DE102015205382A1 - Operating a household appliance - Google Patents

Abstract

A method S0 to S6 is used to operate a household appliance 1, wherein by means of the household appliance 1 a sample is measured S0 and the associated measurement results IR-Sp are analyzed for a presence of biological material S1 to S6. A household appliance 1 is equipped with a measuring device 7, wherein the household appliance 1 is set up to carry out the method S0 to S6. The invention is particularly advantageously applicable to water-conducting household appliances, in particular to laundry care appliances, in particular to dryers.

Description

The invention relates to a method for operating a household appliance, in which a sample is measured by means of the household appliance. The invention also relates to a household appliance with a measuring device for measuring the sample, wherein the household appliance is set up for carrying out the method. The invention is particularly advantageously applicable to water-conducting household appliances, in particular to laundry care appliances, in particular to dryers.

With some household dryers it is possible to carry out hygiene measures to kill bacteria or other microorganisms. The associated measures include an increase of a process temperature to over 60 ° C, as this sets up a denaturation of most protein structures. Also, a region to be disinfected can be irradiated by means of ultraviolet radiation. In addition, a zone to be disinfected can be supplied with ozone.

CN 203159969 U discloses a smart laundry drying cabinet. In this case, a temperature and humidity sensor are arranged in a common cabinet. Information received from the sensor is supplied to a chip with a microcomputer for automatic processing. If humidity in the clothes drying cabinet is below a predetermined set point, the microcomputer will begin to activate infrared disinfection heaters to sanitize, sterilize, reheat, and dehumidify items in the cabinet until the humidity in the cabinet returns above the set point ,

JP 2013-244171 discloses a way to remove clothing attached to bacteria. For this purpose, a clothes dryer has a heating device for heating process air, a moisture detection device and an infrared temperature detection device for detecting the temperature of laundry in a drum of the tumble dryer. By means of a control means for controlling the drying operation, the heater is activated when the humidity drops below a predetermined threshold to raise the process air temperature to a high sterilizing temperature which is higher than a temperature in a drying operation. The temperature of the laundry is monitored by means of the infrared temperature detection device.

EP 0 748 891 A1 discloses a method for temperature compensation of the measured values of a turbidity sensor in an automatic washing machine or dishwasher, which is carried out according to the following scheme: A measuring the turbidity signal, B determining the operating point, C storing the operating point, D measuring the temperature at the turbidity sensor, E calculating the correction value for the determined operating point and the measured temperature, F storing the correction value, and G addition of the correction value to the measured value in order to obtain the compensated turbidity measurement value. The turbidity sensor operates by an optical process and consists of a transmitter (eg, an LED) emitting near infrared light and an optical receiver (phototransistor or photodiode or photoresistor) which converts the infrared optical signal into a proportional electrical signal.

DE 198 58 386 A1 discloses a transmission measuring device for detecting the haze level of a liquor. It comprises a transmitter housing, which is rigidly attached to a tub of a water-bearing household appliance and connected via a Laugendurchlassöffnung with the tub so that upon reaching a predetermined Laugenstands in the tub liquor flows into the encoder housing, and consisting of an optical transmitter and an optical receiver Sensor device which is stationarily arranged on the encoder housing, which falls from the optical transmitter in the encoder housing emitted light through the liquor in the transmitter housing on the optical receiver. The sensor device responds to the turbidity of the liquor in the encoder housing and allows their continuous detection. Particularly advantageous are the optical transmitter designed as an infrared light emitting diode and the optical receiver as a phototransistor. The optical transmitter and the optical receiver are for this purpose connected to a control device known per se, which controls the infrared light emission of the optical transmitter, receives the output signal of the optical receiver and based on a predetermined relationship between the same transmits the measurement, ie, determines the degree of turbidity of the liquor ,

However, the known methods have the disadvantage that they are relatively unreliable use and either too often activated (which costs time and can also stress components) or are not activated frequently enough (which does not sufficiently prevent the emergence of microorganisms).

DE 10 2009 042 418 A1 discloses a method for detecting an imbalance of fermentation in a biogas plant with a fermenter, wherein a first amount of Gram-positive bacteria is determined in at least a part of the fermenter content and is determined from the first amount of Gram-positive bacteria, whether an imbalance of the fermentation is present. It can infrared spectroscopy is used in a sensor array.

It is the object of the present invention to overcome the disadvantages of the prior art at least partially and in particular to provide a more reliable activation of hygiene measures in household appliances than before.

This object is achieved in each case according to the features of the independent claims. Preferred embodiments are in particular the dependent claims, the following description and attached drawing removable.

The object is achieved by a method for operating a household appliance, in which (a) a sample is measured by means of the domestic appliance and (b) a presence of biological material is determined from the associated measurement results.

This provides the advantage that it can be determined very accurately when a hygiene measure of the household appliance should be performed. Because of the method, a load with biological material such as microorganisms (bacteria, fungi, etc.) or pollen, etc. is measured directly and not simply performed at a certain operating parameters such as a temperature, a degree of humidity or an expired operating life, a hygiene measure. This can save energy and / or improve the health and well-being of users. Basically, the presence of biological material can be analyzed both on parts (for example, certain components such as a water sump) and on contents (water, goods to be treated such as laundry, dishes, etc.) of the household appliance.

The household appliance is in particular an electrically operated household appliance. Under a household appliance can be understood in particular a laundry care device or a kitchen appliance. The kitchen appliance can e.g. a cooking appliance, a dishwasher, a refrigerator and / or freezer or a small electrical appliance.

The sample may be a solid, a liquid and / or a gaseous sample. The sample may be a solid part of the household appliance and / or may be removable from the domestic appliance (e.g., process air or condensate).

The method can also be described by examining a sample for the presence of biological material by means of the household appliance. The fact that the presence of biological material is determined from the measurement results can also be described or regarded as an evaluation of the measurement results for the presence of biological material. The determining or evaluating may e.g. a comparison of measurement results with entries of a database (e.g., predetermined data patterns).

The biological material may include microorganisms or else haploids such as pollen etc. In particular, prokaryotes such as bacteria, eukaryotes such as fungi, algae, mites and haploids such as pollen can fall under microorganisms.

It is a development that the sample is measured by contact with at least one measuring means, for example by contact with at least one measuring pin, at least one measuring surface, etc.

It is still a further development that the sample is measured without contact, which allows a particularly low-maintenance measurement. It is also a further development that the sample is measured spectroscopically, which allows a simple implementation and effective evaluation of the measurement.

It is an advantageous embodiment for a detailed measurement and a particularly effective determination or evaluation of the biological material that the sample is measured by infrared spectroscopy. However, in principle, the sample can also be measured by electron beam spectroscopy, radar measurements, luminescence measurements, etc.

The infrared spectroscopic measurement can in particular in the near infrared region (NIR) with a wavelength of the IR light of about 0.8 to 2.5 microns ("near infrared spectroscopy") and / or in the mid-infrared range (MIR) with a wavelength of the IR light be carried out from about 2.5 to 25 microns. In this case, the use of the MIR range is advantageous because it generates sharper bands compared to the NIR range and therefore can be evaluated more easily. However, near-infrared spectroscopy can often be implemented more cheaply.

The result, in particular of a spectroscopic measurement, may be a spectrum over a predetermined measuring range (eg a range of IR wavelengths). For example, when measured in transmission, the spectrum may be an absorption spectrum. The evaluation of the measurement results can then include, for example, determining whether spectra - eg in the form of specific bands or groups of bands - of known biological material are contained in the measured spectrum. The spectra of the known biological material can eg in a database (eg of the household appliance). The evaluation of the measurement results may therefore include, for example, a spectral decomposition, for example by means of a clustering and a factor analysis. Thus, a qualitative statement and - with appropriate resolution of the spectrometer and a mathematically advanced evaluation - also a quantitative statement about these biological materials can be achieved.

The evaluation of the measurement results is easier to carry out for the MIR range than for the NIR range, since the NIR bands are less sharp and pronounced and therefore the assignment for the NIR range requires a more complex mathematics.

The spectra, in particular bands, of known biological materials may, for example, have been obtained by previous calibration measurements on pure biological materials, e.g. on known prokaryotic or eukaryotic microorganisms or on sperm cells such as pollen etc. The calibration measurements thus make it possible to assign characteristic bands in the infrared spectral range to known biological material.

It is yet another embodiment that threshold determination is performed to determine an amount of biological material present in the sample. This quantitative determination may e.g. be used to perform the evaluation particularly effective. Thus, it can be determined by means of this embodiment whether there is even enough biological material in or on the sample that it is worth carrying out further determination or evaluation steps. Namely, the amount of biological material is very low, the burden is therefore very low, so that may possibly even be dispensed with a hygiene measure.

Generally, from the measurement results, a presence of biological material can be quantitatively and / or qualitatively determined or analyzed, i.e., whether and, if so, in what quantity a particular biological material or biological materials are present in the sample.

It is a development that quantitatively determines or analyzes the presence of biological material as a whole or in total from the measurement results, in particular a sum of prokaryotes, eukaryotes and possibly haploids. For example, it may be analyzed whether or not a germ limit corresponding to about 10 ³ colony-forming units has been reached as a threshold value, below which threshold value is spoken of hygienically acceptable water or the like. On a further analysis and / or hygiene measure can then be waived if necessary.

It is a further embodiment that the presence of prokaryotes (e.g., bacteria), eukaryotes (e.g., fungi or mites), and / or haploid cell material (e.g., pollen) is determined from the measurement results (quantitative and / or qualitative). As a result, a load on the biological material can be determined more accurately.

It is a further development of the fact that a quantity of prokaryotes, eukaryotes and / or haploids or of haploid cell material separately is recorded qualitatively and / or quantitatively. Thus, a burden of the biological material can be more accurately determined, namely, broken down to the above biological materials. As a result, hygiene measures can be adapted to one or more of the previously determined types of biological material. Also, for example, allergy sufferers can be displayed a particularly high amount of pollen, etc.

It is yet another embodiment that the associated measurement results are analyzed for the presence of certain prokaryotes, eukaryotes, and / or haploids (e.g., of particular species, strains, etc.). As a result, a burden of these biological materials can be detected even more accurately and actions based thereon can be adapted even more precisely. For example, allergy sufferers may be notified which types of pollen (e.g., birch pollen, grass pollen, etc.) are present in larger quantities. It can also be analyzed for certain particularly disease-promoting bacteria such as E. coli, Legionella, etc.

It is still a development that - especially if previously a sufficiently large amount of bacteria was detected - the measurement results on a presence of gram-positive bacteria and / or gram-negative bacteria is performed.

It is still a development that - especially if previously a sufficiently large amount of gram-positive bacteria and / or gram-negative bacteria was detected - the measurement results on a presence of certain gram-positive bacteria and / or gram-negative bacteria is performed eg to the presence of Gram-negative E. coli bacteria or P. aurigenosa bacteria.

It is a further development that the measurement results are carried out for the presence of different types of pollen (for example birch or grass).

Generally, for a rapid evaluation or determination, a graded evaluation may be made that first determines whether there is any amount of a particular biological material before that biological material is examined or analyzed for the presence of portions thereof. For example, a hierarchical evaluation or "analysis cascade" may include: does the amount of biological material in the sample exceed a predetermined threshold? If so, does the amount of bacteria, fungi or pollen exceed a threshold? If this is the case, for example, for bacteria: Does the amount of gram-positive or gram-negative bacteria exceed a particular threshold? If this is the case, for example, for gram-positive bacteria, does the amount of E. coli bacteria or P. aurigenosa bacteria exceed a respective threshold value? etc. This can, for. B. analogous to pollen and certain types of pollen such as birch, grass, etc. are performed.

It is also an embodiment that is triggered by the household appliance at least one action on the determination of the biological material, in particular a hygiene measure is triggered and / or at least one user message is issued. As a result, a household appliance can be kept hygienic in a particularly user-friendly manner.

A hygiene measure may, in particular, be understood as a sequence (program, operating sequence, operating sequence, etc.), by means of which it is combatted ("disinfection program") and / or by means of which its allergens are combatted ("anti-allergy program"). A hygiene measure can e.g. increase in temperature (e.g., a process temperature or water) to greater than 60 ° C (to denature most protein structures), UV irradiation (e.g., a condensate container), and / or use of ozone.

The at least one action may include automatically triggering and / or adjusting at least one operation, e.g. a triggering of a hygiene program.

The at least one action may alternatively or additionally include outputting at least one user message. The user message may include an optical and / or an audible signal. The optical signal may be displaying a user message on a display device, e.g. in the form of a symbol and / or in plain text (e.g., "attention: high pollen counts"). The optical signal may be formed as a color-coded signal (e.g., similar to a traffic light or "traffic light signal"), e.g. with the colors green ("Hygienic level good") or red ("Start hygienic measure") or with the colors green ("Hygienic level good"), yellow ("Hygienic level is approaching a critical value") or red ("Start hygienic measure")

In general, a hygiene measure can be started automatically by the device. Alternatively or additionally, a hygiene or disinfection procedure can be started by a user, e.g. by activating a corresponding program.

The object is also achieved by a household appliance, which is set up for carrying out the method described above. The household appliance can be designed analogously to the method and has the same advantages.

The domestic appliance has a corresponding measuring device for performing step (a), e.g. a measuring cell.

The measuring device may in particular be an infrared spectroscopic measuring device, in particular an infrared spectroscopic measuring cell. This can for example have at least one infrared (IR) source and at least one IR sensor. The sample to be measured can be arranged in a measuring path between the at least one infrared (IR) source and the at least one IR sensor.

It is a further development that the measuring device has a transmitting arrangement, that is to say that radiation transmitted through the sample is detected. It is another development that the measuring device has a reflecting arrangement, that is to say that radiation reflected by the sample is detected.

It is an embodiment that the measuring device has a flow cell, in particular gas flow cell and / or liquid flow cell. As a result, new liquid and / or gaseous (including vaporous) sample material can be easily introduced into the measuring device and removed again therefrom. The radiation source and the radiation detector can be arranged outside the measuring cell and couple radiation into the measuring cell through at least one window or measure radiation exiting through the window.

It is still an embodiment that the household appliance has an evaluation or analysis device coupled to the measuring device for determining or determining a presence of biological material in the sample from the measured values supplied by the measuring device. The analysis device can, for example, in the presence of a measurement spectrum to be set up to identify in the range of measurement for certain biological material (for microorganisms such as fungi or bacteria or for allergens such as pollen, etc.) characteristic proportions and possibly quantify.

It is a further embodiment that the household appliance itself has no evaluation unit, but is set up to communicate with an external analysis device. In particular, the domestic appliance can be set up to send measured values of the measuring device to an external analysis device and to receive data analyzed by the analysis device. The communicating may e.g. over a network like an intranet or the internet. The external analyzer may e.g. a server on which a corresponding analysis program can run. The server can e.g. be present in a domain that is assigned to a manufacturer of the household appliance. The household appliance may have a communication device that can in particular send and receive data bidirectionally. The communication device may be wired (e.g., having an Ethernet interface) or wireless (e.g., having a telephone connection, a WLAN connection, etc.).

It is a development that the household appliance has at least one display device for displaying a result of determining the presence of the biological material. The at least one display device can have at least one screen (also non-contact screen), at least one segment display, at least one small lamp (also several lamps with, for example, different colors), etc.

It is also an embodiment that the household appliance is a laundry care device, in particular a laundry drying device. The determination or detection of a presence of biological material is particularly advantageous because in a laundry dryer often condensate or condensation occurs, in which, if necessary, multiply microorganisms or allergens, etc. can collect. By means of the laundry care device according to the invention, it can be prevented, for example, that the microorganisms, allergens, etc. reach the laundry to be treated.

The clothes dryer may be a stand-alone tumble dryer or a washer / dryer combination machine ("washer-dryer"). The laundry drying apparatus may include a heat pump, such as a compressor heat pump. The laundry dryer may be an exhaust air dryer with an open process air duct or a circulating air laundry dryer with a circulating closed process air duct.

However, the invention is also particularly advantageously applicable to other household appliances which carry water, e.g. on washing machines, dishwashers etc.

It is also an embodiment that the measuring device for measuring water (in particular condensate or condensate water) is set up as the sample or as sample material. This provides the advantage that such a potential reservoir for microorganisms, allergens, etc., can be monitored, allowing a particularly hygienic device.

It is also an embodiment that the measuring device for measuring condensate from a condensate receiver (which can also be designated as a condensate tank) is set up. This is particularly advantageous, since microorganisms can form in a condensate receptacle particularly fast and / or allergens can settle. Also, there can form biological film there. A monitoring of the water from a condensate so allows the monitoring of a particularly critical point of the household appliance. In particular, in a tumble dryer, the water from the condensate receiver is suitable as a convenient indicator of hygiene detection for the laundry being dried and for any stagnant water present prior to a drying process (i.e., also as an indicator of the hygienic condition of the laundry dryer).

It is a further development that the condensate receiver is a collecting tray for collecting or receiving water - in particular condensate - which originates from a heat exchanger, e.g. for receiving water condensing on the heat exchanger and then dripping down and / or rinsing water applied to the heat exchanger.

It is also a development that the condensate receiver is a rinsing container for receiving rinse water - in particular condensate - from which the rinse water can be drained device-controlled for rinsing one or more components of the household appliance.

It is still a further development that the measuring device is set up for measuring process air as the sample or as sample material.

It is also an embodiment that the measuring device is arranged in a bypass channel. This bypass channel branches off a main channel or runs parallel to a main channel in which the material of the sample flows. This results in the advantage that the sample material can reach the measuring device, in particular a measuring cell, in a particularly simple manner.

The main channel may e.g. be a process air duct or a water pipe. The water pipe may be a downpipe, in which water, in particular condensate, coming from a rinsing tank impulse or surge is discharged to a heat exchanger.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in conjunction with the drawings.

1 shows in a view obliquely from the front a sketch of a clothes dryer with selected components; and

2 shows a hierarchical evaluation or analysis structure

1 shows a sketch of a clothes dryer according to the invention 1 , This has a horizontally rotatable laundry drum 2 for receiving laundry to be dried. The moisture released during a drying process from the laundry to be dried (not shown) is typically condensed out of warm process air (for example on a heat sink, not shown here) and then enters a collecting container 3 , the z. B. is designed in the form of a collecting tray. The then dryer process air is then heated in the presence of a circulating air dryer (eg by means of a heater not shown here) and fed back into the laundry drum. The heat sink and the heater can be heat exchangers and represent, for example, parts of a heat pump.

The in the container 3 collected condensate can through a riser 4 in a condensate tank 5 be pumped (eg by means of a pump not shown here). The condensate tank 5 can be removed and emptied by a user. The condensate tank 5 but can also serve as a rinse tank by during an operation of the tumble dryer 1 that in the condensate tank 5 condensate through a downpipe 6 impulsive or bubbly, for example, on the heat sink for its purification. The drained condensate is again from the collecting container 3 collected.

In the riser 4 is a measuring device in the form of an infrared spectrometer 7 with a collecting chamber or measuring cell 8th for the sample condensate pumped up from the receiver, with an IR light source 9 (eg for the emission of NIR or MIR light) and an IR detector 10 on the other side of the measuring cell in the beam direction of an IR light source 9 , The infrared spectrometer 7 So it works in a transmission mode. In particular, it may be a microspectrometer to save installation space. At the IR detector 10 An IR absorption spectrum is recorded that is transmitted over a data line 11 (eg via a fiber optic cable) to an evaluation device 12 is transmitted. The evaluation device 12 may be an independent device (eg electronics) or, for example, functionally in a central control device of the tumble dryer 1 be integrated. In the evaluation device 12 For example, the measured IR absorption spectrum is qualitatively and possibly also quantitatively analyzed for the presence of biological material, for example by spectral decomposition, clustering, factor analysis, pattern analysis, etc., as in the following 2 is shown in more detail.

The evaluation device 12 may also start at least one hygienic procedure and / or issue a user advice. The user information can, for example via a conventional two-and / or display element such as a display 13 (eg a segment display, an LCD or a touch screen) and / or a traffic light display 14 with here three lights of the colors green 14a , yellow 14b and red 14c ,

Alternatively or additionally, a measuring device also on the downpipe 6 be arranged.

2 shows a section of a hierarchical evaluation tree or analysis cascade in the evaluation 12 can be implemented.

From the measurement of the sample made in a step S0, an IR absorption spectrum IR-Sp is obtained. This is followed by an analysis of the associated IR absorption spectrum IR-Sp on a presence of biological material, as will be explained in more detail below.

On a top level L1, the measured IR absorption spectrum IR-Sp is first of all examined in a first step S1 as to whether the biological material in the sample as a whole reaches a threshold value of 10 ³ colony-forming units (the so-called "germ limit"). If not ("N"), in a step Sa, an action can be triggered such that, for example, the green light 14a the traffic light display 14 is lit to indicate hygienically safe water. On a hygiene measure can be dispensed with. On the other hand, if the germinal limit is exceeded ("J"), at a second stage L2 becomes biological Material analyzed or evaluated in more detail, namely on the presence of bacteria in step S2, mushrooms in step S3 and pollen in step S4. If a respective concentration threshold of these biological materials (zBiHv 780 to 1500 cm ^-3 ) is not reached, may be issued a note (eg in the traffic light display 14 by activating the yellow light 14b ), but no hygiene measure automatically through the tumble dryer 1 carried out.

If it emerges from the analysis in step S2 that the bacterial germ limit is exceeded, as is shown here, the IR absorption spectrum IR-Sp is examined in a next lower stage L3 as to whether a germ limit for gram-negative bacteria is exceeded (step S5) or whether a germination limit for gram-positive bacteria has been exceeded (step S6). Depending on the result, even more accurate evaluations can be carried out, as also indicated by the steps L4 to L6 and / or corresponding instructions and / or hygiene measures are triggered.

Of course, the present invention is not limited to the embodiment shown. Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., unless this is explicitly excluded, e.g. by the expression "exactly one", etc. Also, a number can include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

LIST OF REFERENCE NUMBERS

1

 clothes dryer

2

 washing drum

3

 receptacle

4

 riser

5

 condensate tank

6

 downspout

7

 infrared spectrometer

8th

 cell

9

 IR light source

10

 IR detector

11

 data line

12

 evaluation

13

 display

14

 Traffic Light

14a

 Green light

14b

 Yellow light

14c

 Red light

S0

 measuring step

S1-S6

 analysis steps

Sat.

 action step

L1-L5

 analysis stages

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 203159969 U [0003]
• JP 2013-244171 [0004]
• EP 0748891 A1 [0005]
• DE 19858386 A1 [0006]
• DE 102009042418 A1 [0008]

Claims (14)

Method (S0 to S6) for operating a household appliance ( 1 ), in which - by means of the household appliance ( 1 ) a sample is measured (S0) and - the associated measurement results (IR-Sp) are analyzed for the presence of biological material (S1 to S6). Method (S0 to S6) according to claim 1, wherein the sample is measured by infrared spectroscopy (S0). Method (S0 to S6) according to one of the preceding claims, in which a threshold value determination (S1) is carried out for determining an amount of biological material present in the sample. Method (S0 to S6) according to one of the preceding claims, in which the presence of prokaryotes (S3), eukaryotes (S2) and / or haploid cell material (S4) is determined from the measurement results. Method (S0 to S6) according to claim 4, in which the associated measurement results are analyzed for the presence of certain prokaryotes, eukaryotes and / or haploids. Method (S0 to S6) according to one of the preceding claims, in which at least one action is triggered by the domestic appliance upon the determination of the biological material (Sa). Household appliance ( 1 ) with a measuring device ( 7 ), the domestic appliance ( 1 ) is arranged to carry out the method (S0 to S6) according to one of the preceding claims. Household appliance ( 1 ) according to claim 7, wherein the household appliance ( 1 ) an infrared spectroscopic measuring device ( 7 ) for measuring a sample. Household appliance ( 1 ) according to one of the preceding claims, in which the measuring device ( 7 ) a flow cell ( 8th ), in particular gas flow cell and / or liquid flow cell. Household appliance ( 1 ) according to one of claims 8 to 9, comprising one with the measuring device ( 7 ) coupled analysis device ( 12 ) for detecting a presence of biological material (S1 to S5) in the sample from the measuring device ( 7 ) supplied measured values (IR-Sp). Household appliance ( 1 ) according to one of claims 8 to 10, wherein the domestic appliance ( 1 ) for transmitting measured values (IR-Sp) of the measuring device ( 7 ) to an external analyzer and for receiving data analyzed by the analyzer. Household appliance ( 1 ) according to one of claims 8 to 11, wherein the domestic appliance ( 1 ) is a laundry care device, in particular a clothes dryer, is. Household appliance ( 1 ) according to claim 12, wherein the laundry care device is a laundry drying device and the measuring device ( 7 ) for measuring condensate water from a condensate receiver ( 3 . 5 ) is set up. Household appliance ( 1 ) according to claims 9 and 13, wherein the measuring device ( 7 ) is arranged in a bypass channel.

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