US3573815A
Expired / Lapsed
US
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Measuring point scanner
Assignee: ELECTROFACT RADIUMWEG 30 AMERSFOORT NETHERLANDS A Co OF NETHERLANDS BV
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Filing: 1968-06-13
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Granted: 1971-04-06
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Expires: 1988-06-13
Abstract
Abstract A device for successively scanning and monitoring a plurality of measuring points which device provides an alarm when a measured point exceeds a predetermined value and a different alarm when there is a malfunction in the device itself.
Inventors
- 👤 Johannes Leijten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:30
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/15; H03K5/15013; G; G08; G08B; G08B26/00; G08B26/005; G08B29/00; G08B29/02; G08B29/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
134 words
Device for cyclically scanning and monitoring a plurality of measuring points, comprising a scanner provided with a selfstepping measuring point selector having a plurality of selector contacts, and a common monitoring device to which these measuring points are successively connected, said monitoring device having means for giving a warning as soon as a measuring point connected to it supplies a measuring value which exceeds a predetermined limit value and for issuing a warning if the stepping is discontinued, an internal logic circuit being provided for discontinuing the stepping action of said selector on alarm occasions in the event there is a malfunction on the device which endangers its reliable operation, said stepping action also being discontinued when the measuring value of the measuring point connected to the monitoring device exceeds a predetermined limit value.
Claim 2
Dependent Claim
134 words
Device for cyclically scanning and monitoring a plurality of measuring points, comprising a scanner provided with a selfstepping measuring point selector having a plurality of selector contacts, and a common monitoring device to which these measuring points are successively connected, said monitoring device having means for giving a warning as soon as a measuring point connected to it supplies a measuring value which exceeds a predetermined limit value and for issuing a warning if the stepping is discontinued, an internal logic circuit being provided for discontinuing the stepping action of said selector on alarm occasions in the event there is a malfunction on the device which endangers its reliable operation, said stepping action also being discontinued when the measuring value of the measuring point connected to the monitoring device exceeds a predetermined limit value.
Claim 3
Dependent Claim
57 words
Device in accordance with claim 1, wherein the selector is operatively connected to a pair of leads which are energized alternately in successive selector positions, said leads being connected to a device which gives a warning if successive alternate energizations of the leads by said selector do not occur at a rate exceeding a predetermined limit rate.
Claim 4
Dependent Claim
85 words
Device in accordance with claim 2, wherein each of the pair of leads is connected to a capacitor shunted by a resistor, the output connection of each capacitor through a diode being connected to the input terminal of a level discriminator, which input terminal through a resistor is connected to a voltage source which tends to maintain the level discriminator in a condition in which no alarm is given as long as each of the diodes is blocked by the voltage of the appertaining capacitor.
Claim 5
Dependent Claim
44 words
Device in accordance with claim 1, wherein the selector is provided with a stepping lead which enables the stepping action of the selector as long as it is energized, the energization being provided by the monitoring device as long as no alarm occasion occurs.
Claim 6
Dependent Claim
58 words
Device in accordance with claim 4, wherein the selector is so designed that upon closing one of its plurality of selector contacts, it also closes a carry contact which through a time delay device connects the common stepping lead to the input terminal of a stepping device which upon energization brings the selector into the next successive position.
Claim 7
Dependent Claim
40 words
Device in accordance with claim 4, wherein the stepping lead energization is so governed by the monitoring device, that it is discontinued if the measuring value of the measuring point under observation at any given time, exceeds a predetermined value.
Claim 8
Dependent Claim
35 words
Device in accordance with claim 4, wherein the stepping lead is energized through a circuit including a logic gate which is adapted to receive at each of its input terminals a signal representing a fault.
Claim 9
Dependent Claim
49 words
Device in accordance with claim 7, wherein the stepping device is self-holding and the selector is so designed that upon closing one of its plurality of selector contacts, it actuates a further contact which terminates the self-holding action and removes a signal from an input of the logic gate.
Claim 10
Dependent Claim
53 words
Device in accordance with claim 8, wherein the selector is so designed that upon closing one of its plurality of selector contacts, it actuates a further contact selecting at least one limit value of the monitoring device, the current through said contact removing a signal otherwise existing at an input of the gate.
Claim 11
Dependent Claim
43 words
Device in accordance with claim 9, wherein each measuring circuit closed through one of the plurality of selector contacts, cooperates with a continuity measuring device, which supplies a signal to a gate input if the measuring circuit impedance exceeds a predetermined limit value.
Claim 12
Dependent Claim
60 words
Device in accordance with claim 1, wherein the selector cooperates with a register which stores the information that a predetermined limit value has been exceeded by the measuring value of a given measuring point, until upon a subsequent scanning of that measuring point by the selector, it turns out that said measuring value no longer exceeds said predetermined limit value.
Claim 13
Dependent Claim
75 words
Device in accordance with claim 11, wherein the scanner is so designed that upon closing one of its plurality of selector contacts, it actuates a register address contact which if at that time the measuring value of the measuring point connected through said selector contacts exceeds a predetermined limit value, provides for insertion of an indication thereof at said register address and, if a fault in the insertion circuit occurs, actuates a register alarm unit.
Claim 14
Dependent Claim
28 words
Device in accordance with claim 11, wherein the register is so designed, that a failure to store inserted information results in the actuation of the register alarm unit.
Claim 15
Dependent Claim
18 words
Device in accordance with claim 13, wherein the register alarm unit upon its actuation deenergizes the stepping lead.
Claim 16
Dependent Claim
36 words
Device in accordance with claim 1, wherein the monitoring device comprises separate alarm units, each of which becomes operative when the measuring value of the measuring point connected at that time exceeds a respectivE limit value.
Claim 17
Dependent Claim
35 words
Device in accordance with claim 15, wherein the monitoring device comprises a separate alarm circuit, which with a delay exceeding twice the stepping period, becomes operative after the stepping action of the scanner has ceased.
Claim 18
Dependent Claim
32 words
Device in accordance with claim 7, wherein the monitoring device comprises a further circuit which upon the actuation of the logic gate prevents the subsequent actuation of the limit value alarm circuit.
Claim 19
Dependent Claim
94 words
Device in accordance with claim 1, wherein the scanner comprises a plurality of identical units connected in a ring, each unit comprising a relay with a set of contacts including contacts for connecting the respective measuring point, said relay being energized through a thyristor, the gate circuit of which is energized through a relay contact of the preceding unit, each relay further comprising a contact which upon actuation of the relay short circuits the thyristor of the same unit, the energization of each relay causing the deenergization of the relay in the preceding unit.
Claim 20
Dependent Claim
70 words
Device in accordance with claim 18, wherein a plurality of storage addresses are provided in a register and are set up successively upon the scanner attaining a respective position, each such storage address upon having been set up and becoming energized by the monitoring device signalizing that the measuring value has exceeded a respective limit value and that the scanner has thereby been stopped for more than a predetermined period.
Claim 21
Dependent Claim
22 words
Device in accordance with claim 19, wherein each storage address is adapted for separate storage of limit alarms concerning different limit values.
Claim 22
Dependent Claim
17 words
Device in accordance with claim 20, wherein the different alarms of each storage address are mutually exclusive.
Claim 23
Dependent Claim
30 words
Device in accordance with claim 19, in which each storage address is adapted for being reset upon its being set up at a time at which no limit alarm prevails.
Claim 24
Dependent Claim
31 words
Device in accordance with claim 19, wherein each storage address is adapted for removing existing alarms in that storage address upon the entering of a new alarm in that storage address.
References Cited (Backward Citations)
US2584680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |