94 results about "Helium ionization detector" patented technology

The invention relates to a field gas chromatograph with flame ionization for the analysis of a gaseous mixture of hydrocarbons, extracted, in particular, from oil drilling mud. Said mixture consists of a fraction of heavy hydrocarbons (beyond pentane) dissolved in mud in gaseous form. Said field gas chromatograph is made up of two independent analysis circuits, dephased by half a cycle and synchronised one with the other. Said analysis circuits are comprised of at least one sampling cell in a preferred design layout, at least one capillary separation chromatography column, at least one flame ionization detector, and at least one electrometer for the conversion of an electrical current, collected by the flame ionization detector, into a voltage signal describing a chromatogram.

The invention discloses a total hydrocarbon tester having the on-line attenuation function. The tester comprises a sampling pipe, a pump, a hydrogen flame ionization detector, a compressed air bottle and a mixed gas chamber. An input end of the mixed gas chamber is connected with the sampling pipe, the other input end of the mixed gas chamber is connected with an air pipe, and the air pipe is connected with the compressed air bottle and provided with an air flow control device. The output end o the mixed gas chamber is connected with the pump through a mixed gas flow control device, and the pump is connected with the hydrogen flame ionization detector. Sample gas enters the mixed gas chamber, is mixed with clean air and reaches the hydrogen flame ionization detector under the action of the pump, and the hydrocarbon content of the sample gas is tested. The mixed gas flow control device and the air flow control device cooperate to control the proportion of the sample gas to the clean air, and the on-line attenuation function is achieved. By means of the total hydrocarbon tester, the concentration of hydrocarbon in the sample gas entering the hydrogen flame ionization detector is lowered in a quantitative mode, and shutdown of the tester due to overload or insufficient oxygen in the sample gas or other reasons is avoided.

The invention relates to a method for measuring trace impurity concentration of 7N electronic grade ultrapure ammonia. The method comprises the following steps of: separating trace impurities from the ultrapure ammonia by a pipeline system subjected to corrosion-resistant and adsorption-resistant treatment, by large-flow replacement, sweeping and sampling and a three-valve four-column cutting back-flushing gas channel system; and analyzing impurity gases by using a direct current discharging helium ionization detector (DID). The method has the advantages of capacity of providing a balanced (stable state) analysis value within short time, quantitative accuracy, low detection limit and short analysis period.

The invention provides a helium ionization gas chromatography system for analyzing decomposition products of SF6. The system in characterized by includes a central cutting device and a double helium ionization detector. The central cutting device includes four switching valves, six chromatography columns and seven carrier gas paths. The double helium ionization detector includes two sets of helium ionization detector devices. The helium ionization gas chromatography system for analyzing decomposition products of SF6 also includes a chromatography column box temperature controlling device and a carrier gas cutting and air-insulation device, wherein the chromatography column box temperature controlling device includes a set of programme temperature increasing column box and three sets of individual column sub temperature-controlling column boxes, and the carrier gas cutting and air-insulation device includes a set of four-way valve system and a set of carrier gas path. By means of the system, total analysis of the decomposition products of SF6 can be completed just by one sample-feeding operation.

The invention discloses an analysis system for determining impurity components in highly pure gases, and a determination method thereof. The analysis system comprises a helium ionization detector, a hydrogen flame detector, seven valves, seven columns and three sample quantification rings, and the detection of many impurity components, such as nitrogen, hydrogen, oxygen / argon, carbon monoxide, carbon dioxide, methane, ethane / ethylene, acetylene and C3 hydrocarbon impurities in various highly pure gases, such as highly pure ammonia, highly pure oxygen, highly pure nitrogen and highly pure hydrogen is realized on the analysis system. The method allows impurities in the highly pure gases to be separated through chromatographic columns and to be detected through the helium ionization detector and the hydrogen flame detector by adjusting the opening or closure of the valves to obtain the determination data of the impurities. The analysis system can detect a variety of impurities in highly pure industrial gases, so the determination cost is reduced; and the method can satisfy the sensitivity requirement of highly pure gas analysis and the detection limit requirements of all impurity gases, and greatly increases the analysis efficiency.

An auto-cleaning and auto-zeroing system (1) comprises a first conduit for flow of ambient gas (16) and a 2nd conduit (22) for flow of ambient air (18). A cleaning chamber (12) removes impurities from ambient air (18). The 1st conduit (20) and 2nd conduit (22) are connected to a valve, operated by the continuous motor, which continuously draws ambient gas (16) or cleaned and filtered ambient air (18) through the system. Cleaned and filtered ambient air (18) enters the ionization chamber (10) to carry out a cleaning (flushing) and a cleaning (ionization) cycle. In this manner, contaminants and pollutants left in the ionization chamber (10) from the measurement of ambient gas (16) are flushed out and removed.

The invention relates to an ultrapure phosphine analysis method and an apparatus thereof. The method comprises the following steps: 1, sampling: displacing ultrapure phosphine to a quantitative tube at a flow of 60-120mL / min under 0.05-0.15MPa in an isobaric sample introduction mode with high-flow blow displacement sampling, and ensuring the rapid detection of the impurity concentration change, and giving a balanced analysis value within a very short time; trace impurity separation: sending the above sampled sample gas for detection to a separating system at a flow of 20-50mL / min for the trace impurity separation; and 3, detection: inputting the separated trace impurities to a detector in order to obtain an analysis result. A corrosion and adsorption inhibition treatment highly-airtight pipeline system and a high-flow displacement blow, isobaric sample introduction and three-valve-three-column cutting reverse blow air passage system are used to separate the trace impurities in the ultrapure phosphine, and the direct current discharge helium ionization detector is used to analyze the impurity gas. The balanced analysis value can be given within a very short time, and is quantitative and accurate.

A system and method for ionization detection in electrically enhanced air filtration systems is described. One embodiment includes a system for electrically enhanced air filtration, the system comprising an electrically enhanced filter comprising a filter and an ionizing electrode disposed on an upstream side of the filter; a control device connected to the electrically enhanced filter, wherein the control device can control the electrically enhanced filter; and an ionization detector, wherein the ionization detector is adjacent to the electrically enhanced filter and wherein the ionization detector is connected to the control device.

A supplemental air system for a portable, intrinsically safe (IS), flame ionization detector (FID) device includes a portable, intrinsically safe, FID device and a supplemental air system coupled to the FID device configured to store compressed air and deliver a flow of regulated air to the FID device as needed.

The invention discloses a photo ionization detector, comprising a vacuum ultraviolet lamp and an ionization chamber, wherein the ionization chamber comprises two electrodes with minor arc radial cross sections, wherein the electrodes are arranged symmetrically, and comprise a polarized electrode and a collecting electrode. The two electrodes insert into the interior of polytetrafluoroethylene tank in the ionization chamber, such that base current and noise of the electrodes caused by irradiation of the vacuum ultraviolet lamp are avoided. The detector contains an automatically cleaning system to prevent decreasing of sensitivity of the detector caused by pollution of light window and electrodes when the detector is in a continuous operation for a long time. The photo ionization detector suits as a detector of a portable gas chromatograph and a rapid gas chromatograph.

A gas chromatography-quadrupole time-of-flight mass spectrometry / flame ionization detection method of flavor components in cigarette mainstream smoke comprises the following steps: collecting the flavor components in the cigarette mainstream smoke through adopting a Cambridge filter, extracting the flavor components with dichloromethane or n-hexane, taking the obtained extract liquid, analyzing the extract liquid, and allowing the obtained sample to undergo chromatographic column separation and to enter a quadrupole time-of-flight mass spectrometer (QTOF MS) and a flame ionization detector (FID) for determination in order to realize accurate qualitative diagnosis and quantification of the flavor components in cigarette mainstream smoke. The gas chromatography-quadrupole time-of-flight mass spectrometry / flame ionization detection method is applied to determination of the flavor components in cigarette mainstream smoke for the first time, and a QTOF MS spectrogram and an FID spectrogram can be simultaneously obtained only through one-shot sample introduction; and the components of a complex sample can be accurately characterized through the QTOF MS, a sample with very wide concentration range can be accurately quantified, and the retention times of the two spectrograms are completely same, so accurate qualitative diagnosis and quantification of the flavor components in cigarette mainstream smoke can be realized.

The present disclosure relates to flame based detection methods for compressed mobile phase chromatography. In particular, the present disclosure relates to the operation of a flame ionization detector for carbon dioxide based chromatography, such as supercritical fluid chromatography. The present disclosure includes a method of matching a chromatographic column with a flame ionization detector inner burner including providing a chromatographic column with an internal diameter, determining an optimal mobile phase flow rate for the chromatographic column, calculating an optimal inner diameter of the inner burner that combined with the internal diameter and flow rate of the column produces optimal detector performance, and providing a flame ionization detector inner burner having an inner diameter substantially equal to the calculated optimal inner diameter.

The invention relates to an underwater gas chromatography system for realizing in-situ test for H2 and CH4 in seawater and an operation method thereof. The underwater gas chromatography system comprises a seawater automatic sampling and gas membrane extracting unit, a multi-component gas automatic detecting and self-correcting unit and an exhaust gas recovering unit, wherein the seawater automatic sampling and gas membrane extracting unit is mounted on an instrument cabin end cover; the multi-component gas automatic detecting and self-correcting unit and the exhaust gas recovering unit are packaged in a high-pressure sealing instrument cabin; the seawater automatic sampling and gas membrane extracting unit is used for separating and extracting gas from a seawater sample and the gas is applied to the subsequent assay determination of a gas automatic detection device; the multi-component gas automatic detecting and self-correcting unit is used for quantitatively analyzing and determining the content of the gas in the seawater by using a pulse helium ionization detector; the exhaust gas recovering unit is used for storing the exhaust gas discharged from the system in an exhaust gas bottle, keeping the system pressure within a suitable numerical range and ensuring the normal running of all functional components in the system. According to the invention, the gas chromatographic technique is applied to underwater position and can be used for performing underwater accurate in-situ test on various dissolvable gases in deep sea and truly reflecting the content of the in-situ gases on seabed.

A pulsed discharge helium ionization detector for gas chromatography with multiple combined bias / collecting electrodes.

The invention relates to a hydrogen flame ionization detector and working method thereof. The hydrogen flame ionization detector comprises an outer cover, a chromatographic column, a collector, a polarization electrode, a conductive nozzle and a detection circuit. The collector is connected with the detection circuit after being connected with a polarization power source in series. The collector is connected with the negative pole of the polarization power source. The conductive nozzle is a ground potential. According to the hydrogen flame ionization detector, polarization voltage is connected to a signal outgoing line of the collector in series, meanwhile, the traditional polarization electrode and the nozzle are combined into a whole, the ground potential is kept, the normal function of the detector is ensured, and the equipment complexity and production technology are simplified.

The invention discloses a cooling oil content measuring method. The cooling oil content measuring method comprises a step of qualitative and quantitative analysis on one or more ingredients of menthol, camphor, eucalyptol and eugenol. The method comprises the following specific steps: (1) taking the menthol, the camphor, the eucalyptol and the eugenol as reference objects; (2) treating a cooling oil sample by using a solvent, and then detecting the cooling oil sample by using a GC (Gas Chromatography) method; (3) a GC measuring method is as follows: a chromatographic column and a detector are used, wherein the chromatographic column is an HP-INNO WAX capillary column; the detector is a flame ionization detector; the temperature of the detector is 250-300 DEG C, the temperature of a sample inlet is 220-270 DEG C, the temperature of the column is increased in a programmed manner from an initial temperature of 60-110 DEG C to 220-280 DEG C, the temperature is increased by 5-15 DEG C every minute and kept for 8-20 minutes; sampling mode: split sampling is adopted, and the split ratio is 20:1. The method is scientific, reasonable, simple, convenient, easy to implement and suitable for quality control of volatile components including the menthol, the camphor and the like of the cooling oil and relevant extractives.

The invention discloses a method for diagnosing a fault of GIS (geographic information system) equipment with multicomponent gas on the basis of a PDHID (pulsed discharge helium ionization detector). According to the method, qualitative and quantitative analysis of multicomponent foreign gas in SF6 gas and data storage are completed, whether the GIS equipment has a fault is determined according to test data, and if the GIS equipment has the fault, the type and the degree of the fault are analyzed and judged; whether the fault of the GIS equipment is involved with solid insulation in the GIS equipment is diagnosed, the location and the development trend of the fault are judged, a treatment suggestion for the GIS equipment is proposed, and an GIS equipment diagnosis result is simulated by computer 3D animation. The method is based on the PDHID technology, SF6 gas chromatography, computer software technology and the like are comprehensively applied, the fault of the GIS equipment is studied according to change of concentration of 15 types of foreign gas, fault diagnosis of the GIS equipment is changed from an invisible black box type form to a visible and direct display form, so that judgment of the equipment fault is more facilitated, and timely treatment is facilitated.

The invention relates to a gas chromatograph for measuring solution gas in transformer oil. The gas chromatograph is characterized by comprising a residual sample gas self-cleaning system, a back flushing system for C3+ component in transformer oil, an instrument quick stabilizing system and a helium ionization detector, wherein an electromagnetic switch valve used for controlling a gas carrying flow is arranged on the residual sample gas self-cleaning system; the back flushing system for C3+ component in transformer oil comprises a ten-way valve; a quantifying pipe and a needle valve are arranged on the ten-way valve; the instrument quick stabilizing system comprises a four-way valve; the electromagnetic switch valve is connected with a sample injector and then is successively connected with the ten-way valve, the helium ionization detector and the four-way valve. The gas chromatograph for measuring solution gas in transformer oil is low in cost and convenient in operation; the limit of detection can reach 10ppb level; the problems of mutual influences of sample gases and test interference caused by other impurities in gas extruded from the oil can be solved; the stabilizing time of the instrument basically can be controlled within 1 hour.

The flame ionization detector consists of sample port, hydrogen port, nozzle, air port, igniting coil and collector electrode, as well as nozzle cap, spring and shaft. Of the flame ionization detector, the shaft with flange is connected to the negative high voltage power source, the nozzle with nozzle cap possessing through hole constitutes the polarizing electrode, the spring has one end contacting the nozzle cap and the other end contacting the flange, and the igniting coil is mounted over the collector electrode. The present invention has high signal collecting efficiency of the collector electrode, lowered noise interference, and high sensitivity.

Disclosed is a gas chromatography-quadrupole time-of-flight mass spectrometry / flame ionization detection method for tobacco essence perfume. The method includes subjecting the tobacco essence perfume to organic solvent extraction and centrifugation, taking an organic solvent layer to analyze, regulating tail-end distribution of a chromatographic column through a capillary flow technology after the sample is subjected to chromatographic column separation, and determining by a QTOF MS (quadrupole time-of-flight mass spectrometer) and FID (flame ionization detector) to achieve accurate qualitativeness and quantitativeness of the tobacco essence perfume. The gas chromatography-quadrupole time-of-flight mass spectrometry / flame ionization detection method is put forward for the first time and is applied to determination of the tobacco essence perfume, QTOF MS and FID spectrograms can be obtained simultaneously only by one-needle sample injection, QTOF MS can determine components of complicated samples accurately, the FID is capable of qualifying the sample with wide concentration range accurately, and the retention time of the QTOF MS spectrogram and the retention time of the FID spectrogram are the same, so that accurate qualitativeness and quantitativeness of complicated tobacco essence perfume samples can be achieved.

The invention discloses a method and system for measuring the content of gas components in fuel hydrogen, a gas sample is quantitatively sampled through a first quantitative loop, then a first chromatographic column and a first exhaust valve are conducted, the front main components of hydrogen are emptied through the first exhaust valve, and when oxygen and argon are separated from the first chromatographic column, the first chromatographic column is communicated with a second chromatographic column, oxygen and argon are carried into the second chromatographic column, when oxygen and argon completely enter the second chromatographic column, the first chromatographic column is switched to be communicated with the first exhaust valve, and main components after hydrogen are discharged. When nitrogen is separated from the first chromatographic column, the first chromatographic column is switched to be communicated with the second chromatographic column, the nitrogen, methane and carbon monoxide are carried to the second chromatographic column, and the content of the nitrogen, methane and carbon monoxide is detected by the pulse discharge helium ionization detector, so that a gas sample can be prevented from being separated at one time, and the fuel hydrogen content is high; the separated permanent gas is easily separated from the first chromatographic column, so that the detection result is inaccurate, the detection efficiency can be improved as much as possible through twice completion, and the separation time is prevented from being prolonged.

The invention discloses a hydrogen flame ionization detector, which is characterized by comprising a detector cavity, an ignition filament, a collection electrode, a signal output end, an oxidant gasinput channel, a nozzle, a high-pressure component and a carrier gas input channel; the detector cavity is a vertical channel, the ignition filament is arranged in an ignition filament pipeline whichis communicated with the detector cavity, the signal output end is connected with the collection electrode, the oxidant gas input channel is communicated with the vertical channel, the high-pressure component extends into the vertical channel and is connected with the nozzle, the carrier gas and fuel / make-up gas input channel is communicated with the vertical channel, and the detector further comprises an electronic flow controller for controlling the input of gas; and the electronic flow controller is adopted to precisely control the gas flow, and is capable of automatically detecting the status of interior of the cavity and controlling automatic ignition and the cut-off of three ways of gas flow in the failure of ignition, so that not only can safety be achieved, but also the gas can besaved, in addition, the hydrogen flame ionization detector also has the characteristics of being simple in structure, stable and reliable, and convenient to operate.

The invention discloses a gas chromatograph for gas analysis in production field, comprising a sampling unit, a gas path control unit, a circuit control unit, a separation unit, a detection unit and a data processing unit. The gas chromatograph for gas analysis in production field is characterized in that the sampling unit is a sampling and automatic sample injection unit, and is composed of a fixed volume sampling tube, a flow meter and a ten-way valve with blowing function; the gas path control unit is composed of a solid filter, a stainless steel diaphragm pressure stabilization valve and a helium purifier, and provides high-purity carrier gas for the separation unit; the circuit control unit is composed of a temperature control circuit, a signal amplification circuit and a detector pulse high-voltage circuit; the separation unit is provided with three diaphragm valves with blowing function, wherein one is the ten-way valve with blowing function in the sampling unit, the other two are four-way valves with blowing function, and complete separation of constituents is completed through a three-valve and four-column switching flow; the detection unit is a pulse helium ionization detector; and the data processing unit is composed of an embedded industrial control computer and a data uploading module. The gas chromatograph for gas analysis in production field has the advantages of high detection sensitivity, good stability and strong operability.

To suppress baseline current other than baseline current derived from the ionization of impurities, and to achieve the enhancement of the SN ratio of a detection signal and the improvement of the lower limit of detection, the inner diameter of a bias electrode for collecting an ion derived from a sample component is made smaller than the inner diameter of an insulating member separating the bias electrode and a collector electrode. Light emitted from plasma formed by dielectric barrier discharge is shielded by the bias electrode, so that the light is not cast directly on the surface of the insulating member. Therefore, the photoelectric effect caused by casting light of high energy does not occur on the surface of the insulating member, whereby a decrease in electric resistance of the surface can be prevented.

The invention relates to equipment for detecting sample gas. The equipment comprises a flame ionization detector, wherein the flame ionization detector comprises a sample gas inlet, a combustible gasinlet and a combustion-aid gas inlet; in the flame ionization detector, sample gas flowing into the flame ionization detector is ionized under the action of a flame generated by combustible gas and combustion-aid gas, so as to generate a signal for chemically analyzing the sample gas; the equipment also comprises a compensation gas supply device to provide compensation gas to the flame ionizationdetector, so as to eliminate or relieve the disturbance caused by oxygen in the sample gas; and the compensation gas is oxygen-containing gas. The invention further provides a method for detecting thesample gas by the flame ionization detector. By the equipment and the method, the problem of disturbance of the oxygen in the oxygen-containing sample gas to a detection result can be solved.

The present invention discloses a photoionization detector (PID) system that can perform calibrations automatically. The PID system comprises a measurement gas chamber and one or more calibration gas chambers. The one or more calibration gas chambers each hold a type of calibration gas. In one embodiment, a volatile organic compounds (VOCs) measurement and a calibration measurement are conducted in the same gas chamber. In another embodiment, VOCs and calibration measurements are conducted in different gas chambers either simultaneously or at different times.

Sodium-cesium detection systems and methods for the simultaneous detection of both sodium (Na) and cesium (Cs) in gas are provided. The detection systems include two non-identical ionization chambers each having an anode and a cathode that ionize Na and Cs in gas. Each ionization chamber generates a current proportional to the Na and Cs concentration and based on the current, Na concentration and Cs concentration in the gas is determined.

The invention relates to an analysis method and an apparatus of ultra pure arsine. The analysis method comprises following steps: firstly, sampling, wherein negative pressure sample injection and static analysis are adopted, the pressure of a quantitative tube is reduced to 1X10<-4> to 1X10<-7>Pa using a molecular pump assembly, oxygen nitrogen base pressure and nitrogen base pressure are reduced to less than 10ppb accompanied with helium sweeping and negative pressure replacement, and then the quantitative tube is filled with ultra pure arsine until gage pressure reaches zero for sample injection analysis; separating of trace impurities, wherein obtained sampled samples to be tested are delivered into a separation system, which is treated via antiseptic treatment and anti-adsorption treatment, by a carrier gas with a flowing speed of 20 to 50mL / min for trace impurity separation; and at last, detecting, wherein the samples to be tested, which are treated via trace impurity separation, are delivered into a detector so as to obtain analysis results. According to the analysis method and the apparatus, the trace impurities in ultra pure arsine can be separated, and a direct current discharge helium ionization detector (DID) is used for analyzing impurity gases; the analysis method and the apparatus are safe and stable; equilibrium analysis values can be obtained in a short time; quantification is accurate; detection limit is low; and analysis period is short.

The flame ionization detector, which comprises a supply and an ignition device (7) for the combustible gas, a supply for the sample gas, a combustion chamber (4) in which the sample gas is ionized by the flame, and electrodes (8, 1) to which a voltage is applied in order to generate and measure the ion current, is distinguished in that it is constructed as an integrated planar system of at least three parallel platelet-like substrates (1, 2, 3) which are connected to one another and are processed by microsystem technology methods, with a central substrate (1) comprising nozzles (5, 6) for the gases and the ignition device (7) and a recess which forms a part of the combustion chamber (4), is completed by recesses in the neighboring substrates (2, 3) and is essentially closed together with the nozzle region by these substrates (2, 3), and the neighboring substrates (2, 3) comprise supply channels (10, 11) for the gases.