90 results about "Calibration gas" patented technology

In order to allow an analyzer to be calibrated or a sampling channel to be purged without removing a sampling probe from a sampling location, provided are a sampling channel through which an exhaust gas from an internal combustion engine flows, an analyzer that is connected to the sampling channel and analyzes the exhaust gas, a diluter provided upstream of the analyzer in the sampling channel, a recirculated channel that branches from a branch point set between the analyzer and the diluter in the sampling channel and joins the diluter, a pump that is provided in the recirculated channel and guides part of the exhaust gas from the branch point to the diluter, an additional channel that is connected to the recirculated channel or the sampling channel and through which a calibration gas or a purge gas flows, and an opening and closing mechanism provided in the additional channel.

The invention relates to the technical field of mine safety, and particularly discloses a gas monitoring and early warning system for roadway tunneling construction, which comprises a data acquisition module, a data processing module, a prediction module, an early warning analysis module, a sensor sensitivity compensation judgment module and a self-adaptive calibration module. Harmful gas concentration data and environment, geology and tunneling operation data are collected by constructing a three-level collaborative network of fixed nodes, an inspection robot and a tunneling machine micro sensor; carrying out data cleaning and fusing multi-source gas concentration data to obtain real-time gas concentration; predicting the gas concentration at the next moment through an LSTM network training model based on the real-time gas concentration; performing gradient early warning according to the predicted value and a safety threshold value, and linking ventilation, equipment and a risk avoiding system; sensitivity attenuation of the gas sensor is further judged and calibrated, full-domain real-time sensing, trend prediction and early warning and intelligent calibration of the sensor of the driving face gas are achieved, and monitoring timeliness, early warning scientificity and data reliability are improved.

The invention provides a secondary flow correction method, system and device for a mass flow controller, and relates to the technical field of fluid measurement and control, and the method comprises the steps: obtaining an actual gas flow value and a theoretical gas flow control value corresponding to each flow value set point in a target mass flow controller, the target mass flow controller is a mass flow controller calibrated through preset calibration gas; the actual gas flow value represents a gas flow value obtained by measuring gas passing through a flow value set point in the target mass flow controller at present; according to the actual gas flow value and the theoretical gas flow control value, determining a secondary correction coefficient of each flow value set point; and based on each secondary correction coefficient, correcting a preset gas flow control value in a corresponding flow value range in the target mass flow controller. According to the invention, the flow deviation of the MFC under different gases and set points is reduced.

Systems and methods for nitric oxide generation are provided. In an embodiment, an NO generation system can include a controller and disposable cartridge that can provide nitric oxide to two different treatments simultaneously. The disposable cartridge has multiple purposes including preparing incoming gases for exposure to the NO generation process, scrubbing exhaust gases for unwanted materials, characterizing the patient inspiratory flow, and removing moisture from sample gases collected. Plasma generation can be done within the cartridge or within the controller. The system has the capability of calibrating NO and NO2 gas analysis sensors without the use of a calibration gas.

This invention discloses a temperature control system for a high and low temperature calibration system for actual gas flow rate. The system comprises a heat exchange module and a refrigeration / heating unit. The heat exchange module has a sealed cavity for loading a cooling / heating medium, and a section of actual gas delivery pipe made of thermally conductive metal material seals through this sealed cavity within the calibration gas circulation loop of the high and low temperature calibration system. The refrigeration / heating unit circulates the cooling / heating medium into the sealed cavity of the heat exchange module, enabling the heat exchange module to exchange heat with the actual gas transported within the calibration gas circulation loop of the high and low temperature calibration system to achieve temperature control. This invention features a simple system structure and can use data from various temperature sensors as feedback signals to precisely control the gas temperature in the calibration gas circulation loop, achieving realistic simulation of various actual gas temperature conditions.

Disclosed herein are scientific instrument support systems, related methods, computing devices, and computer-readable media. For example, in some embodiments, a scientific instrument support apparatus includes sample analysis logic to cause a sample to be injected into a gas chromatograph and to obtain a mass spectrum of the sample using a mass spectrometer coupled to the output of the gas chromatograph, the mass spectrometer utilizing a mass calibration or a lock mass correction while obtaining the mass spectrum of the sample; calibration gas logic to control a supply of a calibration gas to the mass spectrometer during the void time of the gas chromatograph; and lock mass calibration logic to obtain a mass spectrum of the calibration gas using the mass spectrometer during the void time of the gas chromatograph and to calculate the mass calibration or the lock mass correction to be used by the sample analysis logic.

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.

The invention relates to the technical field of flue gas continuous emission monitoring systems, in particular to a gas path isolation and flow optimization system for flue gas CEMS full-process calibration. According to the technical scheme, the gas path isolation and flow optimization system for flue gas CEMS full-process calibration comprises a gas path isolation module, a pretreatment gas path optimization module, a cabinet panel control module, an analyzer replacement module and a phosphoric acid titration quality control module, the gas path isolation module is introduced, the pneumatic stop valve unit is integrated in the probe, automatic blocking of the probe and a flue gas path in the calibration process is achieved, and before full-process calibration is started, a control system sends an instruction to drive a pneumatic actuator, a valve body is rapidly closed, and physical connection between the probe and a flue is cut off; all standard gas flows to an analysis system through the sampling probe rod, so that a standard gas dissipation path is eliminated fundamentally, the quantity of standard gas actually participating in reaction in a calibration gas path reaches a theoretical design value, and the accuracy of core indexes such as indication error and repeatability is remarkably improved.

A calibration method includes receiving data characterizing a first pressure broadening coefficient, a second pressure broadening coefficient and a third pressure broadening coefficient of the target gas absorption associated with a first background gas, a second background gas and a third background gas, respectively. The method further includes, determining a molar ratio associated with the second background gas and the third background such that an effective pressure broadening coefficient associated with a target gas mixture including the second background gas and the third background gas mixed at the determined molar ratio is within a predetermined threshold of the first broadening coefficient. The target gas mixture further includes a target gas. The method also includes calibrating a gas analyzer using the target gas mixture to replace the calibration of the target in the first background gas. The calibration is based on absorption of electromagnetic radiation by the target gas in the target gas mixture.

This invention discloses a high and low temperature gas flow rate calibration system, characterized by: a calibration gas circulation loop, in which a gas supply system, a standard module, a calibration module, and a flow drive control module are connected in series via sealed pipes; a temperature control system and a calibration control system are also included; the temperature control system includes a heat exchange module and a refrigeration / heating unit; the heat exchange module has a sealed cavity inside, and a section of gas delivery pipe made of thermally conductive metal material seals through the sealed cavity in the calibration gas circulation loop of the high and low temperature gas flow rate calibration system; the refrigeration / heating unit is used to circulate and supply cooling / heating medium into the sealed cavity of the heat exchange module; heat exchange modules are provided on both the gas input and output sides of the gas meter under test in the high and low temperature gas flow rate calibration system. This invention has the advantage of being able to better simulate different operating conditions of gas meters, resulting in more objective and accurate calibration results.

The utility model relates to a gas detection device which comprises a light-emitting part, a calibration gas chamber, a detection gas chamber, a photoelectric detection assembly and a wavelength calibration assembly capable of adjusting the wavelength of light emitted by the light-emitting part, and the photoelectric detection assembly comprises a first detection part capable of receiving the light emitted by the light-emitting part. The calibration gas chamber and the detection gas chamber are both located on a light path of light emitted by the light emitting part. The gas detection device provided by the utility model solves the problem that the existing gas detection equipment is relatively high in maintenance cost.

The invention relates to a setting method (100) for a gas analysis device (10), in which method at least a first response factor (28) for a first substance sample component (21) is determined by means of a calibration gas mixture (15). On this basis, a first response function (31) is determined. Furthermore, a device parameter data set (25) having at least one device parameter (26) is detected and linked to a first response function (31). On the basis of the first response function (31), a second response function (32) for the second substance sample component (22) is determined by means of the transformation function (30). The first response function and the second response function (31, 32) are defined as a measured operating parameter (45). The transformation function (30) can be set using the device parameter data set (25). The invention further relates to a correspondingly designed computer program product (65) and to an evaluation unit (60). The invention also relates to a gas analysis device (10) and a system (50) having such an evaluation unit (60), belonging to such a gas analysis device (10).

The invention relates to a calibration method (100) of a gas pycnometer, said gas pycnometer comprising at least two containers, a reference container having a reference volumetric capacity, referred to as the first capacity, and a receiving container configured to hold a sample whose volume is to be determined, said receiving container having a test volumetric capacity, referred to as the second capacity, said gas pycnometer being configured to determine the volume v of a sample housed in the receiving container, characterized in that said gas pycnometer is characterized by a calibration function which depends on at least two modeling parameters: a sensitivity coefficient which is a predetermined value and a pycnometer-to-empty ratio which is a measurement value of said pycnometer when empty, the relative measurement uncertainty(s) of said pycnometer being determined as a function of the sensitivity coefficient and the pycnometer-to-empty ratio.Figure to be published with the abbreviation: none.

A method of calibrating a gas sensor comprises determining one or more initial calibration factors comprising a sensitivity of the gas sensor to one or more analytes of interest, determining a current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor by measuring a response of the gas sensor, and adjusting the one or more initial calibration factors of the gas sensor based, at least in part on the current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor, and a relationship between the sensitivity of the gas sensor to the one or more analytes of interest to the sensitivity of the gas sensor to the one or more conditions proximate the gas sensor. Related gas detectors, related methods of compensating and calibrating the gas sensors, and methods of determining a functionality of the gas sensors are disclosed.

The utility model discloses a mining infrared communication single-parameter series gas measuring instrument which comprises a shell, a calibration gas nozzle is arranged at the top of the shell, a gas detection cavity is arranged at the upper part in the shell, a shutter is arranged on the side wall of the gas detection cavity, and a single-parameter series sensor module is arranged in the gas detection cavity. A circuit board and a battery bin are arranged on the lower middle portion of the shell, a rechargeable battery is arranged in the battery bin and connected with the circuit board, the circuit board is further connected with a display screen and a button which are embedded in the side wall of the shell through a circuit, the single-parameter series sensor module is connected with the circuit board through a circuit, and a charging screw is arranged at the bottom of the shell. The charging screw is electrically connected with the rechargeable battery and charges the rechargeable battery, and the contact end of the charging screw is flush with the surface of the shell. According to the utility model, the problems of inaccurate measurement and poor sealing performance of the existing instrument are solved.

According to the calibration system and method for the ultrasonic metering module, the calibration tool, the calibration table body, the ultrasonic metering module and the processor are arranged, the calibration tool specially provides an adaptive air inlet environment for the ultrasonic metering module, the whole meter structure does not need to be adapted, the universality of the tool for metering modules of different specifications is improved, and the calibration efficiency is improved. Interference caused by non-metering components in whole meter calibration is avoided; the calibration table body provides standard flow and time parameters and gas is introduced, so that the stability of calibration gas conditions is guaranteed; the processor trains a prediction model based on flow parameters, instantaneous flow data collected by the module and environmental parameters, then the model is used for calibrating the instantaneous flow data, an accurate mapping relation between the metering module and standard flow can be established, and the influence of the environmental parameters is fully considered. Therefore, efficient and accurate calibration of the ultrasonic metering module can be realized, and the technical problems of poor tool universality, easy interference by non-metering components and insufficient calibration precision caused by whole meter calibration in related technologies are solved.

This invention discloses an in-situ calibration system for an underwater dissolved gas sensor with an integrated self-calibration module. A 2004nm butterfly laser module emits laser light, and a Herriott absorption cell module allows the laser to be reflected multiple times by the detector gas, resulting in selective absorption of the laser at a characteristic wavelength to form an absorption spectrum. A synchronization control module handles power supply, communication, environmental parameter control, and calibration timing control, enabling synchronized switching between the system's measurement and calibration modes. A data processing module inverts the spectral data collected by the system to obtain dissolved gas concentration data. A self-calibration gas supply unit introduces standard gas into the Herriott absorption cell module when the calibration program starts. This invention integrates the self-calibration function with the sensor detection unit, effectively simplifying the operation and maintenance process of underwater gas monitoring, improving the long-term stability of the sensor, and making it suitable for in-situ dissolved gas monitoring in various underwater environments such as oceans, lakes, and reservoirs.

The invention discloses an automatic calibration gas detection system and calibration method based on cooperation of mid-infrared light and visible light, and relates to the technical fields of optical detection, environmental monitoring, automatic control and the like, mid-infrared laser and visible laser are combined and emitted into a multiple reflection pool, and initial alignment is carried out based on visible laser of indicating light in an initial state; a high-reflectivity mirror bracket of the multiple reflection pool is provided with a stepping motor used for adjusting the angle of a high-reflectivity mirror, in the operation process, the signal intensity and the signal-to-noise ratio are monitored in real time, the stepping motor is driven to adjust the angle of the high-reflectivity mirror according to the monitoring result, and closed-loop automatic calibration is achieved. According to the invention, the invisible mid-infrared light path is visualized by using coaxial indicating light, so that the calibration time of initial installation and daily maintenance is shortened, the angle of the high-reflectivity mirror is automatically adjusted, the offset of the light path is compensated and the optimal detection state is kept during the operation of the system, and the long-term stability and reliability of the system are improved.

The invention relates to the technical field of gas detection equipment, and discloses a toxic gas detection device and method for process equipment and control engineering. The toxic gas detection device for the process equipment and the control engineering comprises a detector main body, a gas sensor arranged at a gas inlet end of the detector main body, a gas inlet unit and a control end, the gas inlet unit comprises a gas inlet pipeline with three interfaces, a purified gas source for providing clean gas and a switching valve; the gas inlet pipeline comprises a sensor interface used for being connected with the gas inlet end of the detector body, an environment sampling interface used for being communicated with the external environment and a calibration gas source interface used for being communicated with a purification gas source. The gas inlet unit is improved, the gas inlet unit and the control end are cooperatively used, the automatic calibration function of the gas sensor is achieved, a technician does not need to manually carry standard gas to all installation points for calibration operation, and therefore manpower and time cost is saved, and calibration efficiency is improved.

The invention discloses a photoacoustic spectrometry gas measuring instrument with a self-calibration function, and relates to the technical field of gas measurement, the photoacoustic spectrometry gas measuring instrument with the self-calibration function comprises a bearing plate, the bearing plate is provided with a laser, a photoacoustic cell, a multi-gas splitter and a sub-calibration gas cell, a first air pump and a second air pump are installed on the two sides of the multi-air branching device respectively, the multi-air branching device is connected with the sub-standard air pool through a plurality of air pipes, a lens is installed between the laser device and the photoacoustic pool, and when calibration is conducted, the first air pump and the fourth electromagnetic valve are started, the second air pump and the first electromagnetic valve are closed, calibration buffering is completed, and the multi-air branching device is connected with the sub-standard air pool through a plurality of air pipes. A first solenoid valve, a second solenoid valve, a third solenoid valve and a second air pump are opened to form an internal closed loop, then a laser is opened, a pressure-sensitive microphone is used for signal difference to obtain photoacoustic signals, photoacoustic signal coefficients in a model are corrected successively by using known gas concentration and recorded in a measurement system, and single calibration is completed.

A method of automatically calibrating a toxic gas detector 100 wherein the same calibration gas is used to calibrate one or more gas sensors 110, 112, 114 which detect the presence of a different toxi

The utility model discloses a portable dust generating device, including high pressure gas source, dust generator, mix uniform cabin and shunt device, and high pressure gas source is connected with the top of mix uniform cabin through two shunt gas paths, and dust generator is located on one of shunt gas paths, and the other shunt gas path is equipped with electrostatic gun, and mix uniform cabin is equipped with detachable screen rack and dust storage box, and shunt device is equipped with sampling port, and the inlet of shunt device is connected with mix uniform cabin inside through sampling pipe, and the end of sampling pipe that stretches into mix uniform cabin is located between screen rack and dust storage box, and sampling pipe is connected with calibration gas path, the utility model discloses through the uniform stability of lifting dust granularity, can replace screen according to need dust particle size, realizes dust particle size adjustable, thereby realizes the dust environment of specific particle size, can take out the dust after testing in time, does not influence the follow -up experiment, can generate the dust of full concentration range, realizes detection calibration, satisfies the detection demand of different concentration range.

The invention discloses a Fourier infrared mixed gas calibration device, a calibration method and a preparation method, and belongs to the technical field of Fourier infrared spectrometer calibration. According to the Fourier infrared mixed gas calibration device, stable isolation between calibration gas and the external environment is achieved through direct welding packaging of metal and the diaphragm, component change or concentration fluctuation of the calibration gas caused by invasion of external temperature, humidity and pollutants is avoided, and a long-term stable built-in reference basis is provided for an instrument. And through welding sealing, the risks of gas leakage and light path deviation caused by aging and loosening of the sealing ring are eliminated, and the physical stability and environmental adaptability of the device are remarkably improved. Therefore, the device can provide a constant, reliable and maintenance-free built-in gas scale for the Fourier infrared spectrometer, and the defects of frequent operation and insufficient stability of a traditional external standard gas calibration mode are effectively overcome.

The invention relates to a calibration device of an automobile emission analysis system, and belongs to the technical field of automobile exhaust emission detection.The calibration device comprises a flexible air bag, a multi-channel gas divider, a gas circuit control module and a controller, a gas outlet of the multi-channel gas divider is connected with a gas inlet of the flexible air bag, and a gas outlet of the multi-channel gas divider is connected with a gas outlet of the flexible air bag; an air outlet of the flexible air bag is connected with the air path control module through a pipeline, and the flexible air bag is also connected with a sampling port of the discharge analyzer to be calibrated through a pipeline; zero gas and distance gas are mixed through a multi-channel gas divider to generate calibration gas with known concentration, the calibration gas is stored in a flexible gas bag, the pressure of the gas bag is adjusted through a gas path control module to simulate an actual sampling environment, and accurate calibration of the emission analyzer to be calibrated is completed in combination with temperature compensation and a nonlinear correction algorithm. According to the invention, efficient and accurate calibration of the automobile emission analysis system is realized, the calibration efficiency and accuracy are improved, the measurement error is effectively reduced, and emission test requirements under various working conditions are met.

The invention discloses an online calibration device and method for a gas float flowmeter in the technical field of gas float flowmeters.The online calibration device comprises a fixing frame and a communicating pipe, the communicating pipe is provided with a gas source connector, and the communicating pipe is sequentially communicated with a pressure reducing valve, a temperature transmitter, a pressure transmitter, a float flowmeter and a Coriolis mass flowmeter; when a gas inlet calibration opening of the gas float flowmeter to be calibrated is in contact with the rubber ring, the conical rubber sleeve is inflated and expanded, the outer ring of the conical rubber sleeve can be clamped in the gas inlet calibration opening of the gas float flowmeter to be calibrated after being expanded, and then after calibration is finished, the valve is opened, so that air in the inner cavity is exhausted, and the gas float flowmeter to be calibrated is calibrated. When the gas float flowmeter is calibrated, the conical rubber sleeve can be shrunk, large friction does not need to be generated between the gas inlet calibration opening of the gas float flowmeter after calibration and the conical rubber sleeve, and therefore the situation that the installation stability of the conical rubber sleeve is affected by large friction force when the gas float flowmeter is taken down is avoided.

The invention discloses a calibration device for a two-photon laser-induced fluorescence system, particularly relates to the technical field of laser calibration, and is technically characterized in that the device comprises an air pressure control device which is used for being connected with a vacuum calibration cavity to convey calibration gas into the vacuum calibration cavity and controlling the air pressure in the vacuum calibration cavity; the vacuum calibration cavity is used for placing calibration gas and receiving the laser light path, so that the calibration gas in the vacuum calibration cavity is excited to generate a fluorescent light path; the ionization device is used for ionizing hydrogen in the vacuum calibration cavity to obtain hydrogen atoms; and the detection device is used for receiving a fluorescent light path generated in the vacuum calibration cavity so as to complete calibration gas detection. A pair of discharge polar plates is installed in a vacuum calibration chamber and connected with an external high-voltage direct-current power supply through a high-voltage insulated wire, so that glow discharge is generated between the two discharge polar plates to ionize hydrogen molecules, and the ionized hydrogen molecules can form hydrogen atoms after being compounded to meet experimental calibration conditions.

The utility model relates to the technical field of particulate matter sensors, and provides a particulate matter sensor with a zero calibration gas filtering function, which comprises a shell, a detection cavity is arranged in the shell, two sides of the shell are respectively provided with a gas inlet pipe and a gas outlet pipe, the gas inlet pipe and the gas outlet pipe are communicated with the interior of the detection cavity, one side of the detection cavity is provided with a zero calibration pipe, and the zero calibration pipe is communicated with the interior of the detection cavity. A zero calibration pipe is arranged in the shell, the zero calibration pipe is communicated with the interior of the detection cavity, a containing groove is formed in one side of the shell, a cleaning air hole is formed in the containing groove, the zero calibration pipe is communicated with the cleaning air hole, a filtering cover plate is arranged on one side of the containing groove, a filtering membrane is further arranged in the containing groove, and the filtering membrane is arranged between the side wall of the containing groove and the filtering cover plate. And the filtering cover plate is detachably connected with the shell. According to the technical scheme, the time required for zero calibration of the sensor is shortened.

The invention discloses a natural gas online water analyzer field calibration method, equipment and a medium, and relates to the technical field of natural gas analysis and testing. According to the method, the uncertainty of calibration gas is introduced into the calibration model based on the least square method, the target function is established by weighting the sum of squares of residual errors, and higher weights are given to data points with lower uncertainty, so that the accuracy and the reliability of model fitting are improved, the problem of heterovariance of measurement errors is effectively solved, and the accuracy and the reliability of measurement are improved. And the accuracy of parameter estimation is improved.

1. The name of the design product: oil gun metering calibration gas-liquid ratio detection all-in-one machine. 2. The use of the design product: gas-liquid ratio detection and identification equipment for oil gun. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.