CN219225323U - On duty alarm system - Google Patents
On duty alarm system Download PDFInfo
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- CN219225323U CN219225323U CN202223602919.7U CN202223602919U CN219225323U CN 219225323 U CN219225323 U CN 219225323U CN 202223602919 U CN202223602919 U CN 202223602919U CN 219225323 U CN219225323 U CN 219225323U
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Abstract
The utility model discloses an on-duty alarm system. The system comprises: the automatic reset device comprises a switching power supply (1), a circuit breaker (2), a first timer (3), a second timer (4), a reset locking module (6), a switching value acquisition module (7), a first alarm (8), a second alarm (9) and a self-reset button switch (11), wherein the switching power supply (1) provides power; the first timer (3) controls the power on-off time of the first alarm (8); the second timer (4) controls the power on-off time of the second alarm (9); the self-reset button switch (11) is used for resetting the first timer (3) and the second timer (4); the self-reset button switch (11) is also used for providing a level signal for the reset locking module (6); the reset locking module (6) is used for providing a switching value signal for the switching value acquisition module (7). The utility model solves the technical problem that the on-duty state feedback of the on-duty room is not timely in the related art.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to an on-duty alarm system.
Background
Compared with the operation and maintenance duty of a large data center, the small data machine room often faces the shortage of duty personnel, the IT operation duty management is insufficient, the duty condition of the duty personnel cannot be effectively checked, and the response cannot be found in time when the personal safety emergency happens to the person on duty.
The small-sized data machine room often has other duty such as security duty besides the machine room duty, and when the emergency of personal safety occurs to the duty personnel, if the other duty personnel such as security duty can find and handle as soon as possible, valuable rescue time can be won.
The active external early warning measures such as mobile phones and PC application have more operation steps and need to be actively triggered, and under the condition that the physical conditions of the on-duty personnel of the machine room are not allowed, the opportunity of active calling for help can be lost.
Therefore, in the related art, there is a problem that the on-duty state feedback to the on-duty room is not timely.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the utility model provides an on-duty alarm system, which at least solves the technical problem that on-duty state feedback of an on-duty room is not timely in the related art.
According to an aspect of an embodiment of the present utility model, there is provided an on-duty alarm system including: the switching power supply (1), a circuit breaker (2), a first timer (3), a second timer (4), a reset locking module (6), a switching value acquisition module (7), a first alarm (8), a second alarm (9) and a self-reset button switch (11), wherein the switching power supply (1) provides power for the first timer (3), the second timer (4), the reset locking module (6), the first alarm (8) and the second alarm (9); the first timer (3) is connected with the first alarm (8) and used for controlling the power on-off time of the first alarm (8); the second timer (4) is connected with the second alarm (9) and used for controlling the power on-off time of the second alarm (9); the self-resetting button switch (11) is connected to the first timer (3) and the second timer (4) and is used for resetting the first timer (3) and the second timer (4); the self-resetting button switch (11) is also connected to the resetting locking module (6) and is used for providing a level signal for the resetting locking module (6); the reset locking module (6) is connected to the switching value acquisition module (7) and is used for providing switching value signals for the switching value acquisition module (7).
Optionally, the on-duty alarm system further includes: intermediate relay (5) and auto-lock button switch (10), wherein, auto-lock button switch (10) with second time-recorder (4) are connected, second time-recorder (4) with intermediate relay (5) are connected, intermediate relay (5) with switching value collection module (7) are connected, auto-lock button switch (10) are used for bypassing control of second time-recorder (4) is intermediate relay (5) and second alarm (9) switch-on power, switching value collection module (7) still are used for gathering switching value signal of intermediate relay (5).
Optionally, the first timer (3) is a first digital display time relay, and/or the second timer (4) is a first digital display time relay.
Optionally, the time delay on time of the normally open contact of the first digital display time relay is adjustable within a first preset time range, and the time delay on time of the normally open contact of the second digital display time relay is adjustable within a second preset time range.
Optionally, the first predetermined time range is 1 second to 99 hours, and the second predetermined time range is 1 second to 99 hours.
Optionally, the normally open contact delay off time of the reset lockout module (6) is adjustable within a third predetermined time range.
Optionally, the third predetermined time range is 1 second to 10 minutes.
Optionally, the first alarm (8) is an acousto-optic alarm and/or the second alarm (9) is an acousto-optic alarm.
Optionally, the switching value acquisition module (7) is also used for docking an external monitoring system and/or for remote alarming.
Optionally, the on-duty alarm system is a single on-duty alarm system.
In the embodiment of the utility model, the mode of respectively alarming by adopting the two alarms is adopted, and the purpose that when one alarm is not active, the other alarm can also act in time is achieved by setting based on different alarm times, so that the technical effect of timely feeding back the on-duty state of the on-duty room is realized, and the technical problem of untimely feeding back the on-duty state of the on-duty room in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a schematic diagram of an on-duty alarm system provided in accordance with the present utility model;
FIG. 2 is a schematic diagram of the structure of the on-duty audible and visual alarm system of the present utility model;
FIG. 3 is a schematic diagram of an on-duty audible and visual alarm system of the present utility model;
FIG. 4 is a schematic diagram of the connection of the on-duty audible and visual alarm system of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present utility model, there is provided an on-duty alarm system, fig. 1 is a schematic diagram of the on-duty alarm system provided according to the present utility model, as shown in fig. 1, the on-duty alarm system includes: the switching power supply 1, the circuit breaker 2, the first timer 3, the second timer 4, the reset locking module 6, the switching value acquisition module 7, the first alarm 8, the second alarm 9 and the self-reset button switch 11, wherein the switching power supply 1 provides power for the first timer 3, the second timer 4, the reset locking module 6, the first alarm 8 and the second alarm 9; the first timer 3 is connected with the first alarm 8 and controls the power on-off time of the first alarm 8; the second timer 4 is connected with the second alarm 9 and controls the power on-off time of the second alarm 9; the self-resetting button switch 11 is connected to the first timer 3 and the second timer 4 and is used for resetting the first timer 3 and the second timer 4; the self-resetting button switch 11 is also connected to the resetting locking module 6 and is used for providing a level signal for the resetting locking module 6; the reset locking module 6 is connected to the switching value acquisition module 7 and is used for providing a switching value signal for the switching value acquisition module 7.
By adopting the mode that the two alarms respectively alarm, the purpose that when one alarm does not work, the other alarm can work in time is achieved through the setting based on different alarm times, so that the technical effect of timely feeding back the on-duty state of the on-duty room is achieved, and the technical problem that the on-duty state of the on-duty room is not fed back in time in the related art is solved.
As an alternative embodiment, the above-mentioned on-duty alarm system may be applied to an on-duty room of a small-sized on-duty room, for example, an on-duty room with only one person on duty, for example, the above-mentioned on-duty alarm system may be a single on-duty alarm system.
As an alternative embodiment, the duty alarm system may further include: intermediate relay 5 and auto-lock button switch 10, wherein, auto-lock button switch 10 with second time-recorder 4 is connected, second time-recorder 4 with intermediate relay 5 is connected, intermediate relay 5 with switching value collection module 7 is connected, auto-lock button switch 10 is used for bypassing the control of second time-recorder 4 is intermediate relay 5 and second alarm 9 switch-on power, switching value collection module 7 still is used for gathering intermediate relay 5's switching value signal.
By the arrangement of the self-locking button switch 10 and the second alarm 9, the second alarm 9 can directly alarm without being controlled by the second timer 4. When the personnel on duty meet the accident, the self-locking button switch 10 can be manually pressed to give an alarm in time, so that the accident is effectively avoided.
As an alternative embodiment, the types of the first timer 3 and the second timer 4 may be various, for example, the first timer 3 may be a first digital display time relay, and the second timer 4 may be a first digital display time relay.
As an alternative embodiment, the time delay on time of the normally open contact of the first digital display time relay is adjustable within a first predetermined time range, and the time delay on time of the normally open contact of the second digital display time relay is adjustable within a second predetermined time range.
As an alternative embodiment, the first predetermined time range is 1 second to 99 hours, and the second predetermined time range is 1 second to 99 hours. Through the arrangement of the first digital display time relay and the second digital display time relay 4, the normally open contact time delay on time is adjustable from 1 second to 99 hours, the reset function is realized, the reset of the on timing is realized, and the timing is restarted from zero after the reset.
It should be noted that the above first predetermined time range is 1 second to 99 hours, and the second predetermined time range is 1 second to 99 hours, which is merely an example, and other desired time ranges are possible.
As an alternative embodiment, the time-lapse open time of the normally open contact of the reset lockout module 6 is adjustable within a third predetermined time range. Alternatively, the third predetermined time range may be 1 second to 10 minutes. Namely, the normally open contact of the reset locking module 6 can be opened in a delayed manner after receiving the closing of the action signal, and the delay time is adjustable from 1 second to 10 minutes; the contact actuation signal is controlled by a self-resetting push button switch 11.
As an alternative embodiment, the types of the first alarm 8 and the second alarm 9 may also be multiple, for example, the first alarm 8 is an acousto-optic alarm and/or the second alarm 9 is an acousto-optic alarm. The audible and visual annunciator may emit sufficient audible and visual stimulus to thereby draw sufficient attention.
The switching value acquisition module 7 is also used for interfacing with an external monitoring system and/or for remote alarm. The on-off value acquisition module 7 is used for realizing the intercommunication between the on-duty alarm system and other monitoring systems, and can effectively complete the cooperation task between data.
The time counting of the first digital display time relay 3 and the second digital display time relay 4 is used for realizing the actions of the acousto-optic alarm 8 and the acousto-optic alarm 9, the operator can manually reset the first digital display time relay 3 and the second digital display time relay 4 to count down again through the self-reset button switch 11, the self-locking button switch 10 is used for directly contacting the sounding light alarm 9, the reset button action is converted into a dry contact signal through the reset locking module 6 to provide enough sampling time for the switching value acquisition module 7, and the intermediate relay 5 is used for providing a dry contact acquisition signal for the switching value acquisition module 7.
In addition, through this audible and visual alarm system on duty, still can set for a time as required, after reaching this time, the system triggers audible and visual alarm, reminds person on duty button to reset, otherwise after a settable time again, another audible and visual alarm triggers, reminds other personnel in fixed place to have the unexpected condition to take place. The attendant can directly touch the audible and visual alarm through the self-locking button switch 10, and the accident situation is pre-warned. The actions such as manual reset and direct trigger can be collected by the switching value collection module 7, can be connected to other monitoring systems such as environment monitoring and the like in a butt joint mode, records the action time, and can trigger remote alarms such as short messages, telephones and the like.
Based on the above embodiments and alternative embodiments, an alternative implementation is provided.
Fig. 2 is a schematic structural diagram of the on-duty acousto-optic alarm system of the present utility model, as shown in fig. 2, the on-duty acousto-optic alarm system provided by the present utility model includes a switching power supply 1, a circuit breaker 2, a digital display time relay 3 (i.e. the first timer 3), a digital display time relay 4 (i.e. the second timer 4), an intermediate relay 5, a reset locking module 6, a switching value acquisition module 7, an acousto-optic alarm 8 (i.e. the first alarm 8), an acousto-optic alarm 9 (i.e. the second alarm 9), a self-locking button switch 10, and a self-reset button switch 11.
The switch power supply 1 is respectively connected with the digital display time relay 3, the digital display time relay 4, the reset locking module 6, the self-locking button switch 10 and the self-resetting button switch 11 and provides 12V direct current input; the digital display time relay 13 is connected with the control audible and visual alarm 8; the digital display time relay 4 is connected with the control intermediate relay 5 and the audible and visual alarm 9; the self-reset button switch 11 is connected with reset terminals of the digital display time relay 3 and the digital display time relay 4, can reset the digital display time relay 3 and the digital display time relay 4, and is also connected with a signal terminal of the reset locking module 6 to provide a locking signal of the reset locking module 6, and the reset locking module 6 is connected with the switching value acquisition module 7 to provide a switching value signal; the self-locking button switch 10 can bypass the digital display time relay 4 to be connected with the audible and visual alarm 9 and the intermediate relay 5, and the intermediate relay 5 is connected with the switching value acquisition module 7 to provide switching value signals.
Fig. 3 is a schematic diagram of the on-duty audible and visual alarm system of the present utility model, as shown in fig. 3, which is a schematic diagram of the present utility model. The principle is as follows:
the switch power supply 1 is connected with the circuit breaker 2, and the circuit breaker 2 is connected with the digital display time relay 3, the digital display time relay 4, the self-locking button switch 10 and the self-resetting button switch 11 to provide 12V direct current input;
the digital display time relay 3 is connected with the audible and visual alarm 8 through the normally open contact 3-1 to control the power supply to be turned on in a delayed manner, and the audible and visual alarm 8 acts to emit audible and visual alarm after power is obtained;
the digital display time relay 4 is connected with the control audible and visual alarm 9 through the normally open contact 4-1 to delay the power on, and the audible and visual alarm 9 acts to send out audible and visual alarm after power is obtained;
the digital display time relay 4 is connected with the intermediate relay 5 through the normally open contact 4-1 to control the intermediate relay 5 to be connected with a power supply in a delayed manner, and the intermediate relay 5 is connected with the switching value acquisition module 7 of the normally open contact through the normally open contact 5-1 to provide a switching value signal;
the reset locking module 6 provides a switching value signal for the switching value acquisition module 7 through the normally open contact 6-2;
the self-reset button switch 11 is connected with a reset terminal 3-2 of the digital display time relay 3, a reset terminal 4-2 of the digital display time relay 4, and the digital display time relay 3 and the digital display time relay 4 can be reset when pressed down, and is also connected with a signal terminal 6-1 of the reset locking module 6 to provide a high-level locking signal of the reset locking module 6, and after the signal terminal of the reset locking module 6 receives the high-level signal, a normally open contact 6-2 of the self-reset button switch is closed and automatically opened after a certain time delay to provide a switching value signal for the switching value acquisition module 7;
the self-locking button switch 10 is connected with the intermediate relay 5 and the audible and visual alarm 9, and can bypass the control of the digital display time relay 4 when being pressed down to directly switch on the power supply for the intermediate relay 5 and the audible and visual alarm 9, the audible and visual alarm 9 acts to send out audible and visual alarm after being electrified, and the intermediate relay 5 provides a switching value signal for the switching value acquisition module 7 connected with the normally open contact 5-1.
Fig. 4 is a schematic diagram of a connection manner of the on-duty acousto-optic alarm system according to the present utility model, as shown in fig. 4, which is a schematic diagram of a connection manner of the present utility model in a specific embodiment. In the figure, the digital display time relay 3 and the digital display time relay 4 are the same type and specification products, the terminals (2) - (7) are connected with a power supply, (8) - (6) are normally open contacts, (8) - (5) are normally closed contacts, (1) - (3) are reset, and (1) - (4) are suspended; in the figure, the relay has terminals (7) - (8) as an access power supply, normally open contacts (4) - (6) and (3) - (5), and normally closed contacts (4) - (2) and (3) - (1); in the figure, a terminal VCC of the reset locking module is connected with a positive electrode of a power supply, GND is connected with a negative electrode of the power supply, CB-COM is a normally closed contact, CK-COM is a normally open contact, SIGNAL is a SIGNAL terminal, high level is effective, and the SIGNAL terminal controls the contact to delay after receiving a SIGNAL;
the circuit principle of this embodiment is as follows:
the switch power supply 1 is connected with the circuit breaker 2, and the circuit breaker 2 is connected with the digital display time relay 3, terminals (2) - (7) of the digital display time relay 4, a reset locking module 6 terminal VCC-GND, a self-locking button switch 10 and a self-resetting button switch 11 to provide 12V direct current input;
the digital display time relay 3 is connected with the audible and visual alarm 8 through normally open contacts (8) - (6) thereof to control the audible and visual alarm 8 to be connected with a power supply in a delayed manner, and the audible and visual alarm 8 acts to emit audible and visual alarms after power is obtained;
the digital display time relay 4 is connected with the intermediate relay 5 through the normally open contacts (8) - (6) to control the time delay to switch on the power supply, the intermediate relay 5 is connected with the audible and visual alarm 9 through the normally open contacts (4) - (6) to control the audible and visual alarm 9 to switch on the power supply, and the audible and visual alarm 8 acts to emit audible and visual alarm after power is obtained;
the reset locking module 6 provides a switching value signal for the switching value acquisition module 7 through the normally open contact CK-COM thereof;
the self-reset button switch 11 is connected with reset terminals (1) - (3) of the digital display time relay 3 and the digital display time relay 4, and can reset the digital display time relay 3 and the digital display time relay 4 when being pressed down, and is also connected with a SIGNAL terminal SIGNAL of the reset locking module 6 to provide a high-level locking SIGNAL of the reset locking module 6, and after the SIGNAL terminal SIGNAL of the reset locking module 6 receives the high-level SIGNAL, a normally open contact CK-COM of the self-reset button switch is closed and is automatically disconnected after a certain time delay to provide a switching value SIGNAL for the switching value acquisition module 7;
the self-locking button switch 10 is connected with the intermediate relay 5, and can bypass the control of the digital display time relay 4 to directly switch on the power supply for the intermediate relay 5 when being pressed, the audible and visual alarm 8 is connected with normally open contacts (4) - (6) of the intermediate relay 5, so that the audible and visual alarm can be sent out when the electric power is applied, and the switching value signal is provided for a switching value acquisition module 7 connected with the normally open contacts (4) - (6) of the intermediate relay 5 after the electric power is applied.
Therefore, the on-duty audible and visual alarm system provided by the utility model adopts a hardware circuit design to realize automatic alarm, and comprises a switching power supply, a circuit breaker, a digital display time relay, an intermediate relay, a reset locking module, a switching value acquisition module, an audible and visual alarm, a self-locking button switch and a self-resetting button switch; the switching power supply provides 12V direct current for the digital display time relay, the intermediate relay, the reset locking module and the audible and visual alarm; the digital display time relay controls the power on-off time of the audible and visual alarm, and one digital display time relay also controls the power on-off of the intermediate relay; the reset button switch can reset the digital time relay when being pressed down, and simultaneously provides a high level signal for controlling the reset locking module, and the reset locking module provides a switching value signal for the switching value acquisition module; when the self-locking button switch is pressed down, the control of the digital display time relay can be bypassed to enable the audible and visual alarm to act; the switching value acquisition module acquires switching value signals of the intermediate relay and the reset locking module. The countdown action of the audible and visual alarm is realized through the digital display time relay, the manual reset of the digital display time relay is realized through the self-reset button switch, the audible and visual alarm is directly contacted through the self-reset button switch, and a dry contact point acquisition signal is provided for the switching value acquisition module through the reset locking module and the intermediate relay, so that the audible and visual alarm can be used for button switch action record. The system can set a time according to the needs, after the time is reached, the system triggers an audible and visual alarm to remind a person on duty of button reset, otherwise, after a settable time is passed, another audible and visual alarm triggers to remind other persons on a fixed place that accidents possibly happen. The operator can also directly trigger the acousto-optic alarm and early warn the outside. In addition, actions such as manual reset and direct triggering are collected by the switching value collection module and can be connected to other monitoring systems such as environment monitoring, so as to trigger remote alarms such as short messages and telephones.
The foregoing embodiment numbers of the present utility model are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present utility model, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.
Claims (10)
1. An on-duty alarm system, comprising: the switching power supply (1), a circuit breaker (2), a first timer (3), a second timer (4), a reset locking module (6), a switching value acquisition module (7), a first alarm (8), a second alarm (9) and a self-reset button switch (11), wherein the switching power supply (1) provides power for the first timer (3), the second timer (4), the reset locking module (6), the first alarm (8) and the second alarm (9); the first timer (3) is connected with the first alarm (8) and used for controlling the power on-off time of the first alarm (8); the second timer (4) is connected with the second alarm (9) and used for controlling the power on-off time of the second alarm (9); the self-resetting button switch (11) is connected to the first timer (3) and the second timer (4) and is used for resetting the first timer (3) and the second timer (4); the self-resetting button switch (11) is also connected to the resetting locking module (6) and is used for providing a level signal for the resetting locking module (6); the reset locking module (6) is connected to the switching value acquisition module (7) and is used for providing switching value signals for the switching value acquisition module (7).
2. The on-duty alarm system of claim 1, further comprising: intermediate relay (5) and auto-lock button switch (10), wherein, auto-lock button switch (10) with second time-recorder (4) are connected, second time-recorder (4) with intermediate relay (5) are connected, intermediate relay (5) with switching value collection module (7) are connected, auto-lock button switch (10) are used for bypassing control of second time-recorder (4) is intermediate relay (5) and second alarm (9) switch-on power, switching value collection module (7) still are used for gathering switching value signal of intermediate relay (5).
3. The on-duty alarm system according to claim 1, characterized in that the first timer (3) is a first digital time relay and/or the second timer (4) is a second digital time relay.
4. The on-duty alarm system of claim 3, wherein the normally open contact time delay on-time of the first digital display time relay is adjustable within a first predetermined time range and the normally open contact time delay on-time of the second digital display time relay is adjustable within a second predetermined time range.
5. The on-duty alarm system of claim 4, wherein the first predetermined time range is 1 second to 99 hours and the second predetermined time range is 1 second to 99 hours.
6. The on-duty alarm system of claim 1, wherein the normally open contact time delay off time of the reset lockout module (6) is adjustable within a third predetermined time range.
7. The on-duty alarm system of claim 6, wherein the third predetermined time range is 1 second to 10 minutes.
8. The on-duty alarm system according to claim 1, characterized in that the first alarm (8) is an audible and visual alarm and/or the second alarm (9) is an audible and visual alarm.
9. The on-duty alarm system according to claim 1, characterized in that the switching value acquisition module (7) is also used for interfacing with an external monitoring system and/or for remote alarm.
10. The on-duty alarm system of any one of claims 1 to 9, wherein the on-duty alarm system is a single on-duty alarm system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223602919.7U CN219225323U (en) | 2022-12-30 | 2022-12-30 | On duty alarm system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223602919.7U CN219225323U (en) | 2022-12-30 | 2022-12-30 | On duty alarm system |
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| CN219225323U true CN219225323U (en) | 2023-06-20 |
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| CN202223602919.7U Active CN219225323U (en) | 2022-12-30 | 2022-12-30 | On duty alarm system |
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