(l colllller/(le(:o(lel IC wllicll sequellti.lll,y alld c,vclically (Irives the opt:ional l:ine Or eight LED ' s .
A complele elec-trollic circl1it diaKrnm is given ill Fi~. 3 .
and will be apparerll. to anyone sl(ill(?(l in the nl~t tb.lt tlle 15 aforelnentione(l fullcti()n can be attnine(l hy sucll a c()llt.rol circui t .
.
:: : : : : :
' ' .'' ' ~' '' ' , ~" ~''' ' -. : ' '"
,, ' - , ~ ..... ' , .
:.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1) A gas leakage detector and controller for a smoke exhauster comprising a smoke exhauster, an integrally mounted control unit, a gas sensor disposed under the hood of said smoke exhauster, a buzzer and at least one indicator light disposed on the front of the hood of said smoke exhauster, wherein:
a detection circuit in said control unit determines the presense of dangerous gas levels based on a signal from said gas sensor;
the fan motors of said smoke exhauster are automatically activated by circuits in said control unit when said detection circuit determines the presence of dangerous gas levels and automatically shut off when safe levels of gas are attained;
said buzzer is also activated by circuits in the control unit to give an audible warning when said detection circuit determines the presence of dangerous gas levels, and concomitantly said one or more indicator lights are activated to give a visual warning.
a detection circuit in said control unit determines the presense of dangerous gas levels based on a signal from said gas sensor;
the fan motors of said smoke exhauster are automatically activated by circuits in said control unit when said detection circuit determines the presence of dangerous gas levels and automatically shut off when safe levels of gas are attained;
said buzzer is also activated by circuits in the control unit to give an audible warning when said detection circuit determines the presence of dangerous gas levels, and concomitantly said one or more indicator lights are activated to give a visual warning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002035192A CA2035192A1 (en) | 1991-01-29 | 1991-01-29 | Gas leakage detector and controller for a smoke exhauster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002035192A CA2035192A1 (en) | 1991-01-29 | 1991-01-29 | Gas leakage detector and controller for a smoke exhauster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035192A1 true CA2035192A1 (en) | 1992-07-30 |
Family
ID=28048216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002035192A Abandoned CA2035192A1 (en) | 1991-01-29 | 1991-01-29 | Gas leakage detector and controller for a smoke exhauster |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2035192A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA008552B1 (en) * | 2005-12-29 | 2007-06-29 | Владимир Александрович Циммерман | Air cleaning system in indoor premises |
| CN114419850A (en) * | 2021-12-28 | 2022-04-29 | 赛维斯特工业安全科技(江苏)有限公司 | Double-layer outdoor dangerous chemical temporary storage cabinet |
-
1991
- 1991-01-29 CA CA002035192A patent/CA2035192A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA008552B1 (en) * | 2005-12-29 | 2007-06-29 | Владимир Александрович Циммерман | Air cleaning system in indoor premises |
| CN114419850A (en) * | 2021-12-28 | 2022-04-29 | 赛维斯特工业安全科技(江苏)有限公司 | Double-layer outdoor dangerous chemical temporary storage cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980129 |