201 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 discloses a volume correction instrument error analysis method and system based on an improved PE equation, and aims to improve the accuracy of fuel gas and biogas metering. According to the equipment, performance testing can be carried out under the conditions of different temperatures (20 DEG C to 40 DEG C) and pressures (101.3 kPa to 104.0 kPa) through an integrated fuzzy logic algorithm, and the average correction error is only 0.22%. A high-precision sensor and a data processing unit are used for monitoring and calibrating the gas volume in real time and compensating the influence of temperature and pressure changes. The fuzzy logic controller adjusts the reading of the gas meter according to real-time data, the accuracy of a metering result is ensured, algorithm optimization and intelligent equipment integration are focused, and the energy management efficiency is improved. The volume correction instrument provides help for a modern energy metering system and optimization of energy efficiency and cost.

The utility model relates to a gas flow device for calibrating a gas volumetric flowmeter. The gas flow device comprises a filter; a measured gas volumetric flowmeter; the first measuring assembly comprises a first pressure measuring piece and a first temperature measuring piece; a stagnation container, wherein a first stop valve is arranged between the stagnation container and the measured gas volumetric flowmeter; the throat diameters of the at least two sonic nozzles are different, and the at least two sonic nozzles are respectively communicated with the stagnation container; the confluence container is connected with at least two sonic nozzles, and a second stop valve is arranged between each sonic nozzle and the confluence container; the vacuum pump is connected with the outlet end of the confluence container, and a third stop valve is arranged between the vacuum pump and the confluence container. The calibration device is simple in structure, high in calibration result accuracy and good in stability; and the at least two sonic nozzles with different throat diameters are arranged, so that calibration of different flow points can be realized by combining the sonic nozzles with different throat diameters, and the calibration range is wider.

A method of calibrating a gas sensor comprises determining a sensitivity of a gas sensor to one or more conditions proximate the gas sensor, 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 while the one or more conditions proximate the gas sensor varies during operation 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 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.

To provide a pressure-resistance leakage inspection method for valve and pressure-resistance leakage inspection device for valve which can perform a high-precision leakage inspection while suppressing a facility cost for automation.SOLUTION: A pressure-resistance leakage inspection device 1 for valve includes: a calibration gas supply unit 40 which supplies calibration gas G2 into a chamber 10 by making a hydrogen concentration lower than a hydrogen concentration of inspection gas G1 so as to be almost equal to the atmosphere of hydrogen in the chamber 10 supplied with the calibration gas G2 at a supply flow rate for quality assurance and greater than the supply flow rate for quality assurance; and a leakage inspection pass / fail determination processing unit 51a which performs pass / fail determination processing of a leakage inspection on the basis of detection data following the time course of hydrogen by a gas sensor 30 of the calibration gas G2 supplied into the chamber 10.SELECTED DRAWING: Figure 2

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.

A high-position gas detector calibration device belongs to the technical field of high-position gas detector calibration equipment and comprises a calibration cover, a connecting rod, a plurality of extension rods and an outer joint, the calibration cover is detachably mounted at the top of the connecting rod, and external threads are arranged on the outer surface of the lower end of the connecting rod and the outer surfaces of the lower ends of the extension rods. Nuts are fixedly installed at the top ends of the connecting rods, the connecting rods are connected with the extension rods through screw joint matching of the external threads and the nuts, the extension rods are connected together through matching of the external threads and the nuts, air bins are arranged in inner cavities of the connecting rods, and the air bins are communicated with an inner cavity of the calibration cover. According to the utility model, the calibration cover can be buckled at the position of the gas detector on the ground, the calibration is carried out by utilizing the inner pipes to convey the calibration gas, the existing mode of calibrating the high-position gas detector by climbing can be replaced, and the operation is safer and more reliable.

The invention discloses a measuring device and method for calibrating gas mass flow, and belongs to the technical field of flow measurement. The device comprises a gas inlet pipe provided with a pressure regulating valve; the stagnation container is communicated with the air inlet pipe; the plurality of sonic nozzles are respectively arranged on the stagnation container, and each sonic nozzle is provided with an upstream end communicated with the stagnation container and a downstream end communicated with the collection container; a collection container; the exhaust pipe is communicated with the collecting container; the pressure measuring piece I, the temperature measuring piece I and the humidity measuring piece are connected to the stagnation container; and the second pressure measuring piece is connected to the collection container. The calibration method comprises the following steps: opening the pressure regulating valve and regulating until each sonic nozzle is in a critical flow state; and after the measured data is stable, collecting and calculating the standard flow. According to the gas mass flow metering device, the field gas source can be directly utilized, measurement can be conveniently and rapidly carried out, the field calibration problem of the gas mass flow metering device can be solved, it is guaranteed that the flow value of the gas mass flow metering device is accurate, and meanwhile the gas mass flow metering device can be used under the laboratory condition.

The invention discloses an in-situ calibration system and an in-situ calibration method for mixed gas measurement equipment, and relates to the technical field of insulating arc-extinguishing gas media. The system comprises an electric proportional valve which is configured to control the fixed gas cabin to be in at least two set output pressure states; the calibration gas cabin inflates the calibration pipeline in sequence based on each set output pressure state so as to change the pressure state of the calibration pipeline; the thermometer is configured to measure the temperature of gas in the calibration pipeline when the gas filling is finished; the pressure gauge is configured to measure the gas pressure in the calibration pipeline when inflation is finished; the SF6 concentration meter is used for measuring a gas density measurement value of the calibration pipeline when gas filling is finished; and the upper computer is used for calibrating the SF6 concentration meter according to the gas density measurement value, the gas temperature, the gas pressure and the set mixing ratio. By adopting the system, the in-situ calibration of the SF6 concentration meter can be completed by using the standard gas, and high-precision in-situ calibration can be realized.

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 a method (100) for calibrating a gas pycnometer, said gas pycnometer comprising at least two containers, a reference container having a reference volume capacity, called the first capacity, and a receiving container configured to house a sample whose volume is to be determined, said receiving container having a test volume capacity, called 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 an empty pycnometric ratio which is an empty measurement value of said pycnometer, the relative measurement uncertainty(s) of said pycnometer being determined as a function of the sensitivity coefficient and the empty pycnometric ratio.Figure to be published with the abstract: none.

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.

The invention discloses a gas logging automatic calibration device and method, and the device comprises a flow path switching valve which can carry out the switching selection of a plurality of input flow paths, and is connected with an output (to a gas logging analyzer) flow path; the input flow path is connected with different standard gases; the at least one input flow path is connected with zero air and logging gas logging online sampling equipment; and the control circuit is used for coordinating and controlling the automatic calibration process of the gas logging analyzer according to the command of the logging instrument. In the automatic calibration process, the automatic calibration device is sequentially connected with each calibration gas input flow path and the gas measurement analyzer according to an instruction of the logging instrument for calibration; each flow path is provided with a pressure control and flow stabilization module and a pressure monitoring module to monitor whether the flow path leaks air or not; the standard gas storage area is provided with a combustible sensor and is connected with a control circuit for safety monitoring. According to the invention, the automatic calibration of the gas logging analyzer in the gas logging process can be realized, and the dead volume of a pipeline and the gas logging calibration error caused by standard gas mixing sample preparation are minimized.

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.

A flow calibration device and method for a gas monitoring system. The flow calibration device includes, but not limited to: an inlet configured to facilitate an inflow of a gas flow sample from a nose grip of the gas monitoring system; an outlet configured to facilitate an outflow of the gas flow sample to a port manifold of the gas monitoring system; a flow channel defined between the inlet and the outlet; a pressure transducer, configured to calibrate at least one sample pressure transducer of the gas monitoring system; and a valve positioned between the inlet and the outlet, configured to adjust the flow rate of the gas flow sample between a first benchmark flow rate and a second benchmark flow rate.

The utility model discloses a calibration device of a laser gas sensor, and relates to the technical field of gas sensor calibration, the laser gas sensor is provided with a mounting groove, the side wall of the mounting groove is provided with a laser emitter and a laser detector which are oppositely arranged, the laser detector is used for receiving laser beams emitted by the laser emitter, and the laser beams are arranged on the mounting groove. The calibration device comprises a box body, a sealing cavity is formed in the box body, the sealing cavity is suitable for storing gas, the side wall of the sealing cavity is further provided with a light-transmitting part, and at least part of the box body is suitable for being installed in the installation groove so that the light-transmitting part can be located between the laser transmitter and the laser detector. Therefore, multi-concentration-point calibration of the laser gas sensor can be realized by replacing the calibration device with the calibration gases with different concentrations, the calibration process is simplified, and meanwhile, the manufacturing cost of the laser gas sensor is reduced.

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).

A method of automatically calibrating a toxic gas detector, wherein the gas detector comprises one or more electrochemical toxic gas sensors, each electrochemical toxic gas sensor configured to detect the presence of a different target toxic gas, said toxic gas detector in communication with a processor and a memory, wherein the method comprises: determining a calibration factor for each of the one or more electrochemical toxic gas sensors in the toxic gas detector, wherein the determining of the calibration factor for each of the plurality of electrochemical toxic gas sensors comprises the steps of: providing a predetermined concentration of the target toxic gas to the electrochemical toxic gas sensor and measuring a response of the electrochemical toxic gas sensor to the target toxic gas, wherein the target toxic gas is different for each of the one or more electrochemical toxic gas sensors; providing a predetermined concentration of an electrochemical calibration gas to the electrochemical toxic gas sensor and measuring a response of the electrochemical toxic gas sensor to the electrochemical calibration gas, wherein the electrochemical calibration gas is the same for each of the one or more electrochemical toxic gas sensors; calculating the calibration factor as a function of the response of the electrochemical toxic gas sensor to the target toxic gas and the electrochemical calibration gas; storing the calibration factor in the memory; and calibrating the toxic gas detector by: supplying a predetermined concentration of the electrochemical calibration gas to each of the one or more electrochemical toxic gas sensors and measuring the response of each of the one or more electrochemical toxic gas sensors to the electrochemical calibration gas; and calibrating the response of each of the one or more electrochemical toxic gas sensors to the corresponding target gas based on the respective stored calibration factor for the electrochemical toxic gas sensor and the measured response to the electrochemical calibration gas.

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 invention relates to a mass spectrometer combined calibration method, which comprises the following steps of: (1) preparing standard gas, namely selecting and preparing mixed gas as the standard gas, wherein the mixed gas is the same as sample gas in component and close to the sample gas in concentration; (2) a combination system is created, the combination system is of a data structure, the data structure at least comprises one piece of multi-dimensional data, and the multi-dimensional data corresponds to the components of the standard gas; (3) establishing a calibration model, including setting relevant parameters of the standard gas, the relevant parameters including purposes, scanning modes, operation duration, precision values, precision quantity, filters, baseline modes and purpose selection and calibration, and selecting a combined system as an import system to configure the calibration model; (4) collecting standard gas data; (5) processing standard gas data; and (6) introducing a synthesis system. According to the calibration method, the mixed gas which is the same as the sample gas in component and similar to the sample gas in concentration is selected and configured as the calibration reference, so that the cost of using the standard gas can be reduced, the calibration time is shortened, and meanwhile, the quantitative analysis accuracy is improved.

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.