718 results about "Gas detector" patented technology

The invention discloses an automatic calibration method and system for a mining laser gas detector, and relates to the technical field of instrument calibration. The method comprises the following steps: dividing detection beam parameters into measurement beam parameters and reference beam parameters; enabling the measurement light beam parameter to penetrate through the to-be-measured gas area to obtain a measurement signal, and enabling the reference light beam parameter to penetrate through the reference gas chamber to obtain a reference signal; performing photoelectric conversion calculation on the reference signal to obtain a gas concentration detection value; the gas concentration detection value is compared and analyzed with a reference data value according to the central wavelength position of the mining laser gas detector, and a calibration unit is activated according to a comparison result; and automatically correcting the mining laser gas detector, generating a correction parameter set, calculating a measurement signal, and generating a concentration value of the gas to be detected. The technical problems of low calibration efficiency and unstable calibration precision of the mining laser gas detector in the prior art are solved, and the technical effects of realizing automatic calibration of the mining laser gas detector and improving the calibration efficiency and precision are achieved.

The invention provides an intelligent fire prevention and control fire-fighting management system and method for a lithium battery energy storage power station, and relates to the technical field of data processing, and the method comprises the steps: arranging a multi-level temperature sensor, a gas detector and a smoke detector in and outside a battery module, and collecting and forming multi-source monitoring data; performing time sequence rate analysis, and if a preset condition is met, generating early warning data; in combination with sensor matrix distribution in the battery module, spatial cross comparison is executed to obtain abnormal positioning data, and false anomalies are eliminated through multi-point consistency verification; generating a directional processing instruction corresponding to the injection unit, and setting injection data in the processing instruction; the spraying unit is controlled to release an atomized fire extinguishing medium, so that the medium forms a permeation flow field in the gaps of the battery cells, and treatment feedback data is acquired and formed; performing trend analysis, and if the trend is not enough to recover to the preset safety range, generating a secondary processing instruction; according to the invention, the autonomy and accuracy of fire control management are improved.

The invention discloses a gas detector for air pollution detection, and belongs to the technical field of gas detection.The gas detector comprises an outer shell and an inner shell which are arranged in a sleeved mode and used for detecting gas to be detected; the adjusting mechanism is used for adjusting the height and angle of the detection mechanism; wherein an inner air inlet cavity is formed in the inner shell, and an outer air inlet cavity is formed between the outer shell and the inner shell; a sensor is mounted on the inner wall of the inner air inlet cavity; an exhaust pipe communicated with the inner air inlet cavity is arranged on the outer shell, and a fan is mounted in the exhaust pipe; a rotating ring is rotationally arranged on the radial inner wall of the outer shell and used for adjusting the opening and closing states of the inner air inlet cavity, the outer air inlet cavity and the exhaust pipe. The inner gas inlet cavity is a core detection area, a sensor is installed to make direct contact with to-be-detected gas, and the outer gas inlet cavity is a split-flow filtering area and serves as a temporary storage area of follow-up impurities. The exhaust pipe is communicated with the inner air inlet cavity, the fan is arranged in the exhaust pipe, and the fan provides active air suction and exhaust power and supports reverse blowing and cleaning of residual impurities in the cavity.

The invention belongs to the related field of gas detection devices, and discloses a photoacoustic gas chamber equipped with a cantilever type micro-sound sensor and application of the photoacoustic gas chamber. The axial main body part of the photoacoustic gas chamber is designed to be cylindrical and can be provided with elements such as a gas inlet, a gas outlet, an optical window and a reflecting mirror; wherein the optical window is used for emitting laser into the gas chamber to excite the gas to be detected, the reflecting mirror is used for reflecting the laser for multiple times in the gas chamber, and the cantilever type micro-sound sensor is used for correspondingly bending when the sound pressure in the gas chamber changes, so that sound signals generated after the gas to be detected generates excitation are collected. The arrangement mode, the working mechanism and the like of the components are further optimized and improved. According to the invention, a non-resonant compact photoacoustic gas chamber can be obtained, the advantages of high precision, high sensitivity and the like of a cantilever type micro-acoustic sensor can be fully exerted, and the whole gas chamber can effectively resist vibration noise caused by environmental interference.

An indoor air cleaning system with a networking mechanism is disclosed and applied in an indoor field (A) for detecting and cleaning air pollution completely. A real-time air quality monitoring in the indoor field (A) is achieved by arranging plural gas detectors (A), at least one gas molecule control hardware device (2), at least one air conditioning device (3) and a networked cloud computing service device (4) in the indoor field (A) and forming an intelligent linked system by the arranged gas detectors (1) in an outdoor filed and the indoor field (A). Meanwhile, the air pollution in the indoor field (A) is also detected and intelligently compared with an ambient air quality status, and an air guiding volume of an air guiding fan (21) is instantly controlled according to the air quality. Whereby an energy saving benefit of the effective controlling operation of the purification device is achieved.

The invention discloses a copper wire annealing temperature gradient control device which comprises a box body, and an inert gas supply source, an induction heating power supply, a control unit and a cooling water supply source are arranged outside the box body. The front end of the box body is provided with a door body, a left hinge and a right lock catch. A connecting seat is arranged at the bottom in the box body, a mounting plate is arranged at the middle upper part of the box body, and a vertical guide rail column is detachably mounted between the connecting seat and the mounting plate; clamping structures are arranged at the upper and lower ends of the base; and copper wires are detachably mounted on the clamping structures. And two ends of the electromagnetic heating coil penetrate out of the box body and are connected with an induction heating power supply. And the top of the base is connected with the take-up and pay-off equipment through a stay wire. Two temperature measuring assemblies are arranged on the box wall and located above and below the electromagnetic heating coil respectively. The lower end of the side wall of the box body is connected with an inert gas supply source, and the upper end is provided with an exhaust pipe with a valve and an online gas detector. The side wall of the box body is connected with an inclined bent pipe and an emptying pipe with a valve, and a water inlet pipe penetrates through the side wall of the box body and is connected with the box body.

The invention provides a mining gallium nitride gas sensor which comprises a main box body, a gas inlet cover is arranged on the bottom face of the main box body, and a PLC main board loaded with a gallium nitride chip is installed in the main box body; the gas detector comprises a shell column, and the shell column is installed in the middle of the bottom face of the main box body and located in the gas inlet cover; an inner blowback part for cleaning the filtering part is arranged in the connecting screw pipe, and an outer blowback part for cleaning the air inlet cover is arranged outside the shell column; identification assemblies are symmetrically arranged on the two sides of the main box body; the identification assemblies rotating upwards are contained on the two sides of the main box body so as to identify the gas detection position. The identification assembly rotating downwards encloses the outer part of the air inlet cover so as to carry out closed calibration and maintenance identification; and a hoisting mechanism. The surface of the air inlet cover and the interior of the filtering part can be synchronously cleaned, and dust and impurities are thoroughly removed; the closed calibration area is formed through automatic butt joint of the side enclosure cover, and a temporary closed environment does not need to be built manually.

The utility model provides a toxic gas detector control circuit capable of resisting electromagnetic interference, which comprises a power supply voltage regulation circuit, a temperature signal acquisition circuit, a sensor voltage regulation circuit, a sensor acquisition control circuit and a gas detector main control circuit which are in power supply connection. The gas detector main control circuit is in control connection with the 485 communication circuit, the acousto-optic prompt circuit, the LED state display circuit and the digital display screen, the gas detector main control circuit is in communication connection with the sensor acquisition control circuit, and the sensor acquisition control circuit is in control connection with the gas signal acquisition circuit and the temperature signal acquisition circuit. A TVS (Transient Voltage Suppressor) tube, a common mode inductor and a diode are arranged in the power supply voltage adjusting circuit; and a TVS tube and a diode are also arranged in the gas detector main control circuit. The poisonous gas detector has the beneficial effects that the anti-electromagnetic interference capability, the reliability and the stability of the poisonous gas detector when the poisonous gas detector is independently used are greatly improved.

Systems and methods are provided for a portable gas detector having an indicator configured to display an indication, such as a color indication, to a user of the portable gas detector, where the indication represents a particular gas sensor configuration setting. The portable gas detector may have one or more gas sensors configured to detect a plurality of gas species, and a controller configured to control configuration settings of the one or more gas sensors. The indication provided to the user allows the correct portable gas detector to be effectively selected for each individual task without the need for the user to rely on potentially inaccurate physical indicia or manual inspection device settings.

The application pertains to a portable emission monitoring system comprising a gas detector comprising a first and second sample port. A first tubing connects the first sample port to a first area to be monitored for a first gas and a second tubing connects the second sample port to a second area to be monitored for a second gas. One or more pumps are connected to the first tubing and the second tubing. The one or more pumps draw gas from the first area and the second area to the first sample port and the second sample port. The detector measures the concentration of drawn gas from the first area in the first sample port and also measures the concentration of drawn gas from the second area in the second sample port. A portable skid may be employed to mount the gas detector and the one or more pumps.

The utility model discloses an engineering machinery tail gas detector which comprises a detector body, the detector body is communicated with an L-shaped pipe, the top of the detector body is fixedly connected with a shell, a rotating pipe joint is embedded in the inner wall of one end of the shell, the L-shaped pipe is communicated with one end of the rotating pipe joint, and the L-shaped pipe is communicated with the other end of the rotating pipe joint. The other end of the rotating pipe connector communicates with a rotating pipe, and one end of the rotating pipe penetrates through the shell and is fixedly connected with a rotary knob. According to the utility model, the tail gas capturing probe is inserted into the exhaust pipe of the engineering machinery to collect tail gas, the tail gas is conveyed to the detector body for detection through the gas inlet pipe, the rotating pipe, the rotating pipe joint and the L-shaped pipe, and in addition, the rotating pipe can rotate around the axis of the rotating pipe by rotating the knob, so that the gas inlet pipe is wound, and the gas inlet pipe and the probe are convenient to recycle; and the probe can be inserted into the cylinder during recovery, so that the extension and storage of the pipeline and the probe on the tail gas detector are facilitated.

The invention relates to the technical field of mainboard testing tools, in particular to a gas detector mainboard testing tool which comprises a testing table, a controller is connected to the end face of the testing table, a centering fixing structure is connected to the end face of the controller, and a movable touch panel structure is connected to the centering fixing structure. The end face of the test board is connected with a tester through a connecting seat, the centering fixing structure comprises a connecting bottom plate, and the connecting bottom plate is connected to the end face of the controller. Therefore, an electric telescopic rod and a driving motor in the middle fixing structure and the movable touch panel structure can be used for accurately and repeatedly positioning and fixing the detector main board and enabling an electric guide column to be in close contact with an electric element on the detector main board through a transmission structure, and the probability that the detector main board is damaged when the detector main board is tested is reduced. The accuracy of the detector mainboard during testing is influenced by external factors.

A leak detecting apparatus (1) for detecting a leak and determining the size of the leak in a suture repaired site (5) of a hollow organ (3), for example, a stomach, in a cavity (7), for example, the peritoneal cavity of a subject comprises a first insufflator (12) for insufflating the hollow organ (3) with a first gas, and a second insufflator (14) for insufflating the cavity (7) with a second gas. A gas detector (18) is provided for detecting the concentration of the first gas in gases exhausted from the cavity (7) through a communicating conduit (35). A flow meter (25) monitors the flow rate of the first gas to the hollow organ (3). First and second pressure sensors (15) and (16) monitor the static pressure of the first and second gases in the hollow organ (3) and the cavity (7), respectively. The apparatus (1) is operable in a first mode and a second mode. In both the first and second modes of operation a microprocessor (50) controls the second insufflator (14) for maintaining the pressure in the cavity (7) at a relatively low predefined pressure, and the first insufflator (12) for maintaining a constant predefined pressure differential between the pressures in the hollow organ (3) and the cavity (7) of approximately 7 mmHg. In the first mode the microprocessor (50) determines the size of the leak as a function of the pressure differential and the concentration of the first gas in the exhaust gases. In the second mode of operation the microprocessor (50) determines the size of the leak as a function of the pressure differential and the flow rate of the first gas to the hollow organ (3) with the hollow organ (3) sealed apart from the sutured site (5).

To provide a portable gas detector that solves the inconvenience of connecting and storing hoses in conventional gas detectors. [Solution] The portable gas detector is equipped with a winding unit and a fall prevention unit 200. By winding the hose around the outside of the winding roller, the hose can be neatly arranged during use. Furthermore, the provided fall prevention unit 200 allows the device to be held securely in the user's hand, effectively preventing the device from falling.

The utility model discloses a miniature gas sensor module used on a gas detector. The miniature gas sensor module comprises an elastic clamping piece, a miniature sensor, a main body, a small adapter plate and a PCBA (Printed Circuit Board Assembly) plate, the micro sensor is arranged in the main body; the elastic clamping piece is clamped into the main body and is used for fixing the micro sensor; the micro sensor is provided with a side surface contact connection conduction part; the small switching board is arranged in one side of the main body and arranged on the PCBA board, the small switching board is provided with an elastic piece type connector and a connecting interface, the elastic piece type connector is used for being connected with the side face contact connection conduction part of the micro sensor, and the connecting interface is used for being connected with the PCBA board through current; the PCBA board is arranged at the bottom of the main body, a horizontal patch pin header connector is further arranged on the PCBA board, and the horizontal patch pin header connector is connected with the connecting interface. According to the utility model, manual welding is not needed, a patch type is adopted, and a connecting lead is not used in the middle.

The application discloses a kind of based on target tracking algorithm's gas detection operation compliance identification method, belong to gas detection technical field.The method includes: high-definition video camera is arranged in the methane detection area of mine, real-time acquisition video data in methane detection area and image is preprocessed;By YOLO target detection method, the gas detector in the methane detection area in video is identified;If detecting that gas detector hand holds gas detector and arrives specified methane detection area on time, then it is judged as compliance operation, otherwise it is judged as non-compliance operation;After verifying that gas detector hand holds gas detector arrives specified methane detection area on time, the gas detection operation of scene is tracked in real time by CSRT target tracking algorithm;Then with standardized operation is compared, if gas detection operation meets standardized operation, then it is judged as compliance operation, otherwise it is judged as non-compliance operation.The application can improve the reliability and safety of gas detection operation, reduce the safety risk brought by illegal operation or non-operation.

The application provides a kind of for coal mine stoping working face goaf gas detection communication device, including side sealing block and plugging wall, detection communication pipe, it is arranged in the through hole inside the plugging wall;And pipe plug, detachably arranged in one end of the detection communication pipe, when needing to determine the gas in stoping working face goaf, pull out pipe plug, connect detection communication pipe with gas detector and carry out gas detection, pipeline support assembly, including lateral support assembly and horizontal support assembly, pipeline support assembly is arranged at the junction of the communication pipe both sides and plugging wall.The application passes through the through hole of the plugging wall of detection communication pipe, when needing to determine the gas in stoping working face goaf, pull out pipe plug, connect detection communication pipe with gas detector, can determine the gas composition in this area, greatly improves the gas detection efficiency in stoping working face goaf, and has important significance for improving the management level of mine fire prevention.

The utility model discloses a kind of ultraviolet light solidification oxygen inhibition inhibiting device, comprising: horizontal transport processing platform, suit sealing support, a pair of hydraulic sealing door, ultraviolet light solidification structure and oxygen inhibition inhibiting structure, the utility model relates to ultraviolet light solidification technical field, full-sealing inert environment control system, adopt double hydraulic sealing door and gas replacement device linkage, realize the oxygen content≤50ppm oxygen-free environment by flow valve accurate control, cooperate with gas detector real-time monitoring, effectively inhibit oxygen inhibition effect, significantly improve the solidification quality of light-cured material surface layer;Multi-dimensional motion adjusting mechanism, longitudinal and transverse two-way positioning system constructed by three-stage screw module, cooperate with the vertical lifting assembly of electromagnetic drive, realize the repeat positioning accuracy of ±0.05mm of spray head group, can be compatible with 50-300mm width range of workpiece adaptive processing.

The utility model relates to the technical field of gas detection, in particular to a portable gas detector, which is provided with a connecting mechanism and an extending mechanism, so that air which cannot enter and is poisonous closed space can be detected in a gas detection process, and choices of use environments are increased; comprising a detection mechanism; the device further comprises an air supply mechanism, a taking mechanism, a connecting mechanism and an extension mechanism, the air supply mechanism is installed on the detection mechanism, the taking mechanism is installed on the detection mechanism, the connecting mechanism is placed in the detection mechanism, and the extension mechanism is installed on the connecting mechanism. The detection mechanism carries out detection, the air supply mechanism carries out air supply, the taking mechanism carries out taking, the connecting mechanism carries out connection, and the extension mechanism carries out extension.

1. Name of the product in this design: Mobile phone stand (wireless charger with odor concentration detection). 2. Purpose of this design: It can be used as an alcohol detector or other gas detector, and also has wireless charging and magnetic functions. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: Design 5 3D diagram. 5. Design 5 is designated as the basic design.

The invention discloses an emergency exhaust system for chemical leakage, relates to the technical field of emergency exhaust of chemical supply equipment, and is used for solving the problem that a PLC module is corroded by acid gas of CDM equipment. The system comprises a shell, a gas detector, an alarm device, an acid absorption assembly, a sweeping mechanism, an air blowing assembly and a processing device. The gas detector detects acid gas and gives an alarm and starts the acid absorption assembly when the acid gas exceeds the standard, the air draft pump exhausts the acid gas through the connecting pipe and the straight pipe, and the elastic capillary hose on the straight pipe can penetrate into a gap of an element to absorb the acid gas. The sweeping mechanism drives the straight pipe to reciprocate to expand the absorption range; meanwhile, the sweeping mechanism drives two sets of fans of the blowing assembly to rotate oppositely through the transmission mechanism, acid gas is concentrated in the middle, and acid absorption is facilitated. The treatment device purifies acid gas through a multi-stage filter element. The system realizes efficient absorption and treatment of acid gas, effectively protects the PLC module, avoids equipment failure, is ingenious in structure and energy-saving, reduces environmental pollution, and has good practicability and economical efficiency.

The utility model relates to the technical field of frequency distributors, and discloses a pumping type laser gas detector which comprises a detector, an extension assembly is arranged at the bottom of the detector, and a telescopic assembly is arranged at one end of the extension assembly. According to the technical scheme, the length between the telescopic assembly and the detector is conveniently increased through the arranged extension assembly, so that use is more convenient, the telescopic assembly is used for conveniently detecting a narrow leakage area or an area which is not prone to probing, the leakage measuring position is more accurate, and data are more accurate.

The traction motor (10) features: a fluid-tight stator chamber (38) with a motor stator (30), wherein the stator chamber (38) has a fluid inlet (36) and a fluid outlet (37), and a rotor chamber (28) with a motor rotor (20), wherein the rotor chamber (28) has an air inlet (26) and an air outlet (27). The examination order (100) indicates: a test gas source (102) with a detectable test gas (103) which is fluidically connected to the stator chamber fluid inlet (36) via a fluidic inflow control (105), a switchable outlet valve (110) connected to the stator chamber fluid outlet (37), a test gas detector (112) that can detect the test gas (103) and that is fluidically connected to the rotor chamber air outlet (27), and a vacuum gas pump (114) through which rotor chamber air is pumped or drawn from the rotor chamber (28) through the rotor chamber air outlet (27) to the test gas detector (112), and an electronic test control (120) which is connected via signal links to the test gas inflow control (105), the stator chamber outlet valve (110) and the test gas detector (112). The electronic test control (120) generates the following process steps: Introducing the test gas (103) from the test gas source (102) into the stator chamber (38) such that the stator chamber gas pressure (p38) is at a defined above-atmospheric test gas overpressure (ps), and Activating the gas pump (114) and the test gas detector (112), thereby quantitatively detecting leakage test gas flowing into the air-filled rotor chamber (28).

The utility model provides an auxiliary sampling type gas detector which comprises an exhaust mechanism, a gas conveying assembly and a gas detection mechanism, the input end of the exhaust mechanism is connected with an external to-be-sampled gas storage device, and the output end of the exhaust mechanism is communicated with one end of the gas conveying assembly; the other end of the gas conveying assembly communicates with the gas inlet end of the gas detection mechanism. The air pumping and exhausting mechanism comprises an air storage cylinder, a push-pull arm, an outer cylinder and an air pumping and exhausting adjusting mechanism, the air storage cylinder is arranged in the outer cylinder, and one end of the push-pull arm extends into the air storage cylinder and is connected to a piston; an input air hole is formed in the end, away from the push-pull arm, of the outer cylinder and serves as the input end of the exhaust mechanism, and an output air hole is formed in the side wall of the outer cylinder. Gas in the gas storage cylinder can be output from the output gas hole by adjusting the position of the conversion gas hole, so that the detection accuracy is improved; the flow direction of the gas sample can be flexibly switched through the conversion column, a user can adjust the flow direction of the sample according to needs through operation of the rotating head, and the use flexibility of the equipment is improved.

This invention proposes a capacitive wireless charging portable gas detector, comprising a charging base that matches the portable gas detector. The charging base contains a power supply circuit, a control circuit, and a first coupling electrode plate. Both the power supply circuit and the control circuit are connected to the first coupling electrode plate. The control circuit generates a high-frequency PWM signal as a drive signal for the first coupling electrode plate. The portable gas detector contains a second coupling electrode plate, a charging circuit, and a battery. The second coupling electrode plate matches the first coupling electrode plate, and the closer-proximity second coupling electrode plate forms a capacitor structure with the first coupling electrode plate. The second coupling electrode plate induces a charge and is connected to the battery through the charging circuit. This invention utilizes coupling electrode plates instead of inductors, eliminating the need for large internal inductance. The coupling electrode plates inside the portable gas detector are separate and cannot form a capacitor, reducing the difficulty of intrinsically safe explosion-proof design, improving device safety, and extending the service life of the portable instrument.

The invention discloses a GIS equipment gas leakage detection and under-pressure plugging system and a use method thereof, the GIS equipment gas leakage detection and under-pressure plugging system comprises a glue injection machine and a special-shaped suction cup, the special-shaped suction cup and the glue injection machine are connected through a glue injection hose, and the SF6 gas detector is used for detecting gas leakage points; wherein the special-shaped suction cup comprises a groove formed in the inner side, a rubber edge is arranged on the periphery of the groove, a glue injection hole and a vent hole are formed in the surface of the special-shaped suction cup, and a binding ribbon and a pressure gauge are further arranged on the special-shaped suction cup; the gel injection machine comprises a microprocessor, a gel storage bag, a micro motor, a display screen, a storage unit and a rechargeable power supply; the SF6 gas detector comprises an infrared imaging unit and a gas acquisition and identification unit; the method is applied to the detection and electrified plugging of the special-shaped gas leakage points of the GIS equipment, and solves the problems that the detection means of the existing plugging method are deficient, the GIS equipment is damaged, and the irregular gas leakage points of the GIS equipment are difficult to effectively plug.

The utility model relates to the technical field of dryers, in particular to an electromagnetic induction dryer which comprises an electromagnetic induction drying cylinder. The device further comprises an emergency exhaust outlet, an exhaust pipe, a mounting frame, a gas detector exhaust pipeline I, an exhaust pipeline II, a harmful gas storage tank, an air pump and a fan; the emergency exhaust outlet is formed in the surface of the upper end of the electromagnetic induction drying cylinder; if abnormal conditions such as over-high temperature or harmful gas generation occur, the emergency exhaust outlet can be opened, internal gas is allowed to enter the mounting frame through the exhaust pipe, the fan is started, gas flow is accelerated, then the gas is analyzed through the gas detector, and if the gas detector does not detect harmful substances, the emergency exhaust outlet can be opened. If harmful substances are detected, the gas is exhausted to the external environment through the exhaust pipeline I, if the harmful substances are detected, the harmful gas is fed into the harmful gas storage tank through the exhaust pipeline II under the action of the air pump for safe storage, and the valve I can be used for controlling the flow direction of the gas to ensure that the device runs as required.

The application discloses an online checking method and system for an SF6 gas detector, and the method comprises the following steps: controlling a standard gas source to output an asymmetric triangular concentration waveform, wherein the rising rate of the waveform is not equal to the falling rate; collecting real-time concentration of the detector; drawing rising and falling response curves with standard concentration as the horizontal coordinate and real-time concentration as the vertical coordinate; calculating the deviation area between the two curves and an ideal straight line; if the area ratio is not greater than a dynamic threshold, extracting all intersection points of the two curves and sorting them; calculating the algebraic area of the region surrounded by adjacent intersection points to generate a surrounding area symbol string; and determining the fault type according to the intersection point number parity and zero value, intersection point horizontal coordinate interval dispersion degree and symbol string distribution according to the topological classification rule. The asymmetric excitation fully exposes the adsorption-desorption asymmetric characteristics of the sensor, and the response curve topological characteristics realize online identification and classification of baseline separation, translation drift, response lag, nonlinear superposition and noise jamming and the like.

The utility model provides an SCR denitration ammonia spraying device. The SCR denitration ammonia spraying device comprises a flue, and an ammonia spraying grid, a catalytic bed layer and an air pre-heater are sequentially arranged in the flue from top to bottom; a first gas detector and a second gas detector are respectively arranged on two opposite sides above the ammonia spraying grid; a third gas detector and a fourth gas detector are respectively arranged on two opposite sides below the catalytic bed layer; ammonia gas inlets in the two opposite sides of the ammonia spraying grid are connected with an ammonia gas supply device, the ammonia gas inlet in one side of the ammonia spraying grid is connected with a first standby valve through a first main valve, and the ammonia gas inlet in the other side of the ammonia spraying grid is connected with a second standby valve through a second main valve. According to the device disclosed by the invention, the accurate and real-time regulation and control of the ammonia spraying amount are realized through the matched use of the equipment, and the defect that the denitration effect is poor or ammonia escapes due to the fact that the ammonia spraying amount is difficult to adjust accurately in time when flue gas components fluctuate in a traditional ammonia spraying mode is overcome.

To provide a gas detector that can easily detect mixed gases with high accuracy, and that can calibrate the gas sensor without using actual gas. [Solution] The system is configured to include a sensitivity setting unit 121 that sets the sensor sensitivity of the gas sensor 110 for a gas to be measured, selected from among multiple types of mixed gases in which the first to nth gas components (where n is an integer of 2 or more) are mixed in different proportions, based on composition data relating to the gas to be measured and sensitivity data relating to the sensor sensitivity of the gas sensor 110 for each of the first to nth gas components, and a calibration curve data acquisition unit 122 that acquires calibration curve data for the gas to be measured based on composition data relating to the gas to be measured and reference calibration curve data for each of the first to nth gas components.