CN111948347A - Method and equipment for detecting content of nitrogen and oxygen in vacuum - Google Patents
Method and equipment for detecting content of nitrogen and oxygen in vacuum Download PDFInfo
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- CN111948347A CN111948347A CN202010824368.5A CN202010824368A CN111948347A CN 111948347 A CN111948347 A CN 111948347A CN 202010824368 A CN202010824368 A CN 202010824368A CN 111948347 A CN111948347 A CN 111948347A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M1/00—Stationary means for catching or killing insects
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3409—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
- A23L3/3418—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure, temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0073—Control unit therefor
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Abstract
The invention relates to a method for detecting the content of nitrogen and oxygen in vacuum, which comprises the following steps: vacuumizing the rigid airtight enclosure structure to a first pressure value; responding to the pressure in the rigid airtight enclosure structure being lower than the first pressure value, and filling nitrogen into the rigid airtight enclosure structure to a second pressure value; vacuumizing the rigid airtight enclosure structure to a first pressure value, and filling nitrogen to enable the pressure in the airtight enclosure to reach a third pressure value; and detecting the oxygen content in the rigid airtight envelope. According to the method, nitrogen is introduced into the vacuum rigid airtight enclosing structure, so that the air pressure in the rigid airtight enclosing structure is increased to the air pressure at which the oxygen content sensor can normally work, and the oxygen content in the rigid airtight enclosing structure can be accurately detected.
Description
Technical Field
The invention relates to the technical field of vacuum disinsection, in particular to a method and equipment for detecting the content of nitrogen and oxygen in vacuum inflation.
Background
Modified atmosphere storage of hypoxia and insecticidal techniques are increasingly being used. The traditional Chinese medicinal materials, tobacco, cultural relics, books, files and other articles can be subjected to insect killing, insect prevention, mildew prevention and bacteriostasis and long-term safe storage by a low-oxygen modified atmosphere storage technology; and the method has the advantages of no toxicity, environmental protection, safety, rapidness, economy, effectiveness, simple operation and the like. However, since the oxygen sensor in the vacuum environment cannot detect the oxygen content, most of the vacuum pest killing devices in the current market do not have the function of detecting the oxygen content, or the detection result is not accurate enough. These are all problems that the art needs to solve.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for detecting the content of vacuum charged nitrogen and oxygen, which comprises the following steps: vacuumizing the rigid airtight enclosure structure to a first pressure value; responding to the pressure in the rigid airtight enclosure structure being lower than the first pressure value, and filling nitrogen into the rigid airtight enclosure structure to a second pressure value; vacuumizing the rigid airtight enclosure structure to a first pressure value, and filling nitrogen to enable the pressure in the airtight enclosure to reach a third pressure value; and detecting the oxygen content in the rigid airtight envelope.
The method as described above, further comprising: before the steps of vacuumizing the rigid airtight enclosure structure to a first pressure value and filling nitrogen to enable the pressure in the rigid airtight enclosure structure to reach a third pressure value, repeating the following steps for preset times: vacuumizing the rigid airtight enclosure structure to a first pressure value; and in response to the pressure in the rigid airtight enclosure being lower than the first pressure value, filling nitrogen gas into the rigid airtight enclosure to a second pressure value.
The method as described above, further comprising: before the step of evacuating the rigid air tight enclosure to a first pressure value and charging nitrogen gas to bring the pressure inside the rigid air tight enclosure to a third pressure value, the method includes stopping the evacuation and the charging of nitrogen gas in response to an oxygen content in the rigid air tight enclosure being less than a first oxygen content threshold, wherein the first oxygen content threshold is 0.5%, preferably 0.1%.
The method as described above, wherein the third pressure value is atmospheric pressure or within 1000Pa of atmospheric pressure.
The method as described above, wherein the first pressure value is 10-30 kPa.
The method as described above, wherein the second pressure value is 50 to 105 kPa.
The method as described above, further comprising: and responding to the oxygen content value being larger than or equal to a second oxygen content threshold value, continuously vacuumizing and filling nitrogen, wherein the second oxygen content threshold value is 2%, and preferably 0.5%.
The method as described above, further comprising: a first time interval; introducing nitrogen into the airtight enclosure structure to enable the pressure in the airtight enclosure to reach a third pressure value; and detecting the oxygen content in the rigid airtight enclosure.
The method as described above, further comprising: and detecting the oxygen content in the rigid airtight enclosure at a second time interval.
The method as above, wherein the second time is greater than the first time.
According to another embodiment of the present invention, there is provided an apparatus for vacuum nitrogen-filled oxygen content detection, including: the rigid airtight enclosure structure has negative pressure resistance; the vacuum pump is connected with the rigid airtight enclosure structure; a nitrogen source connected to the rigid airtight envelope; a pressure sensor configured to detect a pressure within the rigid airtight enclosure; an oxygen content sensor configured to detect an oxygen content within the rigid airtight enclosure; and the controller controls the vacuum pump and the nitrogen source to work and is configured to respond to the requirement that the pressure value from the pressure sensor meets the third pressure value and start the oxygen content in the airtight enclosure of the oxygen sensor to detect.
The apparatus as above, wherein the oxygen content sensor is a pump suction sensor or a diffusion sensor.
The apparatus as described above, wherein the pumping oxygen sensor comprises a solenoid valve, a gas production pump and an oxygen sensor connected in sequence, wherein the flow rate of the gas production pump is about 0.5-1 liter/min.
The device as described above, wherein the oxygen content sensor further comprises a transducer connected to the oxygen sensor, and the output signal of the oxygen transducer is a 4-20mA current signal or a digital analog quantity.
The apparatus as above, wherein the controller is a programmable controller electrically connected to the oxygen transducer, the programmable controller configured to receive measurements from the pressure sensor.
The apparatus as described above, further comprising an input output device electrically connected to the controller, the controller configured to receive instructions from the input output device, detect oxygen content in the rigid airtight enclosure, and may record, display, and export data.
According to the method, nitrogen is introduced into the vacuum rigid airtight enclosing structure, so that the air pressure in the rigid airtight enclosing structure is increased to the air pressure at which the oxygen content sensor can normally work, and the oxygen content in the rigid airtight enclosing structure can be accurately detected.
Drawings
Preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an apparatus for oxygen content detection according to an embodiment of the present invention; and
FIG. 2 is a flow chart of a method of oxygen content detection according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.
Vacuum nitrogen charging is an important method for physically detecting the oxygen content. However, in a vacuum environment, the oxygen detection equipment is in a negative pressure state during operation, so that the oxygen content cannot be normally detected, the insecticidal process is blind, and the effect is unstable. Therefore, there is a need for an apparatus and method for detecting oxygen content in a vacuum.
This application is to the unable problem of normal use in the negative pressure state of oxygen check out test set, through filling nitrogen gas in rigidity airtight envelope, makes the state of a ordinary pressure or pressure-fired for oxygen check out test set can normally work, waits to detect and accomplishes, extracts nitrogen gas again, resumes vacuum environment.
FIG. 1 is a schematic diagram of an apparatus for oxygen content detection according to an embodiment of the present invention. As shown, the vacuum nitrogen filled oxygen content detection apparatus 100 includes a rigid airtight enclosure 110, a vacuum pump 120, a nitrogen source 130, a pressure sensor 140, an oxygen content sensor 150, and a controller 160. Wherein, the vacuum pump 120 is connected with the rigid airtight envelope 110 and electrically connected with the controller 160; the nitrogen source 130 is connected with the rigid airtight envelope 110 and electrically connected with the controller 160; the pressure sensor 140 is mounted on the rigid airtight enclosure 150, electrically connected to the controller 160, configured to detect the pressure within the rigid airtight enclosure 110; an oxygen content sensor 150 mounted to the rigid gas-tight enclosure 110 in electrical communication with the controller 160, configured to detect an oxygen content within the rigid gas-tight enclosure 110; the controller 160 is configured to, in response to the pressure value from the pressure sensor 140 being less than the atmospheric pressure, pass nitrogen gas into the rigid gas tight enclosure 110 using the nitrogen gas source 130 and detect the oxygen content within the rigid gas tight enclosure 110 using the oxygen content sensor 150. When the oxygen content is detected, the pressure in the rigid enclosure structure is normal pressure or close to normal pressure, and the difference value between the normal pressure and the pressure is generally not more than 1000 Pa.
In some embodiments, the rigid airtight envelope 110, and the devices and pipes connected thereto have negative pressure resistance, which can ensure the working stability of the devices in a vacuum environment.
In some embodiments, the oxygen content sensor 150 is a pump-suction sensor. In other embodiments, oxygen content sensor 150 is a diffused oxygen sensor. Since electronic components are easily damaged in a vacuum environment, the use of a pump-suction sensor is preferred, and the stability of the oxygen content sensor 150 can be improved.
In some embodiments, the oxygen content sensor 150 includes a solenoid valve 151, a gas production pump 152, and an oxygen sensor 153 connected in series. The electromagnetic valve 151 is connected to the interior of the rigid airtight enclosure 110, and the connection between the electromagnetic valve and the rigid airtight enclosure 110 is sealed to prevent air leakage. The solenoid valve 151 is electrically connected to the controller 160 and the gas pump 152. The electromagnetic valve 151 and the gas pump 152 are electrically connected to the controller 160, and the controller 160 controls the start/stop operation. The flow rate of the gas extraction pump 152 is about 0.5-1 liter/minute.
In some embodiments, oxygen content sensor 150 further includes an oxygen transducer 154 coupled to oxygen sensor 153. The oxygen transducer 154 is used to convert the physical quantity of oxygen into a standard electrical signal, wherein the output signal of the oxygen transducer 150 is a 4-20mA current signal or a digital analog quantity.
In some embodiments, the controller 160 is a programmable controller that is electrically connected to the oxygen transducer 154, the programmable controller configured to receive measurements from the pressure sensor 140 and to control the operation of the nitrogen source 130 and the vacuum pump 120. The controller 160 includes one or more Central Processing Units (CPUs), Graphics Processing Units (GPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or a combination thereof.
In some embodiments, the vacuum insecticidal apparatus 100 further comprises an input-output device 170 electrically connected to the controller 160, the controller configured to receive instructions from the input-output device, detect oxygen content in the rigid airtight enclosure, and may record, display, and export data. The input/output device 170 may be a touch screen, and may display data from the controller 160, or interact with the touch screen to generate information such as characters, numbers, or shapes, so as to achieve the purpose of inputting instructions.
FIG. 2 is a flow chart of a method of oxygen content detection according to one embodiment of the present invention.
At step 210, the rigid airtight enclosure is evacuated to a first pressure value. And starting a vacuum pump to vacuumize the rigid airtight enclosure until a certain set value is the first pressure value. In some embodiments, the first pressure value is about 10 to about 30 kPa. In some embodiments, the first pressure value is 30-50 kPa due to the weak vacuum resistance of the article to be treated. Further, the first pressure value may be set on the input-output device.
At step 220, the rigid air tight enclosure is inflated with nitrogen to a second pressure value. In some embodiments, the purity of the nitrogen is greater than 99%, preferably greater than 99.9%. It will be appreciated by those skilled in the art that the present application may also be used to introduce inert gas into the rigid gas tight enclosure for oxygen removal. In some embodiments, the oxygen sensor is periodically activated during the nitrogen purge to send oxygen data from the rigid gas tight enclosure to the controller. In some embodiments, the nitrogen gas can be filled for replacement, and then the vacuum pump is started to extract the gas in the rigid airtight enclosure, so that the oxygen content in the rigid airtight enclosure can be quickly reduced, and the energy is saved. Or alternatively starting the vacuum pump or the nitrogen source to realize rapid oxygen reduction.
In some embodiments, the second pressure value can be set according to the first pressure value and the characteristics of the object to be treated, so as to achieve the purpose of rapidly reducing oxygen without damaging the object to be treated. In some embodiments, the second pressure value is 1-5 times the first pressure value; in other embodiments, the second pressure value is 50 to 105 kPa.
In step 230, control determines whether the number of pump charges has been reached. If the number of pumping and charging times is reached, go to step 240; if the number of times of pumping is not reached, go to step 210. The times of vacuumizing and nitrogen filling are the times of vacuumizing and nitrogen filling. In some embodiments, a number of pump-ups and/or an oxygen content threshold may be set on the input output device 170; in other embodiments, the number of pump-ups and the oxygen level threshold are built into the system program. The determination of the pumping and charging times is related to factors such as the purity of the charged nitrogen, the first pressure value, the second pressure value and the like.
In other embodiments, the evacuation of nitrogen is stopped in response to the oxygen content in the rigid airtight enclosure being less than the first oxygen content threshold, and step 240 is performed.
In step 240, the rigid air-tight enclosure is evacuated to a first pressure value, and nitrogen is introduced to bring the pressure inside the rigid air-tight enclosure to a third pressure value. The third pressure value is normal pressure or within 1000Pa of the normal pressure, so that the object to be treated is in a state close to the normal pressure to ensure the safety of the object. Preferably, the third pressure value is normal pressure or slightly higher than normal pressure, so as to better maintain a low-oxygen environment in the rigid building envelope.
Optionally, at step 240, evacuating the rigid airtight enclosure to a first pressure value; a first time interval; and filling nitrogen to enable the pressure in the rigid airtight enclosure to reach a third pressure value. After the rigid airtight enclosure structure is vacuumized, the rigid airtight enclosure structure is in a negative pressure state; and the oxygen content is also in a low oxygen state. Because of the possibility of oxygen being trapped in the goods to be killed. This oxygen is gradually released under negative pressure, possibly changing the oxygen content in the rigid air-tight enclosure. If the oxygen content exceeds 3%, the low-oxygen insecticidal effect is no longer obtained. Even an increase in the oxygen content results in a prolonged insecticidal time, so that the insecticidal effect becomes uncontrollable. Therefore, it is very necessary to monitor the oxygen content change in the rigid airtight enclosure. According to one embodiment of the invention, the first time interval between oxygen measurements is about 1 to 5 hours, preferably 2 to 3 hours.
In step 250, the oxygen content in the rigid airtight enclosure is detected. When the controller detects the oxygen content, the electromagnetic valve and the gas production pump are started, gas is pumped to the oxygen sensor to detect the oxygen content, a detection signal is sent to the oxygen transmitter to be subjected to signal conversion, and the oxygen transmitter sends the converted signal to the controller.
At step 260, it is determined whether a first oxygen content threshold has been reached. If the oxygen content is greater than the first oxygen content threshold, go to step 240; if it is less than or equal to the first oxygen content threshold, step 270 is performed.
When the oxygen content in the rigid airtight enclosure is less than a set threshold, indicating that the oxygen content therein is reduced enough to achieve insecticidal purposes, the apparatus enters a maintenance state, i.e. the nitrogen charging and vacuum pumping apparatus is powered on, but not operated. In some embodiments, the oxygen content is set to 0.5%, preferably 0.1%. When the oxygen content is lower than 0.1%, the stored articles can be killed by 100% to kill imago, larva, ovum and pupa.
At step 270, the oxygen content in the rigid airtight enclosure is detected at intervals (i.e., a second time). Because the rigid airtight enclosure structure inevitably needs to exchange gas with the external environment, the oxygen content in the airtight enclosure still needs to be detected regularly, but because the airtightness is good, and the release of internal objects is slow, so that the oxygen growth is slow, the detection interval time at the stage can be set to be longer than the first time, for example, 6 to 12 hours.
In step 280, it is determined whether the oxygen content exceeds a second oxygen content threshold. If the detected value is smaller than the second oxygen content threshold value, go to step 270; if the detected value is greater than or equal to the second oxygen content threshold, go to step 290.
When the oxygen content exceeds the second oxygen content threshold value, the insecticidal effect is no longer available or the insecticidal efficiency is too low, and the airtight enclosure needs to be subjected to oxygen reduction replacement again. In some embodiments, the second oxygen content threshold is 2%, preferably 0.5%.
In step 290, in response to the oxygen content value being greater than or equal to the second oxygen content threshold, a vacuum is pulled and nitrogen is filled for replacement. If the detected oxygen content is still larger than or equal to the set threshold, continuously vacuumizing and filling nitrogen until the oxygen content is lower than the set threshold, and entering a maintaining state after the oxygen content reaches the set threshold until the preset disinsection time, and stopping the equipment.
In other embodiments, the rigid airtight enclosure structure can be filled with nitrogen to replace the gas in the rigid airtight enclosure structure and discharge oxygen in the rigid airtight enclosure structure, so as to achieve the purpose of reducing the oxygen content.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should fall within the scope of the present invention.
Claims (16)
1. A method for detecting the content of nitrogen and oxygen in vacuum comprises the following steps:
vacuumizing the rigid airtight enclosure structure to a first pressure value;
responding to the pressure in the rigid airtight enclosure structure being lower than the first pressure value, and filling nitrogen into the rigid airtight enclosure structure to a second pressure value;
vacuumizing the rigid airtight enclosure structure to a first pressure value, and filling nitrogen to enable the pressure in the airtight enclosure to reach a third pressure value; and
and detecting the oxygen content in the rigid airtight envelope.
2. The method of claim 1, further comprising: before the steps of vacuumizing the rigid airtight enclosure structure to a first pressure value and filling nitrogen to enable the pressure in the rigid airtight enclosure structure to reach a third pressure value, repeating the following steps for preset times:
vacuumizing the rigid airtight enclosure structure to a first pressure value; and
and in response to the pressure in the rigid airtight enclosure being lower than the first pressure value, filling the rigid airtight enclosure with nitrogen to a second pressure value.
3. The method of claim 1, further comprising: before the step of evacuating the rigid air tight enclosure to a first pressure value and charging nitrogen gas to bring the pressure inside the rigid air tight enclosure to a third pressure value, the method includes stopping the evacuation and the charging of nitrogen gas in response to an oxygen content in the rigid air tight enclosure being less than a first oxygen content threshold, wherein the first oxygen content threshold is 0.5%, preferably 0.1%.
4. The method of claim 1, wherein the third pressure value is atmospheric pressure or within 1000Pa of atmospheric pressure.
5. The method of claim 1, wherein the first pressure value is 10-30 kPa.
6. The process of claim 1, wherein the second pressure value is 50 to 105 kPa.
7. The method of claim 1, further comprising: and responding to the oxygen content value being larger than or equal to a second oxygen content threshold value, continuously vacuumizing and filling nitrogen, wherein the second oxygen content threshold value is 2%, and preferably 0.5%.
8. The method of claim 1, further comprising:
a first time interval;
introducing nitrogen into the airtight enclosure structure to enable the pressure in the airtight enclosure to reach a third pressure value; and
and detecting the oxygen content in the rigid airtight enclosure.
9. The method of claim 1, further comprising: and detecting the oxygen content in the rigid airtight enclosure at a second time interval.
10. The method of claim 8 or 9, wherein the second time is greater than the first time.
11. An apparatus for vacuum charged nitrogen oxygen content detection, comprising:
the rigid airtight enclosure structure has negative pressure resistance;
the vacuum pump is connected with the rigid airtight enclosure structure;
a nitrogen source connected to the rigid airtight envelope;
a pressure sensor configured to detect a pressure within the rigid airtight enclosure;
an oxygen content sensor configured to detect an oxygen content within the rigid airtight enclosure;
and the controller controls the vacuum pump and the nitrogen source to work and is configured to respond to the requirement that the pressure value from the pressure sensor meets the third pressure value and start the oxygen content in the airtight enclosure of the oxygen sensor to detect.
12. The apparatus of claim 11, wherein the oxygen content sensor is a pump suction sensor or a diffusion sensor.
13. The apparatus of claim 12, wherein the pump-type oxygen sensor comprises a solenoid valve, a gas production pump, and an oxygen sensor connected in series, wherein the flow rate of the gas production pump is about 0.5-1 liter/min.
14. The apparatus of claim 11, wherein the oxygen content sensor further comprises a transducer coupled to the oxygen sensor, the output signal of the oxygen transducer being a 4-20mA current signal or a digital analog.
15. The apparatus of claim 11, wherein the controller is a programmable controller electrically connected to the oxygen transducer, the programmable controller configured to receive measurements from the pressure sensor.
16. The apparatus of claim 11, further comprising an input-output device electrically connected to the controller, the controller configured to receive instructions from the input-output device, detect oxygen content in the rigid airtight enclosure, and may record, display, and export data.
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