CH486083A - Installation of remote identification of detectors exercising surveillance - Google Patents

Description

Installation for the remote identification of detectors carrying out surveillance The main patent describes an installation for the remote identification of detectors carrying out surveillance and each associated with a relay, characterized in that it comprises a transmission line of pulses, connected to each of the relays and leading to a counting device, a connecting line connecting each of the relays to the neighboring relay, all the relays thus being connected in cascade, the triggering of a detector causing the triggering of its associated relay delivering a first pulse transmitted directly to the metering device by the pulse transmission line, and a second pulse transmitted by the connecting line to the neighboring relay and causing tripping of this relay, so that the first triggering of a detector causes, in addition to that of its associated relay, the first triggering in cascade of all the relays placed between it and the counting device, the transmission line of the pulses transmitting to the counting device a number of pulses equal to the number of relays having operated.

This setup works perfectly. However, it has a drawback and a shortcoming. The disadvantage is that, when the chain is put back into service, it may happen that one of the pulse generator relays used does not return to its initial state and is therefore not able to intervene Jans a later sequence, which can cause problems in subsequent counts.

The shortcoming is that the installation does not include any means of control.

The present invention overcomes the drawback and eliminates the deficiency cited above.

The installation forming the subject of the present invention is characterized in that the relays. in addition to their function as pulse generators, are arranged to supply constant current signals, the additional identification signals being, via the intermediary of the common line used for transporting the pulses, transmitted to an indicating apparatus which performs the sum of the currents emitted by the relays actuated sequentially, from the relay associated with a detector, this sum of currents constituting a control signal for the operation of the identification installation.

It can be seen that the installation according to the invention allows location by counting pulses and by summing currents and escapes RTI ID="0001.0270" WI="6" HE="4" LX="1775" LY="1437 "> the reproaches that Fon was able to make above to the installation according to the main patent since the warning device, when the installation is put back into service, will continue to give an indication in the cry where one of the West relay not returned to its initial state in which it does not emit any current.

On the other hand, the reading of the summation indicator device makes it possible to verify whether the count read from the pulse counter is exact. Any discrepancy between the readings of the indicating device and the meter indicates a state of trouble.

The appended drawing represents, schematically and by way of example, one form of execution of the object of the invention: The fi;. 1 is the diagram of this form of execution, and fig.@2 is a diagram illustrating the operation of one of the bodies represented at FIG. 1.

Relays 2A, 2ss...2N are each associated with a detector D1, D2, . . . dn. The relays are arranged in such a way that the operation of one of them actuates the next relay, and so cascades down to the last. But each relay. in addition to its function of generating pulses, has in addition a function of "constant current signal generator, this signal being emitted on a common transmission line -1.

fig. 2 shows, taking relay 2A as an example, how this additional function can be obtained by connecting, in parallel to capacitor C1 of the main patent, a constant current load Rccl (which may be a transistor, a constant current diode ott more simply a fixed resistor). When the contacts K1 and K2 close, a direct current flows through the resistor Rccl and, via the common transport line 4, arrives at the measuring device 5 (fi-. 1).

We also see at the fia. 2 the start 3 of the resistor R1 circuit of the main patent, which ensures the actuation of the following relay.

The relays can be of any type, known per se, for example thyratrons, semiconductors, etc., and can be incorporated into the detectors.

Each time one of these relays is activated, it emits a constant current si#_,nal on line 4, so that the intensity of the current flowing through line 4 is equal to the sum of the currents emitted by the relays chain operated. If 1 is the current produced by a relay and m the number of relays operated sequentially, the current intensity on line 4 will be ml. This intensity measured on a measuring device 5 therefore determines the number of relays which have intervened in the chain and. therefore, identifies the detector that caused the alarm. Thus, if the detector D1 operates, for example following the appearance of smoke detecting the start of a fire, it activates the relay 2A which is associated with it. This sends a constant current signal I on line 4 and excites the next relay 2B through connection C3. Relay 2B, in turn, outputs an I signal on line 4 and energizes the next relay 2C, and so on until the last relay 2N has operated and outputs a 1 signal. On line 4 it will be therefore appeared a current signal of amplitude NI which is measured on the indicator device 5. This can be a milliammeter or an ammeter, possibly Lgraded in number of detectors, or even an electronic voltmeter, or even both when the number of detectors installed is high; the milliammeter can then give a rough indication (ten, hundred, etc. for example) and the electronic voltmeter a precise indication in this range.

In the installation thus produced, it can be seen that when the detector chain is put back into service from a central station, by a device such as that described in the main patent, if a detector does not return to its state initial, the relay associated with it will continue to supply a signal I on line 4, so that an indication will remain on device 5 and the operator will be able to detect the fault immediately. If, for example, the detector 132- does not return to its initial state, the relay 2B emits its signal I and excites the relay 2C as described above, and so on. The apparatus 5 identifies in this case the detector D2 by the number N-1, since (N-1) relays have remained in circuit.

The installation described therefore ensures perfect security: in combination with a counting device, as represented schematically at 7, it is understood that the apparatus 5 allows verification of the indications of the counter, which doubles the security of the installation. .

Claims (5)

CLAIM Installation for the remote identification of detectors exercising surveillance and each associated with a relay, according to the claim of the main patent, characterized in that the relays, in addition to their function as pulse generators, are arranged to supply constant current signals, these additional identification signals being, via the common line used for transporting the pulses, transmitted to an additional indicating device which calculates the sum of the currents emitted by the sequentially operated relays, from of the relay associated with a detector, this sum of currents constituting a control signal for the operation of the identification installation. SUB-CLAIMS 1. Installation according to claim, characterized in that the relays are thyratrons. 2. Installation according to claim, characterized in that the relays are semiconductor devices. 3. Installation according to claim, characterized in that the relays are incorporated in the detectors. 4. Installation according to claim, characterized in that the indicator device is an ammeter. 5. Installation according to claim, characterized in that the indicator device is an electronic voltmeter.