JPH07111409B2 - Simple check jig for analyzer for ion activity measurement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention uses a slide-type ion activity measuring instrument to sample aqueous liquids such as alcoholic beverages, drinks, tap water, especially biological fluids (blood, urine, saliva, etc.). ) Is related to a jig for inspecting the function of an analyzer for quantitatively analyzing the activity (or concentration) of a specific ion in () by potentiometry.

(Prior Art) A slide type ion activity measuring instrument capable of spotting a liquid sample and measuring the ion activity of a specific ion contained therein is disclosed in JP-B-58-4981. -156848,
It is disclosed in JP-A-58-211648 and the like.

This slide-type ion activity measuring instrument (hereinafter, also referred to as “slide”) includes at least one pair of ion-selective electrodes composed of ion-selective electrodes that generate an electric potential corresponding to the ion activity of a specific ion. A reference liquid having a known ion activity of a specific ion and a sample solution having an unknown ion activity of the specific ion, which has a porous bridge arranged so as to connect between both electrodes of the ion selective electrode pair. Is applied to one and the other electrode of the ion selective electrode pair respectively, and when the interface of both liquids is brought into contact (liquid path) by the action of the porous bridge to establish electrical conduction, Since a potential difference occurs corresponding to the difference in the ion activity of the ions existing between the reference liquid and the sample liquid, a calibration curve obtained in advance by measuring this potential difference (the principle is the Nernst equation Ion activity of a specific ion in the sample solution based on a due) is adapted to determined.

In order to measure the ionic activity using such a slide-type ionic activity measuring instrument, it is preferable to use an analyzer having the functions of spotting and supplying the reference liquid and the sample liquid and measuring the potential difference. . Such analyzers are described, for example, in U.S. Pat. No. 4,257,862 and Japanese Patent Application No. 59-12794 (JP-A-60-155961). This type of conventional analyzer, after spotting the reference solution and the sample solution, sends a slide-type ion activity measuring instrument to the potential difference measuring section, where the potential measuring probe is brought into contact with both electrodes of the electrode pair, respectively. The configuration is such that the potential difference between the electrodes is measured.

By the way, in manufacturing and using the analyzer having the above-mentioned configuration, it is necessary to inspect whether or not the analyzer is in a normally operating state. That is, for example, the manufacturer needs to perform a shipping inspection and the like, while the service person and the user need to appropriately perform the above inspection for maintenance management and confirmation of measured values.

A simple check jig has been developed by the present applicant so that such an inspection can be performed easily (Japanese Patent Application No. Sho 62-62).
-94551, JP-A-63-228056).

(Problems to be Solved by the Invention) The simple check jig has substantially the same outer dimensions as the slide, and when the same operation as the potential difference measurement is performed, the both potential measurement probes are short-circuited or the electrical resistance is reduced. It was configured to connect both probes via. By checking the analyzer using this simple check jig, it is possible to confirm the presence or absence of contact failure or disconnection of the analyzer.

However, the above-mentioned simple check jig can detect these defects when contact failure, disconnection, etc. occur, but when measuring the ion activity by measuring the potential difference, the ion activity is measured by an analyzer. The amount is accurately measured,
Whether or not an accurate measured value is output from the analyzer cannot be inspected by the above-mentioned simple check jig, and for example, a solution having a known ion activity is prepared in advance and the ion activity is determined by using a slide. It is necessary to measure the quantity and inspect whether or not the measured value is accurate. Therefore, there is a problem that the above-mentioned simple check jig can be used only for performing extremely limited simple inspection. there were.

In view of the above problems, the present invention does not only prepare a solution or the like having a known ionic activity, but not only the contact failure or disconnection, but an accurate measured value is output when the ionic activity is measured. It is an object of the present invention to provide a simple check jig for an analyzer for measuring ion activity, which can be easily inspected whether or not it is performed.

(Means for Solving the Problems) One of the simple check jigs of the analyzer for measuring ion activity of the present invention is at least one pair of ion-selective electrodes that generate an electric potential corresponding to the ion activity of a specific ion. Using an ion activity measuring instrument having a porous bridge arranged so as to connect between both electrodes of this ion selective electrode pair, both electrodes of the ion selective electrode pair of the ion activity measuring instrument arranged at a predetermined position Is a simple check jig for inspecting the function of the analyzer for measuring the ion activity by measuring the potential difference between the electrodes by contacting each of the potential difference measurement probes, in place of the ion activity measuring instrument A support having an external dimension that can be placed at a predetermined position, and a pair of electrical conductors attached to the support and arranged at a position where the probe of the analyzer comes into contact. And a power supply which is attached to this support, and which causes a potential difference between the good electrical conductors of the pair to be approximately equal to the potential difference generated between the electrodes when the sample liquid and the reference liquid are conducted by the porous bridge. It is characterized by consisting of.

Further, another simple check jig of the present invention is provided with a power source for causing a potential difference, which is substantially equal to a potential difference generated between the electrodes, between the pair of good electrical conductors. Instead of the above, it is characterized by comprising a power source for causing a potential difference and an output impedance substantially equal to the potential difference and the output impedance generated between the both electrodes, between the pair of good electrical conductors.

(Operation) The support pair having the above-described external dimensions can be set in the potential difference measuring unit of the analyzer instead of the slide. When the simple check jig of the present invention is used, the probe is moved in the above state in the same manner as in the case of measuring the potential difference and brought into contact with an electric conductor of the jig, and the potential difference between the probes is substantially equal to the potential difference during the ion activity measurement. It is possible to detect a failure of the analyzer such as a contact failure or a disconnection, and also to check whether or not the analyzer accurately measures and outputs accurately.

In addition, not only the potential difference but also the output impedance can be simulated more accurately by constructing a simple check jig that has almost the same output impedance as when measuring the ion activity, and more accurate inspection can be performed. be able to.

It is also possible to check the directness of the analyzer measurement system by preparing a plurality of the above-mentioned simple check jigs that simulate the potential difference at high, medium and low ion activity, respectively. Become.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

First, an analyzer to which the simple check jig of the present invention is applied, and a slide type ion activity measuring instrument used for the analyzer will be described.

FIG. 1 shows an example of the above analyzer, and FIGS. 2, 3 and 4 show the essential parts thereof. As shown in FIG. 1, the outer surface of the analyzer 10 is a cover 11
The slide type ion activity measuring instrument (slide) 20 is set on the cover 11 and the opening 12 for spotting the reference solution and the sample solution and the slide 20 on which the potential difference measurement has been completed. And a discharge port 13 for discharging the. In addition, this analyzer 10 has a start button 1
4, an ion activity display unit 15, an ion activity recording unit 16 and the like are provided.

The mechanism shown in FIGS. 2, 3 and 4 is arranged below the portion where the opening 12 is provided, and is fixed to a flat instrument mounting table 30 and both ends of the instrument mounting table 30. The pair of side plates 31, 31 and the side plates 31, 31 are arranged in parallel with the instrument mounting table 30.
And six rods 32, 32, 33, 33, 34, 34 connecting the two. A liquid spotting portion 30A is provided in the center of the above-described equipment mounting table 30, and the potential difference side constant portion 3 is sandwiched across the liquid spotting portion 30A.
0B and a device discharging section 30C are provided. The device mounting table 30 is arranged in the cover 11 such that the liquid spotting section 30A is located directly below the opening 12. Further, in the potential difference measuring unit 30B, a through hole 35 is provided in the instrument mounting table 30, and a vertically movable heating plate 36 is incorporated in the through hole 35. A slide retainer plate 37 is provided at a position facing the heating plate 36 with a predetermined distance from the surface of the instrument mounting table 30. On the other hand, in the device discharging section 30C, the device mounting table 30 is provided with a slide discharging hole 38. The slide discharge hole 38 is formed larger than the slide 20 described above, and is connected to the discharge port 13 of the cover 11 through the inclined passage 39 and the opening 40 of the side plate 31.

A slide set hole (through hole) 41 is provided on the device mounting table 30.
An instrument holder 42 having is arranged. Both ends of the instrument holder 42 are slidably fitted to the pair of rods 32, 32. Therefore, the instrument holder 42 is mounted on the instrument table 30 in the directions of arrows A and B (that is, liquid spotting). Part 30A,
It is movable so that the potential difference side constant section 30B and the instrument discharge section 30C can be sequentially moved. The slide retainer plate 37
Is arranged at a distance greater than the thickness of the instrument holder 42 from the surface of the instrument mounting table 30 so that the instrument holder 42 can be moved to above the heating plate 36. On the other hand, below the instrument mounting table 30, a holder moving table 43 is arranged. Both ends of the holder moving base 43 are slidably fitted on the pair of rods 33, 33, and therefore the holder moving base 43 is also movable in the directions of the arrows A and B. A female screw 44 (see FIG. 4) is attached to the lower part of the holder moving base 43, and the female screw 44 is screwed into a drive screw (female screw) 45 arranged in parallel with the rod 33. ing.
The drive screw 45 is rotated in the forward and reverse directions by the motor 46 fixed to the side plate 32 via the gears 47 and 48. By rotating the drive screw 45 in this manner, the holder moving table 43 Moves in the directions of arrows A and B. At both ends of the holder moving table 43, connecting members protruding upward, respectively.
49 is provided, and the magnet 50 is fixed to the rear surface of these connecting members 49 (that is, the surface facing the tool discharge part 30C side when the holder moving base 43 is near the liquid spotting part 30A). On the other hand, a connecting member 51 protruding downward is provided at both ends of the instrument holder 42, and a magnet 52 facing the magnet 50 is fixed to the connecting member 51. The magnets 50 and 52 have polarities set so as to attract each other. Therefore, when the drive screw 45 is rotated and the holder moving base 43 moves in the direction of arrow A as described above,
If both magnets 50, 52 are in a state of being attracted to each other, the instrument holder 42 is pulled by this holder moving base 43 and is indicated by the arrow A.
Move in the direction. On the other hand, when the holder moving base 43 is moved in the arrow B direction, the instrument holder 42 is pushed by the holder moving base 43 and similarly moves in the arrow B direction. A cam member 53 as a probe moving means is provided at the center of the holder moving table 43. The cam member 53 has a cam surface 53a that projects upward and is formed so that the device discharging portion 30C side is high and the potential difference measuring portion 30B side is low.

Next, the structure around the heating plate 36 will be described with reference to FIGS. It should be noted that FIGS. 5 and 6 respectively show sectional shapes of the portions along the lines VV and VI-VI shown in FIG. A pair of probe holder holding rods 6 are provided on the lower surface of the instrument mounting table 30 in the potential difference measuring unit 30B.
0,60 is fixed. These holding rods 60, 60 are arranged so as to sandwich the heating plate 36 therebetween, and a probe holder 61 is fitted on the holding rods 60, 60 so as to be vertically slidable. The probe holder 61 is received from below by washers 62, 62 attached to the lower ends of the holding rods 60, 60. A pair of heating plate holding rods 63, 63 are vertically slidably inserted in the probe holder 61, and the heating plate 36 is fixed to the upper ends of the holding rods 63, 63. A spring 64 is compressed around the holding rod 63 between the heating plate 36 and the probe holder 61.
Both are urged by 64 in a direction in which they are separated from each other.
The probe holder 61 thus biased is received by washers 65, 65 attached to the lower ends of the heating plate holding rods 63, 63. The lengths of the holding rods 60, 60 and 63, 63 are such that, with the lower surface of the probe holder 61 received by the washers 65, 65 and the washers 62, 62, the upper surface of the heating plate 36 of the instrument mounting table 30 is held. It is set to match the surface. Also, the lower ends of a pair of guide rods 66, 66 are fixed to the probe holder 61. These guide rods 66, 66 are arranged so as to sandwich the heating plate 36,
The upper end of them is a through hole 30d provided in the equipment mounting table 30.
It is possible to project from above. And the device mounting table
Guide rod between 30 and probe holder 61
A spring 67 is contracted around 66. Therefore, when the probe holder 61 is pushed upward from below, the probe holder 61 elastically moves upward together with the heating plate 36 along the rods 60, 60, and at this time the heating plate 36 is pressed from above. The probe holder 61 elastically moves relative to the heating plate 36.

Further, as an example, three pairs of potential difference measuring probes 68a, 68b, 69a, 69b, 70a, 70b are provided on the probe holder 61 so as to project upward. Each of the probes 68a, 68b, 69a, 69b and 70a, 70b can project upward through a notch or a through hole provided in the heating plate 36. That is, in the state where the heating plate 36 and the probe holder 61 are separated by the action of the spring 64 to the maximum extent (the state shown in FIG. 4), the tips of the probes 68a to 70b are located inside the heating plate 36. When the probe holder 61 moves relative to the heating plate 36 as described above, the tip projects upward from the surface of the heating plate 36. A roller 71 is attached to the lower part of the probe holder 61 at a position facing the cam member 53 of the holder moving table 43. Then, between the liquid spotting section 30A and the potentiometer side constant section 30B, the instrument mounting table is placed.
A through hole 72 is provided in the hole 30, and a bar code sensor 73 is attached to the lower side of the through hole 72.

When measuring the ion activity, the instrument holder 42 is in a state of being connected to the holder moving table 43 as described later, and the motor 46 is drive-controlled by a known position detection sensor or drive control circuit, The instrument holder 42 is arranged on the liquid spotting section 30A. As described above, in this state, the instrument holder 42 is located directly below the opening 12 of the cover 11, so that the slide 20 is inserted into the instrument holder 42 through the opening 12.
Set in the slide set hole 41 of.

This slide 20 is, for example, as described above, disclosed in Japanese Patent Laid-Open No.
Known items shown in No. 48, etc. or Japanese Patent Application No. 60-148564
(Japanese Patent Application Laid-Open No. 62-9264), Japanese Patent Application No. 60-180358 (Japanese Patent Application Laid-Open No. 62-39757), Japanese Utility Model Laid-Open No. 60-204699 (Japanese Utility Model Laid-Open No. 62-111655) However, it will be briefly described with reference to FIG. Slide 20 is 3
Seed ion-selective electrode pair 101 (consisting of ion-selective electrodes 111 and 112 electrically isolated from each other with a homogeneous ion-selective layer on the surface), 102 (also consisting of 112 and 122), 103 (also 113 and 123). A water-impermeable member layer 200 having an adhesive layer on both sides, a pair of porous liquid distribution members 310, 320 made of cotton and continuous void-containing nonwoven fabric made of regenerated cellulose fiber, and an upper frame body 400 made of plastic. It is housed between the lower frame 500 and the lower frame 500.

The upper frame 400 is provided with a pair of liquid supply holes 410, 420 and a recess 450 extending across the liquid supply holes, and a porous bridge 600 made of polyethylene terephthalate fiber spinning or the like is housed in the recess 450. , Fixed. Recess 4
The depth of 50 is set so that the bridge 600 does not protrude above the upper surface of the upper frame 400.

In the water impermeable member layer 200 disposed below the upper frame 400 with the ion selection electrode pairs 101, 102, 103 interposed, through holes (liquid descending passages) 210, 220 aligned with the liquid supply holes 410, 420, and the ion selection electrode 1
Through holes (liquid ascending passages) 211, 212, 213, 22 aligned with part of the ion selective layer regions of 11, 112, 113, 121, 122, 123, respectively.
1,222,223 are provided. Under the water impermeable member layer 200, a porous liquid distribution member 310 is arranged so as to be aligned with the through holes 210, 211, 212, 213, and a porous liquid distribution member 320 is arranged so as to be aligned with the through holes 220, 221, 222, 223. The lower frame 500 has recesses (liquid horizontal passages) 510 and 520 having a shape capable of accommodating the porous liquid distribution members 310 and 320. The upper frame 400, the water impermeable member layer 200, and the lower frame 500 each have a pair of through holes (air vent holes) 43.
0,440; 230, .240; 530,540 are provided to form an air vent hole that penetrates the entire slide 20. The ion-selective electrode pairs 101, 102, 103 are arranged with the ion-selective layer facing downward, and the terminal portions of these electrode pairs have a water-impermeable member layer 200.
The pair of notches 250, 260 provided in the lower frame body 500 and the pair of notches 550, 560 provided in the lower frame 500 are exposed to the lower surface of the slide.

In such a slide 20, for example, an ion selective electrode
Pair 101, 102, 103 with Cl , K , Na Ion selection for
Have layers and their ionic activities are known
The reference liquid is spotted on the liquid supply hole 410 so that the ion activity of these
If an unknown sample liquid is spotted on the liquid supply hole 420, the reference liquid
Permeates into the porous liquid distribution member 310 through the liquid descending passage 210.
Then, through the liquid rising passages 211, 212, 213, the ion selective electrode 1
Reach each of the 11,112,113 ion selective layers, while the sample solution
Penetration into the porous liquid distribution member 320 through the liquid descending passage 220
The ion selective electrode 12 passes through the liquid rising passages 221, 222, 223.
Reach 1,122,123 ion selective layers. Also, both liquids
A liquid junction occurs near the center of the bridge 600, resulting in electrical continuity.
It As a result, between the ion selective electrodes 111 and 121,
2 and 122, 113 and 123 respectively
Cl between sample solution , K , Na The difference in each ion activity of
Since a corresponding potential difference is generated, below the cutouts 550 and 560
Insert a potential measurement probe from the
Potential generated from each ion selective electrode pair by contacting the terminal
If the difference is measured, the
Each ion activity can be measured.

The slide 20 is set in the slide set hole 41 with the upper frame 400 facing upward. Then, the reference liquid and the sample liquid are spotted in the liquid spotting holes 410 and 420, respectively, by using, for example, a double pipette. When the start button 14 (see FIG. 1) is pressed after this spotting is completed, the motor 46 is driven and the holder moving base 43 is moved in the direction of the arrow A. Then, the holder holder 43 is pulled and the instrument holder 42 also moves to the potential difference measuring unit 30B side, and the stopper 9
The slide 20 that has been set in contact with the heating plate 36
Stop at a predetermined position facing. The motors 46 continue to be driven thereafter to further move the holder moving base 43 by a predetermined distance. At this time, since the instrument holder 42 cannot move, the magnets 50 and 52 are separated from each other, and the holder moving table 43 moves independently as described above. When the holder moving base 43 moves in this manner, the cam surface 53 of the cam member 53 is moved.
a comes into contact with the roller 71 of the probe holder 61, and the probe holder 61 is pushed upward as the holder moving base 43 moves. Then, the heating plate 36 is pushed up as described above, and the heating plate 36 is attached to the instrument holder.
The slide 20 held by 42 is pressed and fixed to the holding plate 37. At this time, as the probe holder 61 rises, the guide rods 66, 66 project onto the instrument mounting table 30, enter the guide holes 91, 91 of the instrument holder 42, and remove the instrument holder 42 (that is, the slide 20). Position it in place. When the slide 20 is pressed against the pressing plate 37 as described above,
After that, the heating plate 36 is prevented from rising, but the probe holder 61 is further pushed up for a predetermined length, which causes the heating plate 36 to rise.
Probes 68a, 68b, 69a, 69b and 70a, 70b project upward from the surface of 36. The thus-protruded probes 68a, 68b are inserted from below the notches 550, 560 of the slide 20 and contact the ion selective electrodes 111, 121, respectively. Similarly, the probes 69a and 69b are also inserted from below the notches 550 and 560 so that the ion selective electrodes are in contact with the electrodes 112 and 122, respectively.
The a and 70b are also inserted from below the cutouts 550 and 560 and contact the ion selective electrodes 113 and 123, respectively.

In this state, the motor 46 is stopped and then the heating plate 36
The slide 20 is heated to a predetermined temperature. After that time
After that, connect to the probes 69a-70b.
Ion selection by a known potential difference measurement circuit (not shown)
The potential difference between the electrode pairs 101, 102, 103 is measured respectively.
As mentioned earlier, by measuring these potential differences,
, Cl , K , Na Is measured. This way
The measured ion activity is displayed on the display unit 15.
Or recorded on the recording paper 17 in the recording unit 16.
(See FIG. 1). In addition, it was subjected to the potential difference measurement
The bar code on the slide 20 is detected by the bar code sensor 73.
Therefore, the above-mentioned ion activity can be identified on the slide 20.
Displayed or recorded with the code.

When the potential difference measurement described above is completed, the motor 46 is driven in the opposite direction to the case described above. As a result, the holder moving table 43 is moved in the arrow B direction. Then, the cam member 53 gradually separates from the roller 71 of the probe holder 61, and the probe holder 61 descends. Then each probe
69a to 70b are separated from the slide 20, guide rods 66 and 66 are pulled out downward from the guide holes 91 and 91 of the instrument holder 42, and then the heating plate 36 is also lowered to a position where its surface is aligned with the surface of the instrument mounting table 30. . The motor 46 is further driven as it is, and the holder moving base 43 continues to move, so that the connecting member 49 of the holder moving base 43 is connected via the magnets 50 and 52.
Then, the instrument holder 42 is also moved in the direction of arrow B. Therefore, the slide 20 on which the potential difference has been measured is moved from the potential difference measuring section 30B to the liquid spotting section 3 by the instrument holder 42.
It is sent to the 0A side. The motor 46 is driven until the instrument holder 42 is on the instrument discharge portion 30C. Instrument holder 42
When the slide 20 comes to the device discharging portion 30C, the slide 20 held by the device holder 42 is dropped into the slide discharging hole 38. The slide 20 is discharged from the discharge port 13 through the passage 39. Next, the motor 46 is rotated in the reverse direction and the instrument holder 42 is sent to the liquid spotting section 30A, where it is stopped to prepare for the next spotting.

Next, the simple check jig of the present invention will be described.

FIG. 8 is an exploded perspective view showing an exploded embodiment of the simple check jig of the present invention.

This simple check jig 1 includes an upper mount 2 and a lower mount 3 as a support, and three pairs of good electrical conductors 4
It is composed of A, 4B; 5A, 5B; 6A, 6B, a battery 7 and three resistance pairs 8a, 8b, 8c. The upper mount 2 and the lower mount 3 have substantially the same outer dimensions as the upper frame body 400 and the lower frame body 500 of the slide 20, and are made of, for example, plastic. However, the central portion of the upper mount 2 is hollowed out, and the battery 7 and the resistors 8a, 8b, 8c are arranged in the hollowed out portion. Battery 7, resistors 8a, 8
After wiring b and 8c, they are molded with plastic or the like poured from above in the figure. Further, the lower mount 3 is provided with six through holes 3a, 3b, 3c, 3d, 3e, 3f. These through holes 3a, 3b, 3c, 3d, 3e, 3f are respectively through holes 211, 212, 213, 22 of the water impermeable member layer 200 of the slide 20.
It is provided at a position corresponding to 1,222,223. The mounts 2 and 3 may be the upper frame 400 with the center cut out, or the lower frame 500 itself. Further, as the good metal conductors 4A, 4B; 5A, 5B; 6A, 6B, a stainless steel plate which is resistant to rust and has high durability, a copper alloy surface plated with tin or gold, and the like are used.

FIG. 9 shows the battery 7 shown in FIG. 8 and three resistors 8a, 8b,
It is a circuit diagram showing wiring of 8c.

Both ends of the battery 7 have resistors 8a, 8b connected in series with each other.
(+ Side is connected by resistor 8a). Also, one end of a resistor 8c is connected to the connection point of these resistors 8a, 8b, and the other end of the resistor 8c is a pair of good electrical conductors 4A, 4B; 5A, 5
B; connected to 4A, 5A, 6A on one side of 6A, 6B. The other good electrical conductors 4B, 5B, 6B are held at the ground potential.

Figure 10 shows the sodium ion activity in the solution (horizontal axis),
9 is a graph showing the relationship between the potential (vertical axis) generated between both electrodes of the slide 20 when the solution and the reference solution are spotted on the slide 20 (see FIG. 7).

As shown in this figure, the potential difference linearly increases as the ion activity concentration increases. A negative potential is output on the low concentration side where the ion activity is low.

As the simple check jig 1 shown in FIG. 8, three types are prepared for high concentration, medium concentration, and low concentration depending on the large, medium, and small ion activity.

As the battery 7 of the simple check jig 1 (see FIG. 8), for example, one having an output of 3V is used. The resistance values R ₁ , R ₂ , and R ₃ of the resistors 8a, 8b, and 8c of the high-concentration simple check jig 1 are, for example, R ₁ = 10MΩ, R ₂ = 20K.
Ω, R ₃ = 10 MΩ is used. For medium concentration, for example, R ₁ = 10 MΩ, R ₂ = 1 KΩ and R ₃ = 10 MΩ are used. For low concentration, for example, R ₁ = 10
MΩ, R ₂ = 40 KΩ, and R ₃ = 10 MΩ are used, and the polarity of the battery 7 is reversed from the circuit diagram shown in FIG. 9 so that the load potential is output. The resistors 8a and 8b are used to generate an appropriate potential difference from the battery 7 (3V), and the resistor 8c is used to adjust the output impedance. Further, in the above configuration, the battery 7 to the resistor
A current will always flow through 8a and 8b, but if a resistor having the above-mentioned resistance value is used, it can be sufficiently used for about two years. Further, it goes without saying that a switch may be provided so as not to pass current when not in use.

When the analyzer 10 is inspected, the simple check jig 1 having the above-mentioned configuration replaces the slide 20 and has the slide set hole described above.
Set to 41. In this case, since the mounts 2 and 3 have the outer dimensions as described above, the simple check jig 1 is tightly housed in the slide set hole 41. At this time, the simple check jig 1 is set with the upper mount 2 facing upward. Next, as in the case of measuring the ion activity, the start button 14 is pressed to move the holder moving base 43 and raise the probe holder 61. This causes the probes 68a, 68b, 69a, 69b, and 70a, 70b to project upward,
The probes 68a and 68b pass through the through holes 3a and 3d of the mount 3,
Similarly, the probes 69a and 69b pass through the through holes 3b and 3e, and the probes 70a and 70b pass through the through holes 3c and 3f and contact the good electric conductors 4A, 4B; 5A, 5B; 6A and 6B, respectively. Therefore probe 68a
And 68b, the probes 69a and 69b, and the probes 70a and 70b, a voltage similar to that at the time of measuring the ion activity is applied.

If all the electric circuits of the analyzer 10 are in normal condition, when voltage is applied between the probes as described above,
This value is displayed on the display unit 15 (see FIG. 1). By this display, the subject can inspect whether there is a contact failure, disconnection, etc., and whether or not the ion activity is accurately measured and displayed by the analyzer 10. Further, as described above, by preparing a plurality of simple check jigs corresponding to the high concentration, the medium concentration, and the low concentration of the ion activity and performing the inspection as described above, the inspection can be performed more accurately. Done,
Also, the linearity of the measurement system can be confirmed.

The simple check jig after the inspection is ejected in the same manner as the slide 20 at the time of the potential difference measurement described above. In the above embodiment, the slide 20 is automatically sent to the potential difference measuring unit,
Further, the analyzer 10 formed so as to be discharged from the potential difference measuring unit was described as an example, but the simple check jig of the present invention is not limited to this type of analyzer, and the slide 20
Can also be used in an analyzer configured to manually send and discharge the potential difference measuring unit.

(Effect of the invention) As described in detail above, the simple check jig of the present invention is
Instead of slides, it is placed at the designated position on the analyzer,
When the probe of the analyzer is brought into contact with the probe, a potential difference similar to that when measuring the ion activity is generated between the probes, so it is very easy to make a contact failure in the measurement system of the analyzer, disconnection, etc., and accurate measurement output of the analyzer. The inspection work by analyzer manufacturers, service personnel, and users will be easier and more efficient than ever before.

In addition to the potential difference, the output impedance can be simulated more accurately by constructing a simple check jig that has almost the same output impedance as that of the ion activity measuring instrument. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an analyzer to which the simple check jig of the present invention is applied, and FIGS. 2, 3 and 4 are perspective views, plan views and side cross-sectional views showing main parts of the analyzer, respectively. 5 is a side sectional view of a portion taken along the line VV of FIG. 3, FIG. 6 is a side sectional view of a portion taken along the line VI-VI of FIG. 3, and FIG. FIG. 8 is an exploded perspective view showing an example of a slide-type ion activity measuring instrument used, FIG. 8 is an exploded perspective view showing an example of a simple check jig of the present invention, and FIG. 9 is shown in FIG. FIG. 10 is a circuit diagram showing the wiring of the battery and the resistor, and FIG. 10 is a graph showing an example of the relationship between the ionic activity of the solution and the potential difference generated between the electrodes of the slide. 1 …… Simple check jig 2 …… Upper mount 3 …… Lower mount 4A, 4B, 5A, 5B, 6A, 6B …… Electrical conductor 7 …… Battery 8a, 8b, 8c …… Resistor 10 …… Analyzer 20 …… Slide type ion activity measuring instrument 68a, 68b, 69a, 69b, 70a, 70b …… Potential measuring probe

Claims (2)

[Claims] 1. At least one pair of ion-selective electrodes that generate an electric potential corresponding to the ion activity of a specific ion, and a porous bridge arranged so as to connect between both electrodes of the pair of ion-selective electrodes. By using an ion activity measuring instrument having, by measuring the potential difference between the electrodes by contacting each electrode of the ion selective electrode pair of the ion activity measuring instrument placed at a predetermined position with a potential difference measuring probe A simple check jig for inspecting the function of an analyzer for measuring ion activity, comprising a support having an outer dimension that can be placed at the predetermined position instead of the ion activity measuring instrument, and attached to this support. , A pair of good electrical conductors arranged at the position where the probe comes into contact, and the porous bridge attached to this support and penetrated by the sample solution and the reference solution. The Fast Check jig ionic activity measuring analyzer comprising a substantially equal potential and potential difference generated between the electrodes and a power supply that induces between the electrical conductor forming the pair when the conduction. 2. At least one pair of ion-selective electrodes for generating an electric potential corresponding to the ion activity of a specific ion, and a porous bridge arranged so as to connect between both electrodes of the pair of ion-selective electrodes. By using an ion activity measuring instrument having, by measuring the potential difference between the electrodes by contacting each electrode of the ion selective electrode pair of the ion activity measuring instrument placed at a predetermined position with a potential difference measuring probe A simple check jig for inspecting the function of an analyzer for measuring ion activity, comprising a support having an outer dimension that can be placed at the predetermined position instead of the ion activity measuring instrument, and attached to this support. , A pair of good electrical conductors arranged at the position where the probe comes into contact, and the porous bridge attached to this support and penetrated by the sample solution and the reference solution. Approximately equal potential and the output impedance comprising a power supply that induces between the electrical conductor forming the counter ion activity Fast Check jig measurement analyzer the potential difference and the output impedance generated between the electrodes when a conductive.