公开(公告)号：JPH01291152A

公开(公告)日：1989-11-22

申请号：JP12032488

申请日：1988-05-17

Applicant: TOA ELECTRONICS ,  TOKO TESUTATSUKU KK

Inventor： SUGIMOTO KATSUHISA ,  TAGUCHI TOYOKI ,  MINAMIMOTO ITARU

IPC: G01N27/22

Abstract: PURPOSE:To continuously measure the pH of a high-temp. aq. soln. by impressing current of a specified voltage to a counter electrode and passing specified AC between a reference electrode and a working electrode consisting of an oxide semiconductor. CONSTITUTION:This instrument has the counter electrode 1 connected to a DC power supply of the specified voltage, the reference electrode 2 and the working electrode 3 consisting of the oxide semiconductor. An amplitude control type sine wave generator 8 is provided between the reference electrode 2 connected between the counter electrode 1 and the working electrode 3 and the working electrode 3. Further, the instrument has a phase detector 10 which detects the space charge capacity of the electrode 3 connected between the electrode 2 and the electrode 3 and a data processing part 11 which determines pH by arithmetic processing of the space charge capacity. The specified AC is passed between the electrode 2 and the electrode 3 by impressing DC of the specified voltage to the counter electrode 1 and the space charge capacity of the electrode 3 changing in accordance with the pH of test water 5 is detected by the detector 10. The pH of the test water 5 is determined by the proportional calculation of the detected space charge capacity and the space charge capacity at known pH.

公开(公告)号：JPS63265163A

公开(公告)日：1988-11-01

申请号：JP10068787

申请日：1987-04-23

Applicant: TOA ELECTRONICS ,  NIPPON KAYAKU KK

Inventor： ISHII MASARU ,  KIYONO YUKO ,  GOTSU TOSHIO ,  AIKAWA KATSUAKI

IPC: G01N33/543 ,  C12M1/34 ,  G01N27/416

Abstract: PURPOSE:To measure enzyme activity, by adding a substrate, which undergoes oxidation reduction reaction with oxygen, in a solution including prepared immunity enzyme composite, and detecting the oxidation reduction potential of the solution. CONSTITUTION:An immunity enzyme composite such as solidified antibody/antigen/enzyme marker antibody is formed by immunization reaction, and the enzyme reaction of the enzyme in the immunity enzyme composite and the substrate is made to occur. Then, a solution after the enzyme reaction is stopped is picked up and put in a measuring bath 1. With the solution being stirred with an agitator 2, a working electrode 3 and a reference electrode 4 are immersed in the solution and an oxidation reduction potential is detected. The potential difference detected with both electrodes 3 and 4 is displayed on a display part 7 as a voltage value through an amplifier 5 and a signal processing part 6. The obtained voltage value is the value corresponding to the concentration ratio between the reduced body and the oxidized body in the solution. The voltage value is obtained for a standard liquid with known concentration beforehand, and a calibration curve for relation between the concentration and the voltage value is prepared. Thus the concentration of the component is obtained from the voltage value which is obtained for a sample, according to the calibrating curve.

公开(公告)号：JPS63243743A

公开(公告)日：1988-10-11

申请号：JP7826187

申请日：1987-03-31

Applicant: NIPPON ATOMIC IND GROUP CO ,  TOSHIBA CORP ,  TOA ELECTRONICS

Inventor： ICHIKAWA NAGAYOSHI ,  SAITO YOSHIHISA ,  HENMI YUKIO ,  DAITO YOSHIAKI ,  KUBO KOJI ,  TAGUCHI TOMIO ,  HORIGOME TOSHIHIRO

IPC: G01R27/22 ,  G01N27/06 ,  G01N27/07 ,  G21C17/02

Abstract: PURPOSE:To hold a cell constant to a constant value regardless of the temp. of a specimen solution and to make measuring work accurate, by concentrically arranging an inside electrode layer and an outside electrode layer in a pressure resistant container at a predetermined interval. CONSTITUTION:An inner electrode 15 and an outer electrode 16 are arranged concentrically in a pressure resistant container 10 at a predetermined interval, and an inside electrode layer 17 and an outside electrode layer 18 are formed to the outer surface of the inner electrode 15 and the inner surface of the outer electrode 16 respectively both of which are opposed to each other. The high temp. and high pressure specimen solution such as primary cooling water introduced into the pressure resistant container from an inflow port 12 flows through the gap between the inside electrode layer 17 and the outside electrode layer 18 and, during this time, the electric resistance between the electrodes is measured. In this case, since the inside and outside electrode layers 17, 18 are formed on the inner surface of the inner electrode and the outer surface of the outer electrode opposed to each other, the relative change ratio of the interval between the electrode layers by thermal expansion is low and a cell constant becomes the value almost equal to the cell constant at the time of inspection at ambient temp. and the conductivity of the specimen solution can be measured safely and accurately.

公开(公告)号：JPS63163258A

公开(公告)日：1988-07-06

申请号：JP31295786

申请日：1986-12-26

Applicant: TOA ELECTRONICS

Inventor： KUSHISHITAMACHI RYUSUKE ,  AKASAKA KINICHI

IPC: G01N21/49 ,  G01N21/15

Abstract: PURPOSE:To eliminate the influence of an air bubble which enters sample liquid inevitably and to take a measurement stably at all times by blowing air to a light-irradiated area on the surface of the sample liquid through the opening of a flow cell. CONSTITUTION:A light confinement path 6 is formed in the flow cell 1 by extending an internal wall part corresponding to the path of light externally and cylindrically. An air blowing nozzle 9 of about 2mm in diameter is fitted at height of about 5cm from the liquid surface of the sample water 3 above the flow cell 1 and on the opposite side from a light emitting device 7. Further, the angle theta between the air blowing nozzle 9 and sample water 3 is set to about 35 deg.. Further, an air pump 10 is connected to the air blowing nozzle 9 and an air pressure governor choke 11 is provided between the both. Then when a measurement is taken, air is blown to the liquid surface part of the sample water 3 where light is projected from the nozzle 9, so even if there is an air bubble in the sample water, it is moved to a peripheral side and never reaches the light irradiated area. Therefore, there is no scatter by an air bubble and the measurement is performed stably at all times.

公开(公告)号：JPS63132170A

公开(公告)日：1988-06-04

申请号：JP27649486

申请日：1986-11-21

Applicant: TOA ELECTRONICS

Inventor： SUZUKI HIROSHI ,  TAKAYAMA HISASHI ,  SUZUKI HIROYUKI ,  YOKOYAMA ICHIRO

IPC: G01N1/00 ,  G01N35/10

Abstract: PURPOSE:To entirely remove the sample liquid remaining in a sample transport pipeline so that the trace sample is analyzed with high accuracy by feeding air as air bubbles at >=1 points into said pipeline from an air transport pipe to execute co-cleaning, then drawing part of the feed side sample into the air transport pipe side after the final air bubble is fed into the pipeline. CONSTITUTION:The sample liquid entering the pipeline 2 from a sample pot 1 is sucked by a pump 4 and is introduced into a flow cell 3 for measurement from which the sample liquid is discharged through a discharge port 5. A part of a standard liquid is passed to the pipeline 2 and the cell 3 to co-clean the same prior to the measurement or at the time of calibration. A small amt. of the air is intermittently fed into the pipeline 2 from a branch pipe 6 through a released pinch valve 8 and is introduced as the air bubbles into the flow of the sample in the pipeline 2 from >=1 points to remove the remaining previous measuring liquid, etc. The sample liquid or the standard liquid for calibration is fed from the sample pot 1 into the pipeline 2 and the feed of the air is stopped right after the final air bubble is fed into said pipeline upon ending of the co-cleaning.

公开(公告)号：JPS6373144A

公开(公告)日：1988-04-02

申请号：JP21836486

申请日：1986-09-17

Applicant: TOA ELECTRONICS ,  KIKKOMAN CORP

Inventor： MURAYAMA JIRO ,  KAKEFUDA YOSHIHIKO ,  SUZUKI KAZUO ,  KOBAYASHI KUNIO ,  YAMANAKA SETSUO ,  HASHIMOTO HIKOTAKA

IPC: G01N1/00 ,  G01N27/42

Abstract: PURPOSE:To maintain electrolyte in a measuring cell at a constant quantity all the time, by automatically injecting sample liquid in the measuring cell, and automatically discharging the electrolyte corresponding to the quantity of the injected sample liquid out of the measuring cell at the same time to the outside of this system. CONSTITUTION:A through holes 17' at one side of rotated disc 20 is filed with sample liquid. The sample liquid is dilluted with electrolyte 1, which is circulated in a liquid sending path 5 by a circulating pump 22, and injected into a measuring cell 2 through the liquid sending path 5. At the same time, the electrolyte 1, which is put in another through hole 17 of the rotated disc 20, is discharged to the outside of this system through a liquid discharge path 6 naturally or by a liquid discharging pump. The through holes 17 and 17' of the rotated disc 20 have the same volume. The electrolyte 1 which has the quantity corresponding to the quantity of the sample 3 injected in the cell 3 is discharged to the outside of this system. Therefore, the quantity of the electrolyte 1 in the cell 3 can be kept at the constant quantity all the time even if continuous measurement is repeated.

公开(公告)号：JPS6355435A

公开(公告)日：1988-03-09

申请号：JP19895086

申请日：1986-08-27

Applicant: TOA ELECTRONICS

Inventor： MORIMURA TADAMI ,  IMAI EIJI

IPC: G01N1/10

Abstract: PURPOSE:To efficiently and completely filtrate and eliminate impurities such as an unnecessary suspension, etc., and to discharge them to the outside of a system by connecting a network tube having a mesh diameter which can filtrate and separate the suspension, etc., contained in a liquid, into a feed liquid pipe-line for feeding by pressure a sample liquid to an analyzing device, etc. CONSTITUTION:A network tube 4 is a flexible and elastic tube made of a fibrous matter or a sponge, etc., having fine holes of a mesh diameter which cannot allow a suspension contained in the sample liquid, or a minute solid mater to transmit through, and provides so as to be pressed in a U-shape against the plural pieces of press rollers 7 provided between two pieces of disks 5 attached to a shaft 6. In such a way, when the disks are rotated in a direction as indicated with an arrow, the tube 4 is pressed by the rollers 7, and the sample liquid transmitted through its thin hole part oozes out of the surface of the roller 7 and drops down, collected to a sample liquid container 12 by a receiver 11, and fed to an analyzing device, etc., from a tube pipe-line 13 connected to said container. On the other hand, an unnecessary suspension, etc., left in the tube 4 are fed by pressure to an outlet tube 9 together with the remaining liquid,, and discharged to the outside of a system therefrom.

公开(公告)号：JPS6222053A

公开(公告)日：1987-01-30

申请号：JP16246585

申请日：1985-07-23

Applicant: TOA ELECTRONICS

Inventor： IZU TOSHIO ,  SUZUKI HIROSHI ,  SAKURAI HISASHI ,  TAKAYAMA HISASHI ,  SUZUKI HIROYUKI

IPC: G01N33/483 ,  G01N13/04 ,  G01N25/04 ,  G01N25/14

Abstract: PURPOSE:To exactly measure an osmotic pressure by vertically and relatively moving a sublimation nucleus and sample liquid surface to bring both into contact with each other and to freeze the sample liquid, measuring the freezing point and determining the osmotic pressure of the sample liquid in accordance with the freezing point depression degree. CONSTITUTION:The substantial sublimation nucleus is formed to the top end of a metallic rod 5 and after the sample liquid in a measuring cell 2 attains a supercooling stage, a valve 18 is opened and a pump 12 is operated to raise the sample liquid surface in the cell 2 up to the height at which said liquid surface surely contacts with the sublimation nucleuous. The sample liquid instantaneously freezes when the ice crystal angle contacts with the sample liquid in the supercooled state. The temp. of the sample liquid is increased from the supercooling temp. by the latent released at the same instant and attains the equil. temp., i.e., freezing point temp. for several seconds in the co-existence state of the ice and water; therefore the freezing point depression degree is determined by detecting such temp. The osmotic pressure is calculated by an arithmetic unit from the freezing point depression degree.

公开(公告)号：JPS6035274A

公开(公告)日：1985-02-23

申请号：JP14410583

申请日：1983-08-05

Applicant: TOA ELECTRONICS

Inventor： SHIMADA KOUICHI ,  ISHIKAWA KIYOU ,  EMORI KEIZOU ,  SATOU TOMOAKI

IPC: G01R19/15

Abstract: PURPOSE:To enables the measurement of fine current using a relatively long cable by connecting a detection resistor between the inversion input terminal and the output terminal of a differential amplifier, one end of an object to be measured to the inversion input terminal and the other end of the object to the output terminal through the power source. CONSTITUTION:A differential amplifier 17 with a high gain and non-saturable is used. The non-inversion input terminal is grounded and a detection resistor 13 is connected between the inversion input terminal and the output terminal thereof. One end of an object 11 to be measured is connected to the inversion input terminal while the other end of the object 11 is connected to the output terminal through the power source 12. With such an arrangement, with the feedback action through the detection resistor 13, the inversion input terminal has almost the ground potential. The current I1 flowing through the object 11 to be measured runs to the detection resistor 13 and the product RsI1 of the current I1 and the resistance value Rs of the detection resistor 13 is measured with a voltometer 18 to determine the current I1.

公开(公告)号：JPS607218A

公开(公告)日：1985-01-16

申请号：JP11448983

申请日：1983-06-24

Applicant: TOA ELECTRONICS

Inventor： AMAMOTO HIDEKI

IPC: H03H11/12

Abstract: PURPOSE:To keep the circuit sensitivity Q to a constant value even if the gain is changed by activating an operational amplifier as a non-inverting amplifier and feeding back its inverting input signal to a CR circuit network via a buffer amplifier of unity gain conducting impedance conversion. CONSTITUTION:An input terminal 11 is connected to a non-inverting input of the operational amplifier 19 through a CR circuit network 12, an output of the operational amplifier 19 is connected to an output terminal 14 and also grounded through a voltage dividing element 25, and the output of the voltage dividing element 25, i.e., a connecting point of resistors 23, 24 is connected to an inverting input of the operational amplifier 19 as feedback. Then, the output of the voltage dividing point is connected to the CR circuit network 12 through a buffer amplifier 26 of the unity gain to be connected to the non-inverting input of the operational amplifier 19 as positive feedback. Since no signal appears between the inverting input and the non-inverting input of the operational amplifier 19, a signal having the same amplitude of the signal voltage between the non-inverting input and ground is generated between the inverting input and ground. That is, the circuit sensitivity Q is kept constant even if the gain is changed.