US3832675A - Electrode comprising a head and a detachable plug - Google Patents
Electrode comprising a head and a detachable plug Download PDFInfo
- Publication number
- US3832675A US3832675A US00296968A US29696872A US3832675A US 3832675 A US3832675 A US 3832675A US 00296968 A US00296968 A US 00296968A US 29696872 A US29696872 A US 29696872A US 3832675 A US3832675 A US 3832675A
- Authority
- US
- United States
- Prior art keywords
- electrode head
- contact
- electrode
- casing
- cable plug
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
Definitions
- connection is a good electrical connection of a first contact and a second contact coaxially arranged about the first contact of the electrode head respectively with an inner terminal and an outer terminal of the cable plug similarly arranged.
- a plastic casing enveloping the whole unit of electrode head clampingly engages another plastic casing enveloping the entire cable plug.
- the casings cause simultaneous engagement of an outer thread and an o-ring of the electrode head respectively with an inner thread and a shoulder of the cable plug.
- the electrode head is also provided with a thin metallic shield which is slidably mounted on the inner wall of the plastic casing and which is electrically connected to the second contact to serve as an electric shield so that the electrode plug head will be leak-proof when the electrode head and the cable plug are connected.
- FIG.1 A first figure.
- the present invention relates to a novel electrode such as a combined measuring electrode and single-rod measuring chains.
- a novel electrode such as a combined measuring electrode and single-rod measuring chains.
- it is customary to provide in one part, i.e., in the so-called electrode head, by soldering or welding together, a fixed electric connection between the contact wires located in the electrode, and the so-called contact or connection cable.
- the electrical connection is provided by pressure contacts or by soldered-on or welded-on contacts at the contact cable and at the contact wires located in the electrode.
- the contact cable is fixed in the electrode head in such a manner that cable and electrode together form a unit.
- measuring electrodes normally have a high internal resistance 2 lOMQ
- electrostatic shielding a shielded cable, a so-called coaxial cable, as constant cable.
- the cable core is connected to the measuring system proper, and the electrostatic shield surrounding the cable core and usually constructed as a dense copper lattice, is electrically connected either to the electrostatic shield, which in the electrode surrounds the measuring system concentrically, or in the case of singlerod measuring chains, to the reference system which functions also as a shield.
- connection is frequently produced in the manner described above.
- a further possibility of providing a connection consists in the use of electrode heads shaped as plug sockets or screw clamps.
- coaxial connections may also be involved, the contact for the measuring electrode being arranged, corresponding to the structure of the coaxial cable, in the plug center.
- the contact surface for the shield which usually constitutes also the outer casing of the plug head, is surrounded by an insulating material and is arranged concentrically about the middle contact.
- Electrodes having a rigidly connected cable present the following disadvantages: Cable replacement is not possible complicating contact plug replacement. When the electrode becomes defective, the cable and usually also the connecting plug are thrown away. Due to the permanent fixation of the cable, the electrode cannot easily be stored in a state ready for measurement. This is especially troublesome when the cable is long.
- the shield i.e., in single-rod measuring chains the reference electrode contact
- the shield is not an insulated outer casing.
- the reference system is short-circuited by way of the resulting shunt resistance.
- the known plug connections are not sufficiently moisture vapor tight to maintain the insulation resistance between cable core and shield necessary for the measurement and amounting to B 5 X 10 ohm cannot be maintained in the plug head.
- the electrode heads are insulated toward the outside but the shield located in the head is not sufficient, so that in the case of strong field changes, e.g., when the head is touched, the accuracy of the measuring result is adversely influenced.
- the known construction is so complicated and so difficult to manufacture and to connect that the expenditure affects the price of the electrode disadvantageously.
- connection between the electrode head and the electrode cable is a plug and screw connection
- the plug and head are both embedded in plastic.
- the screw thread also consists of plastic;
- An additional shield is provided in the electrode head in the form of a metal casing which is arranged coaxially about the two contacts of the electrode head and is electrically connected to the coaxial portion of the coaxial socket;
- connection of the electrode head to the inner conductors thereof is a plug connection.
- the plug and screw connection of the present invention is a coaxial one:
- the second contact of the cable plug forms a wider metal casing which is slid upon this insulating cover.
- one of the contacts in the electrode head consists of a central wire, which at its end is preferably fanned out, so that it clampingly engages the narrow casing of the cable plug
- the second contact consists of a metal casing which is so wide and provided with slots in such a way that the wider casing of the cable plug engages likewise clampingly this casing of the electrode head.
- the screw threads provided on the plug and head are of such dimensions that in the manufacture of the connection the contacts described above, of the two parts must first he slid into each other over a certain length, e.g. about 2 mm, before the screw threads engage each other. Then the two parts are screwed together.
- a certain length e.g. about 2 mm
- an O-ring of rubber or other plastic material is slid upon the outer thread. This O-ring has an outer diameter substantially equal to the outer diameter of the plastic casings of the head and the plug.
- a particular characteristic of the present invention is that the electrode head is provided with an electric shield which, in the shape of a thin metallic casing, is mounted coaxially about the two aforementioned terminals of the electrode head.
- This metal casing abuts on the inside directly to the plastic wall of the electrode head, and in the manufacture of the electrode head the plastic material is suitably injected directly into the metal casing.
- connection between the contacts of the electrode head and the contact wires issuing from the electrodes proper is a plug connection, that is to say, the contacts of the electrode head end toward the inside in thin slotted metal casings into which the wires issuing from the electrodes are clamped.
- the shield casing described above is preferably shaped in such a way that it envelops also this plug connection inside the electrode.
- a plug connection and screw connection assures a good electrical contact between electrode head and cable plug and a safe damp-proof packing, to which result especially the O- ring contributes, and the long creepage path from the O-ring support by way of the plastic thread to the outer contact assures a safe protection.
- a liquid-proof closure is of decisive importance for many fields of application of measuring electrodes.
- the plug head may likewise be closed, in a moisture-proof manner, with a closure cap capable of being screwed on.
- the packing is so good that, when a sufficiently temperature-proof O-ring, eg from silicon plastic of fluorelastomer is used, the packing assures, even in steam sterilization, the required high dielectric resistance in the electrode head.
- the novel electric shield in the electric head prevents, as already mentioned, outer electrical fields, which may occur when the electrode head is being touched, from changing the measuring potential.
- the novel plug connection inside the electrode head makes possible an easy assembly of the entire measuring electrode and simplifies electrode manufacture.
- FIG. 1 is a partially cut away view of a head and FIG. 2 is a partially cut away view of a plug.
- the head comprises an inner contact 11 in the form of a fanned-out wire which extends toward the inside into a thin casing 12.
- the latter holds the conductor 20 which is electrically connected to the electrode (not shown).
- the head it further comprises a contact 13, a metal casing which changes likewise inside the electrode into a thin casing 14 capable of holding the second conductor of the head 10.
- a highly resistive insulator 19 is provided between the two contacts 11 and 13, a highly resistive insulator 19 is provided.
- a metal casing 15 is mounted coaxially about the two contacts ll and 13, which metal casing 15 serves as a shield and is connected in an electrically conductive manner to the outer contact 13.
- the whole unit is enveloped by a plastic casing 16 having an outer thread 17.
- An O-ring i8 is slid upon the shoulder between the outer thread 17 and the outer wall of the plastic casing 16.
- a plug 30 comprising an inner contact 21, a narrow metal casing 22 to which the central wire (not shown) of the electrode cable is connected.
- the outer terminal consists again of a wider metal casing 23 which is electrically connected to the outer conductor of the cable.
- the whole unit is enveloped by a plastic casing 26 into which the inner thread 27 is cut. Between the two contacts 21 and 23 a highly resistive insulator 29 is inserted.
- the plastic casing 28 is pressed by the metal part in a packing manner against the upper opening of the plastic casing.
- An electrode comprising:
- an electrode head comprising:
- a first contact forming the core of the electrode head comprising a fanned-out wire which ex tends toward the inside of the electrode head into a thin casing;
- a second contact which is a metallic casing arranged coaxially about the first contact and provided with a slot formed by a thin bent wire extending inside the electrode head into a thin cas- 3.
- an insulating plastic casing enveloping the whole unit of electrode head comprising an outer thread and a shoulder on an outer wall, and an O-ring upon the shoulder;
- a cable plug comprising:
- an inner terminal centrally disposed inside the electrode plug, in the form of a narrow metallic casing that fits into the fanned-out end of the first contact of the electrode head;
- means for establishing an electrical connection between said electrode head and cable plug comprising clampingly engaging the two said plastic casings after the following connections take place:
- the inner thread of the insulating plastic casing of the cable plug screws into the outer thread of the insulating plastic casing of the electrode head so that the O-ring of the electrode head rests against the shoulder of said plastic casing of the cable plug.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE7208139U DE7208139U (de) | 1972-03-03 | 1972-03-03 | Elektroden-Steckkopf |
Publications (1)
Publication Number | Publication Date |
---|---|
US3832675A true US3832675A (en) | 1974-08-27 |
Family
ID=6628670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00296968A Expired - Lifetime US3832675A (en) | 1972-03-03 | 1972-10-12 | Electrode comprising a head and a detachable plug |
Country Status (3)
Country | Link |
---|---|
US (1) | US3832675A (de) |
CH (1) | CH541150A (de) |
DE (1) | DE7208139U (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2700880A1 (de) * | 1976-01-14 | 1977-07-21 | Proton Ag | Messelektrode, insbesondere glaselektrode |
US4284321A (en) * | 1978-06-28 | 1981-08-18 | Schott-Geraete Gmbh | Electrode head |
US4674809A (en) * | 1986-01-30 | 1987-06-23 | Amp Incorporated | Filtered triax connector |
US4925404A (en) * | 1988-10-14 | 1990-05-15 | G & H Technology, Inc. | Environmentally protected EMI shielded connector |
US20080146064A1 (en) * | 2004-09-21 | 2008-06-19 | Bankstahl Herbert A | High-Power Electrical Quick Connector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10256649A1 (de) * | 2002-12-03 | 2004-06-24 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Sensorsteckkopf insbesondere für einen potentiometrischen Sensor und potentiometrischer Sensor mit Sensorsteckkopf |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2119452A (en) * | 1934-10-13 | 1938-05-31 | Woodhead Daniel | Electric connecter |
US2742622A (en) * | 1953-04-02 | 1956-04-17 | Whitney Blake Co | Cable connector |
US3124406A (en) * | 1964-03-10 | Coaxial connector | ||
US3643208A (en) * | 1969-05-21 | 1972-02-15 | Dynamics Corp America | Underwater separable connector |
-
1972
- 1972-03-03 DE DE7208139U patent/DE7208139U/de not_active Expired
- 1972-10-12 US US00296968A patent/US3832675A/en not_active Expired - Lifetime
- 1972-11-02 CH CH1595672A patent/CH541150A/de not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124406A (en) * | 1964-03-10 | Coaxial connector | ||
US2119452A (en) * | 1934-10-13 | 1938-05-31 | Woodhead Daniel | Electric connecter |
US2742622A (en) * | 1953-04-02 | 1956-04-17 | Whitney Blake Co | Cable connector |
US3643208A (en) * | 1969-05-21 | 1972-02-15 | Dynamics Corp America | Underwater separable connector |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2700880A1 (de) * | 1976-01-14 | 1977-07-21 | Proton Ag | Messelektrode, insbesondere glaselektrode |
US4284321A (en) * | 1978-06-28 | 1981-08-18 | Schott-Geraete Gmbh | Electrode head |
US4674809A (en) * | 1986-01-30 | 1987-06-23 | Amp Incorporated | Filtered triax connector |
US4925404A (en) * | 1988-10-14 | 1990-05-15 | G & H Technology, Inc. | Environmentally protected EMI shielded connector |
US20080146064A1 (en) * | 2004-09-21 | 2008-06-19 | Bankstahl Herbert A | High-Power Electrical Quick Connector |
Also Published As
Publication number | Publication date |
---|---|
DE7208139U (de) | 1972-05-18 |
CH541150A (de) | 1973-08-31 |
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