JP2000009607A - Clean sample collecting apparatus and method for measuring clean value of equipment surface using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clean sample collecting apparatus capable of wholly wiping off a clean sample with respect to each of different objects under the optimum wiping-off pressure without generating irregularity and a cleaning degree measuring method not visually measuring a cleaning degree based on the clean sample by a worker and capable of accurately measuring a very small amt. of an adherend incapable of being discriminated by the naked eye. SOLUTION: A clean sample collecting apparatus in a method for measuring the cleanliness degree of equipment has a hollow outer cylinder 1 and the inner cylinder 2 arranged in the hollow outer cylinder 1 in an up and down movable manner and the energizing member 3 always energizing the inner cylinder 2 downwardly is provided in the hollow outer cylinder 1 and the pressure setting means setting the energizing force of the energizing member 3 to predetermined pressure is provided to the upper part of the hollow outer cylinder 1 and a wiping-off base material 4 is mounted on the bottom surface of the inner cylinder 2 in a detachable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clean sampling apparatus for collecting cleanliness of a cleaned wall of a facility in which contamination from organic matter becomes a problem, and a clean value of a surface of the facility using the same. Related to the measurement method.

[0002]

2. Description of the Related Art Conventionally, as a method for measuring this type of cleanliness,
There is a wiping method specified in JIS. This is done by wiping the washed wall with a white cloth or a filter paper instead, and then another part of the same area with a black cloth in the same way, and visually checking the adherence of the white cloth and the black cloth with the naked eye. To measure cleanliness.

[0003]

However, in such a measuring method, since a clean sample is manually collected by an operator, all the adhered substances are uniformly dispersed at an optimum wiping pressure for each of different objects. Since the cleanliness cannot be wiped off and the cleanliness based on the clean sample is measured by the operator's eyes, it is impossible to measure a small amount of deposits that cannot be discerned by the naked eye, and it must be accurately measured. There are problems such as not being able to do.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional measuring method, and to wipe all the clean samples with respect to different objects at optimum wiping pressures without any variation. A clean sampling device that can
It is an object of the present invention to provide a method of measuring the degree of cleanliness, in which a measurement of cleanliness based on a clean sample is not performed visually by an operator, and a very small amount of deposits that cannot be discriminated by the naked eye can be accurately measured. .

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a clean sampling apparatus for measuring the cleanliness of an equipment wall. A cylinder, and an inner cylinder disposed vertically movably in the hollow outer cylinder. An urging member for constantly urging the inner cylinder downward is provided in the hollow outer cylinder. Is provided with pressure setting means for setting the urging force of the urging member to a predetermined pressure, and a wiping base is detachably mounted on the bottom surface of the inner cylinder.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressure setting means is provided on the top plate of the hollow outer cylinder, and is provided with a screw rod which is screwed into a threaded portion, It has a fixing member for fixing to a position, and display means for displaying the predetermined position.

[0007] The invention described in claim 3 is the first or second invention.
In the invention described in the above, the operating member on the head of the screw rod,
A pressing member is attached to the lower end, and the pressing member has an abutting member abutting on a back surface thereof, and an indicator rod that protrudes to the outside through a vertical hole provided in the hollow outer cylinder on one side. And a display section of the set wiping pressure is provided on a side wall of the vertical hole.

According to a fourth aspect of the present invention, in the method for measuring the cleanness value of the equipment surface, the preset wiping pressure is calculated in advance according to the nature of the equipment, and the urging member is turned by rotating the screw rod of the clean sampler. With the urging force of the set wiping pressure, the screw rod is fixed, and a pre-dried and weighed wiping substrate is attached to the bottom surface of the inner cylinder of the clean sample collection device. It is brought into close contact with the measurement surface of the object to be measured and pressed until its surface coincides with the lower end surface of the hollow outer cylinder of the clean sampling apparatus. In this state, a predetermined inspection area (A) of the equipment
, The wiping substrate is removed from the bottom surface of the inner cylinder, and the wiping substrate is measured for its TOC value (T1) using a TOC meter. From the TOC value (T1), the wiping substrate and the wiping substrate are removed. Is the TOC value of another new pre-measured wipe substrate (T
2) is subtracted, and the difference (T1-T2) is divided by the inspection area (A) to obtain a residual TO per unit area of the inspection area.
The C value is calculated and used as an index value of cleanliness.

According to a fifth aspect of the present invention, in accordance with the fourth aspect of the present invention, the display section provided on the hollow outer cylinder is read by the pressing member of the clean sample collection apparatus, and the wiping pressure is set to the set wiping pressure. It is characterized by knowing that they match, and fixing the screw rod.

The TOC meter used in the present invention is an organic carbon meter, which heats a sample at 900 ° C. in a combustion furnace through which high-purity oxygen is passed to decompose organic substances into carbon dioxide. The carbon dioxide is measured with an infrared gas to determine the amount of organic carbon from the amount of carbon dioxide, which has been conventionally used.

The wiping substrate used in the present invention has a low organic carbon content, such as a membrane filter, a ceramic fiber, a quartz filter paper, etc., and is almost constant, and is conventionally used.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings has a hollow outer cylinder 1 and an inner cylinder 2 which is vertically movable within the hollow outer cylinder 1, and an upper flange of the inner cylinder. 17 is attached to a ring 16 fixed to the inner surface of the hollow outer cylinder 1 with screws 15,
It is supported at the lowest position as shown in FIG. A biasing member 3 made of a spring that constantly biases the inner cylinder 2 downward is provided in the hollow outer cylinder 1, and a pressure for setting the biasing force of the biasing member 3 to a predetermined pressure is provided above the hollow outer cylinder 1. A setting means is provided, and a wiping substrate 4 is detachably attached to the bottom surface of the inner cylinder 2 by an O-ring 5.

The pressure setting means includes a threaded rod 8 provided on the top plate 6 of the hollow outer cylinder 1 and screwed to the threaded portion 7, and a female threaded portion 7.
And a fixing member 9 consisting of a set screw for screwing the screw rod 8 into a predetermined position. The operating member 10 is attached to the head of the screw rod 8 and the pressing member 11 is attached to the lower end thereof. . The pressing member 11 has a top surface of the urging member 3 abutting on the back surface thereof, and has an indicator rod 13 protruding outside through a vertical hole 12 provided in the hollow outer cylinder 1 on one side. On the side wall of 12, a display section 14 for the set wiping pressure is provided.

When using this embodiment, a preliminary test is performed in the following procedure to set a wiping pressure. (1) A stain-causing substance such as beer or yeast is applied to equipment to be inspected or a specimen having the same material as the equipment to be inspected, and the applied substance is measured in volume or weight to clarify this. (2) Dirt is wiped using this wiping device, and the wiping pressure a at that time is measured. (3) The amount of dirt is measured by TOC analysis, and the wiping recovery rate b of the dirt substance is calculated. (4) The above a and b are measured at several stages, and the wiping pressure a that can realize the stable recovery rate b is set as the optimum wiping pressure. (5) Then, which display of the display unit 14 corresponds to the optimum wiping pressure is set.

Then, the fixing member 9 is operated to release the fixing of the screw rod 8, and the operating member 10 is operated to rotate the screw rod 8 to move the pressing member 11 up and down, and to be urged by the pressing member 11. The member 3 is compressed or expanded to increase or decrease its urging force, that is, the wiping pressure.
By reading the side wall of the vertical hole 12 from the display unit 14, when the wiping pressure matches the set wiping pressure, the rotation of the screw rod 8 is stopped and the screw rod 8 is fixed by the fixing member 9.

Next, the wiping substrate 4 is mounted on the bottom surface of the inner cylinder 2 with an O-ring 5 using tweezers or the like so that sebum of an operator does not adhere.

The operator holds the above-mentioned material in hand, and brings the wiping substrate 4 into close contact with the measurement surface, so that the wiping substrate 4 has a lower end surface of the hollow outer cylinder 1 as shown in FIG. And the pressing force of the urging member 3 on the surface of the wiping substrate 4 coincides with the set wiping pressure. Can be prevented.

In such a state, a predetermined inspection area A of the equipment to be inspected in the preliminary test is wiped with an optimum wiping pressure. This wiping area A is provisionally 100 ~ 2500cm ²
From the TOC analysis result of this sample,
The wiping area is set so that the amount of carbon per sample is 0.03 mg or more. In this case, the S / N is about 2, but the S / N can be further increased by setting the wiping area larger according to the required analysis accuracy.
Regarding the wiping area, the degree of contamination of the equipment to be inspected has no general degree.For example, even in the same factory, the surface of the flotation tank bottom valve and the surface of the yeast tank inner wall are different and even in the same equipment. We can predict that different factories will differ due to minor differences in equipment and working methods. Therefore, the provisional value 100
It is desirable to set for each type of specimen without being limited to 2500 cm ² .

(6) The wiping substrate 4 is removed from the bottom surface of the inner cylinder 2 using tweezers or the like so that the sebum of the worker does not adhere.

(7) The wiping base material 4 is converted into a well-known TOC meter (SSM-5000A, TOC-Shimadzu, manufactured by Shimadzu Corporation).
5000), the TOC value (T1) of the wiping substrate 4 is measured.

(8) From this TOC value (T1), the TOC value (T2) of a new pre-measured wiping substrate different from the wiping substrate 4 is subtracted, and the difference value (T1) -T2) is divided by the inspection area A to calculate a residual TOC value per unit area of the inspection area A, and an index value, which is an intermediate value of cleanliness, is determined according to the target equipment. In the case of a filtration tank or the like, the weight can be expressed as the weight of beer, and in the case of a yeast tank or the like, the weight can be expressed as the weight of yeast.
For this purpose, it is necessary to draw a calibration curve using a substance to be converted in advance, such as beer or yeast. It is not always necessary to convert to the substance, and the TOC measured value (unit: mg of carbon) can be used as an index of cleanliness.

[Experimental example 1] In the above,
Using a Millipore white membrane filter with a pore diameter of 0.45 μm and a diameter of 47 φmm as a wiping substrate, applying soil from yeast, burning it on a TOC meter, and conducting an experiment to measure the total carbon dioxide amount Is shown in FIG. From this, it was confirmed that the total amount of carbon dioxide measured by the TOC meter increased with the increase in the amount of soil (the amount of yeast), and that there was almost no difference between these numerical values depending on the lot of the membrane filter. I have.

[Experimental Example 2] The results of an experiment in which the above-mentioned Millipore white membrane filter was used as a wiping substrate and the difference in the total amount of carbon dioxide measured by a TOC meter was measured depending on the difference in the washing method. Is shown in FIG. The washing method at that time is alkali washing, hot water sterilization, and water washing.

[0024]

The present invention is as described above. According to the first aspect of the present invention, there is provided a clean sampling apparatus for measuring the cleanliness of equipment wall surfaces, comprising: a hollow outer cylinder; And a biasing member for constantly biasing the inner cylinder downward is provided in the hollow outer cylinder, and a biasing force of the biasing member is provided at an upper portion of the hollow outer cylinder. Is set to a predetermined pressure, a wiping base is detachably mounted on the bottom surface of the inner cylinder, and the pressure setting means is provided on the top plate of the hollow outer cylinder. It is provided with a screw rod to be screwed into the screw portion to be provided, a fixing member for fixing the screw rod at a predetermined position, a pressing member for pressing an urging member, and display means for displaying the predetermined position, The invention described in Item 3 is:
An operating member is attached to the head of the threaded rod, and a pressing member is attached to the lower end. The pressing member is in contact with the top of an urging member on the back surface, and has a vertical hole provided in a hollow outer cylinder on one side. There is an indicator rod that protrudes to the outside and is provided on the side wall of the vertical hole, and a display section of the set wiping pressure is provided. All the deposits can be wiped off, and there is an effect that there is no variation in the wiping and a small amount of deposits that cannot be discriminated with the naked eye can be accurately collected.

According to a fourth aspect of the present invention, there is provided a method for measuring a cleanness value of a facility surface, wherein a preset wiping pressure is calculated in advance according to the property of the facility, and a screw rod of the cleaning sample collecting device is rotated to attach the wiping pressure. The urging force of the urging member is used as the set wiping pressure, the screw rod is fixed, the wiping substrate is mounted on the bottom surface of the inner cylinder of the clean sampler, and the wiping substrate is brought into close contact with the measurement surface of the object to be measured. Let me
The surface is pressed until it coincides with the lower end surface of the hollow outer cylinder of the cleaning sample collecting apparatus. In this state, a predetermined inspection area (A) of the equipment is wiped, and the wiping substrate is removed from the inner cylinder. The TOC value (T1) is measured using a TOC meter after removing the base material from the bottom surface, and a new pre-measurement is performed from the TOC value (T1). The TOC value (T2) of the wiped substrate is reduced, and the difference value (T1-T
The invention according to claim 5, wherein 2) is divided by the inspection area (A) to calculate a residual TOC value per unit area of the inspection area, which is used as an index value of cleanliness. By reading the display portion provided on the hollow outer cylinder with the indicator rod provided on the pressing member, it is found that the wiping pressure matches the set wiping pressure, and the screw rod is fixed. With the removal pressure, all the deposits can be wiped off,
In addition, there is no variation in the wiping, and furthermore, it is possible to measure a very small amount of deposits that cannot be discerned by the naked eye, and since the carbon material contained in the wiping base is almost constant, the pure dirt content can be accurately measured. This has the effect.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a clean sampling apparatus according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a cross-sectional view showing a state in which the wiping base material is pressed against a wall surface of a target facility.

[FIG. 4] TOC according to the degree of contamination during the same test.
It is a drawing showing a measurement result.

FIG. 5 is a drawing showing the relationship between each cleaning process and the degree of cleaning.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow outer cylinder 2 Inner cylinder 3 Urging member 4 Wiping base material 5 O-ring 6 Top plate 7 Screw part 8 Screw rod 9 Fixing member 10 Operating member 11 Pressing member 12 Vertical hole 13 Indicator rod 14 Display part 15 Screw 16 Ring 17 Flange

Claims (5)

[Claims] 1. A hollow outer cylinder and an inner cylinder movably arranged in the hollow outer cylinder so as to be vertically movable, and an urging member for constantly urging the inner cylinder downward is provided in the hollow outer cylinder. Pressure setting means for setting the urging force of the urging member to a predetermined pressure is provided at an upper portion of the hollow outer cylinder, and a wiping base is detachably mounted on a bottom surface of the inner cylinder. Clean sampling equipment. 2. A pressure setting means, comprising: a screw rod provided on a top plate of a hollow outer cylinder and screwed to a screw portion; a fixing member for fixing the screw rod at a predetermined position; and a display means for displaying the predetermined position. The clean sampling apparatus according to claim 1, comprising: 3. An operating member is attached to the head of the threaded rod, and a pressing member is attached to the lower end. The pressing member abuts the top of an urging member on the back surface, and has a hollow outer cylinder on one side. 3. The indicator rod according to claim 1, wherein an indicator rod is provided which protrudes to the outside through the provided vertical hole, and a display section of a set wiping pressure is provided on a side wall of the vertical hole. Clean sampling equipment. 4. A predetermined inspection area (A) of equipment for measuring cleanliness is wiped off, the wiping base material is removed from the bottom surface of the inner cylinder, and the wiping base material has a TOC value (T.sub.T) using a TOC meter.
1), and from this TOC value (T1), the TOC of a new pre-measured wiping substrate different from the wiping substrate is measured.
The value (T2) is subtracted, and the difference value (T1-T2) is divided by the inspection area (A) to calculate a residual TOC value per unit area of the inspection area, which is used as an index value of cleanliness. A method for measuring the cleanliness of equipment surfaces characterized by the following. 5. The method according to claim 5, wherein a reading portion provided on the hollow outer cylinder is read by an indicating member of the clean sample collection device to find that the wiping pressure matches the set wiping pressure, and the screw rod is fixed. The method for measuring a cleanliness value of a facility surface according to claim 4.