GB1203049A - A circuit for an electronic ph meter - Google Patents

A circuit for an electronic ph meter

Info

Publication number
GB1203049A
GB1203049A GB5542667A GB5542667A GB1203049A GB 1203049 A GB1203049 A GB 1203049A GB 5542667 A GB5542667 A GB 5542667A GB 5542667 A GB5542667 A GB 5542667A GB 1203049 A GB1203049 A GB 1203049A
Authority
GB
United Kingdom
Prior art keywords
transistor
electrodes
differential
voltmeter
circuit
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.)
Expired - Lifetime
Application number
GB5542667A
Inventor
Albert James Rand
Paul Gardiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALBERT MEASUREMENTS Ltd
Original Assignee
ALBERT MEASUREMENTS Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ALBERT MEASUREMENTS Ltd filed Critical ALBERT MEASUREMENTS Ltd
Priority to GB5542667A priority Critical patent/GB1203049A/en
Publication of GB1203049A publication Critical patent/GB1203049A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G01N27/4166—Systems measuring a particular property of an electrolyte
    • G01N27/4167—Systems measuring a particular property of an electrolyte pH

Abstract

1,203,049. Electro-chemical analysis; voltage measurement. ALBERT MEASUREMENTS Ltd. Nov.27, 1968 [Dec.6, 1967], No.55426/67. Headings G1N and G1U. A high input impedance, differential, transistor voltmeter is used with e.g. glass electrodes for pH measurement. The DIFFERENTIAL TRANSISTOR VOLTMETER comprises an F.E.T., Q1, with a high-gain, emitter follower Q2; microammeter M1, and a mirrorimage-circuit including F. E. T., Q4 and transistor Q 4 . OVER-VOLTAGE & TRANSIENT PROTECTION is provided by a filter circuit R9, C1, together with neon N1. Also the input may be shortcircuited by switch S1 to protect against surge voltages when changing the electrodes from one sample to another. pH CALIBRATION. With the electrodes in a standard solution of known pH, R4 is adjusted to obtain a required deflection on M<SP>1</SP> corresponding to the pH. Sample temperature compensation may be introduced manually by R7 or R7 may be replaced by a platinum resistance thermometer.
GB5542667A 1967-12-06 1967-12-06 A circuit for an electronic ph meter Expired - Lifetime GB1203049A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5542667A GB1203049A (en) 1967-12-06 1967-12-06 A circuit for an electronic ph meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5542667A GB1203049A (en) 1967-12-06 1967-12-06 A circuit for an electronic ph meter

Publications (1)

Publication Number Publication Date
GB1203049A true GB1203049A (en) 1970-08-26

Family

ID=10473871

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5542667A Expired - Lifetime GB1203049A (en) 1967-12-06 1967-12-06 A circuit for an electronic ph meter

Country Status (1)

Country Link
GB (1) GB1203049A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2230328A1 (en) * 1971-10-26 1974-12-20 Derr Lloyd
EP1980848A1 (en) * 2007-04-12 2008-10-15 Mocon, Inc. Electrochemical sensor with short-circuiting switch and method of zero-calibration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2230328A1 (en) * 1971-10-26 1974-12-20 Derr Lloyd
EP1980848A1 (en) * 2007-04-12 2008-10-15 Mocon, Inc. Electrochemical sensor with short-circuiting switch and method of zero-calibration
US9128045B2 (en) 2007-04-12 2015-09-08 Mocon, Inc. Electrochemical sensor with zero calibration feature and method of calibrating

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees