GB2233768A - Ion selective sensor with failure indication - Google Patents
Ion selective sensor with failure indication Download PDFInfo
- Publication number
- GB2233768A GB2233768A GB9015209A GB9015209A GB2233768A GB 2233768 A GB2233768 A GB 2233768A GB 9015209 A GB9015209 A GB 9015209A GB 9015209 A GB9015209 A GB 9015209A GB 2233768 A GB2233768 A GB 2233768A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- output
- ion selective
- sensor
- range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
- G01N27/4165—Systems checking the operation of, or calibrating, the measuring apparatus for pH meters
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Immunology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Emergency Alarm Devices (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
Failure of an ion selective sensor is indicated when the sensor output falls outside a predetermined range. A pH sensor is described. It comprises a pH selective glass bulb 18 with silver/silver chloride electrode 24 in potassium acid phthalate reference electrolyte 20, and a reference electrode of silver/silver chloride 36 in standard reference electrolyte 32 connected to the sensing volume 50 by liquid junction 30. Amplifier 44, connected to the sensor output is programmed to give a normal output for pH range 6.5-8.2. If a zero voltage output occurs, corresponding to a pH of 5.5 and probable rupture of tube 16, signal circuit 46 produces an output. <IMAGE>
Description
SAFE FAILURE ION SELECTIVE COMBINATION ELECTRODES This invention relates
to ion selective combination electrodes, and more particularly to such devices which can detect and signal their own breakdown.
General purpose pH combination electrodes that operate over the full pH range and provide an output of about minus 60 millivolts (mV) per unit of pH, output at pH 7.0 being zero mV are known. It is known also to shift the zero mV point, as to pH 4. 0 or 10. 0, to avoid automatic temperature compensating metering circuits, by varying internal solution formulation.
We have now discovered that an ion selective combination electrode in which a predetermined output (preferably zel.70 voltage) corresponds to ion concentrations, s,,.i(,,h as pH, outside a desired range makes it possible to detect an electrode's internal breakdown.
The present invention provides an ion selective combination elec.trode comprising: an ion selective electrode, said electrode including a container, a liquid in said container, and an ion sensitive element in said liquid; a referenc.e electrode; and a control unit, said unit being constructed to provide a signal if the output from the electrOCIE.'3 is outside a predetermined range.
In preferred embodiments, sensitivity is to pH. Also in preferred embodiments, the output from the electrodes giving rise to the signal from the control unit is zero voltage.
The in-,,cjltion is hereinafter described by way of example only, wit:h ref6rence to the single figure of drawings, which is a diagrammatic representation of an embodiment of elec-crode according to the invention.
Ion selective combination electrode 10 has as two functional parts an ion selective electrode indicated generally at 12 and a reference electrode indicated generally at 14.
Ion selc-ictive electrode 12 has a glass stem 16 in - 2 communication with ion selective glass bulb 18. Within the vessel defined by stem 16 and bulb 18 is solution 20, in which hang silver wire 22 with dependent therefrom. silver chloride billet 24. Inner solution 20 is a pH 5.0 solution prepared by adding Potassium Acide Phthalate (Merck, AR Primary StandARd), 0.05 mols phthalate, to 1.8 mols of potassium chloride, the whole made up to a one liter quantity with deionized water, and adjusted to its final p11 with NaOH. Seal 26 provides a seal around tubular portion 16 and wire 22.
Bushing 28, which has liquid junction 30 extending therethrough, is an annulus which positions electrode 12 within electrode 14. The latter contains, above bushing 28, a standard prior art reference electrolyte solution 32. Silver wire 34 extends into solution 32, and has dependent from it silver chloride billet 36. Seal 38, which is annular, seals wire 34 and both electrodes therearound.
Container 40 is shown with, within it, a solution 42 the p11 of which is being monitored.
Wires 22 and 34 are connected with amplifier 44, which provides a voltage output reflecting the input from the two wires. The unit indicated diagrammatically and generally at 46 has control and alarm circuits and provides a warning signal if voltage goes to zero; the unit 46 is programmed so that predetermined desired voltages are in the pH range of 6.5 to 8.2, while zero voltage is at pH 5.5. Outer wall 48 provides both the wall for reference electrode 14 and a zone 50. whereat solution being tested can be in contact with bulb 18 and junction 30, for sealed electrical contact therethrough (through holes not shown). 30 The f01101,7ing chart compares the preferred embodiment and prior art above referred to:
pH of a solution 4.0 5.0 being tested Preferred Example safety range Preferred Example << low pH alarm range Preferred Example high pH alarm range Prior Art electrode MV output
Prior Art electrode failure point
Preferred Example electrode mV output Preferred Example electrode failure point Operation 120 30 0 -30 X 1 (p11 5.5) 1 6.0 7.0 (6.5) 0 1 X (pH 7. 0) 8.0 9.0 -60: -120 In normal use, with the combination electrode 10 in the test liquid 42, 1)11 is within the safe range set into unit 46, and is therein monitored. If tube 16. -- ruptures, voltage goes to zero, which in the invention is outside the safe or predetermined operating range, and a signal circuit in unit 46 gives its signal. The signal is also given at other voltages outside the predeterminedly desired range.
Claims (4)
1. An ion selective combination electrode comprising: an ion selective electrode, said electrode including a container, a liquid in said container, and an ion sensitive element in said liquid; a reference electrode; and a control unit, said unit being constructed to provide a signal if the output from the electrodes is outside a predetermined range.
2. The combination electrode of claim 1 in which sensitivity is to pH.
3. The combination of Claim 1 or Claim 2 in which said output is zero voltage, and zero voltage is outside said range.
4. An ion selective combination electrode substantially as hereinbefore described, with reference to and as shown in the drawings.
Published I 9c al Tht S!.,- 1P 4TI'. Funher (upi- 13( o131dizj(,ci from Th, Patt.w Onit Ild S! Crn K, n: C,,'
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37788789A | 1989-07-10 | 1989-07-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9015209D0 GB9015209D0 (en) | 1990-08-29 |
GB2233768A true GB2233768A (en) | 1991-01-16 |
GB2233768B GB2233768B (en) | 1994-01-05 |
Family
ID=23490917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9015209A Expired - Fee Related GB2233768B (en) | 1989-07-10 | 1990-07-10 | Safe failure ion selective combination electrodes |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPH0346554A (en) |
CA (1) | CA2019728C (en) |
DE (1) | DE4021853C2 (en) |
FR (1) | FR2649486A1 (en) |
GB (1) | GB2233768B (en) |
IT (1) | IT1240484B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6148196B2 (en) | 2014-03-31 | 2017-06-14 | 株式会社クボタ | Working machine hydraulic system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1337544A (en) * | 1969-12-19 | 1973-11-14 | Ple Sey Co Ltd | Fluid testing apparatus |
GB1368823A (en) * | 1972-05-10 | 1974-10-02 | Activion Glass Ltd | Ion-responsive electrodes |
US4039933A (en) * | 1976-03-25 | 1977-08-02 | Instrumentation Laboratory, Inc. | Continuous calibration system and method for analytical instruments |
GB1568644A (en) * | 1976-03-17 | 1980-06-04 | Owens Illinois Inc | Combination electrode assemblies |
US4774956A (en) * | 1985-05-02 | 1988-10-04 | Mic Medical Instrument Corporation | Portable apparatus for the determination of upper gastrointestinal function in terms of pH values and clinical uses thereof |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4331198Y1 (en) * | 1965-03-04 | 1968-12-18 | ||
JPS4838890B1 (en) * | 1968-12-16 | 1973-11-20 | ||
US3661748A (en) * | 1970-04-07 | 1972-05-09 | Instrumentation Labor Inc | Fault sensing instrumentation |
US4189367A (en) * | 1978-10-19 | 1980-02-19 | Leeds & Northrup Company | Method for testing ion selective electrodes in continuous measuring systems |
JPS58178410A (en) * | 1982-04-14 | 1983-10-19 | Fuji Electric Co Ltd | Warning circuit |
US4822456A (en) * | 1987-06-05 | 1989-04-18 | Bryan Avron I | Ion measuring apparatus and monitoring system |
US4900422A (en) * | 1988-07-05 | 1990-02-13 | Bryan Avron I | System for monitoring and reporting the operability and calibration status of a dissolved oxygen sensor |
-
1990
- 1990-06-25 CA CA002019728A patent/CA2019728C/en not_active Expired - Fee Related
- 1990-06-28 JP JP2171284A patent/JPH0346554A/en active Pending
- 1990-07-09 IT IT67507A patent/IT1240484B/en active IP Right Grant
- 1990-07-09 DE DE4021853A patent/DE4021853C2/en not_active Expired - Fee Related
- 1990-07-10 GB GB9015209A patent/GB2233768B/en not_active Expired - Fee Related
- 1990-07-10 FR FR9008768A patent/FR2649486A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1337544A (en) * | 1969-12-19 | 1973-11-14 | Ple Sey Co Ltd | Fluid testing apparatus |
GB1368823A (en) * | 1972-05-10 | 1974-10-02 | Activion Glass Ltd | Ion-responsive electrodes |
GB1568644A (en) * | 1976-03-17 | 1980-06-04 | Owens Illinois Inc | Combination electrode assemblies |
US4039933A (en) * | 1976-03-25 | 1977-08-02 | Instrumentation Laboratory, Inc. | Continuous calibration system and method for analytical instruments |
US4774956A (en) * | 1985-05-02 | 1988-10-04 | Mic Medical Instrument Corporation | Portable apparatus for the determination of upper gastrointestinal function in terms of pH values and clinical uses thereof |
Also Published As
Publication number | Publication date |
---|---|
IT1240484B (en) | 1993-12-17 |
IT9067507A0 (en) | 1990-07-09 |
JPH0346554A (en) | 1991-02-27 |
IT9067507A1 (en) | 1992-01-09 |
CA2019728A1 (en) | 1991-01-10 |
GB2233768B (en) | 1994-01-05 |
GB9015209D0 (en) | 1990-08-29 |
FR2649486A1 (en) | 1991-01-11 |
DE4021853A1 (en) | 1991-01-24 |
CA2019728C (en) | 1995-01-17 |
DE4021853C2 (en) | 1995-03-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960710 |