SYSTEM, KIT AND METHOD FOR ELECTRICAL MONITORING OF A PREMISES

Abstract

A monitoring and warning system (1) for equipment to be monitored (2) in a room (3), comprising a monitoring unit (4) connected between a general power supply (5) and a power input (6) of the equipment to be monitored (2); a warning panel (7) positioned at an entrance to the room (3), and comprising at least one or more indicator lights (8), the monitoring unit (4) comprising a wireless communication unit (10), configured to transmit to the warning panel (7), via a wireless link, a signal for activating or deactivating at least one of the indicator lights (8), the transmission or not of the activation or deactivation signal via the wireless link being determined by the monitoring unit (4) by means of a repeated analysis of the current induced at the power input of the equipment to be monitored.

Description

Title of the invention: SYSTEM, KIT AND METHOD FOR ELECTRICAL MONITORING OF A PREMISES

[0001] The present invention relates to a system, a kit, and a method for electrical monitoring of a room, in particular a closed room, equipped with devices connected to an electrical supply network and which may present an objective physical danger to a person entering when said devices are in operation, or for which regulations relating to the safety of persons are applicable requiring a warning before entering the room in question for such devices.

[0002] Generally speaking, surveillance systems, whether or not equipped with a warning system, for premises or spaces containing various and varied objects are already known, for example, intrusion alarm systems being a classic example. The same applies to certain premises with regulated access, for example, X-ray rooms, or rooms or premises equipped with certain instruments or equipment which may present an objective physical danger to people entering them, for example rooms equipped with lasers.

[0003] Taking the more specific example of a closed room or premises equipped with lasers, for example, in the case of a research, study, diagnostic, and / or production laboratory, the regulations in France, in the European Union, and in other countries, require a sign and / or a warning located outside the room or premises, this sign or warning having to clearly indicate to persons outside the room that the lasers are in operation. For example, in accordance with standard EN 60825-1, 6.7.1 and 6.7.2, each class 3R laser system in the wavelength range below 400 nm and above 700 nm, and each class IC, class 3B and class 4 laser system must provide a "warning device giving an audible or visual signal when the laser system is switched on (...).The visible warning device(s) must be located so that their observation does not require exposure to laser radiation (...).

[0004] When it comes to laser rooms, there are already a number of homemade and / or commercial implementations. One of these implementations leaves the activation of the warning and monitoring to the laser user, who must manually turn on the warning sign via a switch located next to the laser. The installation of this type of circuit is often carried out by a qualified electrician, who connects the switch to the laser warning sign via a electrical installation. Therefore, the switches are permanently placed in the laboratory, and the wires are integrated into the wall or hidden in conduits. If the lasers change location, these switches may be in inappropriate places. As mentioned above, the monitoring and warning system is switched on manually, which requires action on the part of the user. The reliability of such a system therefore depends on the rigor of the equipment operator. In addition, the switch is very often located at the entrance to the laboratory, instead of next to the laser, which is inconsistent with the application note of article 6.7.3 of the EN 60825-1 standard, which stipulates that the switch must be close to the system. It is thus confused with the switch for switching on the general lighting, which results in the random switching on of the safety panel.It also often happens that the user then forgets to turn off the panel, and the signal lamp then remains lit unnecessarily, sometimes even for days on end. In the end, the visitor therefore gets used to such a situation and no longer takes this signal seriously. Over time, visitors no longer pay attention to this signal which is too often switched on wrongly, which in turn causes the installation to no longer comply with the standard identified above.

[0005] Another known implementation is that of the company Laser Safety Systems LLC (USA). This system is composed of modules designed to be connected together in a single line consisting of 8 cables. This is a parallel circuit configuration where each safety controller has a direct action on the entire system. The user purchases only the modules necessary to perform a desired interlock control function, for example: - a laser warning module is placed at the entrance to a laboratory; - a lock control module allows the control on the laboratory to be armed or disarmed; - an emergency module consists of an emergency button which stops all actions in progress; - an access monitoring module is wired to a door or roller shutter position sensor, and if one of them opens, the laser emission is stopped; - a laser / shutter interface module provides dry contacts for the laser or shutter. It also has a “laser ON” switch for manually controlling the system.

[0006] Depending on the modules purchased, this assembly has two operating modes: - manual mode in which the user warns of the laser being switched on by pressing the arming button located on the laser interface module, in which case the warning module is switched on and access is monitored; - automatic mode in which opening a shutter releases the laser beam and causes the laser room monitoring mode to turn on; - a second possibility is to intervene directly in the laser power supply box, but such manipulation is very often prohibited by laser manufacturers, because modifying an electrical circuit inside the laser voids its warranty.

[0007] A third known implementation is proposed by the company Lasermet Ltd (UK). In these systems, the lasers are electrically wired to distribution boxes, the latter being managed by a central unit connected to a laser warning sign. The wired connections require either a specific connection to the laser power supply or the presence of an optical sensor next to the laser output. This central unit is capable of monitoring all doors, windows or roller shutters in the laboratory. If one of them accidentally opens, the unit is thus able to deactivate the laser in operation. It is also capable of activating laser interlocks, beam shutters and warning signs. It can be equipped with entry / exit overrides and emergency stop switches. A key lock can prevent unauthorized use.When the laser ignition is detected, corresponding information is sent to the central unit via the control box, and the signal panel is lit.

[0008] Such a solution nevertheless brings significant constraints in terms of implementation and / or costs, including: - the presence of a specific output called “external interlock” on the laser power supply; - direct intervention on the power supply electronics, thereby risking voiding the laser equipment manufacturer's warranty; - the purchase of an optical sensor, the price of which depends on the wavelength and the power to be detected by the laser.

[0009] Under these conditions, the lasers must necessarily be arranged in a dedicated room, and at fixed locations. The cost of such an assembly does not allow opting for such a monitoring and warning system during temporary experiments, lasting only a few months, for example, or using low-cost lasers.

[0010] One aspect of the present invention therefore relates to a system, a kit and a method for electrical monitoring and alerting of a room, in particular a closed room, equipped with equipment connected to an electrical supply network and which may in particular present an objective physical danger for a person entering the room when said devices are in operation.

[0011] According to one aspect then, the invention relates to a system for monitoring and warning equipment to be monitored housed in a room, comprising: - a monitoring unit connected between a general power supply serving the premises and a power supply input for the equipment to be monitored; - a warning sign positioned at an entrance to the premises housing said equipment to be monitored, the warning sign comprising at least one, or more, indicator lights; wherein the monitoring unit comprises a wireless communication unit, configured to transmit to the warning panel, without a wired connection, a signal for activating or deactivating one or more indicator lights; wherein whether or not the wireless communication unit of the monitoring unit transmits the activation or deactivation signal is determined by the monitoring unit through repeated analysis of the current induced at the power input of the equipment to be monitored.

[0012] One aspect therefore relates to such a monitoring and warning system, which activates, remotely and without a wired connection, a luminous warning panel located outside, and preferably at an entrance, to the premises, and which thus indicates the presence of equipment, or a device, which is in operation. If the premises contains several electrical equipment, each connected to a system according to the invention, the luminous warning panel outside the premises can, for example, also identify the state of each device or equipment under surveillance, so that, for example, a user can wear adequate personal protective equipment (PPE) before entering the premises.

[0013] According to another aspect, the equipment to be monitored is a class 3R laser, preferably operating in the wavelength range below 400 nm and above 700 nm, or of class IC, 3B, or 4. Although the present application presents as an example the case of a room containing one or more lasers of the indicated type, this system could also be applied to other equipment requiring monitoring and warning to persons who are likely to enter the room housing them, which equipment could present an immediate and objective danger to these persons when they are in operation, for example, imaging systems, radiography, etc.

[0014] According to yet another aspect, the monitoring and warning system further comprises an identification panel of the equipment to be monitored, located near the warning panel, or integrated into the warning panel. When located near the warning panel, the identification panel may comprise other indicator lights, for example LEDs, indicating one or more operating states of the equipment under monitoring, for example, LEDs that can change color under the control of the monitoring unit, and / or LEDs that can be set to flash, depending on a given operating state, for example, to signal a fault or other operating anomaly. Furthermore, the identification panel may also include other means of displaying information, for example, an integrated screen, such as a display screen, showing the status of the equipment under surveillance.

[0015] According to yet another aspect, the monitoring unit is configured to monitor the induced current, at the power input of the equipment to be monitored, at regular intervals after connecting the equipment to the monitoring unit, the latter being connected to the power supply, and preferably, to an electrical outlet and supplying current to the power input of the equipment to be monitored. The monitoring system is then designed and configured to be able to operate according to an automatic or manual or even semi-automatic monitoring mode.

[0016] According to another aspect, the regular interval for monitoring the induced current, at the power input of the equipment to be monitored, is between 1 second and 10 seconds, and preferably is 3 seconds. This delay allows, if necessary, stabilization of the induced current of the equipment to be monitored.

[0017] According to another aspect, the monitoring unit is configured to detect a variation in current intensity between the power supply, and preferably, between the mains socket and the power input of the equipment to be monitored, and compare it to a threshold value previously recorded in the monitoring unit.

[0018] According to another aspect, the monitoring unit comprises a first current sensor (CCI), and a second current sensor (CC2), and the monitoring unit is configured to calculate an average value identified as AvgC(cci,cc2) equal to ((CCI + CC2) / 2), from the current intensity values ​​measured respectively by the first current sensor (CCI) and the second current sensor (CC2).

[0019] According to another aspect, the monitoring unit is also configured to calculate the difference CDiff(Cc2,ccih i.e. the difference between the current intensity value measured by the second current sensor (CC2) and the current intensity value measured by the first current sensor (CCI).

[0020] According to another aspect, the monitoring unit is also configured to: a. carry out an initial self-calibration of the equipment to be monitored when it is connected to the monitoring unit, when the monitoring unit is switched on, and before switching on the equipment to be monitored; and b. perform a second self-calibration of the equipment to be monitored when it is connected to the monitoring unit, after switching on the monitoring unit and subsequently switching on the equipment to be monitored.

[0021] According to another aspect, the monitoring unit is further configured to: a. calculate a threshold value from a first average of current values ​​measured during the first self-calibration and from a second average of values current measured during the second self-calibration; b. store the calculated threshold value in a memory associated with or integrated into the monitoring unit.

[0022] According to another aspect, the series of successive values, designated CCl(in) and CC2(in), of current measured respectively by the current sensors (CCI, CC2) comprises between 2 and 10 successive measurements for each sensor, where n is greater than 2 and equal to or less than 10. Preferably, the series of successive values ​​of current measured by the current sensors CCI, and CC2 comprises 5 successive measurements, which is a median value between the two limits indicated above.

[0023] According to another aspect, the monitoring unit is configured to communicate a unique identifier corresponding to a single piece of equipment to be monitored, via the wireless communication unit, to the identification panel of the piece of equipment to be monitored and identified by the monitoring unit. These identification panels may be multiple, for example, in the case where the premises to be controlled are equipped with several access doors.

[0024] According to another aspect, the monitoring unit comprises a programmable controller configured to perform at least one of the following operations: a. receiving a series of current intensity values ​​measured respectively by the first current sensor and by the second current sensor (CCl(in), CC2(in)), in the off state (OFF) of the equipment to be monitored; b. receiving a series of current intensity values ​​measured respectively by the first current sensor and by the second current sensor (CCl(in), CC2(in)), in the ON state of the equipment to be monitored; c. calculating an average value AvgC(Cci),(cc2) for each respective series of measured current intensity values ​​according to the respective equations CCl(in) / n)oFF , (CCl(in) / n)ON, (CC2(i.„) / n)oFF, (CC2(in) / n)ON respectively, where n is the number of values ​​in each respective series; d. calculation of the mean values ​​AvgCC(Cci),(cc2),oFF and AvgCC(Cci),(cc2),oN respectively from each respective mean AvgC(Cci),(cc2) according to the equation (AvgC (cci) + AvgC(cc2)) / 2; e. calculation of an activation threshold value from the difference between the average AvgCC(cci),(cc2),0N and AvgCC(cci),(cc2).0FF, namely according to the equation x% * [AvgCC (cci),(cc2),on - AvgCC(cci),(cc2),oFFL where x% is a value between 60% and 66%; f. calculation of an authorized current difference threshold value (CDiffMaxAut) according to the equation (1 + AvgCC(Cci),(cc2),0N(1 / 75)); g. storage of each of these calculated values ​​in a memory associated with or integrated into the programmable controller; h. comparing the value of CDiff(Cc2,cci) to the value of CDiffMaxAut, and if the value of CDiff(cc2,cci) is greater than the value of CDiffMaxAut, then measurements are stopped, and advantageously, an audible signal is emitted indicating an incoherent current, or a problem on at least one of the sensors; i. comparing the average value AvgCC(Cci),(cc2) with the activation threshold value, and if the average value AvgCC(Cci),(cc2) is equal to or greater than the activation threshold value, then sending an activation command via the wireless communication unit to the warning panel to turn on the warning light.

[0025] According to yet another aspect, there is provided a kit for monitoring and warning equipment to be monitored, comprising: a. a monitoring unit in the form of a housing configured to connect to a power supply, and preferably to a power outlet, the housing being further provided with an intermediate or pass-through power outlet, the housing integrating a programmable controller, a wireless communication unit, a first current sensor and a second current sensor; b. a warning panel equipped with a wireless receiver, and one or more indicator lights, each indicator light being activated or deactivated depending on a command received by the wireless receiver from the wireless communication unit of the monitoring unit; c. optionally an identification panel of the equipment to be monitored, located near the warning panel or integrated into the warning panel; d the programmable controller of the monitoring unit being configured to transmit or not, to the wireless receiver of the warning panel, the command to activate or deactivate the indicator light(s), following a repeated analysis of the current induced at a power input of the equipment to be monitored.

[0026] According to yet another aspect, there is provided a method of monitoring and warning electrical equipment to be monitored, the method comprising: a. the installation of a system as described above, or a kit as described above, for monitoring and warning, this installation comprising: i. the connection of a monitoring unit to a power supply, and preferably to a power outlet, in a room housing equipment to be monitored; ii. the connection of equipment to be monitored to the monitoring unit; iii. installing a warning panel positioned at an entrance to the premises housing said equipment to be monitored, the warning panel comprising at least one or more indicator lights and a wireless receiver, the receiver of the warning panel being configured to receive from the monitoring unit, via a wireless link, a signal for activating or deactivating the indicator light(s); b. after switching on the monitoring unit, and in succession to the equipment to be monitored, the execution by the programmable controller of at least one of the operations described above.

[0027] The present invention will be described in more detail below, with reference to the attached figures, illustrating an exemplary embodiment: - [Fig.lA] is a schematic representation of the system according to the invention, illustrating some of its components; - [Fig.lB] is a schematic representation of the installation of the system according to [Fig.lA], to protect a room containing equipment to be monitored.

[0028] Detailed Description Referring to FIG. 1A and [Fig. 1B], a monitoring and warning system (1) for an electrical current consuming equipment (2) to be monitored, for example a laser, housed in a room (3), is illustrated. The monitoring and warning system (1) comprises, among other things, a monitoring unit (4), which is connected to the general power supply (5) serving the room (3). The equipment (2) to be monitored has a power input (6), such as a male plug connected to a power cord of the equipment to be monitored (2), and is connected to the monitoring unit (4), via an intermediate socket, otherwise known as a pass-through socket, provided in the monitoring unit, for example, a female socket for receiving the male plug of the equipment to be monitored (2). The monitoring and warning system (1) also comprises a warning panel (7), comprising at least one, or more, indicator lights (8)..

[0029] The monitoring unit (4) may, for example, be presented in the form of a housing, and comprises a programmable controller (9), a wireless communication unit (10), connected to the programmable controller (9), the wireless communication unit (10) being configured to transmit radio frequency signals to the warning panel (7) which is equipped with a radio frequency receiver (11). The communication units that can be integrated into the monitoring unit are very widely known per se, as well as the radio frequency receivers (11) that can be integrated into the warning panel, and can implement a wide variety of wireless communication technologies, and / or implement one or more wireless communication protocols, such as LoRaWAN®, Bluetooth®, Zigbee, WiFi, etc. communication protocols, also generally known as such.The monitoring unit (4) is configured to transmit to the warning panel, without a wired connection, a signal for activating or deactivating at least one of the indicator lights of the warning panel (7). The transmission or non-transmission of the activation or deactivation signal by the wireless communication unit of the monitoring unit is determined by the monitoring unit (4). by means of repeated analysis of the current induced at the power input (6) of the equipment to be monitored (2), when the latter is connected to the monitoring unit (4) and the latter and the equipment to be monitored (2) are switched on.

[0030] As equipment to be monitored (2), a laser, or the power supply coupled to the laser, consumes an electric current both when it is switched on and when it is switched off. The system (1) according to the invention measures at regular time intervals, for example, every 3 seconds, the current induced in the power cable of the laser. When the laser is switched on, the current intensity increases. The monitoring unit (4), connected, for example, between a mains socket of the general power supply and the power supply input of the laser, detects the current variation and compares it to threshold values ​​previously recorded during a self-calibration phase of the system with the equipment to be monitored connected to the box.

[0031] To do this, the monitoring unit (4) also comprises a first current sensor (12) and a second current sensor (13), identical to the first current sensor, also connected to the programmable controller (9). The current values ​​measured by the first (12) and the second (13) sensor, identified respectively by CCI and CC2, are obtained by calculating an average of 5 measurements received from each sensor (12, 13) by the programmable controller (9). The current variations are represented by variables, stored in a memory associated with, or integrated into, the programmable controller (9), including: AvgC(cci.c22), which is the average of the current values ​​measured by the current sensors (12,13), i.e.: (CCI +CC2} / 2; and CDiff(cc2,cci), which is the difference between the value of the current measured by the second sensor (13) and the value of the current measured by the first sensor (12), i.e.: CC2 -CCI.

[0032] When the variable AvgC(cci,c22) exceeds a threshold value pre-recorded in the memory associated with, or integrated into, the programmable controller (9), a radiofrequency activation signal is then sent to the receiver (11) which lights up the warning panel (7) at the entrance to the room (3) in which the equipment to be monitored is housed.

[0033] At each current measurement, the monitoring and warning system (1) is configured to also perform a self-check, in order to detect possible faults or operating anomalies. The induced current is measured by the two current sensors (12, 13). The values ​​obtained are compared at each measurement. If the difference of the two values ​​CDiff(Cc2, cci) exceeds a threshold predefined during a prior self-calibration step, this means that one of the sensors is defective or that the current is unstable. An alarm signal is then generated, for example, via an LED yellow which lights up on the monitoring unit, for example, provided on the monitoring unit housing (4), and an audible signal sounds to alert the environment.

[0034] When equipment to be monitored, such as a laser, is first connected to the monitoring and warning system (1), or when changing equipment connected to the monitoring unit, a self-assessment or self-calibration of the current threshold is carried out in order to determine the value above which the equipment to be reported is considered to be "on". At the same time, a safety value is also calculated, above which the monitoring and warning system will consider that one of the current sensors (12, 13) is defective or that the current is unstable. These two thresholds are permanently recorded in the programmable controller. They are used by the programmable controller (9) as long as the self-calibration mode is not triggered again.The self-calibration mode can, for example, be initiated by simultaneously switching on the monitoring unit and pressing a corresponding button dedicated for this purpose. This state can be represented in the monitoring unit via a self-calibration LED, for example blue in color. Measurements of the currents CCI and CC2 are then carried out at the current sensors (12, 13) respectively before switching on the equipment to be monitored. A variable designated AvgC(Cci),(cc2)OFF is defined, which corresponds to an average for each sensor (12, 13) in the switched-off operating state, designated by (CCl(i.„ / n)OFF and (CC2(i.„ / n)OFF- An acoustic signal consisting of short beeps can then signal that the laser must be switched on and the self-calibration button pressed again. Measurements of CCI and CC2 are carried out again.A variable named AvgC(Cci),(cc2)ON is defined, corresponding to the average for each sensor (12,13) ​​in the operating state on, and designated by (CCl(i„) / n)oN and (CC2(in) / n)ON- From these two variables, the programmable controller calculates and stores in memory a trigger threshold, designated ActLim, calculated from the difference between the average AvgCC(Cci),(cc2),oN and AvgCC <cci),(cc2),off» selon l’équation x% * [AvgCC(cci),(cc2),0N - AvgCC(cci),(cc2),oFFL oùx% est une valeur comprise entre 60% et 66%. De préférence, et de manière avantageuse, la valeur de x est fixée à 60. Il s'agit alors d'un courant au-dessus duquel le signal d’activation de l’unité de surveillance sera transmis au panneau d’avertissement pour allumer une DEL rouge.During self-calibration, the programmable controller also calculates an allowed current difference threshold, designated (CDiffMaxAut), above which a system anomaly is signaled, via the equation (1 + AvgCC(cci),(cc2),oN(1 / 75))- .

[0035] When transmitting the radiofrequency signal for activating the warning and / or identification panel, the signal contains a first identification code which makes it possible to identify the warning panel (7) uniquely. Indeed, if the building has several rooms housing lasers, it is imperative to activate the correct indicator light located above the entrance to the room concerned. A second code is also included in the activation signal to the warning panel (7). This second code makes it possible to identify the laser and thus send the information to a second optional panel (14) designated "identification panel". If there are several lasers in a room to be monitored, this second code makes it possible to identify those which are switched on even before entering the corresponding room. A visitor can then know its location, its class, its emission wavelength and thus equip themselves with the appropriate personal protective equipment before entering the room.

[0036] The identification of the equipment to be monitored and the receivers (11) can advantageously implement switches of the “DIP switch” type, for example, integrated both in the monitoring unit (3) and in the receiver (11) of the warning and / or identification panel. Two switches are then integrated in the monitoring unit (4), for example in the housing, and one switch in the receiver (11). These switches can be set, for example, manually via four switches, thus allowing each a combination of 16 binary codes, ranging for example from 0000 to 1111. The unique communication codes entered in the receiver on the one hand, and in the monitoring unit on the other hand, are necessarily identical, but specific to each “monitoring unit / receiver” pair, in order to allow the monitoring unit (4) and the receiver (11) to communicate with each other.Thus identified, the monitoring unit can only transmit its radiofrequency signal to the receiver located at the entrance to the laser room with the same identification code.

[0037] The second code accessible in the monitoring unit is used to identify the laser. When sent to the receiver, this code makes it possible to identify up to 16 lasers on the identification panel (14) also located at the entrance to the laser room.

[0038] The monitoring unit (4) of the monitoring and warning system (1) according to the invention is thus configured to allow the identification of several pieces of equipment to be monitored, and in the example given here, 16 lasers, simultaneously. This makes it possible in particular to implement the monitoring and warning system (1) in 16 neighboring rooms. The range of the radiofrequency signal is adaptable, and is chosen to be able to cover a distance of several tens of meters indoors, and several hundreds of meters in open field, in particular via an adjustment of the intensity of the emitted radiofrequency signal. For example, the transmission frequency of the signal can be 867.5 MHz, and the maximum broadcast power 500 mW. At each transmission, the initialization of the receiver (11) and the correct reception of the signal are preferably also tested. In the event of failure, the signal can then and advantageously be retransmitted 5 times before an alarm signal sounds.

[0039] The monitoring and warning system is configured to allow both automatic and manual operation. The manual mode allows current tests to be dispensed with, since the current induced in the power input of the equipment to be monitored is no longer measured. In this case, it is a user of the monitoring system who takes control of the system, for example, by long-pressing a button provided for this purpose on the monitoring unit. In such a case, the indicator light on the warning panel (7) will turn on or off depending on the press of the dedicated button. The laser will also be identified on the identification panel (14). Return to automatic mode can be carried out by long-pressing the dedicated button on the monitoring unit.

[0040] A kit comprising the various identified elements of the system can be marketed and distributed, for example in the form of: - housing comprising a programmable controller, a storage memory, and two current sensors, and a wireless communication unit, optionally with operating status indicator lights, and unique identification switches; - warning sign comprising a wireless receiver, uniquely associated with the box; - identification panel, associated with, or integrated into, the warning panel.

[0041] The system, kit and method described in the present application have numerous advantages, including the following: - a self-assessment by the power measurement module; - triggering an alarm if the measuring unit is defective; - the calculation of a warning panel activation threshold which is automatically re-evaluated, at the user's request, ideally with each change of equipment to be monitored connected to the monitoring unit; - switchable unique identification of the “monitoring unit / warning panel receiver” pair; - self-assessment of wireless contact between the monitoring unit and the warning sign receiver; - alarm in case of failure of wireless contact between the monitoring unit and the warning panel receiver; - identification of the monitoring unit by the warning panel receiver.

[0042] Other benefits will be included or deductible from all of the above.

Claims

Claims

1. Monitoring and warning system (1) for equipment to be monitored (2) housed in a room (3), comprising: a monitoring unit (4) connected between a general power supply (5) serving the room (3) and a power supply input (6) of the equipment to be monitored (2); and a warning panel (7) positioned at an entrance to the room (3), the warning panel (7) comprising at least one, or more, indicator lights (8); according to which the monitoring unit (4) comprises a wireless communication unit (10), configured to transmit to the warning panel (7), without a wired connection, a signal for activating or deactivating one, or more, indicator lights (8);wherein whether or not the wireless communication unit of the monitoring unit transmits the activation or deactivation signal is determined by the monitoring unit (4) by means of repeated analysis of the current induced at the power input of the equipment to be monitored.;

2. A monitoring and warning system (1) according to claim 1, wherein the equipment to be monitored (2) is a class 3R laser, preferably operating in the wavelength range below 400 nm and above 700 nm, or class IC, 3B, or 4.

3. Monitoring and warning system (1) according to claim 1 or 2, wherein the monitoring and warning system (1) further comprises an identification panel (14) of the equipment to be monitored (2), located near the warning panel (7), or integrated into the warning panel (7).

4. A monitoring and warning system (1) according to any one of claims 1 to 3, wherein the monitoring unit is configured to monitor the induced current, at the power input of the equipment to be monitored, at regular intervals after connecting the equipment to the monitoring unit, the latter being connected to the power supply, and preferably to an electrical outlet and supplying current to the power input of the equipment to be monitored.

5. A monitoring and warning system (1) according to claim 4, wherein the regular interval of monitoring the induced current, at power input level of the equipment to be monitored, is 3 seconds.

6. A monitoring and warning system (1) according to any one of claims 1 to 5, wherein the monitoring unit is configured to detect a variation in current intensity between the power supply and the power input of the equipment to be monitored, and compare it to a threshold value previously recorded in the monitoring unit.

7. Monitoring and warning system (1) according to any one of claims 1 to 6, wherein the monitoring unit comprises a first current sensor (CCI), and a second current sensor (CC2), and the monitoring unit is configured to calculate an average value identified as AvgC(cci,cc2) equal to ((CCI + CC2) / 2), from the current intensity values measured respectively by the first current sensor (CCI) and the second current sensor (CC2).

8. Monitoring and warning system (1) according to any one of claims 1 to 7, wherein the monitoring unit is configured to calculate a difference CDiff(Cc2,cci), i.e. the difference between the current intensity value measured by the second current sensor (CC2) and the current intensity value measured by the first current sensor (CCI).

9. A monitoring and warning system (1) according to any one of claims 1 to 8, wherein the monitoring unit is further configured to: a. perform a first self-calibration of the equipment to be monitored when it is connected to the monitoring unit, upon switching on the monitoring unit, and before switching on the equipment to be monitored; and b. perform a second self-calibration of the equipment to be monitored when it is connected to the monitoring unit, after switching on the monitoring unit and subsequent switching on of the equipment to be monitored.

10. A monitoring and warning system (1) according to any one of claims 1 to 9, wherein the monitoring unit is further configured to: a. calculate a threshold value from a first average of current values measured during the first self-calibration and from a second average of current values measured during the second self-calibration; b. store the calculated threshold value in a memory associated with or integrated into the monitoring unit.

11. Monitoring and warning system (1) according to any one of claims 1 to 10, according to which a series of successive values, designated CCl(in) and CC2(in), of current measured respectively by the current sensors (CCI, CC2) comprises between 2 and 10 successive measurements for each sensor, where n is greater than 2 and equal to or less than 10, and preferably, comprises 5 successive measurements for each sensor respectively.

12. A monitoring and warning system (1) according to any one of claims 1 to 11, wherein the monitoring unit is configured to communicate a unique identifier corresponding to a single equipment to be monitored, via the wireless communication unit, to the identification panel of the equipment to be monitored.

13. A monitoring and warning system (1) according to any one of claims 1 to 12, wherein the monitoring unit comprises a programmable controller configured to perform at least one of the following operations: a. receiving a series of current intensity values measured respectively by the first current sensor and by the second current sensor (CC11 CC2i.„), where n is the number of values in each respective series, in the OFF state of the equipment to be monitored; b. receiving a series of current intensity values measured respectively by the first current sensor and by the second current sensor (CCl(in), CC2(in)), where n is the number of values in each respective series, in the ON state of the equipment to be monitored; c.calculating an average value AvgC(Cci),(cc2) for each respective series of measured current intensity values according to the respective equations (CCl(i_„) / n)oFF , (CCl(i-„ / n)ON» (CC2(i.„ / n)OFF» (CC2(1_„) / h)on respectively, where n is the number of values in each respective series; d. calculating the average values AvgCC(Cci),(cc2),oN and AvgCC(Cci),(cc2),oFF respectively from each respective average AvgC(Cci),(cc2) according to the equation (AvgC(cci) + AvgC(Cc2)) / 2 ;. e. calculation of an activation threshold value from the difference between the average AvgCC(Cci),(cc2),oN and AvgCC(Cci),(cc2).oFF, namely according to the equation x% * [AvgCC(Cci),(cc2),0N - AvgCC(Cci),(cc2).OFF], where x% is a value between 60% and 66%; f. calculation of an authorized current difference threshold value (CDiffMaxAut) according to the equation (1 + AvgCC(Cci),(cc2),0N(1 / 75)); g. storage of each of these calculated values in a memory associated with or integrated into the programmable controller; h. comparison of the value of CDiff(Cc2,cci) to the value of CDiffMaxAut, and if the value of CDiff(Cc2,cci) is greater than the value of CDiffMaxAut, then stop the measurements; i. comparing the average value AvgCC(Cci),(cc2) with the activation threshold value, and if the average value AvgCC(Cci),(cc2) is equal to or greater than the activation threshold value, then sending an activation command via the wireless communication unit to the warning panel to turn on the warning light.

14. Kit for monitoring and warning equipment to be monitored (2), comprising: a. a monitoring unit (4) in the form of a housing configured to connect to the power supply, and preferably to a power outlet, the housing being further provided with an intermediate or pass-through power outlet, the housing integrating a programmable controller, a wireless communication unit, a first current sensor and a second current sensor; b. a warning panel (7) equipped with a wireless receiver, and one or more indicator lights (8), each indicator light being activated or deactivated depending on a command received by the wireless receiver (11) from the wireless communication unit of the monitoring unit (4); c. optionally an identification panel of the equipment to be monitored (2), located near the warning panel or integrated into the warning panel; d. the programmable controller of the monitoring unit (4) being configured to transmit or not, to the wireless receiver of the warning panel (7), the command to activate or deactivate the indicator light(s) (8), following a repeated analysis of the current induced at a power input of the equipment to be monitored (2).

15. Method of monitoring and warning electrical equipment (2) to be monitored, the method comprising: a. the installation of a monitoring and warning system (1) according to any one of claims 1 to 13, or of a kit according to claim 14, for monitoring and warning, this installation comprising: i. the connection of a monitoring unit (4) to a general power supply (5) in a room (3) housing equipment to be monitored (2); ii. the connection of the equipment to be monitored (2) to the monitoring unit (4); iii. installing a warning panel (7) positioned at an entrance to the premises (3) housing said equipment to be monitored (2), the warning panel (7) comprising at least one or more indicator lights (8) and a wireless receiver (11), the receiver of the warning panel (7) being configured to receive from the monitoring unit (4), via a wireless link, a signal for activating or deactivating the indicator light(s) (8); b. after switching on the monitoring unit, and subsequently the equipment to be monitored, the execution by the programmable controller of at least one of the operations according to claim 13.

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