WO2001081876A2 - Anordnung zur detektion eines flüssigkeitspegels - Google Patents
Anordnung zur detektion eines flüssigkeitspegels Download PDFInfo
- Publication number
- WO2001081876A2 WO2001081876A2 PCT/DE2001/001410 DE0101410W WO0181876A2 WO 2001081876 A2 WO2001081876 A2 WO 2001081876A2 DE 0101410 W DE0101410 W DE 0101410W WO 0181876 A2 WO0181876 A2 WO 0181876A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrodes
- circuit
- liquid
- sensor
- evaluation
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/243—Schematic arrangements of probes combined with measuring circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/242—Mounting arrangements for electrodes
Definitions
- the invention relates to an arrangement for the detection of a liquid level, in particular the water level in an aggregate, according to the preamble of the main claim.
- the arrangement for detecting a liquid level mentioned at the outset has electrodes in the region of the liquid level to be monitored, the electrodes being connected to an electronic evaluation circuit by means of which the change in resistance between the electrodes upon contact with the liquid cannot be converted into an evaluation signal.
- the evaluation signal is used to signal that the level has been exceeded.
- the sensor is advantageously connected to the switching module together with a timing element, so that when the supply voltage for the evaluation circuit is switched on, signaling takes place in a time period predetermined with the timing element even without contact of the electrodes with the liquid.
- the timing element is a simple and space-saving R-C circuit which is connected to the control input of the switching module with its central connection and the sensor with the resistive electrode path is parallel to the capacitor of the R-C circuit. It is particularly advantageous if the switching module is a field effect transistor, preferably a MOSFET.
- the signal output of the field effect transistor is routed to the input of a Darlington circuit, with means that the signaling, for example with a lamp, can be carried out via very precisely adjustable switching times.
- the time period of the signaling when the arrangement is switched on depends on the dimensioning of the timing element, in particular the RC circuit, but is not influenced by the length of the electrodes of the sensor.
- the arrangement is installed in a compact sensor module which can be plugged or screwed onto a liquid container to be monitored.
- Simple assembly and a compact housing shape can be achieved if the electrodes are attached on the inner side facing the liquid and there is a circuit board in contact with the electrodes with the evaluation circuit.
- the contact can be made, for example, by welding and then encapsulated with silicone, for example, to protect the electronic components on the circuit board.
- the previously described unit can be welded on the outer side to the plug pins of a plug so that a corresponding evaluation signal can be processed further.
- These preassembled components can then be easily extrusion-coated, for example with plastic, to produce the entire sensor module, so that the desired installation shape is produced.
- FIG. 1 shows a schematic section through a sensor module for monitoring a water level
- FIG. 2 shows a circuit diagram of an evaluation circuit of the sensor module
- Figure 3 is a circuit diagram of an extended evaluation circuit of the sensor module with a Darlington power amplifier
- Figure 4 shows a curve of a voltage measured with the water level over time.
- FIG. 1 shows a cut-open sensor module 1 with two electrodes 2 and 3, which come to rest after installation in a liquid container (not shown here) and detect contact with the liquid, here water.
- the electrodes 2 and 3 are concludes contacted on a circuit board 4, on which the evaluation circuit explained below is attached.
- the other connections of the printed circuit board 4 are contacted with plug pins 5, which are located in a plug housing 6 as part of the sensor module 1.
- a circuit diagram of an evaluation circuit according to FIG. 2 shows a field effect transistor Q1, which is supplied with a switching signal via an R-C circuit with a capacitor C1 in the size of approximately 1 ⁇ F and a resistor R2 in the size of approximately 2.2 M.
- a signal means L e.g. a lamp, driven.
- the electrodes 2 and 3 are shown here schematically as a sensor S, which is parallel to the capacitor C1 with the resistance of the path between the electrodes 2 and 3.
- the evaluation circuit according to FIG. 2 is supplied with a supply voltage U, which is additionally stabilized here via a resistor Rl and a zener diode Dl, e.g. to about 5 V.
- an exemplary embodiment according to FIG. 3 also has a Darlington output stage Q2 connected downstream of the field effect transistor Q1 and via which the signaling means L is controlled.
- the field effect transistor Q1 or also the Darlington output stage Q2 according to FIG. 2, is also controlled, so that the signaling means L is actuated, e.g. by lighting up a lamp.
- the signaling means L is actuated, e.g. by lighting up a lamp.
- this state remains as if from one Diagram according to FIG. 4, which shows the profile of the voltage u1 on the signal means L, can be seen.
- the course in FIG. 4 shows the conditions in the circuit according to FIG. 3; the course in the circuit according to FIG. 2 would result in a flatter falling edge.
- the signaling means L goes out provided that the resistance gap between the electrodes 2 and 3 in the sensor S is large enough.
- the resistance becomes so low that the field effect transistor Q1 is opened again and the signaling means L is actuated again until the water level drops and the electrodes 2 and 3 are released.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Level Indicators Using A Float (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10020081.8 | 2000-04-22 | ||
DE2000120081 DE10020081A1 (de) | 2000-04-22 | 2000-04-22 | Anordnung zur Detektion eines Flüssigkeitspegels |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001081876A2 true WO2001081876A2 (de) | 2001-11-01 |
WO2001081876A3 WO2001081876A3 (de) | 2002-03-07 |
Family
ID=7639779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001410 WO2001081876A2 (de) | 2000-04-22 | 2001-04-10 | Anordnung zur detektion eines flüssigkeitspegels |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10020081A1 (de) |
WO (1) | WO2001081876A2 (de) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3668630A (en) * | 1970-06-22 | 1972-06-06 | Ford Motor Co | Low liquid level indicator |
US4356480A (en) * | 1980-09-11 | 1982-10-26 | Minnesota Mining And Manufacturing Company | Liquid level sensing circuitry |
US4367462A (en) * | 1981-01-05 | 1983-01-04 | Minnesota Mining And Manufacturing Company | Liquid level sensing circuitry |
US5239203A (en) * | 1990-03-30 | 1993-08-24 | Texand Corporation | Common ground control switch for an irrigation system |
DE4313404A1 (de) * | 1992-05-13 | 1993-11-18 | Spirax Sarco Ltd | Datengeber für Kondensationsfallen |
US5755105A (en) * | 1996-02-20 | 1998-05-26 | Lacoste; Marvin | Air conditioning system fluid level controller |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5727550Y2 (de) * | 1979-01-10 | 1982-06-16 | ||
JPH0752113B2 (ja) * | 1990-05-08 | 1995-06-05 | 株式会社村田製作所 | 液面センサ |
DE4017314A1 (de) * | 1990-05-30 | 1991-12-05 | Twl Hydrokultur Gmbh | Vorrichtung zum anzeigen des fluessigkeitsstandes in einem gefaess, vorzugsweise pflanzengefaess |
DE4424240C2 (de) * | 1993-12-10 | 1995-11-02 | Telefunken Microelectron | Schaltungsanordnung mit einem Anzeigeinstrument |
JPH1114663A (ja) * | 1997-06-27 | 1999-01-22 | Mitsubishi Electric Corp | 物理量センサ |
-
2000
- 2000-04-22 DE DE2000120081 patent/DE10020081A1/de not_active Withdrawn
-
2001
- 2001-04-10 WO PCT/DE2001/001410 patent/WO2001081876A2/de active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3668630A (en) * | 1970-06-22 | 1972-06-06 | Ford Motor Co | Low liquid level indicator |
US4356480A (en) * | 1980-09-11 | 1982-10-26 | Minnesota Mining And Manufacturing Company | Liquid level sensing circuitry |
US4367462A (en) * | 1981-01-05 | 1983-01-04 | Minnesota Mining And Manufacturing Company | Liquid level sensing circuitry |
US5239203A (en) * | 1990-03-30 | 1993-08-24 | Texand Corporation | Common ground control switch for an irrigation system |
DE4313404A1 (de) * | 1992-05-13 | 1993-11-18 | Spirax Sarco Ltd | Datengeber für Kondensationsfallen |
US5755105A (en) * | 1996-02-20 | 1998-05-26 | Lacoste; Marvin | Air conditioning system fluid level controller |
Also Published As
Publication number | Publication date |
---|---|
WO2001081876A3 (de) | 2002-03-07 |
DE10020081A1 (de) | 2001-10-25 |
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