JP5180952B2 - Specific gas concentration meter - Google Patents

Description

  The present invention relates to a specific gas concentration meter used for monitoring or controlling the concentration of a specific gas (for example, oxygen, carbon dioxide, etc.) in a measurement target gas inside a package of food or pharmaceutical bag packaging.

  In recent years, methods for keeping freshness as long as possible have been developed in the packaging means for fresh foods such as fruits and vegetables, seafood, meat, etc. by utilizing the evolution of packaging materials and low oxygen gas replacement packaging technology. In that case, in order to confirm whether or not the inside of each package body is in a low oxygen state, there is a demand to check the inside of the package body individually for quality control.

  In response to the above-described demand, in the conventional specific gas concentration meter, as shown in FIG. 7, the first background art uses the measurement target gas 151 inside the package body as a medium with the syringe 106 as a medium, and the tip of the syringe 106 inside the package body. After the hollow needle 122 is pierced and the measurement target gas 151 is collected, the measurement target gas 151 is injected into the gas injection port 128 of the specific gas concentration meter 101 main body 103, and the specific gas concentration meter 101 contains the specific gas 152. The concentration was measured.

  Further, in the second background art, as shown in FIG. 8, an introduction tube 227 for injecting the measurement target gas 251 is connected to the gas injection port 228 of the specific gas concentration meter 201, and a hollow needle 222 is provided at the tip thereof. By using the specific gas concentration meter 21 connected to the probe 22 to release the protective block 223 of the hollow needle 222 of the probe 202, the hollow needle 222 is pierced into the package 205, and the measurement target gas 251 is collected. Under the circumstances, the measurement start switch 229 is operated to operate the suction pump 234 provided on the back of the specific gas concentration meter 201 main body 223, but the measurement target gas 251 in the package 205 is sampled. Thus, the concentration of the specific gas 252 was measured.

  Patent Document 1 provides a mechanism for protecting the needle when the hollow needle 322 at the tip of the syringe 306 is pierced through the object, and the tip of the hollow needle 322 when the measurement target gas 351 is collected using the syringe 306. It is described that protection from leakage due to diffusion of the gas to be measured 351 from the air and breakage when the hollow needle 322 is pierced.

JP-A-11-148924

Catalog of Toray Engineering Co., Ltd. regarding zirconia oxygen analyzer Catalog of other companies regarding zirconia oxygen analyzer

  In the first background art, since the operation of collecting the measurement target gas using the syringe as a medium and injecting it from the gas injection port of the specific gas concentration meter is necessary, the operation is complicated and takes time. . In addition, when the gas to be measured is injected from the syringe into the specified gas concentration meter, the measured value varies depending on the pressure. Therefore, it is necessary to inject the measured gas into the specified gas concentration meter body at a constant flow rate and pressure. It was done. In addition, when handling the syringe, there is a risk that the hollow needle at the tip is stuck in the hand, and the work is naturally carefully performed, which takes time.

Also, in the second background art, after the needle at the tip of the probe connected to the specific gas concentration meter main body is pierced, the measurement start switch is manually operated to start the subsequent measurement. There is a problem that the operation is complicated and takes time.

The first invention of the present application is a specific gas concentration meter comprising a probe for collecting a measurement target gas inside a package and a main body for measuring a specific gas concentration of the measurement target gas . at least, Togedorisuru a sensor unit for measuring a specific gas, comprising a suction pump, said suction pump is a diaphragm pump the exhaust side through the air, a needle of the probe tip to the measurement target gas in said packaging body portion based on the measurement start signal obtained by a call the sensor unit together with the suction pump starts operating to start measurement "that is characterized.

(Operation / Effect) In the first invention, the main body of the specific gas concentration meter and the probe are connected using an introduction tube, a hollow needle is provided at the tip of the probe, and the hollow needle is pierced inside the package. The gas to be measured is sampled and measured. In this case, in the present invention, the suction pump is started to operate with the contact electrode ON state as a trigger for the concentration measurement start signal, so that the hollow needle at the tip of the probe connected to the specific gas concentration meter is inserted into the package. The measurement of the specific gas concentration can be started at the same time as the sampling of the measurement target gas starts at the moment of passing. By this structure, without newly performing a manual operation of the measurement start switch of the specific gas concentration meter body measurements Ru is started. Since there is no need to operate the measurement start switch, there is an advantage that the specific gas concentration meter probe can be used to concentrate on the work of collecting the gas to be measured inside the package.

A second invention of the present application, the probe for collecting a measurement target gas "packing body portion is composed of the protective block for protecting a hollow needle for collecting gas to be measured of the packing body portion said hollow needle, said protective block A measurement start switch for detecting the movement of the gas as a measurement start signal is provided, and measurement of a specific gas concentration is started by a signal from the measurement start switch.

  (Operation / Effect) In the second invention, as in the first invention, when the measurement of the specific gas concentration is started immediately after the start of collection of the measurement target gas, the specific gas concentration is used as a measurement start signal for starting the measurement. The probe connected to the meter is configured so that the lock release switch is operated and the hollow needle protrudes from the protective block by pressing the probe against the package to collect the gas to be measured. At the same time, the contact electrode is on. The measurement start signal is detected and measurement of the specific gas concentration of the measurement target gas is started. With this configuration, the measurement time can be shortened and the concentration of the specific gas can be measured instantaneously, so that the specific gas concentration can be measured with a very small amount of gas to be measured.

According to a third aspect of the present application, “ a main body for measuring a specific gas concentration includes at least a sensor unit for measuring a specific gas, a suction pump, and a pressure sensor , and pressure variation of the pressure sensor is used as a concentration measurement start switch. It is characterized by that.

  (Operation / Effect) In the third invention, as in the second invention, when the measurement of the specific gas concentration is started immediately after the start of collection of the measurement target gas, the system of the specific gas concentration meter is used as a measurement start signal to start the measurement. Among these, a pressure sensor is installed between the sensor unit of the main unit and the suction pump, and the measurement target gas in the main unit of the specific gas concentration meter is based on the fluctuation of the pressure of the measurement target gas when sampling of the measurement target gas starts. By operating the suction pump, the specific gas concentration measurement can be started simply by inserting the hollow needle at the tip of the probe into the package, the measurement time can be shortened, and the specific gas concentration can be measured with a simple operation.

According to a fourth aspect of the present application, “ a main body for measuring a specific gas concentration includes at least a sensor unit for measuring a specific gas, a suction pump, and a flow sensor , and the flow rate variation of the flow sensor is a concentration measurement start switch. It is characterized by that.

  (Operation / Effect) In the fourth invention, as in the second invention, when the measurement of the specific gas concentration is started immediately after the start of collection of the measurement target gas, the system of the specific gas concentration meter is used as a measurement start signal to start the measurement. In this case, a flow sensor is installed between the sensor unit of the main unit and the suction pump, and the measurement target gas in the main unit of the specific gas concentration meter is based on the change in the flow rate of the measurement target gas when sampling of the measurement target gas starts. By operating the suction pump, the specific gas concentration measurement can be started simply by inserting the hollow needle at the tip of the probe, the measurement time can be shortened, and the specific gas concentration can be measured with a simple operation.

According to a fifth invention of the present application, “in the specific gas concentration meter, the probe for collecting the measurement target gas inside the package protects the hollow needle for collecting the measurement target gas inside the package and the hollow needle. It consists protection block, when the long hollow needle from said protective block is left in a state of protruding, it has to notify senses an abnormality of the specific gas concentration meter "be characterized.

  (Operation / Effect) In the fifth aspect of the invention, the contact point is used to prevent the hollow needle at the tip of the probe from being left unprotected for a long time without being protected by the protection block during the measurement of the specific gas concentration meter of the present invention. It has a function to detect and notify abnormalities for safety protection of the hollow needle and protection from sharp parts of the hollow needle to the operator when the electrode has been on for a long time and has been left unattended. To do. Thereby, it can protect from the damage received from handling of a probe, the hollow needle of the front-end | tip, and specific gas concentration meter.

  According to the present invention, in the specific gas concentration meter constituted by the probe for collecting the measurement target gas inside the package and the main body for measuring the specific gas concentration of the measurement target gas, the probe mechanism or the measurement unit of the main body is provided. When operating as a specific gas concentration measurement start signal using the pressure and flow fluctuations provided in the sensor, start the measurement at the same time as the hollow needle at the tip of the probe is pierced into the package without operating the measurement start switch. Can do.

  Therefore, in accordance with the timing of acquisition of the measurement target gas inside the package, the measurement of the concentration of the specific gas is started with the specific gas concentration meter. With respect to the measurement, the operator can concentrate on the piercing operation of the hollow needle into the package body along with the simplification of the operation, so that the operation can be performed efficiently and in a short measurement time.

  In addition, by providing the contact electrode, a warning is issued from the protection of the hollow needle and the safety considerations for the operator when the contact electrode is in an on state for a long time.

The whole block diagram of the specific gas concentration meter of the present invention. Diagram for explaining the operation of the connected profiles over blanking the specific gas concentration meter of the present invention. Diagram for explaining the operation of the connected profiles over blanking the specific gas concentration meter of the present invention. The figure explaining the detection using the pressure sensor of the measurement start signal of the specific gas concentration meter of this invention. The figure explaining the detection using the flow sensor for the measurement start signal of the specific gas concentration meter of the present invention. The flowchart explaining the measurement operation | movement of the specific gas concentration meter of this invention. The figure explaining the 1st measurement example of the conventional specific gas concentration meter. The figure explaining the 2nd measurement example of the conventional specific gas concentration meter.

  FIG. 1 shows an overall configuration diagram of a specific gas concentration meter 1 of the present invention. The specific gas concentration meter 1 includes a main body 3 that measures a specific gas concentration, a probe 2 that collects a measurement target gas 51, and a cable 4 that connects between them. The cable 4 includes three signal wires 41 that later transmit a measurement start signal from the contact electrode 25 to the main body 3 and an introduction tube 27 that delivers the measurement target gas 51 from the probe 2 to the main body 3.

FIG. 3 is a diagram illustrating the operation of the probe 2, and includes a hollow needle 22 that penetrates the inside of the package 5 and a protective block 23 that protects it at the distal end portion of the case 21 that forms the probe 2. Also, as in the diagram showing the operation of the profile over Bed 2 in FIG. 2, as the hollow needle 22 is Tsukidaseru, the back of the hollow needle 22, a spring 26 between the casing 21, the hollow needle 22 is fixed in the probe 22. The lock release switch 24 provided in the case 21 is operated. As shown in FIG. 2B, when the probe 2 is pressed against the package body 5 and pressed, the spring 26 is compressed and the hollow needle 22 protrudes from the protective block 23. The spring 26 is turned on when the spring 26 is compressed and the contact of the contact electrode 25 is cut off, and the suction pump 34 in the main body 3 operates to trigger the measurement of the concentration of the specific gas 52. 2B protrudes from the protective block 23 to such a length that the measurement target gas 51 can be collected, and penetrates through the hollow needle 22 into the package 5 as shown in FIG. 3B. The hollow needle 22 protrudes as possible.

  Further, the hollow needle 22 is pierced inside the package 5, and the measurement target gas 51 starts to be collected, and is sent to the main body 3 through the cable 4 coupled to the main body 3 through the introduction tube 27 connected to the hollow needle 22. The measurement target gas 51 is sucked by the suction pump 34 in the main body 3 which has already started operation so that the measurement target gas 51 is carried to the main body 3 promptly.

  It is the timing of operation of the suction pump 34 for sucking the measurement target gas 51 from the inside of the package 5 described above. From the entire configuration of the specific gas concentration meter 1, the measurement start signal is obtained and the measurement start is started at the same time. start. The measurement start signal is transmitted from a measurement start switch 29 formed of the contact electrode 25 of the probe 2 or a change in the pressure sensor 35 or the flow sensor 36 installed on the main body 3 side as a trigger for the measurement start signal. In some cases. In addition, as long as the gas to be measured 51 is sucked by the suction pump 34 and emits a signal as a trigger for a measurement start signal notifying that the measurement of the specific gas 52 is possible, it is described in the embodiment of the present application. The measurement start signal is not limited, and other measurement start signals may be used.

  As shown in FIG. 1, the main body 3 is connected to an introduction pipe 27 included in the cable 4 connected to the probe 2 inside the main body case 31, and a sensor unit 33 for measuring a specific gas 52 is connected to the end of the main body 3 and then further introduced. The tube 27 is extended and a suction pump 34 is provided at the end.

  Moreover, FIG. 4 is a figure explaining the example of the main body 3 in the case of the following Example 3. FIG. A measurement start signal is triggered between the sensor unit 33 and the suction pump 34 as a device that is connected to the introduction pipe 27 covered with the cable 4 inside the main body case 31 and sucks the measurement target gas 51 to measure the specific gas 52. Is provided with a pressure sensor 35 for transmitting the following signal.

  FIG. 5 is a diagram for explaining an example of the main body 3 in the case of Example 2 below. A measurement start signal is triggered between the sensor unit 33 and the suction pump 34 as a device that is connected to the introduction pipe 27 covered with the cable 4 inside the main body case 31 and sucks the measurement target gas 51 to measure the specific gas 52. A flow sensor 36 is provided for transmitting a signal to be

  The main body 3 is provided with a sensor unit 33 for measuring the concentration of the specific gas 52 and a CPU 32 for controlling the flow sensor 36, the pressure sensor 35, and the suction pump 34. The data to be displayed on the prepared display 37 is organized and stored.

Here, the flow of the present invention will be described with reference to the flowchart of FIG. First, the specific gas concentration meter 1 and the package 5 to be measured are prepared. Next, the probe 2 (“probe” in FIG. 6 is synonymous with “probe” in the present specification) is held with a pencil as shown in FIG. 3, and the hollow needle 22 side is brought close to the package 5. The lock release switch 24 is released. Here, pressing the profile over Division Two in the package 5. At that time, the spring 26 in the probe 2 is compressed by the pressing force, and the contact of the contact electrode 25 is released to be turned on. When the contact electrode 25 is turned on, it is determined that the trigger of the concentration measurement start signal is turned on, and the suction pump 34 in the main body 3 starts operating, and the sensor unit 33 measures the concentration. The measurement data is notified to the CPU 32 in the main body 3 and specified on the display 37.

  Incidentally, the flowchart of the conventional concentration measurement described in Background Art-2 is described on the right side of FIG. 6 as a comparative example. In this case, the lock release switch 224 of the probe 22 is released, and It is necessary to manually turn on the provided measurement start switch 229, and in a short period of time, the measurement target gas 251 limited as a sample diffuses into the atmosphere through the main body 23. There is a possibility that it will be impossible to measure accurately.

  When collecting the measurement target gas 51 inside the package 5 through the hollow needle 22, the specific gas 52 of the measurement target gas 51 component sucked by the suction pump 34 in the main body 3 of the specific gas concentration meter 1 from that moment. If the concentration of the gas to be measured is not measured, the amount of the measurement target gas 51 in the package 5 is limited as long as the suction pump 34 is sucking. It spreads inside. The background art describes an example in which the measurement start switch 129 is operated on the main body 103 of the specific gas concentration meter 101 as shown in FIG. 7 and then the measurement is performed. In order to accurately measure the concentration of the specific gas 152, there is a possibility that the opportunity will be missed in time.

  Here, when the measurement target gas 51 inside the package 5 is collected through the hollow needle 22, the ON state of the contact electrode is set so that the suction pump starts operation from the moment as a trigger for the concentration measurement start signal. However, even before the suction pump 34 is operated, from the moment when the measurement target gas 51 is collected, the measurement target gas is pressed by the pressure by pressing the probe 2 to pierce the hollow needle 22 through the package 5. 51 is sent to the introduction tube 27 through the hollow needle 22. At that time, since the diaphragm pump is used as a pump specification even before the suction pump 34 is operated, the gas is communicated with the atmosphere. Enter from the moment.

  The required amount of the specific gas 52 required for the measurement by the sensor unit 33 is approximately 3 ml. However, since the capacity of the suction pump 34 is set to 60 ml / min, the time required for the measurement is 3 seconds. Degree. In this case, the introduction pipe 27 that conveys the measurement target gas 51 included in the cable 4 after being collected has a pipe inner diameter of approximately 0.5 square millimeters to 0.6 square millimeters as a range in which concentration measurement is stably performed. The degree is preferred. Further, it is advantageous that the length of the introduction tube 27 covered with the cable 4 connecting the probe 2 and the main body 3 is short, but from the result of the implementation, even if it is 500 mm to 700 mm, there is no problem. There was no.

  In the first embodiment of the present invention, as a means for solving the above problem, the lock release switch 24 of the probe 2 is set so that the measurement work is started from the moment when the hollow needle 22 is pierced into the package 5. It is set so that the measurement can be started from the moment when the probe 2 is released and pressed into the package 5 and the hollow needle 22 is pushed out of the protective block 23 and compressed by the spring 26 being compressed.

  Thereby, the specific gas 52 density | concentration of the measurement object gas 51 component which passes the sensor part 33 in several seconds can be measured. The measurement data is sent to the CPU 32 and stored in a storage medium as necessary, and the instantaneous state is displayed on the display 37.

  In [Example 1], in order to collect the measurement target gas 51 through the probe 2, the contact electrode 25 that becomes the measurement start switch 29 by pressing the probe 2 against the package 5 after releasing the lock release switch 24 of the probe 2. As a trigger for the measurement start signal, the hollow needle 22 protrudes from the protective block 23, and the hollow needle 22 is pierced into the package 5 so that the measurement target gas 51 is connected to the cable by the suction pump 34 in the main body 3. 4, and the concentration of the specific gas 52 is started by the sensor unit 33 while passing through.

  In [Embodiment 2], as a trigger for starting the concentration measurement of the specific gas 52, as shown in FIG. 4, measurement of fluctuations in the pressure sensor 35 installed between the sensor unit 33 and the suction pump 34 in the main body 3 is started. Taking the signal as a trigger, the concentration measurement of the specific gas 52 is started.

  As described above, since the diaphragm pump is used as the suction pump 34, since the pressure fluctuation occurs from the moment when the measurement target gas 51 inside the package 5 is collected through the hollow needle 22, the first embodiment is used. It can be said that there is substantially no difference between the case where the contact electrode is turned on as a trigger for starting the operation of the suction pump 34 and starting the measurement by the sensor unit 33.

  Furthermore, as [Embodiment 3], as shown in FIG. 5, as a trigger for starting the concentration measurement of the specific gas 52, the fluctuation of the flow sensor 36 installed between the sensor unit 33 and the suction pump 34 in the main body 3. As a trigger for the measurement start signal, the concentration measurement of the specific gas 52 is started.

  Since a diaphragm pump is used as the suction pump 34 as in the third embodiment, the flow rate fluctuates from the moment when the measurement target gas 51 inside the package 5 is collected through the hollow needle 22. It can be said that there is substantially no difference between the case where the contact electrode in the example 1 is turned on as the trigger for starting the operation of the suction pump 34 and the start of measurement by the sensor unit 33.

  As described above, the above three examples have been shown as triggers for starting the concentration measurement of the specific gas 52. In addition, a measurement start signal suitable for triggering the concentration measurement from the system of the specific gas concentration meter 1 is a time. Any other method or apparatus may be used as long as it can be obtained by Lee.

  The lock release switch 24 of the protective block 23 at the tip of the probe 2 is released from the hollow needle 22 protected by the protective block 23 of the probe 2 in which the measurement target gas 51 inside the package 5 is connected to the main body 3. By pressing the probe 2, the hollow needle 22 protrudes from the protective block 23 to the tip, and the measurement target gas 51 is started to be collected by being inserted into the package 5. At the same time, the probe 2 that triggers a concentration measurement start signal. Since the inner contact electrode is turned on, the suction pump 34 in the main body 3 starts suction, and the sensor unit 33 in the main body 3 starts measuring the concentration of the specific gas 52.

  As described in the above embodiment, as the concentration measurement start signal, fluctuations of the fluid sensor 36 and the pressure sensor 35 installed in the main body 3 can be used as the concentration measurement start signal.

  Thereby, as described in the background art, the package 5 is pierced and collected through the hollow needle 22 at the tip of the syringe 6 for collecting the measurement target gas 51, and is extracted from the gas inlet 28 of the main body 3 of the specific gas concentration meter 1. At the same time that the hollow needle 22 at the tip of the probe 2 is pierced into the package body 5 without injecting it again or operating the measurement start switch 29 provided on the main body 3 or the like as a concentration measurement start signal. Since the concentration measurement of the specific gas 52 is started, the concentration of the specific gas 52 can be measured with high accuracy even for the measurement target gas 51 having a small volume.

1 (101) (201) Specific gas concentration meter 2 (202) Probe 21 Case 22 (122) (222) (322) Hollow needle 23 (223) Protection block 24 Lock release switch 25 Contact electrode 26 Spring 27 Introducing tube 28 ( 128) (228) Gas inlet 29 (129) (229) Measurement start switch 3 (103) (203) Main body 31 (131) (231) Main body case 32 CPU
33 Sensor part 34 (234) Suction pump 35 Pressure sensor 36 Flow rate sensor 37 (137) (237) Display 4 (204) Cable 41 Electric wire 5 (105) (205) Packaging 51 (151) (251) (351) measurement Target gas 52 (152) (252) (352) Specific gas 106 (306) Syringe

Claims (5)

In a specific gas concentration meter comprising a probe for collecting a measurement target gas inside a package and a main body for measuring a specific gas concentration of the measurement target gas,
The main body includes at least a sensor unit for measuring a specific gas and a suction pump,
The suction pump is a diaphragm pump whose exhaust side communicates with the atmosphere,
Based on the measurement start signal obtained by pierce the needle of the probe tip to the measurement target gas in said packaging body portion,
Specific gas concentration meter characterized that you the sensor unit together with the suction pump starts operating to start the measurement. Probe for collecting gas to be measured of the packing body portion is composed of the protective block for protecting a hollow needle for collecting gas to be measured of the packing body portion the hollow needle, to detect the movement of said protective block as the measurement start signal measurement The specific gas concentration meter according to claim 1, wherein a start switch is provided, and measurement of the specific gas concentration is started by a signal from the measurement start switch. 2. The main body for measuring a specific gas concentration includes at least a sensor unit for measuring a specific gas, a suction pump, and a pressure sensor , and pressure variation of the pressure sensor is used as a concentration measurement start switch. Specific gas concentration meter. The main body for measuring a specific gas concentration includes at least a sensor unit for measuring a specific gas, a suction pump, and a flow rate sensor , and a flow rate variation of the flow rate sensor is used as a concentration measurement start switch. Specific gas concentration meter. In the specific gas concentration meter according to any one of claims 1 to 4,
A probe that collects the measurement target gas inside the package includes a hollow needle that collects the measurement target gas inside the package and a protective block that protects the hollow needle,
A specific gas concentration meter, wherein when the hollow needle is left protruding from the protective block for a long time, an abnormality of the specific gas concentration meter is detected and notified.

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