CN105738549B - A kind of ammonia monitoring, alarming and switching method based on chromatography - Google Patents
A kind of ammonia monitoring, alarming and switching method based on chromatography Download PDFInfo
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- CN105738549B CN105738549B CN201610086558.5A CN201610086558A CN105738549B CN 105738549 B CN105738549 B CN 105738549B CN 201610086558 A CN201610086558 A CN 201610086558A CN 105738549 B CN105738549 B CN 105738549B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
- G01N2030/8804—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 automated systems
Abstract
The invention discloses a kind of ammonia monitoring, alarming based on chromatography and switching system and method, including the first monitoring point air inlet pipe, sampling air pump, six-plane valve, chromatographic column, thermal conductivity detector (TCD), monitoring alarm platform and purifier switching device；The monitoring alarm platform is connected with purifier switching device, the first solenoid valve, sampling air pump and six-plane valve circuit.The present invention can be achieved such as ammonia tank field or purifier and export the ammonia detection and alarm of multiple monitoring points, once ammonia leakage, which occurs, to alarm at the first time to remind disposal in time, improve the security of operation, while effectively prevent problem of environmental pollution；It can be sampled flexible selection and switching a little at the same time.Further, switching signal can be also exported by monitoring alarm platform and gives purifier switching device, carried out the automatic switchover of purifier, largely improve the effect and efficiency of purifying, there is higher application and dissemination.
Description
The application is entitled：A kind of ammonia monitoring, alarming based on chromatography and switching system and method, application number
For：2015100051440, the applying date is the divisional application of the patent of invention on January 6th, 2015.
Technical field
The present invention relates to a kind of gas detection alarm field, and in particular to a kind of ammonia monitoring, alarming and switching system and its
Corresponding monitoring, alarming and switching method.
Background technology
It is well known that ammonia, typically under liquefied ammonia environment, silication magnesium alloy are be unable to do without in silane by magnesium silicide method production technology
React generation silane and ammonia with ammonium chloride, then cryogenic separation ammonia and silane, remaining ammonia by sieve purification system into
Row removing.
In whole production process, there is liquid ammonia storage tank, silane reaction waste residue tank, ammonia tank field etc., including defeated ammonia pipeline and
Including valve etc., there is the presence of ammonia in each production link.Ammonia is once controlled bad or leaked, and not only drops silane
Product quality, is also easy to generation environment pollution, great security risk is brought to produced on-site staff.
Therefore, it is badly in need of a kind of technology and device that can effectively detect ammonia, on the one hand can improves silane product quality, separately
On the one hand the generation that liquefied ammonia can be controlled to reveal, to ensure the work safety of production scene personnel, avoids environmental pollution.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of ammonia based on chromatography
Gas monitoring, alarming and switching system, while provide a kind of for the ammonia monitoring, alarming and switching system based on chromatography
Method, ammonia monitoring, the report of monitoring point such as ammonia tank field or purifier outlet can be realized by the system and its corresponding method
It is alert, and the switching even switching of purifier a little is can be sampled, operational security is improved, effectively prevent environmental pollution.
Technical solution：In order to solve the above technical problems, the ammonia monitoring, alarming provided by the invention based on chromatography with
Switching system, including the first monitoring point air inlet pipe, sampling air pump, six-plane valve, chromatographic column, thermal conductivity detector (TCD), monitoring alarm
Platform and purifier switching device；Six ports of the six-plane valve number in order clockwise：One~port of port
Six；Quantity tube is connected between the port one and port four of the six-plane valve；
First monitoring point air inlet pipe is connected by the first solenoid valve with sampling air pump；It is described sampling air pump output with
The port six of six-plane valve connects；The port two of the six-plane valve is connected with carrier gas pipe；The six-plane valve leads to
Chromatographic column and thermal conductivity detector (TCD) are sequentially connected in series between mouth three and monitoring alarm platform；
The monitoring alarm platform and purifier switching device, the first solenoid valve, sampling air pump and six-plane valve electricity
Road connects.
Preferably, the second monitoring point air inlet pipe is still further comprised, second monitoring point air inlet pipe passes through the second electromagnetism
Valve is connected with sampling air pump；The second solenoid valve is connected with the monitoring alarm platform circuitry.
It is further preferred that more than two monitoring point air inlet pipe are further included in addition to the first monitoring point air inlet pipe, each monitoring
Point air inlet pipe is connected by its corresponding solenoid valve with sampling air pump；Each solenoid valve and monitoring alarm platform electricity
Road connects.
Preferably, first monitoring point air inlet pipe is the first monitoring point air inlet pipe arranged on purifier outlet..
Preferably, first monitoring point air inlet pipe is the first monitoring point air inlet pipe arranged on purifier outlet, described the
Two monitoring point air inlet pipe are the second monitoring point air inlet pipe arranged on ammonia tank field.
Preferably, the filler of the chromatographic column is GDX403.
Preferably, the monitoring alarm platform include the first controller and be connected with the first controller memory module,
Analog-digital converter, alarm module, power module；The thermal conductivity detector (TCD) 7 is connected by analog-digital converter with the first controller.
Preferably, the purifier switching device includes mixed gas entrance, second controller and purifying more than two
Device；The entrance of every group of purifier is connected by corresponding solenoid valve with mixed gas entrance, corresponding with each purifier entrance
Solenoid valve be connected with second controller；The purifier switching system is connected by second controller and monitoring alarm platform
Connect.
Meanwhile the in order to solve the above technical problems, ammonia based on chromatography provided by the present invention for said system
Monitoring, alarming and switching method, include the following steps：
The step of monitoring point is set：The corresponding each monitoring point air inlet pipe in each monitoring point is arranged on position to be monitored, wherein one
A monitoring point air inlet pipe is exported arranged on purifier；
The step of arrange parameter：The switch time of six-plane valve, the switching time of each monitoring point, preset alarm threshold are set
Value；
The step of switching monitored monitoring point intake channel；
The step of gathering sample gas；
The step of chromatography and detection；
The step of alarm is with switching：The electric signal that the step of chromatography and detection is exported is after analog-to-digital conversion, with quilt
The corresponding preset alarm threshold value of purpose monitoring point is compared, and the monitoring point is carried out if being equal to or more than the preset alarm threshold value
Corresponding alarm, at this time if the monitoring point of current monitor is arranged on the first monitoring point of purifier outlet, while exports purifier
Switching signal；
The step of purifier switches：The purifier switching signal exported according to alarm with the step of switching, carries out purifier
Automatic switchover.
Preferably, in the ammonia monitoring, alarming based on chromatography and switching method：
In the ammonia monitoring, alarming based on chromatography and switching system：Including two monitoring point air inlet pipe, difference
For the first monitoring point air inlet pipe and the second monitoring point air inlet pipe；The purifier switching device includes two groups of purifiers, is respectively
First purifier and the second purifier；The filler of chromatographic column is GDX403；
In the step of setting monitoring point：First monitoring point air inlet pipe is exported arranged on purifier, the second monitoring clicks through
Tracheae is arranged on ammonia tank field；
In the step of arrange parameter：The preset alarm threshold value includes the corresponding with the first monitoring point first default threshold
Value, the second predetermined threshold value corresponding with the second monitoring point, first predetermined threshold value are 50 × 10-6Mol/mol, described second is pre-
If threshold value is 1 × 10-3mol/mol。
Beneficial effect：Ammonia monitoring, alarming provided by the invention based on chromatography and switching system and method, utilize
For the chromatographic column and thermal conductivity detector (TCD) of ammonia, with reference to monitoring alarm platform, it can be achieved that such as ammonia tank field or purifier outlet
Multiple monitoring points ammonia detection and alarm, once occur ammonia leakage can first time carry out warning reminding staff into
Row disposal, improves the security of operation, while effectively prevent the problem of environmental pollution that ammonia leakage is brought；It can carry out at the same time
The flexible selection and switching of sampled point.
Further, when carrying out the ammonia detection and alarm of the corresponding monitoring point in purifier outlet, once detecting currently makes
When purifier fails and alarms, switching signal can be exported by monitoring alarm platform and gives purifier switching device, is carried out pure
Change the automatic switchover of device, both realized that the purifier activated came into operation, the purifier of inactivation carries out the automatic of activating and regenerating and cuts
Change jobs pattern, while having saved cycle and the cost of hand inspection, largely improves the effect and efficiency of purifying,
And the purified material in purifier can be economized on resources with Reusability, there is higher application and dissemination.
Brief description of the drawings
Fig. 1 is the structure diagram (six-plane of ammonia monitoring, alarming and switching system of the present invention based on chromatography
Valve is in OFF state)；
Fig. 2 is the structure diagram (six-plane of ammonia monitoring, alarming and switching system of the present invention based on chromatography
Valve is in ON states)；
Fig. 3 is that ammonia monitoring, alarming and the structure of in switching system monitoring alarm platform of the present invention based on chromatography show
It is intended to；
Fig. 4 is ammonia monitoring, alarming of the present invention based on chromatography and the structure of purifier switching device in switching system
Schematic diagram.
Embodiment
Structure diagram such as Fig. 1 (six-planes of ammonia monitoring, alarming and switching system of the present invention based on chromatography
Valve is in OFF state) and Fig. 2 (six-plane valve is in ON states) shown in, the structure diagram of monitoring alarm platform in system
As shown in figure 3, the structure diagram of purifier switching device is as shown in figure 4, with reference to the accompanying drawings and examples to this in system
Invention is further described.
System embodiment 1：As depicted in figs. 1 and 2, the monitoring of the ammonia based on chromatography that the system embodiment 1 provides
Alarm and switching system, including the first monitoring point air inlet pipe, the second monitoring point air inlet pipe, sampling air pump 3, six-plane valve, color
Compose column 6, thermal conductivity detector (TCD) 7, monitoring alarm platform and purifier switching device；Six equal up times of port of the six-plane valve
Pin numbers in order：One~port of port six；Quantity tube 5 is connected between the port one and port four of the six-plane valve.
First monitoring point air inlet pipe is exported arranged on purifier, and second monitoring point air inlet pipe is arranged on ammonia tank field.
First monitoring point air inlet pipe is connected by the first solenoid valve 1 with sampling air pump；Second monitoring point air inlet pipe passes through
Two solenoid valves 2 are connected with sampling air pump.Specifically in the system embodiment 1, first monitoring point air inlet pipe, the second monitoring
Point air inlet pipe is connected by a triple valve (not shown) with sampling air pump；First monitoring point air inlet pipe and Pneumatic three-way valve
Between be equipped with the first solenoid valve 1, second solenoid valve 2 is equipped between the second monitoring point air inlet pipe and Pneumatic three-way valve.Increase by one
The control of triple valve, further can effectively avoid interfering with each other and mixing for multi-channel sampling gas.
The output of the sampling air pump is connected with the port six of six-plane valve；The port two of the six-plane valve is with carrying
Tracheae connects, and port five is connected with evacuated tube；It is sequentially connected in series between the port three and monitoring alarm platform of the six-plane valve
Chromatographic column 6 and thermal conductivity detector (TCD)；
The monitoring alarm platform and purifier switching device, the first solenoid valve 1, second solenoid valve 2, triple valve, sampling
Air pump 3 and the connection of six-plane valve circuit.
The filler of chromatographic column 6 described in the system embodiment 1 is GDX403.
As shown in figure 3, the monitoring alarm platform includes the first controller and the storage mould being connected with the first controller
Block, analog-digital converter, alarm module, power module；The thermal conductivity detector (TCD) 7 is connected by analog-digital converter and the first controller
Connect.
As shown in figure 4, the purifier switching device include mixed gas entrance, second controller, the first purifier and
Second purifier；The entrance of first purifier is connected by the 3rd solenoid valve 8 with mixed gas entrance, the entrance of the second purifier
Connected by the 4th solenoid valve 9 with mixed gas entrance, the 3rd solenoid valve 8 and the 4th solenoid valve 9 are connected with second controller；
The purifier switching system is connected by second controller with monitoring alarm platform.
System embodiment 2：Ammonia monitoring, alarming and switching system provided in this embodiment based on chromatography, including the
One monitoring point air inlet pipe, sampling air pump, six-plane valve, chromatographic column, thermal conductivity detector (TCD), monitoring alarm platform and purifier switching
Device；Six ports of the six-plane valve number in order clockwise：One~port of port six；The six-plane valve
Port one and port four between be connected to quantity tube；
First monitoring point air inlet pipe is connected by the first solenoid valve with sampling air pump；It is described sampling air pump output with
The port six of six-plane valve connects；The port two of the six-plane valve is connected with carrier gas pipe, and port five is connected with evacuated tube；
Chromatographic column and thermal conductivity detector (TCD) are sequentially connected in series between the port three and monitoring alarm platform of the six-plane valve；
The monitoring alarm platform and purifier switching device, the first solenoid valve, sampling air pump and six-plane valve electricity
Road connects.
The filler of the chromatographic column is GDX403.
As shown in figure 3, the monitoring alarm platform includes the first controller and the storage mould being connected with the first controller
Block, analog-digital converter, alarm module, power module；The thermal conductivity detector (TCD) 7 is connected by analog-digital converter and the first controller
Connect.
As shown in figure 4, the purifier switching device includes mixed gas entrance, second controller and more than two pure
Change device；The entrance of every group of purifier is connected by corresponding solenoid valve with mixed gas entrance, each solenoid valve and the second control
Device connection processed；The purifier switching system is connected by second controller with monitoring alarm platform.
First monitoring point air inlet pipe is arranged on purifier outlet or ammonia tank field.
System embodiment 3：Essentially identical, the something in common with any one structure in system embodiment 1, system embodiment 2
It is not repeated, except that：Including two and more than two monitoring point air inlet pipe, each monitoring point air inlet pipe by its each
Corresponding solenoid valve is connected with sampling air pump；Between each solenoid valve and sampling air pump pneumatic multiple-way valve is can configure according to practical structures
Selection for monitoring point air inlet pipe.The solenoid valve being respectively connected with monitoring point air inlet pipe is electric with the monitoring alarm platform
Road connects.
The purifier switching device includes mixed gas entrance, second controller and purifier more than two；Every group
The entrance of purifier is connected by corresponding solenoid valve with mixed gas entrance, solenoid valve corresponding with each purifier entrance
It is connected with second controller；The purifier switching system is connected by second controller with monitoring alarm platform.
Embodiment of the method 4：System embodiment 1 is preferred embodiment, by taking system embodiment 1 as an example, illustrates the side of the present invention
Method embodiment 4, and the corresponding workflow of the present invention and principle：
The step of monitoring point is set：Corresponding first monitoring point air inlet pipe in the first monitoring point is arranged on purifier first
Outlet, corresponding second monitoring point air inlet pipe in the second monitoring point are arranged on ammonia tank field.
The step of arrange parameter：The switch time of six-plane valve, the switching time of monitoring point, preset alarm threshold are set
Value；The preset alarm threshold value includes the first predetermined threshold value corresponding with the first monitoring point, corresponding with the second monitoring point second
Predetermined threshold value, first predetermined threshold value are 50 × 10-6Mol/mol, second predetermined threshold value are 1 × 10-3mol/mol。
Monitor the first monitoring point：
The step of switching monitored monitoring point intake channel：First solenoid valve 1 is opened by monitoring alarm platform, closes the
Two solenoid valves 2；The port that triple valve is docked with the first solenoid valve 1 is opened, closing triple valve docks logical with second solenoid valve 2
Mouthful；Open sampling air pump 3.
The step of gathering sample gas：
OFF state (both sampling state) is in by monitoring alarm platform courses six-plane valve, in this case, sampling
After air pump 3 starts, the sample gas that the first monitoring point air inlet pipe collects is transported to the port six of six-plane valve, such as Fig. 1 institutes
Show, externally emptied after the port one, quantity tube 5, port four and the port five that are connected with port six successively；Carrier gas is logical flat through six
After the port two of face valve, the port three connected with port two, chromatographic column 6 is persistently inputted.
Then, ON states (both sample introduction states) are in by monitoring alarm platform courses six-plane valve.In this case,
After the sample gas that first monitoring point air inlet pipe collects is transported to the port six of six-plane valve, as shown in Fig. 2, via with leading to
The ports five of the connection of mouth six externally empty；Port two of the carrier gas through six-plane valve inputs, by the port connected with port two
One input quantity tube 5, the sample gas in quantity tube 5 is promoted by carrier gas inputs chromatographic column 6 after port four and port three successively,
Complete the sample introduction of sample gas.
The step of chromatography and detection：After sample gas enters chromatographic column 6 under the promotion of carrier gas, in the effect of chromatographic column
Lower to be separated ammonia and carrier gas, outflow exports after separated component to be measured further inputs thermal conductivity detector (TCD) TCD
Electric signal.
The step of alarm is with switching：It is and right by the electric signal that exports the step of chromatography and detection after analog-to-digital conversion
The preset alarm threshold value answered is compared, and is alarmed if being equal to or more than preset alarm threshold value, while export purifier and cut
Change signal；Both,
The electric signal input monitoring alarm platform that thermal conductivity detector (TCD) TCD is exported, is somebody's turn to do after analog-digital converter is changed
The corresponding data in first monitoring point (qualitative, quantitative data).First controller of monitoring alarm platform is by the data and memory module
First predetermined threshold value of middle storage is compared, and is such as equal to or more than the first predetermined threshold value, then starts alarm module and carry out first
The corresponding alarm in monitoring point, and export purifier switching signal and give purifier switching device.
The step of purifier switches：The second controller of purifier switching device receive carry out after purifier switching signal it is pure
Change device automatic switchover, both closed it is in running order in the corresponding solenoid valve 8 of the first purifier inactivated, opened
The second purifier corresponding solenoid valve 9 stand-by into activation, and start the first purifier inactivated and carry out activating and regenerating.It is real
Show the purifier activated to come into operation, the purifier of inactivation removes the automatic switchover operating mode for carrying out activating and regenerating.
Monitor the second monitoring point：
The step of switching monitored monitoring point intake channel：First solenoid valve 1 is closed by monitoring alarm platform, opens the
Two solenoid valves 2；The corresponding port closed triple valve and docked with the first solenoid valve 1, opens what triple valve was docked with second solenoid valve 2
Port；Open sampling air pump 3.
The step of gathering sample gas：
OFF state (both sampling state) is in by monitoring alarm platform courses six-plane valve, in this case, sampling
After air pump 3 starts, the sample gas that the second monitoring point air inlet pipe collects is transported to the port six of six-plane valve, such as Fig. 1 institutes
Show, externally emptied after the port one, quantity tube 5, port four and the port five that are connected with port six successively；Carrier gas is logical flat through six
After the port two of face valve, the port three connected with port two, chromatographic column 6 is persistently inputted.
Then, ON states (both sample introduction states) are in by monitoring alarm platform courses six-plane valve.In this case,
After the sample gas that second monitoring point air inlet pipe collects is transported to the port six of six-plane valve, as shown in Fig. 2, via with leading to
The ports five of the connection of mouth six externally empty；Port two of the carrier gas through six-plane valve inputs, by the port connected with port two
One input quantity tube 5, the sample gas in quantity tube 5 is promoted by carrier gas inputs chromatographic column 6 after port four and port three successively,
Complete the sample introduction of sample gas.
The step of chromatography and detection：After sample gas enters chromatographic column 6 under the promotion of carrier gas, in the effect of chromatographic column
Lower to be separated ammonia and carrier gas, outflow exports after separated component to be measured further inputs thermal conductivity detector (TCD) TCD
Electric signal.
The step of alarm is with switching：It is and right by the electric signal that exports the step of chromatography and detection after analog-to-digital conversion
The preset alarm threshold value answered is compared, and is alarmed if being equal to or more than preset alarm threshold value；Both,
The electric signal input monitoring alarm platform that thermal conductivity detector (TCD) TCD is exported, is somebody's turn to do after analog-digital converter is changed
The corresponding data in second monitoring point (qualitative, quantitative data), the first controller of monitoring alarm platform is by the data and memory module
Second predetermined threshold value of middle storage is compared, and is such as equal to or more than the second predetermined threshold value, then starts alarm module and carry out second
The corresponding alarm in monitoring point.
Above-mentioned carrier gas can be high-pure helium or High Purity Hydrogen.Switch monitored monitoring point air inlet above by monitoring alarm platform
The step of path, can be arranged as required to for manually triggering and/or according to default switching time and interval automatic trigger.It is above-mentioned
Each monitoring point air inlet pipe can certainly be arranged as required in other positions for monitoring of needs, as liquid ammonia storage tank area, silane are anti-
Answer waste residue tank field, defeated ammonia pipeline and valve neighbouring etc..The switch time of the six-plane valve, monitored monitoring point intake channel
Between switching time and interval, preset alarm threshold value etc. can flexibly set according to the actual requirements.
Above implementation column does not form restriction to the present invention, and relevant staff is in the scope without departing from the technology of the present invention thought
It is interior, carried out it is various change and modifications, all fall within protection scope of the present invention.
Claims (2)
1. a kind of ammonia monitoring, alarming and switching method based on chromatography, it is characterised in that include the following steps：
The step of monitoring point is set：The corresponding each monitoring point air inlet pipe in each monitoring point is arranged on position to be monitored, wherein the first prison
Measuring point air inlet pipe is exported arranged on purifier, and the second monitoring point air inlet pipe is arranged on ammonia tank field；
The step of arrange parameter：The switch time of six-plane valve, the switching time of each monitoring point, preset alarm threshold value are set；
The step of switching monitored monitoring point intake channel；
The step of gathering sample gas；
The step of chromatography and detection；
The step of alarm is with switching：The electric signal that the step of chromatography and detection is exported is after analog-to-digital conversion, with being monitored
The corresponding preset alarm threshold value in monitoring point is compared, and the monitoring point correspondence is carried out if being equal to or more than the preset alarm threshold value
Alarm, at this time as current monitor monitoring point be arranged on purifier outlet the first monitoring point, while export purifier switching
Signal；
The step of purifier switches：The purifier switching signal exported according to alarm with the step of switching, carries out purifier oneself
Dynamic switching；
This method is used for ammonia monitoring, alarming and switching system based on chromatography, which includes the first monitoring point air inlet
Pipe, the second monitoring point air inlet pipe, sampling air pump, six-plane valve, chromatographic column, thermal conductivity detector (TCD), monitoring alarm platform and purifying
Device switching device；
First monitoring point air inlet pipe, the second monitoring point air inlet pipe are connected by Pneumatic three-way valve with sampling air pump；First prison
The first solenoid valve is equipped between measuring point air inlet pipe and Pneumatic three-way valve, is equipped between the second monitoring point air inlet pipe and Pneumatic three-way valve
Second solenoid valve；
Six ports of the six-plane valve number in order clockwise：One ~ port of port six；The six-plane valve
Quantity tube is connected between port one and port four；The output of the sampling air pump is connected with the port six of six-plane valve；It is described
The port two of six-plane valve is connected with carrier gas pipe；Gone here and there successively between the port three and monitoring alarm platform of the six-plane valve
Connect chromatographic column and thermal conductivity detector (TCD)；
The monitoring alarm platform and purifier switching device, the first solenoid valve, second solenoid valve, Pneumatic three-way valve, sampling gas
Pump and the connection of six-plane valve circuit；
The purifier switching device includes mixed gas entrance, second controller and purifier more than two；Every group of purifying
The entrance of device is connected by corresponding solenoid valve with mixed gas entrance, solenoid valve corresponding with each purifier entrance with
Second controller connects；The purifier switching device is connected by second controller with monitoring alarm platform.
2. ammonia monitoring, alarming and switching method according to claim 1 based on chromatography, it is characterised in that：
In the step of arrange parameter：The preset alarm threshold value include the first predetermined threshold value corresponding with the first monitoring point,
The second predetermined threshold value corresponding with the second monitoring point, first predetermined threshold value are 50 × 10-6Mol/mol, described second is default
Threshold value is 1 × 10-3mol/mol。
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| CN201610086558.5A CN105738549B (en) | 2015-01-06 | 2015-01-06 | A kind of ammonia monitoring, alarming and switching method based on chromatography |
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| CN201610086558.5A CN105738549B (en) | 2015-01-06 | 2015-01-06 | A kind of ammonia monitoring, alarming and switching method based on chromatography |
| CN201510005144.0A CN104569203B (en) | 2015-01-06 | 2015-01-06 | A kind of ammonia monitoring, alarming based on chromatography and switched system and method |
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| CN102620957A (en) * | 2012-04-17 | 2012-08-01 | 南京特种气体厂有限公司 | Chromatographic analyzing and sampling system for bottled silane sample |
| CN203249902U (en) * | 2013-05-21 | 2013-10-23 | 杭州申昊信息科技有限公司 | Monitoring device for gas in transformer oil |
| CN103344735A (en) * | 2013-07-11 | 2013-10-09 | 国家电网公司 | Method for positioning discharging fault in gas insulated switchgear (GIS) |
| CN104569203A (en) * | 2015-01-06 | 2015-04-29 | 南京特种气体厂有限公司 | Ammonia gas monitoring alarming and switching system and method based on chromatographic analysis |
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