CN205027697U - Photo -ionization detector - Google Patents
Photo -ionization detector Download PDFInfo
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- CN205027697U CN205027697U CN201520381479.8U CN201520381479U CN205027697U CN 205027697 U CN205027697 U CN 205027697U CN 201520381479 U CN201520381479 U CN 201520381479U CN 205027697 U CN205027697 U CN 205027697U
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Abstract
The utility model provides a photo -ionization detector, including the dust steam filter equipment that establishes ties in proper order, three solenoid valve, volatility gaseous filter equipment, the joint that converges, ionization chamber, be used for discharging the electromagnetic pump of the gas in the ionization chamber, and controller, three solenoid valve include the ambient air export and await measuring the gas outlet, converge and connect including awaiting measuring gas feed, pure air intlet and be used for the sharing gas outlet through await measuring gas or pure air, the ambient air export is passed through volatility gas filtering apparatus with pure air intlet connects, await measuring the gas outlet with the gas feed that awaits measuring connects, the sharing gas outlet with the ionization chamber is connected. Consequently, above -mentioned photo -ionization detector has regular self -cleaning and autozero function, and can strengthen the absorption efficiency of volatility gas filtering apparatus to volatility gas, prolongs volatility gas filtering apparatus's life.
Description
Technical field
The utility model relates to a kind of photoionization detector, particularly relates to a kind of photoionization detector with automated cleaning and zeroing function.
Background technology
In existing technology, a photoionization detector (hereinafter referred to as PID) is generally used for monitoring volatile gas.In commercial production safety, Monitoring Indoor Air Pollution, the fields such as environmental pollution monitoring are widely used.
PID uses ultraviolet light, and molecule, when ionizing potential energy lower than ultraviolet source, is turned to ion and the electronics of positively charged by high-energy photon ion.The electronics produced and ion are accelerated to form electric current by interelectrode high-voltage electric field.The electric current that this process produces is proportional to the concentration of ionization material.Therefore, the electric current of generation can be used for the concentration of measurement of species after being exaggerated collection.This process can be expressed as:
Wherein, R is ionogenic molecule; Hv is the energy of photon;
for the positive ion of ionization;
for the electronics of ionization.
Existing common PID generally includes ionization chamber, the UV-lamp for ionized molecule, the uviol lamp window injecting described ionization chamber for allowing ultraviolet beam to pass through, a pair high-field electrode, admission line and gas exhaust duct for accelerating.Detecting gas enters in described PID structure, and its pollutant carried can be attached on described uviol lamp window, and ultraviolet transmitance reduces, thus causes the baseline wander of PID.In order to eliminate PID baseline wander, lower described UV-lamp must be dismantled described ionization chamber, described uviol lamp and described uviol lamp window are cleaned.In industrial environment, complicated installation environment and testing environment make the maintenance of described PID loaded down with trivial details, limit the use of PID.
Utility model content
In view of this, necessaryly a kind of PID with regular automated cleaning and automatic zero set (AZS) function is provided, to solve the problem.
The purpose of this utility model is to provide a kind of PID, include the dust Mist filtration device of connecting successively, three-way solenoid valve, escaping gas filtration unit, conflux joint, ionization chamber and the electromagnetic pump for discharging the gas in described ionization chamber, described dust Mist filtration device is for filtering the dust steam in surrounding air and gas to be measured, described escaping gas filtration unit obtains pure air for the escaping gas filtered in surrounding air, described three-way solenoid valve comprises surrounding air outlet and gas vent to be measured, the described joint that confluxes comprises gas feed to be measured, pure air import and the shared gas outlet for passing through gas to be measured or pure air, described surrounding air outlet is connected with described pure air import by described escaping gas filtration unit, described gas vent to be measured is connected with described gas feed to be measured, described shared gas outlet is connected with described ionization chamber, wherein, described PID also includes the controller for controlling described three-way solenoid valve and described electromagnetic pump.
Based on above-mentioned, described dust Mist filtration device is connected with described three-way solenoid valve by air inlet pipeline.
Based on above-mentioned, described controller is single-chip microcomputer.
Compared with prior art, the PID that the utility model provides ionizes in ion chamber described in the ozone clean of formation and the dirt that UV-lamp is adhered to by pure ambient oxygen partial, avoids manual maintenance frequently; Also enable PID regularly automatic Calibration zero point, PID, after long-term non-maintaining operation, still can keep the accuracy of testing result, more intelligent; Described PID makes surrounding air first get rid of dust and steam through dust Mist filtration device, escaping gas is fallen to obtain pure air again through escaping gas filtration devices, avoid the absorptivity reducing volatile gas because of escaping gas filtration unit simultaneously stability dust and steam, thus enhance the absorption efficiency of escaping gas filtration unit to escaping gas, extend the serviceable life of escaping gas filtration unit; The joint that confluxes described in described PID adopts is connected with gas to be measured and pure air respectively and makes gas can not enter described escaping gas filtration unit in by path to make measurement result occur deviation.In addition, when pure air is by described ionization chamber, described controller carries out zero point correction to detecting device automatically, avoids and for a long time makes detecting device zero point drift and problem that the gas detect that brings is forbidden.
Accompanying drawing explanation
Fig. 1 is the PID structural representation that the utility model embodiment provides.
Wherein, the component symbol 1 in Fig. 1, dust Mist filtration device, 2, three-way solenoid valve, 3, escaping gas filtration unit, 4, conflux joint, 5, ionization chamber, 6, electromagnetic pump, 7, air inlet pipeline, 8, gas vent to be measured, 9, surrounding air outlet, 10, gas feed to be measured, 11, pure air import, 12, share gas outlet, 13, gas exhaust piping, 14, gas piping to be measured.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
Refer to Fig. 1, the utility model provides a kind of PID, comprises dust Mist filtration device 1, three-way solenoid valve 2, escaping gas filtration unit 3, the joint 4 that confluxes, ionization chamber 5 and the electromagnetic pump 6 for discharging the gas in described ionization chamber of connecting successively.Wherein, described dust Mist filtration device 1 is for filtering the dust steam in surrounding air and gas to be measured.Described escaping gas filtration unit 3 is for filtering escaping gas in surrounding air to obtain pure air.Described dust Mist filtration device 1 is communicated with described three-way solenoid valve 2 by air inlet pipeline 7.Described three-way solenoid valve 2 comprises gas vent 8 to be measured and surrounding air outlet 9.The described joint 4 that confluxes comprises gas feed 10 to be measured, pure air import 11 and for the shared gas outlet 12 by gas to be measured or pure air.Described surrounding air outlet 9 is connected with described pure air import 12 by described escaping gas filtration unit 3, described gas vent to be measured 8 is connected with described gas feed 10 to be measured by gas piping 14 to be measured, and described shared gas outlet 12 is connected with described ionization chamber 5 by pure air pipeline.Described PID also includes controller (not shown), and described controller is mainly used in switching pipeline and controlling described electromagnetic pump 6, and described controller is mainly through controlling described three-way solenoid valve 2 to switch pipeline.In the present embodiment, described controller is single-chip microcomputer, and described three-way solenoid valve 2 is two-bit triplet solenoid valve.Described electromagnetic pump 6 is also provided with gas exhaust piping 13.
Between the normal detection period of above-mentioned PID, gas to be measured is entered by described dust Mist filtration device 1, successively by described air inlet pipeline 7, described three-way solenoid valve 2 and described gas piping to be measured 14 after filter out dust steam, and enter into described ionization chamber 5 by by the gas feed to be measured 10 of the described joint 4 that confluxes and shared gas outlet 12, escaping gas now in gas to be measured ionizes in described ionization chamber 5, is detected; Then the gas to be measured after the ionization in ionization chamber 5 is discharged from described gas exhaust piping 13 through described electromagnetic pump 6.
When after detection a period of time, described PID enters the pattern of automated cleaning.Described controller controls described three-way solenoid valve 2 and switches, and filters out volatile gas obtain pure air in three-way solenoid valve 2 by the surrounding air after described dust Mist filtration device 1 filtration by escaping gas filtration unit 3.Now, close described gas piping to be measured 14, the joint 4 that confluxes described in pure air passes through enters into described ionization chamber 5.Oxygen molecule in surrounding air is ionized formation ozone, and pollutant is wherein removed by the ozone formed in ionization chamber 5, and pollutant being swept along by pure air is discharged from described gas exhaust piping 13.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (3)
1. a photoionization detector, it is characterized in that: it includes the dust Mist filtration device of connecting successively, three-way solenoid valve, escaping gas filtration unit, conflux joint, ionization chamber and the electromagnetic pump for discharging the gas in described ionization chamber, described dust Mist filtration device is for filtering the dust steam in surrounding air and gas to be measured, described escaping gas filtration unit obtains pure air for the escaping gas filtered in surrounding air, described three-way solenoid valve comprises surrounding air outlet and gas vent to be measured, the described joint that confluxes comprises gas feed to be measured, pure air import and the shared gas outlet for passing through gas to be measured or pure air, described surrounding air outlet is connected with described pure air import by described escaping gas filtration unit, described gas vent to be measured is connected with described gas feed to be measured, described shared gas outlet is connected with described ionization chamber, wherein, described photoionization detector also includes the controller for controlling described three-way solenoid valve and described electromagnetic pump.
2. photoionization detector according to claim 1, is characterized in that: described dust Mist filtration device is connected with described three-way solenoid valve by air inlet pipeline.
3. photoionization detector according to claim 1 and 2, is characterized in that: described controller is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520381479.8U CN205027697U (en) | 2015-06-04 | 2015-06-04 | Photo -ionization detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520381479.8U CN205027697U (en) | 2015-06-04 | 2015-06-04 | Photo -ionization detector |
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| Publication Number | Publication Date |
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| CN205027697U true CN205027697U (en) | 2016-02-10 |
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| CN201520381479.8U Active CN205027697U (en) | 2015-06-04 | 2015-06-04 | Photo -ionization detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092898A (en) * | 2016-08-04 | 2016-11-09 | 深圳市诺安环境安全股份有限公司 | Redundant online photoion analysis system and analysis method thereof |
| CN106290308A (en) * | 2016-08-04 | 2017-01-04 | 深圳市诺安环境安全股份有限公司 | Range-adaptive VOCs (volatile organic chemicals) online monitoring system and monitoring method |
| CN109073612A (en) * | 2016-07-29 | 2018-12-21 | 霍尼韦尔国际公司 | Photoionization detector automates zero level calibration |
| US11162917B2 (en) | 2019-02-28 | 2021-11-02 | Honeywell International Inc. | Device for improving gas detection in photoionization detector |
-
2015
- 2015-06-04 CN CN201520381479.8U patent/CN205027697U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073612A (en) * | 2016-07-29 | 2018-12-21 | 霍尼韦尔国际公司 | Photoionization detector automates zero level calibration |
| US10969371B2 (en) | 2016-07-29 | 2021-04-06 | Honeywell International Inc. | Photoionization detector automated zero level calibration |
| CN109073612B (en) * | 2016-07-29 | 2022-03-29 | 霍尼韦尔国际公司 | Automatic zero-order calibration of photoionization detectors |
| US11480554B2 (en) | 2016-07-29 | 2022-10-25 | Honeywell International Inc. | Photoionization detector automated zero level calibration |
| US11714073B2 (en) | 2016-07-29 | 2023-08-01 | Honeywell International Inc. | Photoionization detector automated zero level calibration |
| CN106092898A (en) * | 2016-08-04 | 2016-11-09 | 深圳市诺安环境安全股份有限公司 | Redundant online photoion analysis system and analysis method thereof |
| CN106290308A (en) * | 2016-08-04 | 2017-01-04 | 深圳市诺安环境安全股份有限公司 | Range-adaptive VOCs (volatile organic chemicals) online monitoring system and monitoring method |
| CN106290308B (en) * | 2016-08-04 | 2023-12-01 | 深圳市诺安智能股份有限公司 | Range self-adaptive VOCs on-line monitoring system and monitoring method |
| US11162917B2 (en) | 2019-02-28 | 2021-11-02 | Honeywell International Inc. | Device for improving gas detection in photoionization detector |
| US11604163B2 (en) | 2019-02-28 | 2023-03-14 | Honeywell International Inc. | Device for improving gas detection in photoionization detector |
| US11965855B2 (en) | 2019-02-28 | 2024-04-23 | Honeywell International Inc. | Device for improving gas detection in photoionization detector |
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| C14 | Grant of patent or utility model | ||
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Address after: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee after: Hanwei Technology Group Limited by Share Ltd Address before: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee before: Henan Hanwei Electronics Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |