瑞士专利CH712638A2 Measuring method and measuring device for a liquid detection system.

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专利摘要:
The invention relates to a measuring method and a measuring device for a liquid detection system (10), in particular for a water alarm system, in which liquid sensors (15) with known complex resistance values act in a first measuring environment with a first direct voltage and / or with a first direct current during a first time duration after which at least one output of the liquid sensor (15) after the first time period, the DC voltage or the DC current are measured and then during a second period of a second DC voltage and / or a second DC current with a different polarity at the first voltage input or a second voltage input the liquid sensor (15) is applied and the measurement is repeated, whereby resulting AC voltage and / or AC current at the liquid sensor (15) is measured, so that a detection of indicative information at the liquid sensor (15) erfo lgt, wherein the indicative information on the one hand includes the detection of a liquid on the liquid sensor (15) and / or on the other hand, the detection of a disturbance, in particular a sensor or line break, the liquid sensor (15).
公开号:CH712638A2
申请号:CH00831/16
申请日:2016-06-30
公开日:2018-01-15
发明作者:Kummer Adrian；Foscan Claudio
申请人:Wunderli Electronics Ag；
IPC主号:

专利说明:

Description: [0001] The invention relates to a measuring method and a measuring device for a liquid detection system, according to the preambles of claims 1 and 9.
Liquid detectors are used for detection or level monitoring of liquids, the prior art mainly knows devices that detect water.
A method or apparatus for determining the water content in soils and bulk solids is disclosed for example in DE 10 256 064 B4 wherein there is additionally indicated a conductivity determination. Disadvantage of the known prior art is that here a capacitive sensor is controlled so that several voltage-time-Dia-grams or charging times are recorded and then mathematically verified. For this purpose, different RC elements are necessary, which have different and very high measurement frequencies and are evaluated only for water content measurement. This leads to unnecessary high computer performance, expensive data acquisition devices and complex measurement components. In addition, a relative water content is measured here and not just the knowledge whether water is present or not. Often, however, such detail information is not essential, but only the digital information "liquid there or not". The known structure also discloses no accident detection. This is disadvantageous because users are never sure that their system is working properly. Due to the high measuring frequency up to the MHz range, only relatively short leads are possible or corresponding HF conductors which are difficult to install, since parasitic conduction capacitances and disturbing influences quickly outweigh the long unshielded leads.
The object of the present invention is therefore to eliminate the disadvantages of the known methods and devices for liquid detection system and to disclose a measuring method for detecting the presence of conductive liquids on the one hand and on the other hand, the detection of a disturbance on the liquid sensor, which the two events on the liquid sensor in the evaluation can differ.
The object is solved by the features of the independent measuring method claim 1 and the independent measuring apparatus claim 9. Advantageous developments are set forth in the figures and in the dependent claims.
The particularly simple and inexpensive inventive measuring method can be used in liquid detection systems for the detection of conductive liquids, with conductive ions, such as water, milk, acids, chemicals or alcohols.
The invention describes the measuring method for in particular a water alarm system. The measuring method initially comprises introducing at least one first liquid sensor having a known complex resistance value, in particular a known complex line resistance value and / or a known complex sensor resistance value, in a first measurement environment. Subsequently, a first DC voltage and / or a first DC current with a first polarity is applied to at least a first voltage input of the liquid sensor. The application of the first DC voltage and / or of the first DC current takes place with the first polarity during a first time duration. This is followed by measuring the first DC voltage and / or a first DC current at at least one output of the liquid sensor after the first time period, applying a second DC voltage and / or a second DC current having a second polarity at the first voltage input or a second voltage input of the liquid sensor during a first or second time duration and the detection of the alternating voltage and / or the alternating current, at least one first half-wave signal value of this voltage and / or of this current, arising from the preceding method steps, at the liquid sensor. This is followed by comparing at least one first half-wave signal value of a known voltage and / or current with at least the current half-wave signal value of an alternating voltage and / or alternating current at the liquid sensor, the method steps preferably being carried out periodically after the introduction of the liquid sensor and the detection of indicative information at the liquid sensor, wherein the indicative information on the one hand includes the detection of a liquid on the liquid sensor and / or on the other hand, the detection of a disturbance, in particular a sensor or line break, the liquid sensor.
Advantageously, on the one hand, the particularly simple differentiability of the liquid detection, which is carried out in particular by conductance measurement on the liquid sensor, and the disturbance detection on the liquid sensor, in the liquid detection system and on the other hand avoiding measurement errors and corrosion at the liquid sensor, which are based for example on electrolysis effects, if the Liquid sensor is at a fixed reference potential.
Preferably, the preceding method steps, starting with the application of a first DC voltage and / or a first DC current at least a first voltage input of the liquid sensor to including the step of detecting the AC voltage and / or AC current at the liquid sensor after initial installation for Determining a reference value at least once-if necessary several times - made to determine at least a first half-wave signal value of the known AC voltage and / or AC current, wherein preferably the known AC and / or AC current value is stored in a nonvolatile value storage unit.
Advantageously, with this method step, the liquid detection system is set to a, the individual measurement environment, associated reference value and made comparable to the current AC and / or AC current value depending on the current measurement environment. The sensitivity of the liquid sensors of the liquid detection systems, for example, depends on the line length of the individual liquid sensor and is particularly improved due to the self-learning step performed.
Preferably follows after applying a second DC voltage and / or a second DC current having a second polarity at the first voltage input or a second voltage input of the liquid sensor during the first or a second period of time, measuring the second DC voltage and / or the second DC current at the or another outlet of the liquid sensor after the first or second time period. Advantageously, a second half-wave signal value of the current voltage and / or current can thus also be detected at the liquid sensor and thus the evaluation of the comparison signal can be improved.
Preferably, the above-mentioned method steps, starting with the application of a first DC voltage and / or a first DC current with a first polarity at least a first voltage input of the liquid sensor to inclusive of the process step of detecting the AC voltage and / or AC current at the liquid sensor on the liquid sensor after more than 1 ms, in particular more than 50 ms, preferably every 22 ms.
The advantage of the measuring device in the short measuring time range lies in the reduction of the susceptibility of the measurement itself and allows particularly long lines without technically complicated cable shielding.
Preferably, as an additional measuring method step, an alarm signal is triggered if a deviation between the known alternating voltage value and / or alternating current value, at least the first half-wave signal value of this voltage and / or current and the current alternating voltage value and / or alternating current value, at least the first half-wave signal value of this Voltage and / or this current, occurs. As a result, the user of the liquid detection system is advantageously informed on the one hand regarding liquid detection at the liquid sensor and / or a disturbance detection - for example a sensor break - in the liquid sensor and on the other hand, further internal or external security steps in a higher-level system, for example in a building monitoring system, be made and thus as soon as possible Irregularities in the liquid detection system are reacted. The alarm signal can be both acoustically, such as a horn or a piezo alarm, as well as optically, for example, a warning light, transmitted internally and / or externally via a relay and / or bus connection to a central distribution point and / or acknowledged.
Preferably, the current AC voltage values and / or AC current values are stored in a ring memory table. Advantageously, ring buffer tables can be easily and quickly filled with values and then processed without generating large amounts of data. A preferably low table depth advantageously increases the reaction time of the liquid sensor and thus additionally improves the liquid detection system.
Preferably, a DC decoupling is provided in the measuring method. This allows a DC-free detection of the AC voltage and / or the AC current at the liquid sensor and improves the comparability of the current AC voltage value and / or AC value with the known AC voltage value and / or AC value in the liquid detection system.
It is particularly preferred in the measuring method at least a second liquid sensor with - possibly the same - to introduce known complex resistance in a first or second measurement environment. Thus, a large-scale liquid sensor system is advantageously realized and distinguished, for example, between a possible liquid detection on the first liquid sensor in a first measurement environment and a possible disturbance detection on the second liquid sensor in a second measurement environment and derived from a comparison signal.
Preferably, the measuring method according to the invention is carried out in such a way that average values are formed from the respective alternating voltage and / or alternating current values of one or more liquid sensors and fed to the evaluation unit as comparison value, wherein the alternating voltage and / or alternating current values for averaging are preferably from the ring memory table In particular, the values in the table are sorted by size and only the middle table positions are used for the averaging. The advantage is that a single value is formed without potential measurement errors, namely the mean value or the median, which is formed from the entries of the sortable ring memory table and is comparable to the previously generated reference value. This leads to a fast and favorable event detection in the liquid detection system. In addition, individual insignificant signal fluctuations, such as asymmetries, are disregarded in the measurement signal of the measurement method, whereby an increased system reliability is achieved. Due to the inventive measuring method and the evaluation, the number of memory arrays is reduced by sorting and averaging, or median formation, which leads to a high evaluation quality of the measured values and short reaction times of about 100 ms in the liquid detection system.
In addition, the invention discloses a measuring device for a liquid detection system. For carrying out the method according to the invention, the measuring device comprises at least one first DC or DC source, at least one first switching element in series with the DC or DC source and at least one first liquid sensor with a known complex resistance, in particular known complex line resistance and / or known complex sensor resistance. wherein the liquid sensor is connected in series with the switching element. Furthermore, the measuring device comprises at least a first measuring unit for measuring the DC voltage value and / or DC value.
The switching element is designed such that it changes periodically in the measuring operation, the polarity of the DC voltage and / or the DC current at the first liquid sensor, that between the first liquid sensor and the first measuring unit at least a first RC element with known ohmic resistance and known capacity, is connected , wherein the resistance of the RC element is connected in parallel with the capacitance of the RC element, and in that an evaluation unit which detects the current AC voltage signal and / or AC signal at the first liquid sensor and compares with a predefined AC voltage signal and / or AC signal, and depending indicative information on the liquid sensor makes representable according to the comparison signal, wherein the indicative information at least on the one hand the detection of a liquid on the liquid sensor and / or on the other hand the detection of a disturbance, in particular a sensor or line break, on Liquid sensor includes.
The advantage of the measuring device is that a measuring method, in particular a measurement of the resistance value, with known complex resistances of the lines and the liquid sensor can be realized and that due to the circuit construction starting from a DC or DC power source, an AC signal is applied to the liquid sensor, which on the one hand no DC voltage on the liquid sensor permits and on the other hand allows long lines, since their inductive and capacitive influences are reduced in the measurement signal.
Preferably, the measuring device further comprises a second DC or DC source and / or a second switching element in series with the second DC or DC source and / or at least one second liquid sensor is provided, consisting of a complex resistor, in particular from known complex line resistance and / or known complex sensor resistance, wherein the second liquid sensor is peeled parallel to the first liquid sensor and / or that a second measuring unit for measuring the second DC voltage value and / or DC value is provided and / or that a second RC element with known resistance and known capacity before the second measuring unit is connected, wherein the RC element between the liquid sensors and the second measuring unit is peeled and / or that at least one DC decoupling unit between the first RC element and the at least first liquid sensor u nd / or the second RC element and the at least first liquid sensor is provided. Advantageously, it is thus possible to realize a liquid detection system adapted to different measuring environments, which are positioned on several, in particular different, measuring environments and makes a total measured value comparable to all reference sensors in the liquid detection system comparable to a reference value determined in advance by self-learning processes that parasitic DC voltage values and / or DC values occur in the measurement signal.
Preferably, the evaluation unit of the measuring device comprises a non-volatile value memory unit and / or an internal alarm signal unit and / or a ring memory table and / or a peak filter and / or an averaging unit and / or an external alarm unit and / or an external control unit. The advantage is that with the comprehensive evaluation unit, the measured values are sorted and analyzed before the comparison with the reference value stored in the nonvolatile value memory unit and, if appropriate, the mean value is used, thus filtering excessive and / or weak individual measured values due to disturbing influences.
Further advantages, features and details of the invention will become apparent from the following description in which embodiments of the invention are described with reference to the drawings.
The list of reference numerals, as well as the technical content of the claims and figures part of the disclosure. The figures are described coherently and comprehensively.
The same reference numerals mean the same components, reference numerals with different indices indicate functionally identical or similar components.
It shows:
Fig. 1, a representative equivalent circuit diagram of the inventive liquid detection system in its basic form
Fig. 2, a diagram with the principal voltage curves U [V] of the liquid sensor
1 shows a representative equivalent circuit of the sensor device (8) of the liquid detection system (10) with a first DC or DC source (11), a first switching element (12) and a second switching element (12 ') connected in series with the DC or DC source (11), at least a first liquid sensor (15) with a known complex resistance, in particular known complex line resistance (15a) and known complex sensor resistance (15b), wherein the liquid sensor (15 ) is connected in series with the switching element (12, 12 ') and at least one first measuring unit (13) for measuring the DC voltage value or DC value. Between the first liquid sensor (15) and the first measuring unit (13) is at least a first RC
Member (14) with known ohmic resistance (14a) and known capacitance (14b) connected, wherein the resistor (14a) of the RC element (14) is connected in parallel to the capacitance (14b) of the RC element (14). The sensor device (8) is connected to an evaluation device (9), including an evaluation unit (20) (FIG. 3). In the measuring operation, the evaluation unit (20) detects the current voltage signal or current signal, at least a first half-wave signal value of this voltage and / or current at the first liquid sensor (15) and compares this with at least a first half-wave signal value, the previously known alternating voltage or alternating current at the liquid sensor (15). Depending on the comparison signal indicative information on the liquid sensor (15) is detected, wherein the indicative information includes at least on the one hand the detection of a liquid, in particular a resistance value, on the liquid sensor and on the other hand, the detection of a disturbance, in particular a sensor or line break, the liquid sensor. The equivalent circuit diagram of the liquid detection system (10) described here may, in an alternative embodiment, comprise a further direct current or direct current source (11 ') (not shown).
FIG. 1 additionally shows at least one second liquid sensor (15 ') consisting of a complex resistor, in particular of a known complex line resistance (15a') and a known complex sensor resistance (15b '), the second liquid sensor (15') being parallel to first liquid sensor (15) is peeled and a second measuring unit (13 ') for measuring the second DC value or DC value and a second RC element (14') with known resistance (14a ') and known capacity (14b'), which before the second measuring unit (13 ') is connected, wherein the RC element (14') between the liquid sensors (15, 15 ') and the second measuring unit (13') is peeled. 1 discloses at least one DC decoupling unit (17) between the first RC element (14) and the at least first liquid sensor (15) and at least one further DC decoupling unit (18) between the second RC element (14 ') and the at least first liquid sensor (15).
According to the invention, as shown above, a plurality of liquid sensors (15, 15 ') of a sensor device (8) can be connected in parallel to one another, whereby in the future only one liquid sensor (15) will be indicated for easier readability of the measuring method according to the invention and the measuring device.
The advantage of the liquid detection system (10) is that in the simplest device embodiment, a measuring method with known complex resistors (15a, 15b) of the lines (16) and the liquid sensor (15) can be realized and that due to the circuit structure, starting from at least one DC voltage - or DC power source (11) an AC voltage signal to the liquid sensor (15) is applied, which on the one hand does not allow DC voltage to the liquid sensor (15) and on the other hand long lines (16) allowed, since their capacitive and inductive influences are reduced to the measurement signal.
In FIG. 2, the current time t [ms] and the ordinate voltage level U [V] are shown in a coordinate system on the abscissa for the measuring method according to the invention with regard to the representative circuit of FIG. The measuring method initially comprises the introduction of at least one first liquid sensor (15) with known complex line resistance value (15a) and known complex sensor resistance value (15b) in a first measurement environment. Subsequently, a first DC voltage or a first DC current having a first polarity is applied to at least one first voltage input of the liquid sensor (15) at the time t0. The application of the first DC voltage or of the first DC current takes place with the first polarity during a first time duration (t1-to), whereby the first switching element (12) is brought into a contacting state and at the same time the second switching element (12 ') is not in one contacting state is located. This is followed by measuring the first DC voltage or the first DC current (80) of the first DC voltage source or DC source (11), in particular the measurement of the resistance value, at at least one output of the liquid sensor (15) after the first time period t1, in particular at the first RC element (14), with the first measuring unit (13). This is followed by the application of a second DC voltage or a second DC current having a second polarity at the first voltage input or a second voltage input of the liquid sensor (15) during a second time period (t1-t2), wherein the second switching element (12 ') in a contacting state is brought and at the same time, the first switching element (12) is in a non-contacting state and the detection of the resulting by the preceding process steps alternating voltage or alternating current (101) on the liquid sensor (15). It is advantageous that the first time duration (t1-t0) and the second time duration (t2-t1) are as long as possible. In a variant of the measuring method (in addition to the described), the measurement of the second DC voltage or of the second DC current or resistance conductance takes place at the same output of the liquid sensor (15) after the first or second time period t2, in particular at the first RC element (14) a first measuring unit (13).
This is followed by comparing at least one first half-wave signal value of a known voltage and / or current with at least the current half-wave signal value of an alternating voltage and / or alternating current (101) at the liquid sensor (15) - in particular the maximum value - wherein the said method steps begin after the introduction step of the liquid sensor (15), preferably periodically, in particular a plurality of times (tO ..... tx), and the detection of indicative information takes place at the liquid sensor (15).
The indicative information defines on the one hand the detection of a liquid (121) on the liquid sensor or on the other hand the detection of a disturbance (111), in particular a sensor or line break, at the liquid sensor (15).
On the one hand, the particularly simple distinguishability of the liquid detection (121) is advantageous, which is characterized by a lower current AC value or AC value (in particular the lower maximum value) with respect to a known AC value or AC value and the disturbance detection (111), which is characterized by an increased current AC voltage value or AC value (in particular the increased maximum value) with respect to a known AC voltage value or AC current value on the liquid sensor.
Particularly advantageous is the prevention of measurement errors on the liquid sensor (15), which can be based for example on electrolysis effects, when the liquid sensor (15) is at a fixed reference potential.
Preferably, the preceding method steps, starting with the application of a first direct current or a first direct current with a first polarity at least a first voltage input of the liquid sensor (15) to inclusive of the process step of detecting the alternating voltage or alternating current at the liquid sensor (15) the first installation for establishing a reference value at least once - if necessary several times - carried out to determine at least a first Flalbwellensignalwert the known alternating voltage and / or alternating current, wherein preferably the known AC and / or AC current value in a nonvolatile value memory unit (25) - for example a Solid state memory such as EEPROM, SD, SSD, etc. - deposited in the evaluation device (9). Thus, prior to routine use, the liquid detection system (10) is taught to the measurement environment, preferably at dry measurement ambient conditions, at the time of installation.
For example, the reference value for a sensor break is stored in advance in the nonvolatile value memory unit (25) and the reference value for the liquid detection is set using an adjustable resistor (in particular a potentiometer) and continuously compared with the current measured value. By means of adjustable resistance and reference value, the sensitivity range of the liquid detection system (10) is determined and thus adaptable to the respective application, said adjustable resistor and the self-learning process also externally - for example via a bus system, wireless in the IdT network or a smartphone application via radio technology - is controllable. Advantageously, with this method step, the liquid detection system (10) is related to a reference value associated with the individual measurement environment and made comparable to the current AC and / or AC current value depending on the current measurement environment. The sensitivity of the liquid sensors (15, 15 ') of the liquid detection systems (10), for example, on the length of the line (16) and the number of liquid sensors (15, 15') dependent and is particularly improved due to the self-learning steps performed.
Preferably, after applying a second DC voltage and / or a second DC current having a second polarity at the first voltage input or a second voltage input of the liquid sensor during the first or a second period of time, measuring the second DC voltage or the second DC current (80 ') of the first or second DC voltage source or DC power source or resistor conductance at another output of the liquid sensor (15) after the first or second time period t2 on the second RC element (14'), with a second measuring unit (13 ') as in Fig. 2 can be seen. Advantageously, a second half-wave signal value of the current voltage and / or current can thus also be detected at the liquid sensor and thus the evaluation of the comparison signal can be improved.
Preferably, the above-mentioned process steps, starting with the application of a first DC voltage or a first DC current with a first polarity at least a first voltage input of the liquid sensor (15) to including the process step of detecting the AC voltage or AC current at the liquid sensor (15) respectively after more than 1 ms, in particular more than 50 ms, preferably, every 22 ms performed. This corresponds to a measuring frequency of 45 Hz and is advantageously outside the possible interference frequencies, for example mains frequencies (50 Hz, 60 Hz) or track frequencies (16.6 Hz), and their higher harmonic frequencies.
The advantage of the measuring device in the low measuring frequency range, in particular below 1 kHz, lies in the reduction of the susceptibility to interference, due to the complex influences of the line and the measurement itself and allows particularly long lines without technically complicated cable shielding devices.
Preferably, the current alternating voltage values and / or alternating current values are stored in a ring memory table (30), for example a first-in-first-out table. Advantageously, ring buffer tables can be easily and quickly filled with values and then processed without generating large amounts of data. A low table depth advantageously increases the reaction time of the liquid sensor (15) and additionally improves the liquid detection system (10).
Fig. 1 shows a DC decoupling (17, 18) by means of capacitors. This allows a DC-free detection of the AC voltage or AC current at the liquid sensor (15) and improves the comparability of the current AC value or the AC value with the known AC value or AC value in the liquid detection system (10).
In Fig. 3, the liquid detection system (10) consisting of the sensor device (8) and an evaluation device (9) is shown. The detailed description of the sensor device (8) is disclosed in FIG. The evaluation device (9) comprises the evaluation unit (20) of the measuring device - for example a processor unit (microprocessor, ASIC, etc.), a nonvolatile value memory unit (25), an internal alarm signal unit (23), a ring memory table (30), a peak value filter (50 ), an averaging unit (40), an external alarm unit (26), a display (31) and an internal operating unit (32) and an external operating unit (60), all of which are connected to each other, in particular with data lines or by radio link. The internal operating unit (32) and external operating unit (60) comprise in particular an alarming, control and acknowledgment unit. The advantage resides in the fact that with the comprising evaluation unit (20) the measured values are sorted and analyzed before the comparison with the reference value stored in the non-volatile value memory unit (25) and, if appropriate, the mean value is used for the comparison, thus filtering excessive or weak individual measured values as well as an improved evaluation quality is realized.
In a further preferred embodiment of the measuring device, at least one second sensor device (8 ') is provided in the liquid detection system (10) for the existing evaluation device (9) (not shown). Advantageously, a plurality of liquid sensors (15, 15 ', 15 ") can thus be arranged in measuring environments which are remote from one another, for example in different floors of a building or in different zones, and via a common evaluation device (9), preferably a common evaluation unit (20). , be evaluated.
[0037] 8 first sensor device 8 'second sensor device 9 evaluation device 10 liquid detection system 11 first DC or DC source 11' second DC or DC source 12 first switching element 12 'second switching element 13 first measuring unit 13' second measuring unit 14 first RC element 14a ohmic resistance of the first RC element 14b Capacitance of the first RC element 14 'Second RC element 14a' Ohmic resistance of the second RC element 14b 'Capacity of the second RC element 15 First liquid sensor 15a Ohmic resistance of the first liquid sensor 15b Capacity of the first liquid sensor 15 second liquid sensor 15a 'ohmic resistance of the second liquid sensor 15b' capacitance of the second liquid sensor 17 first DC decoupling unit 18 second DC decoupling unit 20 evaluation unit 23 internal alarm signal unit 25 nonvolatile value storage unit 26 external alarms nit

权利要求:
Claims (11)
[1]
30 ring memory table 31 display 32 internal operating unit 40 averaging unit 50 peak value filter 60 external operating unit 80 first DC voltage or first DC 80 'second DC voltage or second DC 101 AC voltage or AC current at the liquid sensor 111 detection of a malfunction at the liquid sensor 121 detection of a liquid at the liquid sensor tO start time t1 first time period t2 second time period tx x-periods patent claims
1. Measuring method for a liquid detection system (10), in particular a water alarm system comprising the following method steps: a) introducing at least a first liquid sensor (15) with known complex resistance, in particular known complex line resistance value and / or known complex sensor resistance, in a first measurement environment; b) applying a first DC voltage and / or a first DC current having a first polarity to at least a first voltage input of the liquid sensor (15); c) wherein the first DC voltage and / or the first DC current is applied with the first polarity during a first time period; characterized by, d) measuring the first DC voltage and / or the first DC current at at least one output of the liquid sensor (15) after the first time period; e) applying a second DC voltage and / or a second DC current having a second polarity at the first voltage input or a second voltage input of the liquid sensor (15) during the first or a second time period; f) detecting the alternating voltage and / or the alternating current, at least a first half-wave signal value of this voltage and / or current, produced by the method steps c) -e) at the liquid sensor (15), g) comparing at least a first half-wave signal value of a known voltage and / or current with at least the current half-wave signal value of an alternating voltage and / or alternating current at the liquid sensor (15), the method steps b) -g) preferably being carried out periodically and subsequently; h) detection of an indicative information on the liquid sensor (15), wherein the indicative information on the one hand, the detection of a liquid on the liquid sensor (15) and / or on the other hand, the detection of a disturbance, in particular a sensor or line break, the liquid sensor (15).
[2]
2. Measuring method according to claim 1, characterized in that the method steps b) -f) after initial installation for establishing a reference value at least once - possibly several times - are made to determine at least a first half-wave signal value of the known alternating voltage and / or alternating current, wherein preferably the known alternating voltage and / or alternating current value is stored in a nonvolatile value memory unit (25).
[3]
3. A measuring method according to claim 1 or 2, characterized in that after the method step e) the measurement of the second DC voltage and / or the second DC current at the or another output of the liquid sensor (15) after the first or second time period takes place.
[4]
4. Measuring method according to one of claims 1 to 3, characterized in that the method steps b) -g) at the liquid sensor (15) in each case after more than 1 ms, in particular more than 50 ms, preferably every 22 ms done.
[5]
5. Measuring method according to one of claims 1 to 4, characterized in that an alarm signal is triggered if a deviation between the known alternating voltage value and / or alternating current value, at least the first half-wave signal value of this voltage and / or current and the current alternating voltage value and / or alternating current value , at least the first half wave signal value of this voltage and / or current occurs.
[6]
6. Measuring method according to one of the preceding claims, characterized in that the current alternating voltage values and / or alternating current values are stored in a ring memory table (30) or a DC decoupling is provided in the measuring method.
[7]
7. Measuring method according to one of the preceding claims, characterized in that at least a second liquid sensor (15 ') with-optionally-same-known complex resistance value is introduced in a first or second measurement environment.
[8]
8. Measuring method according to one of the preceding claims, characterized in that average values or medians are formed from the respective alternating voltage and / or alternating current values of one or more liquid sensors (15, 15 ') and supplied as a comparison value to an evaluation unit (20), wherein the alternating voltage and / or alternating current values for averaging - are preferably taken from a ring memory table (30) - and wherein in particular the values in the table are sorted by size and only average positions are used for averaging.
[9]
9. Measuring device for a liquid detection system (10), in particular a water alarm system, comprising a) at least one first DC or DC source (11), b) at least one first switching element (12) connected in series with the DC or DC source (11), c) at least one first liquid sensor (15) with a known complex resistance, in particular known complex line resistance (15a) and / or known complex sensor resistance (15b), the liquid sensor (15) being connected in series with the switching element (12), d) At least one first measuring unit (13) for measuring the DC voltage value and / or DC value, characterized in that e) the switching element (12) is designed such that it measures the polarity of the DC voltage and / or the DC current at the first liquid sensor (15) during measuring operation. periodically changes f) between the first liquid sensor (15) and the first measuring unit (13) a first RC element (14) with known ohmic resistance (14a) and known capacitance (14b) is connected, the resistance (14a) of the RC element (14) being parallel to the capacitance (14b) of the RC element ( 14), that g) an evaluation unit (20), which detects the current alternating voltage signal and / or alternating current signal at the first liquid sensor (15) and compares with a predefined AC voltage signal and / or AC signal and depending on the comparison signal indicative information on Liquid sensor (15) can be displayed, wherein the indicative information includes at least on the one hand, the detection of a liquid on the liquid sensor and / or on the other hand, the detection of a disturbance, in particular a sensor or line break, the liquid sensor.
[10]
10. Measuring device according to claim 9, characterized in that a second DC or DC power source (11 ') and / or a second switching element (12') in series with the second DC or DC power source (11 ') is provided and / or that at least a second liquid sensor (15 ') is provided, consisting of a complex resistor, in particular known complex line resistance (15a') and / or known complex sensor resistance (15b '), wherein the second liquid sensor (15') parallel to the first liquid sensor (15) is peeled and / or that a second measuring unit (13 ') for measuring the second DC voltage value and / or DC value is provided and / or that a second RC element (14') with known resistance (14a ') and known capacity (14b' ) is connected in front of the second measuring unit (13 '), wherein the RC element (14') is peeled between the liquid sensors (15, 15 ') and the second measuring unit (13') and / or r that at least one DC decoupling unit (17, 18) between the first RC element (14) and the at least first liquid sensor (15) and / or the second RC element (14 ') and the at least first liquid sensor (15) is provided.
[11]
11. Measuring device according to claim 9 or 10, characterized in that the evaluation unit (20) has a nonvolatile value memory unit (25) and / or an internal alarm signal unit (23) and / or a ring memory table (30) and / or a peak value filter (50) and / or an averaging unit (40) and / or an external alarm unit (26) and / or an external operating unit (60).

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同族专利:

公开号 | 公开日

DE102017210982A1|2018-01-04|

CH712638B1|2020-07-15|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

AT399787B|1992-09-08|1995-07-25|Tartsch Erich|Monitoring unit for monitoring the surroundings of the unit for moisture or dryness|

DE10256064B4|2002-11-30|2004-10-28|GSF - Forschungszentrum für Umwelt und Gesundheit GmbH|Method and device for determining the water content and conductivity in soils and bulk materials|

法律状态:
2020-10-15| PCAR| Change of the address of the representative|Free format text: NEW ADDRESS: ROTENBODENSTRASSE 12, 9497 TRIESENBERG (LI) |

优先权:

申请号 | 申请日 | 专利标题

CH00831/16A|CH712638B1|2016-06-30|2016-06-30|Measuring method and measuring device for a liquid detection system.|CH00831/16A| CH712638B1|2016-06-30|2016-06-30|Measuring method and measuring device for a liquid detection system.|

DE102017210982.3A| DE102017210982A1|2016-06-30|2017-06-28|Measuring method and measuring device for a liquid detection system|

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