A kind of flame ionization detector, igniting judgment means and determination methods thereofTechnical field
The invention relates to the igniting judgment means of a kind of igniting judgment means, particularly a kind of flame ionization detector.
Background technology
Chromatograph is the device for carrying out chromatographic isolation analysis.Including sampling system, detection system, record and data handling system, temperature control system and mobile phase control system etc..Modern chromatograph has stability, susceptiveness, versatility and automaticity high.These chromatographs are widely used for chemical products, and certain of macromolecular material is containing quantitative analysis, and gel chromatography can also measure molecular weight and the distribution thereof of macromolecular material.The detector that chromatograph is conventional has TCD, flame ion.Flame ion (FID) detector is due to highly sensitive, reliable operation, application is widely, it it is a kind of high sensitivity common detector, all of Organic substance is almost had response by it, and to inorganic matter, the materials not dissociated in noble gas or flame etc. are without response or respond only small, its remolding sensitivity is very high, detection limit reaches 10-13g/s, to temperature-insensitive, response is fast, it is suitable for connecting open tubular column and carries out the separation of complex sample, it it is a kind of hands section in gas chromatograph detector, hydro carbons sensitivity is best, it is widely used in volatile hydrocarbon and many detections containing carbonization compound.The full name of flame ion is flame ionization detector because general all be hydrogen, so being generally hydrogen flame detector.Its principle is when Organic substance is through detector, can produce ion in flame there, and under the effect of polarizing voltage, the electric current between nozzle and collector can increase, and this current signal is detected and recorded can obtain corresponding spectrogram.General organic compound has response on flame ion, and general molecular weight is more big, and sensitivity is more high.Flame ionization detector is operationally, it is necessary to light hydrogen.After hydrogen is lighted, flame ionization detector can normal operation.Daily usual employing steam method, with the naked eye judges whether hydrogen is lighted, it will usually exist and judge inaccurate situation.Owing to causing the formation of water in flame ion combustion process, it is easy to cause detector fray-out of flame, the flow of carrier gas and hydrogen and air and ratio all can cause differing of the effect of igniting and flame combustion in addition, thus directly affect the response of flame ion.Therefore, it is possible to whether real-time judge flame is ignited for chromatographic properly functioning particularly significant.
Summary of the invention
It is an object of the invention to, for flame ionization detector operationally, can there is inaccurate situation when judging whether to light, whether design a kind of detector igniting judgment means is used for real-time judge ignited.
For reaching above-mentioned purpose, the present invention provides the igniting judgment means of a kind of flame ionization detector, including: a humidity sensor, it is positioned over above this flame ionization detector, for detecting the air humidity above this flame ionization detector；And a controller, connect this humidity sensor, and be analyzed judging according to the air humidity receiving this humidity sensor sensing, when this air humidity is more than a predetermined value, then judging point pyrogene merit.
Above-mentioned igniting judgment means, also includes a display device, connects this controller, for showing the air humidity data that this humidity sensor records in real time, and displays whether to light a fire successfully.
For reaching above-mentioned purpose, the present invention provides a kind of flame ionization detector, including: flame ionization detector body；And the igniting judgment means of above-mentioned flame ionization detector.
For reaching above-mentioned purpose, the present invention provides a kind of flame ionization detector igniting determination methods, including:
Humidity Detection step: for by being provided above a humidity sensor at this flame ionization detector, detecting the air humidity above this flame ionization detector；
Igniting judges step: this air humidity and a preset value for being sensed by humidity sensor compare, when these air humidity data are more than this preset value, it is judged that this flame ionization detector is lighted a fire successfully.
For reaching above-mentioned purpose, the present invention provides the igniting judgment means of a kind of flame ionization detector, including: one first humidity sensor, connect this controller, it is positioned over above this flame ionization detector, for detecting one first air humidity above this flame ionization detector；One second humidity sensor, connects this controller, is positioned in surrounding, for detecting one second air humidity of surrounding；And a controller, connect this first humidity sensor and this second humidity sensor, and be analyzed judging according to the air humidity receiving this first humidity sensor and this second humidity sensor sensing, time when this first air humidity is more than this second air humidity beyond a preset ratio, then judging point pyrogene merit.
Above-mentioned igniting judgment means, this preset ratio is 30%.
Above-mentioned igniting judgment means, also includes a display device, connects this controller, the second air humidity data that the first air humidity data recorded for real-time this first humidity sensor of display and this second humidity sensor record, and displays whether to light a fire successfully.
For reaching above-mentioned purpose, the present invention provides a kind of flame ionization detector, including: flame ionization detector body；And the igniting judgment means of above-mentioned flame ionization detector.
For reaching above-mentioned purpose, the present invention provides a kind of flame ionization detector igniting determination methods, including:
Humidity Detection step: by being provided above one first humidity sensor at this flame ionization detector, detects one first air humidity above the flame of this flame ionization detector；By this surrounding, one second humidity sensor, one second air humidity of detection surrounding are set；
Igniting judges step: these the first air humidity data and these the second air humidity data are compared, when these the first air humidity data exceed a preset ratio more than these the second air humidity data, it is judged that this flame ionization detector is lighted a fire successfully.
Patent of the present invention is by designing a kind of flame ionization detector igniting judgment means, it is possible to judges whether hydrogen is lighted accurately, decreases instrument maintenance work amount and the artificial inaccurate situation of judgement existed, also improve the cycle of operation of instrument simultaneously.
Accompanying drawing explanation
Fig. 1 is the igniting judgment means schematic diagram of the flame ionization detector according to one embodiment of the invention；
Fig. 2 is the schematic diagram of the flame ionization detector according to one embodiment of the invention；
Fig. 3 is the flow chart of the igniting determination methods according to one embodiment of the invention.
Wherein, accompanying drawing labelling:
1 igniting judgment means
2 flame ionization detectors
11 controllers
12 first humidity sensors
13 second humidity sensors
14 display devices
Detailed description of the invention
Refer to Fig. 1, Fig. 2 and Fig. 3, Fig. 1 is the igniting judgment means schematic diagram of the flame ionization detector according to one embodiment of the invention.Fig. 2 is the schematic diagram of the flame ionization detector according to one embodiment of the invention.Fig. 3 is the flow chart of the igniting determination methods according to one embodiment of the invention.Flame ionization detector 2 is lighted after successfully at hydrogen, and combustion of hydrogen can produce substantial amounts of aqueous vapor, and wherein the aqueous vapor above flame ionization detector 2 is comparatively concentrated, and causes that the air humidity above flame ion increases.The present invention arranges two each and every one humidity sensors, one is used for detecting the air humidity being mixed with burning aqueous vapor above flame ionization detector 2, another one is in unexpected (the present embodiment employing 20 centimetres of distance flame ionization detector 2 one predeterminable range, but be not limited to this) beyond normal air environment in, for detecting the air humidity of conventional environment.Hydrogen is lighted after successfully, it is positioned at the humidity sensor detection signal above flame ionization detector 2 to increase, and the humidity sensor signal that is arranged in normal air environment is constant or varies less, and judges that whether hydrogen is ignited by the increase of two humidity sensor differences.
This igniting judgment means 1 comprises controller the 11, first humidity sensor the 12, second humidity sensor 13 and display device 14.
When this igniting judgment means 1 works, this first humidity sensor 12 is positioned over the top of flame ionization detector 2, for detecting the air humidity above this flame ionization detector 2；This second humidity sensor 13 is placed in surrounding, for detecting the air humidity of surrounding.In general the distance between this second humidity sensor 13 and this first humidity sensor 12 should be greater than 20cm, but is not limited, and those skilled in the art can proper transformation distance according to actual needs.When this flame ionization detector 2 is not lighted a fire, through the calculating of controller 11, the difference of two sensors should be less than 1%.After this flame ionization detector 2 is lighted a fire, the humidity of the humidity sensor surrounding air above hydrogen flame increases, sensing data can have greatly changed, the sensor other with controller has a difference, controller calculates through amplifying, and difference reaches more than 30%, namely can determine whether that hydrogen is lighted, meanwhile, controller can light hydrogen flame ignition success display lamp.
In the present embodiment, have employed two humidity sensors, be respectively used for measuring the air humidity above flame ionization detector 2 and the air humidity in surrounding.But those skilled in the art suitably change with condition according to actual needs.Such as in another embodiment of the application, igniting judgment means 1 only comprises a humidity sensor 1, is arranged on the top of flame ionization detector 2, for measuring the air humidity above flame ionization detector 2.Meanwhile, this air humidity and a preset value are compared by controller 11, when this air humidity value exceedes this preset value, then are judged to light a fire successfully.
Patent of the present invention is by designing a kind of flame ionization detector igniting judgment means, it is possible to judges whether hydrogen is lighted accurately, decreases instrument maintenance work amount and the artificial inaccurate situation of judgement existed, also improve the cycle of operation of instrument simultaneously.