47 results about "Voltage alarm" patented technology

The invention discloses an intelligent detection and alarm system for an urban rail vehicle, relates to the technical field of rail transit and transportation, and solves the technical problems that an existing monitoring method is difficult to accurately monitor various pressures in the running process of a train, so that the early warning effect is poor, and the safety of the train in the running process is reduced. The data acquisition module is used for acquiring train driving information, voltage data and pressure data according to an acquisition signal; the data processing module is used for generating an early warning pressure range according to the train driving information; generating a pressure alarm signal according to the early warning pressure range and the pressure of the pressure tank, the pressure of the brake pipe and the pressure of the brake cylinder in the pressure data; generating an acquisition signal according to the early warning pressure range, the pressure data and the voltage data; the voltage early warning module is used for generating a voltage alarm signal according to the voltage data; an alarm is given according to the voltage alarm signal; the wind pressure early warning module is used for giving an alarm according to the pressure alarm signal; and the safety of the train in the running process is improved.

An anti-overcompensation gas density monitoring device provided by the present invention comprises a double-layer shell assembly, a transparent observation window assembly and a movement transmission assembly, a first sealed interlayer is formed between an inner shell and an outer shell in the double-layer shell assembly, and a second sealed interlayer is formed between a double-layer transparent window and a meter cover in the transparent observation window assembly. The first sealing interlayer and the second sealing interlayer are equivalent to heat insulation layers, so that natural convection of internal and external air is limited, the speed of transferring external heat into the inner shell is reduced, the relative stability of the internal temperature of the gas density monitoring equipment is favorably maintained, overcompensation of the temperature compensation element caused by rapid change of the external temperature is prevented, and the service life of the gas density monitoring equipment is prolonged. And the phenomenon of false triggering of low-voltage alarm and blocking signals is avoided.

The invention relates to the field of vehicles, in particular to a tire pressure monitoring method, device and equipment, a vehicle and a readable storage medium. The method comprises the steps of obtaining first monitoring data recorded before a vehicle is started, wherein the first monitoring data comprises monitoring data of each tire of the vehicle; judging whether each tire is in a low-pressure state or not based on the first monitoring data; if any tire is in the low-pressure state, a low-pressure alarm instruction is generated, and the low-pressure alarm instruction is used for indicating the vehicle to output a low-pressure alarm signal. According to the invention, the timeliness of vehicle low-voltage alarm is improved.

The invention relates to the technical field of power supply management, and discloses a low-voltage detection circuit, and the circuit comprises a bias current unit which comprises a current mirror structure and is configured to mirror a reference current to generate a tail current; the delta Vth compensation low-voltage detection unit is respectively connected with the bias current unit, reference voltage and power supply voltage, and comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube, a sixth NMOS (N-channel Metal Oxide Semiconductor) tube and a fifth NMOS tube which are sequentially connected in series, and a seventh NMOS tube which is bridged at the drain end and the source end of the sixth NMOS tube; wherein the source electrode of the first PMOS tube is connected with a power supply voltage, the source electrode of the fifth NMOS tube is connected with a tail current, and the grid electrodes of the first PMOS tube, the sixth NMOS tube and the fifth NMOS tube are all connected with a reference voltage; the grid electrode and the source electrode of the seventh NMOS tube are respectively connected with the drain electrode and the source electrode of the sixth NMOS tube, and the drain electrode of the seventh NMOS tube is connected with the power supply voltage; and the input end of the low-voltage alarm signal rectification phase inverter is connected with the grid electrode of the seventh NMOS tube, and the low-voltage alarm signal rectification phase inverter rectifies the detection voltage and outputs a low-voltage detection alarm signal. The circuit is small in area and low in static power consumption. The invention also discloses a chip.

This invention relates to a ground marking and cathodic protection integrated intelligent monitoring system for oil and gas pipelines, comprising a polarized test piece soil reference tube, a self-corroding test piece soil reference tube, a Mark signal sensor, a power supply, and a data acquisition recorder. The data acquisition recorder is equipped with a GPS positioning module and a communication module; the power supply has a low voltage warning function; the data acquisition recorder collects and processes cathodic protection parameters, stray current interference data, and pipeline corrosion rate monitored by the polarized test piece soil reference tube, self-corrosion potential monitored by the self-corrosion test piece soil reference tube, and low-voltage alarm signals output by the power supply, and also processes the electrical signals output by the Mark signal sensor to generate positioning commands that trigger the GPS positioning module to output position signals; this invention achieves high efficiency, high precision, high integration, and high intelligence in oil and gas pipeline operation and maintenance management, improving the accuracy of pipeline corrosion detection and cathodic protection detection and the level of intelligent management.

The invention relates to the technical field of intelligent household appliances, particularly provides an air conditioner control method and an air conditioner, and aims to solve the problem that an existing air conditioner still reports a high-voltage fault after being shut down due to high-voltage alarm and restarted. The control method comprises the steps that the opening value X of a throttling valve and / or the working frequency Y of a compressor are / is obtained when the air conditioner is shut down; the air conditioner is restarted, the opening degree X of the throttling valve is corrected to obtain the corrected opening degree W, and / or the working frequency Y of the compressor is corrected to obtain the corrected frequency V; when the air conditioner runs, the opening degree of the throttling valve is not smaller than the corrected opening degree W and / or the working frequency of the compressor is not larger than the corrected frequency V; wherein W > X and / or V < Y. Through the method, the opening value of the throttle valve and / or the working frequency of the compressor can be corrected, so that the pressure of a refrigerant and the temperature of an indoor heat exchanger are reduced, and the problem that a high-voltage fault is still reported when the air conditioner is started again is effectively solved.

The invention discloses a helmet night vision goggles battery box capable of displaying battery electric quantity and alarming battery low voltage, which comprises a shell, a side plate, a battery bin assembly, an electric quantity indicating assembly, an electrode contact assembly and a turnover locking assembly, the side plate is fixedly connected with the shell, the battery bin assembly, the electrode contact assembly and the turnover locking assembly are respectively arranged on the shell, and the battery bin assembly is fixedly connected with the side plate. The battery box is arranged on the side plate and used for installing a battery, supplying power to the helmet night vision goggles and conducting power-on, power-off, overturning and position locking of the battery box, and the electric quantity indicating assembly is arranged on the side plate and used for detecting the electric quantity of the battery and giving a low-voltage alarm. The night vision goggles are light and compact in structure, small in size, light in weight, high in portability, easy to operate and capable of displaying the electric quantity of the battery and supplying power to the night vision goggles in real time, and warning indication can be given to a user when the voltage of the battery is low; meanwhile, a battery reverse-installation protection structure is designed, so that the contact between the battery cathode and the anode conducting strip can be effectively prevented when the battery is reversely installed, and the night vision goggles are prevented from being damaged.

The application discloses a voltage detection method and device of a single-line power supply transformer substation. The voltage detection method of the single-line power supply transformer substation provided by the embodiment of the application is applied to a power system and is executed by a voltage detection device of the single-line power supply transformer substation. The method comprises the following steps: acquiring parameter information of a power supply transformer substation; determining a state parameter value of the power supply transformer substation according to the parameter information; determining a voltage state of the single-line power supply transformer substation according to the state parameter value of the power supply transformer substation; and outputting a loss-of-voltage alarm signal of the single-line power supply transformer substation according to the voltage state of the single-line power supply transformer substation. The technical scheme of the embodiment of the application determines the voltage state of the single-line power supply transformer substation by acquiring the parameter information of the power supply transformer substation, confirms whether the loss-of-voltage alarm signal needs to be sent, and realizes accurate judgment on whether the single-line power supply transformer substation loses voltage, thereby preventing the single-line single transformer substation from sending the loss-of-voltage alarm by mistake during power supply via a bypass bus and during a related dispatching operation process.

The utility model relates to the technical field of lithium iron phosphate battery low-voltage alarm devices, and provides a communication-free lithium iron phosphate battery low-voltage alarm device, which comprises an equipment shell and a lithium iron phosphate battery, two groups of electric wires are fixedly arranged on the lithium iron phosphate battery, the other ends of the electric wires are fixedly provided with plugs, and the plugs are connected with the equipment shell. And a storage device for preventing a wire of the battery from being pulled apart is mounted on the equipment shell. After the battery is limited through the connecting device, the inserting block is moved to move out of the inserting groove to enter the first limiting groove, so that the L-shaped rotating plate can rotate, the L-shaped rotating plate is rotated to open the groove to expose an internal interface, a wire is wound on the wire winding rod to be stored, and then a plug is connected with the interface. The L-shaped rotating plate is rotated to reset, and the top end of the winding rod is blocked, so that the electric wire is prevented from falling off from the winding rod, and the situation that the electric wire is pulled apart is also avoided while the battery is conveniently connected.

The utility model discloses a smoke environment sudden early warning device which comprises a smoke detection port and a connecting flange, one side of the connecting flange extends out of a detection sampling pipe, the detection sampling pipe is inserted into the smoke detection port, and one side of the detection sampling pipe is provided with an active sampling detection structure; the utility model relates to the technical field of flue gas early warning devices, and in the flue gas environment sudden early warning device, a sampling detection mode is adopted to carry out flue gas environment monitoring, then a detection bypass is arranged on one side of a detection sampling pipe in a communicated mode, and a detection air pump on the detection bypass can be used for controlling the detection bypass to be opened. According to the flue gas detection device, the flue gas is actively extracted from the flue gas treatment pipeline, when the pressure in the flue gas treatment pipeline is reduced, flue gas detection can be carried out in an active gas inlet mode, then an alarm module on the flue gas sensor can be used for giving out an under-pressure alarm, and flue gas leakage is avoided.

The invention provides a voltage alarm method and device applied to a food processor, and electronic equipment, and relates to the field of food processors. The voltage alarm method applied to the food processor comprises the following steps: acquiring a motor voltage; if the motor voltage is greater than a first preset threshold value, increasing a first accumulated value; wherein the first preset threshold value is equal to the maximum input voltage value of the motor; if the motor voltage is smaller than a second preset threshold value, increasing a second accumulated value; wherein the second preset threshold value is equal to the minimum input voltage value of the motor; the first preset threshold value is greater than the second preset threshold value; if the motor voltage is smaller than the first preset threshold value and larger than the second preset threshold value, the first accumulated value and the second accumulated value are reduced; and if the first accumulated value is greater than a first preset accumulated value, or the second accumulated value is greater than a second preset accumulated value, sending a motor voltage alarm.

The application discloses a kind of triaxial acceleration sensor adaptive monitoring method, device, equipment and medium.It includes: obtaining the time domain triaxial vibration voltage signal collected by sensor;When in stable operation condition, the total effective value electric signal energy of triaxial vibration voltage signal in preset time window is calculated, and voltage sensitivity degradation coefficient is calculated;According to voltage sensitivity degradation coefficient and preset physical vibration safety limit value, calculate reference voltage alarm threshold;According to the acceleration data of sensor, calculate first-order difference rate and second-order difference rate, determine whether it is external transient clutter interference now;When it is determined that external transient clutter interference, calculate initial escape lift, build escape attenuation model for calculating dynamic voltage alarm threshold;The sample proportion of triaxial vibration voltage signal exceeding dynamic voltage alarm threshold in short-time fast window and long-time slow window is counted, and the state interval to which it belongs now is set.The accuracy and reliability of triaxial acceleration sensor monitoring can be improved.

The application discloses a substation pressure plate potential detection method and device, an intelligent voltage meter and a storage medium. The method comprises the following steps: in response to a first voice instruction, determining the identification information corresponding to the pressure plate to be measured, wherein the first voice instruction is triggered when a target button in the intelligent voltage meter is pressed and then lifted; determining the preset voltage value corresponding to the upper and lower terminals of the pressure plate to be measured according to the identification information corresponding to the pressure plate to be measured; acquiring the actual voltage value corresponding to the upper and lower terminals of the pressure plate to be measured, and comparing the actual voltage value with the preset voltage value; and in the case that the difference between the actual voltage value and the preset voltage value exceeds a preset proportion threshold, sending voltage alarm information. The application solves the technical problem of low substation pressure plate potential detection efficiency caused by the fact that in the related art, when the pressure plate is detected, the voltage value needs to be manually compared with the table and the standard value every time, resulting in low substation pressure plate potential detection efficiency.

The invention provides an equivalent testing device, method and equipment for a Hall propulsion load of a satellite. The equivalent testing device mainly comprises a thruster equivalent module, a storage and supply equivalent module, a high-voltage switching module and an equipment monitoring method. The thruster equivalent module is used for simulating a Hall thruster unit and realizing the load characteristics of the whole satellite under various working conditions under normal temperature and normal pressure; the storage and supply equivalent module is used for simulating a propulsion control unit load and mainly comprises control signal conditioning and state acquisition of a self-locking valve, an electromagnetic valve and a pressure sensor; the high-voltage switching module is used for connecting a load simulation cabinet cable and a satellite end cable, and a high-voltage alarm sub-module and a storage and supply self-checking sub-module are designed at the same time. The equipment monitoring method is used for collecting equipment state parameters and receiving a control remote instruction. The equipment is used for checking whether the function and the performance of the satellite Hall propulsion system are normal or not, the compatibility and the expansibility are high, and the equivalent requirements of different satellite Hall propulsion systems are met by adopting universal and modular design.

A dual differential contactless current sensor uses a pair of magnetic sensors placed adjacent to a conductor, such as a metallic trace on a printed circuit board, which is conducting electrical current. The ability to detect and measure a tampering magnetic field in such a sensor is provided by a circuit that sums the outputs of the pair of magnetic sensors. The circuit can output an alarm signal, such as a programmable one-bit alarm that indicates when the external magnetic field exceeds a programmed threshold, or an analog voltage proportional to the external field. The alarm signal can be polled by additional circuitry that indicates to the stakeholders that a party is attempting to alter the power measurement.

The present invention is a voltage alarm method, which relates to the technology of the power system and is a method that can issue an alarm in a timely manner when the voltage is abnormal. According to the data of the acquisition device, this method automatically calculates the lower limit value of the current operation and the normal voltage value of the voltage operation, and then calculates the low-voltage alarm value, the unbalanced voltage alarm value, and the negative-sequence voltage alarm value based on the real-time voltage. Combining with the current mutation value, it can automatically adapt the voltage and current judgment values according to the acquired information, will not affect the judgment of the current protection under normal operation conditions, and can issue a voltage alarm in case of abnormality, thus improving the protection reliability.

The invention relates to the technical field of battery monitoring, in particular to a battery low-voltage monitoring method and a battery low-voltage monitoring system using the same, and the method comprises the steps: building a battery equivalent circuit model through a Thevenin first-order RC model, calculating the initial state load voltage of equipment, obtaining three load voltages at different times after a load is started, and determining a stable load voltage; and calculating the voltage of the battery under the first-stage and second-stage fixed resistance loads, and determining the resistance value and the open-circuit voltage of the battery according to the voltage. The maximum working load of the equipment is estimated, the final output voltage under the maximum working load is calculated by combining the battery parameters, and a low-voltage alarm signal is sent out according to the final output voltage and the preset minimum working voltage. The battery voltage can be accurately monitored, the defects of a traditional method are avoided, the equipment reliability is improved, and the service life is prolonged.

The invention relates to the technical field of electrostatic alarm safety helmet devices, in particular to a near-electricity alarm safety helmet adopting thermoelectric power generation and capable of automatically identifying voltage, which comprises an electric field sensor, a safety helmet body, a circuit working state indicator board, an alarm control circuit and a semiconductor thermoelectric power generation power supply, the electric field sensor is arranged at the top of the safety helmet body; the circuit working state indicating board is arranged on one side of the bottom of the safety helmet body; the alarm control circuit is arranged at the inner top of the safety helmet body; and the semiconductor thermoelectric power generation power supply is connected with the circuit working state indicating board. The problem that a power supply of a traditional near-electricity alarm device needs to be charged for many times or a battery needs to be replaced after being used for a period of time is solved; accurate measurement of the electric field intensity of the high-voltage line is realized, the measurement efficiency and precision are improved, the problems of tedious operation and large operation error during manual adjustment are effectively solved, and the accuracy of high-voltage alarm is ensured.

The invention discloses a battery water inflow detection control method, a memory and a processor. The battery water inflow detection control method comprises the following steps: detecting whether the insulation resistance to ground of a battery is abnormal or not; detecting whether the voltage of the battery is abnormal; detecting whether the temperature of the battery is abnormal; carrying out weighted fusion calculation according to at least two of the ground insulation resistance alarm signal Dins, the voltage alarm signal Dvol and the temperature alarm signal Dtemp to obtain the water inflow probability of the battery; and when the calculated water inflow probability of the battery is within the water inflow threshold range, judging that water enters the battery and giving a water inflow alarm. Therefore, at least two of the insulation resistance to ground, the voltage and the temperature of the battery are used as factors for judging whether water enters the battery or not, so that false alarm of water entering of the battery caused by sensor failure or aging of a single factor is effectively avoided through multi-dimensional information fusion, and problems can be found in the early stage of water entering; and thermal runaway and battery pack fire are avoided.

A volt pen 1 having a fuse holder claw clamp 4 attached to the outer surface of the pen’s body 2 and a fuse pry tool 6 which may be fixed to the end of removable battery cap 12 or the end of a rotatin

The invention relates to a power supply management method based on an automatic load rejection strategy. The method comprises the steps of collecting a storage battery terminal voltage as a sampling voltage; when the sampling voltage is smaller than an under-voltage alarm voltage threshold value, under-voltage alarm is carried out, and meanwhile, a power supply of current task equipment is cut off according to a load rejection sequence; judging whether the sampling voltage is smaller than an under-voltage protection voltage threshold value or not; when the sampling voltage is reduced to be smaller than the under-voltage protection voltage threshold value, emergency alarm is carried out, and power supplies of all current task equipment are cut off; after the sampling voltage is smaller than the under-voltage protection voltage threshold for a certain duration, cutting off the power supply of all key equipment; and when the voltage rises to the protection cut-off recovery threshold value, switching on the power supply of the key equipment. Based on a simple voltage judgment method, the automatic load rejection strategy is used for power management, the operation time of passengers is saved, the utilization rate of electric energy is increased, the use condition of a power grid is improved, and safe and reliable operation of the system is further guaranteed.

The invention relates to the technical field of millimeter wave radar power supply and power consumption detection, in particular to a low-cost millimeter wave radar power supply system electric quantity detection method. Filtering the battery voltage signal and realizing stable sampling; establishing a mapping model of voltage and electric quantity and performing dynamic judgment; according to the electric quantity grade, driving an indicating lamp to realize visual display and provide an undervoltage alarm; and the average energy consumption is reduced through a low-power-consumption detection mode. According to the method, an analog-to-digital conversion channel of a single-chip microcomputer is used for obtaining battery voltage after voltage division, and stable input is obtained by combining hardware filtering and a mode of removing abnormal values through multiple times of sampling; when the electric quantity is in different grades, the indicating lamp outputs according to different preset stroboscopic strategies, and the stroboscopic frequency corresponding to the low electric quantity grade is higher than the medium electric quantity grade; and when the under-voltage threshold is triggered, a control signal is output to link energy-saving or shutdown protection, so that the cost, the stability and the safety are considered.

The invention discloses a battery alarm method, equipment and device, and the method comprises the steps: firstly obtaining the current battery monitoring data of a target battery pack, the current battery monitoring data comprises the battery pack voltage, the battery pack current, and the single voltage of each single battery, and then obtaining the battery alarm data of the target battery pack based on the battery pack current and the single average voltage; the method comprises the steps of determining a battery state of a target battery pack, then determining a voltage alarm threshold value corresponding to the battery state based on a preset corresponding relation, finally comparing target monitoring data with the voltage alarm threshold value, and giving an alarm according to the comparison, and the target monitoring data comprises a battery pack voltage or a target monomer voltage. The voltage alarm threshold value is determined based on the battery state, that is, different battery states correspond to different voltage alarm threshold values, and different voltage alarm threshold values are adopted for alarming under different battery states, so that the alarm accuracy can be improved, the service life of the battery can be prolonged, and the safety of the battery can be improved.

The invention discloses an early warning and monitoring device and method for heteropolar voltage of protection outlet pressing plates of a transformer substation, and relates to the technical field of transformer substations or other related fields, and the device comprises a digital collection unit which is used for collecting voltage to ground at the upper end and the lower end of each protection outlet pressing plate in a protection device of the transformer substation, voltages to ground at the upper end and the lower end are voltage analog signals; the A / D conversion unit is used for converting the voltage to ground at the upper end and the lower end into voltage digital signals; the programmable controller analysis processing unit is used for executing a heteropolar voltage alarm judgment strategy, and the heteropolar voltage alarm judgment strategy comprises the step of outputting an alarm signal under the condition that the voltage to ground at the upper end and the lower end is heteropolar voltage or the voltage to ground at the upper end is zero; and the display alarm unit outputs an alarm prompt based on the alarm signal. According to the invention, the technical problem that the working efficiency is low when heteropolarity voltage monitoring is carried out on the transformer substation protection outlet pressure plate in the prior art is solved.

The utility model relates to the technical field of equipment monitoring, in particular to an electric heat tracing equipment monitoring system and a to-be-heat-traced equipment system. The electric heat tracing equipment monitoring system comprises a first temperature sensor, a current transformer, a voltage transformer, a data processing module and an alarm module. The first temperature sensor, the current transformer and the voltage transformer are respectively used for monitoring the first working temperature, the working current and the working voltage of the electric tracing band in real time; the data processing module comprises a first processing module, a second processing module and a third processing module. Through the above arrangement, the data processing module analyzes and processes the first working temperature, the working current and the working voltage of the electric tracing band and then transmits the first working temperature alarm information, the working current alarm information and the working voltage alarm information to the alarm module, so that comprehensive real-time monitoring and fault diagnosis of the electric tracing system are realized. And the reliability and the safety of the system are improved.

1. Name of the design product: current limiting module. 2. Use of the design product: to limit the current when the battery triggers over-voltage alarm or charging over-current to protect the battery. 3. Design points of the design product: in shape. 4. Picture or photo that best shows the design points: perspective view 1.

The invention discloses a line detection system, an electronic device and a method, and relates to the field of electronic circuits, a power supply assembly is configured to output a preset power supply voltage, and a main detection assembly comprises a first detection circuit and a second detection circuit. The first detection circuit is configured to obtain a first detection result according to the first digital voltage obtained in the first detection circuit, and the second detection circuit is configured to obtain a second detection result according to the second digital voltage obtained in the second detection circuit; the input end of the recheck supplementary circuit is electrically connected with the output end of the power supply assembly, and the recheck supplementary circuit is configured to determine a fault line according to the first detection result, the second detection result and a third detection result in the recheck supplementary circuit when the comparison results of the first detection result and the second detection result are different. According to the invention, the problems of low voltage alarm detection reliability, weak anti-interference capability and single alarm mechanism in the prior art are solved, and redundancy detection and accurate judgment of voltage alarm are realized through three independent detection lines and an intelligent cooperative judgment mechanism.

The invention provides a moving ring alarm device for a communication base station and a use method thereof, and relates to the technical field of monitoring, and the device comprises a DC / DC conversion module which is used for being connected with a storage battery of the communication base station, converting a first DC of the storage battery into a second DC, and providing the second DC for a voltage detection control panel; the voltage detection control panel comprises a first voltage detection unit used for detecting a first direct current voltage of a switching power supply system of the communication base station and giving out a mains supply outage alarm signal in response to the fact that the first direct current voltage is lower than a first threshold value, and a second voltage detection unit used for detecting a second direct current voltage of a storage battery of the communication base station and giving out a mains supply outage alarm signal in response to the second direct current voltage. And in response to the second DC voltage being lower than the second threshold, sending a storage battery low-voltage alarm signal. The base station battery is used for providing direct current for the moving ring alarm device, two kinds of direct current voltage of the base station are used for detecting base station mains supply outage and storage battery low voltage alarm, and therefore the device is small in energy consumption, simple in structure, low in cost and small in size.

The invention relates to a control method and system for a rectification circuit in a light load state, and the method comprises the steps: additionally adding a preset negative bias to a three-phase current sampling value when the rectification circuit is in a light load operation mode, enabling the sum of the sampling value and the bias value of each phase to be smaller than a given value, and enabling the three-phase waves to be symmetrical. According to the invention, the negative bias is increased by sampling the input current during light load, so that the three-phase wave sending duty ratio difference caused by the hardware difference of the three-phase current sampling circuit is reduced. The finally presented effects are that the three-phase wave sending duty ratio is more average, the error of input voltage sampling is eliminated, false triggering of system input undervoltage or overvoltage alarm is avoided, and the stability of the system is improved.

The utility model discloses a voltage monitoring alarm circuit of an atmospheric transmissometer transmitter, which comprises a voltage dividing unit, a voltage stabilizing and current limiting unit, a filtering unit, a chip NE555, an auxiliary adjusting unit, an alarm unit and a protection unit, the other end of the voltage dividing unit is connected with one end of the voltage stabilizing and current limiting unit, the other end of the voltage stabilizing and current limiting unit is respectively connected with a THR pin end and a TRI pin end of the chip NE555, one end of the auxiliary adjusting unit is respectively connected with the other end of the voltage stabilizing and current limiting unit and the TRI pin end of the chip NE555, one end of the alarm unit is connected with an OUT pin end of the chip NE555, and the other end of the alarm unit is connected with an OUT pin end of the chip NE555. One end of the filtering unit is connected with the CON pin end of the chip NE555; when the voltage of the monitored end of the atmospheric transmissometer is monitored to be lower than the voltage alarm threshold value, the chip NE555 controls the alarm unit to give an alarm.