DE2050719C - Fire alarm system - Google Patents

Description

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lamp with another one. W.

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^ SENSORS OF THE FIRE MEASURES OF THE INVENTION ^ Jf ₁ "hai" der --—

day one

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Fiuermeld.adl.ge, welcbe eme checked, ^ _lossene

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ricnisMn ^ biSonderc, the NoTOendigkenoner aiiv expensive Zener diode should be avoided, rather «. SNEN instead bi "i ₈ ere components benu" advertising

^de ? S7

" _E S, _{r0 <} ta II and 12 and emer 23; both lonMtionskammera the connections 1 ™ ^d3 g:

in a fire alarm system control electrode C «t

_u "d 20

em'eÄÄd

s ³ °

fen partial resistance of the voltage divider with

connected to a power line.

In contrast to the known circuit, will In the circuit according to the invention, the silicon rectifier connected to a PoTdes in each case Potential is not sensed with the help of a relatively expensive Zener diode, but it is Voltage divider consisting of two resistors in connection with emer normal toe be

pÄ ST i ^ S ^{1 e} SrÄten SSerstand if the controlled silicon rectifier of a fire alarm does not ignite, the voltage dropping is then displayed on the instrument of the central unit, which means that no response Bern '

_Connection 3 laid.

übenvachungsbetneb the year _{the Ansch} lüsse2 and 3 to each other _a predetermined voltage is ^ Su "se applied 1 and 2, since em _Ionisa tion lonisa- current through the two ¹ ^ J ¹¹ _{0 2} 0 _nd flows. If smoke penetrates the ^ 20 em, then the po-

Who _ d «

_{s increases} accordingly

g is the zener tension of _the

_5S

other resistance, on the other hand, serves to reduce of the current flowing through the indicator lamp which are only then made to light up should, if the parallel to ^^^^

Äef

rs ^ _ß estaltung out the invention con- "s, the two partial resistances of the voltage divider

SÄ3 ÄSi £ Sl Ä ^ Ä 100 200 ^ - J | _{shown in detail} ,

only the ™ ^do _smoke sensors in block form while the others ^^ _{the guide}

ϊθθ ₂ ά "Td 300 are connected to a central device, ^ ^ ^

a ₅ ^^^ emen g

Voltage source connected

the negative connection of the voltage source 18 avoid premature operation of several smoke sensors

closed, and the third conductor 300 is left on.

moving contact of a single-pole four-way switch Should the smoke detector be checked by

31 connected, the fixed contacts 31-1, 31-2, the state of smoke penetration into some 31-3 and 31-4 has. The fixed contact 31-1 is mimicked across 5 of them, then the switch a resistor 16 with the second conductor 200 connected 31 to its fourth contact 31-4, so that bound, the fixed contact 31-2 is directly connected to a high positive voltage corresponding to the beden second conductor 200 and the fixed operating voltage is given to the conductor 300. Da-contacts 31-3 and 31-4 have two taps by increasing the voltage across the open the voltage source 18 connected. This tapping ionization chamber 20 and thus the voltage increases genes are chosen so that the third conductor 300 in at the connection point 7 and the control electrode G the position of the switch 31 on the third conduction of the field effect transistor 4. Everyone behaves clock 31-3 a low positive voltage is fed to the smoke sensor so as if smoke is entering its open ionisa, corresponding to a voltage value at which the chamber 20 would have penetrated and its safety should not respond to the fire alarm system. If 15 zium rectifier 6 is in the conduction state geder switch 31 on its contact 31-4, it receives controls.

the third conductor 300 has a high positive voltage. In this state, the display of the corresponding to a value at which the smoke sensor volt-meters 19 read whether all smoke alarms should respond. th or not. In particular, after a certain time between the two connections of the span, the switch 31 is switched to its first coning source 18, a relay 34 is put back in series with a clock pulse 31-1. If one of the smoke self-holding contacts 34-1 and a reset switch sensor does not work, then the volt meter 19 shows

32 switched. The relay 34 is a working voltage, which by voltage division contact 33-1 of the relay 33 switched on, which between the resistor 14 in the smoke sensor and lies parallel to the holding contact 34-1, via which aj the resistor 16 in the central device 40 is determined the relay 34 then remains energized. The relay 34 and half the emitter voltage represents The also has a working contact 34-2 to the short-term non-working smoke sensor can be determined with the help of the relay 33 and a working contact ner control lamp 5.

34-3 to switch on the alarm device 17. Between- If the volt meter 19 shows zero volts, then need see the conductors 200 and 300 is a volt meter 19 30 the smoke sensor is not looked up to graze because switched. Resistance 16 will be the same as this display means that all are working. Resistance 14 in the smoke sensors 101, 102, etc. There is still the option of non-radio selected. tioning a smoke sensor for the case to be checked - In the normal monitoring state, the fen is that only little smoke penetrates In this case Switching arm of the switch 31 on the second contact 35, the switch 31 is on the third contact 31-3 31-2 so that conductors 200 and 300 are laid together so that a low positive voltage is released. When smoke penetrates into one of the smoke sensors speaking a preselected voltage on the cord, so that the controlled silicon rectifier 300 arrives. As a result, the Steuerelektroter6 comes to conduct, then the lamp 5 lights the voltage of the field effect transistor 4 in each on, and the increased load current brings the relay 40 smoke sensor only slightly increased

33 to respond, so that its contact 33-1 degree of voltage increase should be closed. As a result, the relay 34 to the contact steamer silicon rectifier 6 does not ignite chen and closes its contacts 34-1, 34-2 and become. If one of the smoke sensors is faulty 34-3 so that the alarm is given. Since the relay is working, an alarm is triggered that

34 holds himself through his contact 34-1, gives the 45 know.

Alarm device 17 as long as the alarm, even if the fire alarm system described above Smoke sensors back to their normal state can be maintained very comfortably and economically

is reversed until the reset switch 32 is pressed and check that an operational test of each smoke detector

and the relay 34 fills up again. The contact is very easy to follow from the central device

34-2 is used to short-circuit the relay 33 so that 50 can without affecting the reporting function.

an excessive voltage drop would be equalized.

1 sheet of drawings

Claims (4)

from the field effect transistor (4) controlled silicon patent claims: contains converter (6) with a display element (5). 1. Fire alarm system with several smoke sensors, each one open and one closed 5 Ionization chamber connected in series as well one connected in parallel and with her
Control input at the connection point of the two Ionization chambers connected trigger- The invention relates to a fire alarm system with Tidiness and the one with a central area several smoke sensors, one open and one advises using two ionization chambers connected in series with the operating voltage supplied to them power lines as well as a test line and one connected in parallel and with your which are connected in the smoke sensors via control input to the connection point of the two Ionieine Diode and a resistor with a trigger arrangement connected in the sationskammern triggered state voltage-carrying switch- 15 included and the one with a central device via two connected to the trigger arrangement is the power line supplying the operating voltage and which are connected in the normal monitoring state and a test line which is in in the central device to the one power line connected to the smoke sensor via a diode and a closed circuit is, for test purposes, on the other hand, with a stand with a voltage in the triggered state voltage-carrying circuit point of the trigger arrangement lying below the operating voltage voltage can be acted upon, and with which is connected to test and which in normal monitoring purposes Furthermore, the connection state in the central device connected to the one power line Ionization chambers facing away from the electrode device is connected, for test purposes, however, with of the one ionization chamber one of the one lying below the operating voltage paint operating voltage deviating and the 25 voltage can be acted upon, and where to test smoke sensor clamping purposes that can be used to respond can also be fed to the connection point of the two openings and an electrode facing away from the ionization chamber in the central device with one of the power lines connected measuring an ionization chamber one of the normal leg instruments to check the response of the operating voltage and the smoke sensor Smoke sensor is provided during the test, so that a voltage that can be triggered can be supplied characterized in that the the and wherein in the central device one with one of the current test line (3) Measuring instrument connected to the switching point (lines for checking purposes) connection point of display element 5 and controlled response of the smoke sensor during the test ertem silicon rectifier 6) the trigger arrangement is provided. tion (4,5,6) connecting resistance a first 35 In a known fire alarm system (German Partial resistance (14) of a voltage divider Auslegeschrift 1183 838) is via the series circuit (14, 16) is and that the test line (3) also device of the two ionization chambers one with the help in the smoke sensors (101 to 104) a gas discharge tube that can be controlled by a grid (22) of the one ionization chamber (20) which, when smoke is introduced into the open is bound and ignited in the central unit (40) in the normal 40 ionization chamber. For checking Immediate monitoring status, the open ionisaks are used for testing purposes of the individual smoke detectors on the other hand, provided with a test grid via the voltage display device, to which (19) trained measuring instrument and a chcs on a test lead to connect a test voltage Partial resistance (16) of the voltage divider can be placed. Thereby the potential differences (14,16) with one power line (2) the conditions in the open ionization chamber changed is. changes so that their impedance changes in a way 2. Fire alarm system according to claim 1, da- dert, which corresponds to the penetration of smoke, characterized in that the two partial resistance When the test voltage is applied, the smoke detectors must (14,16) of the voltage divider is the same as the one that addresses. This saves you that Have value. 50 awkward blowing of smoke into the ionization 3. Fire alarm system according to claim 1, dation chamber for test purposes. However, one needs characterized in that the test line (3) for this purpose special ionization chambers with the two different functional tests, namely the test grid mentioned or a corresponding test Operability and response-sensitive electrode are provided. This does not increase the smoke sensors (101 to 104), on two different only the structural complexity and the size of the ionizer differ Voltages (battery taps 31-3, tion chamber, but also their price. 31-4) below the operating voltage (battery- Furthermore, is from the German Auslegeschrift tap 31-2) can be connected. 1 281 321 a circuit for checking the radio 4. Fire alarm system according to claim 1, characterized by the readiness of fire alarms known, marked with wel, that the trigger arrangement 60 rather besides the two, the fire alarms, the loading (4,5,6) a field effect transistor (4), which, with lines supplying drive voltage, is a test track Control electrode (G) is provided on the connection line, which with the help of a switch point (7) of the two ionization chambers to different operating states (normal operation, (10,20), with its collector electrode (D) to the check, reset (can be switched. To this Power line (1) and with its emitter electrode 65 test line are each connected to Zener diodes, (5) via an impedance (8) to the power line which together act as an OR gate. The test (2) is connected, and between the power line is de-energized in the test state if all lines (1,2) connected series connection of a borrowed fire alarm, because then on