DE102017113371A1 - Cooking appliance with cooking chamber and method for cleaning the cooking appliance - Google Patents

Abstract

The invention relates to a cooking appliance (10) comprising a cooking chamber (12) and a line (14) connected in flow with the cooking chamber (12). In line (14) a wash liquor with detergent (18) is guided. Alternatively or additionally, the cooking appliance (10) may comprise a wash liquor reservoir (20) which is fluidly connected to the cooking space (12) and in which a wash liquor with cleaning agent (18) may be contained. On the line (14) and / or on the wash liquor reservoir (20) is arranged a measuring device (34, 36) for irradiating electromagnetic radiation into the wash liquor and for detecting a light emission excited by the electromagnetic radiation in the wash liquor. The method for cleaning the cooking appliance (10) comprises the use of a cleaning agent (18) containing one or more luminescent dyes.

Description

The present invention relates to a cooking appliance with a cooking chamber and a method for cleaning the cooking appliance.

Food cooking appliances for professional applications such as restaurant or canteen kitchens are well known. In these devices, steam is generated, so that the food can be cooked preferably without pressure within a cooking chamber. However, when cooking the food, the steam used inevitably absorbs other solid, liquid and / or gaseous portions in different concentrations. These parts come in particular from the food to be cooked and can settle in the cooking chamber and on the components of the cooking appliance.

From the DE 198 38 864 C2 a method for cleaning a cooking appliance is known, in which at least one spray nozzle is arranged in the cooking chamber and cyclically driven there in a rotational movement through the cooking chamber. This method enables an automated execution of a cleaning program in which several treatment steps can be carried out successively. The treatment steps may include steaming the cooking chamber, introducing a cleaner, decalcifying the cooking appliance, rinsing a rinse step and / or drying the cooking chamber, in particular with hot air.

Different cleaning agents can be used for each treatment step. The cleaning agents can be used in solid or liquid form, or in the form of a gel, a paste or a sol. The WO 03/073002 A describes a detergent in the form of a multiphase tablet comprising at least one cleaning phase, a final rinse phase and / or a descaling phase. It is also known to carry out the steps of descaling and rinsing simultaneously after the cleaning phase. The EP 2 221 357 A1 describes a combined decalcifier and rinse aid for use in devices and systems with metallic, ceramic, glass or plastic surfaces, in particular for steam generation or heat treatment of food.

To distinguish the various cleaning agents and to avoid confusion by the user, the cleaning agents may be colored with different dyes. The coloring of the cleaning agents with dyes, however, can not provide sufficient copy protection. However, use of cleaning agents not recommended by the manufacturer of the cooking equipment may result in undesirable damage to cooking device components such as gaskets and hose connections, as well as premature wear due to corrosion of metal surfaces.

In the field of process analysis, it is known to monitor liquid and solid media spectroscopically. The DE 100 53 864 A1 shows, for example, a method for determining the qualitative and quantitative content of polyaspartic acid in aqueous formulations and liquid media by means of fluorescence spectroscopy. The DE 10 2006 035 996 A1 describes an optical measuring probe for process monitoring with a photoconductive connection between the arranged in a process device end and the coupled to a spectrometer opposite end.

The object of the invention is to provide a cooking appliance with a cooking chamber and a method for cleaning the cooking chamber and other components of the cooking appliance, which allows automated detection of the detergent used and faulty applications with little effort.

This object is achieved by a cooking appliance with a cooking chamber according to claim 1.

Preferred embodiments of the invention are specified in the subclaims, which can optionally be combined with one another.

The cooking appliance according to the invention comprises a cooking chamber and a line connected in flow with the cooking chamber. In the line a wash liquor can be run with detergent. Alternatively or additionally, the cooking appliance comprises a washing liquor reservoir which is connected in terms of flow with the cooking space and in which a washing liquor with cleaning agent can be contained. According to the invention, a measuring device for irradiating electromagnetic radiation into the wash liquor and for detecting a light emission excited by the electromagnetic radiation in the wash liquor is arranged on the line and / or on the wash liquor reservoir.

The invention furthermore relates to a method for cleaning the cooking appliance, the method comprising a treatment step in which at least one wash liquor is provided with cleaning agent and the cooking cavity is brought into contact with the wash liquor. The method is characterized in that the at least one cleaning agent contains one or more luminescent dyes, wherein the luminescent dye by irradiation of electromagnetic radiation is excited and generates a light emission, and wherein the light emission is detected.

The cooking appliance according to the invention and the method according to the invention thus offer the possibility of automated checking of the use of the detergent recommended by the manufacturer. Only these detergents show when irradiated by light into the wash liquor and / or the reservoir for the detergent in the cooking appliance, the accepted by the device emission wavelength. If the light emission at this wavelength is absent or inconsistent with the expected light emission, the cooking appliance may, in response to this determination, wash out the detergents and / or log or display an error message.

In addition, when using non-recommended cleaning agents, the cooking appliance may even automatically stop performing the cleaning program. Similar operations may be performed if the user uses manufacturer-approved detergents but confuses, for example, cleaners and descaler.

Other features and advantages of the invention will become apparent from the following description of preferred embodiments, which, however, should not be taken in a limiting sense.

The cooking appliance used in the method according to the invention is preferably a steamer or a combination steamer for the preparation of food, particularly preferably a cooking appliance for non-pressure steaming of food.

As a cooking chamber in the context of the invention is understood by side plates, floor panels and ceiling panels and a cooking chamber door or a cooking compartment lid and used for cooking the food space of the cooking appliance, including the devices contained therein such as food containers, baffles, suspension devices and Einschubleisten for food containers, oven rack , Crockery, cutlery and / or other accessories, as well as possibly connected and fluidly connected to the cooking compartment components such as drain and condenser. Cooking chamber surfaces are the wall surfaces of the cooking chamber and the surfaces of the devices contained in the oven.

The term "luminescent dye" is understood to mean a chemical compound which absorbs electromagnetic radiation (light) with a wavelength in the UV / VIS range and is thereby put into an excited state. From the excited state, the chemical compound emits light of a different wavelength. The light emission is called fluorescence if the emission occurs immediately after the excitation. A phosphorescence is present when there is a long afterglow of at least one thousandth of a second after the excitation.

According to a first embodiment, the measuring device is designed to excite luminescence, in particular fluorescence or phosphorescence, in the wash liquor and to detect the luminescence light emitted from the wash liquor. The measuring device preferably comprises a light source, in particular for generating light in the UV / VIS range, and an optical sensor as a detector unit for detecting the light emitted from the wash liquor, for example a phototransistor. As a light source, for example, a UV / VIS LED can be used. Light source and detector unit may be included together in a measuring head. The light source can generate light of a specific wavelength, with a defined wavelength range or broadband light, in particular white light.

Preferably, the measuring device is designed to detect a laser-induced fluorescence. For this purpose, the measuring device may in particular comprise a laser or a laser diode as the light source.

The cooking appliance may further comprise a reservoir for detergent and / or a wash liquor reservoir in which a ready-to-use detergent can be added or the detergent contacted with water and can be provided to form the wash liquor. Preferably, a further measuring device for detecting the light emission at the wash liquor reservoir and / or arranged on the reservoir for the cleaning agent.

If the cooking device has a wash liquor reservoir, the measuring device for detecting the light emission can also be arranged only at the wash liquor reservoir instead of an arrangement of the measuring device at the line fluidly connected to the cooking space.

The invention therefore also relates to a cooking appliance having a cooking chamber and a washing liquor reservoir connected in flow with the cooking space, in which a washing liquor may be contained with cleaning agent, and which is characterized in that at the wash liquor reservoir a measuring device for irradiating electromagnetic radiation into the wash liquor and for detecting a light emission excited by the electromagnetic radiation in the wash liquor.

Particularly preferably, the light emission is detected with the measuring device in a wash liquor reservoir and in a line in which the wash liquor is circulated and / or fed to the cooking space. The pipe can be a pipe or a hose pipe. By adding a luminescent dye to the formulation of a cleaning agent can be determined in this way, if the recommended by the manufacturer detergent was introduced into the cooking appliance and / or is present in the wash liquor.

Since the emission wavelength of the luminescent dye is a substance constant, no complete emission spectrum has to be recorded. Rather, it can be measured at single, fixed wavelengths, so that even cheap UV LEDs can be used to excite the luminescent dye and phototransistors for detecting the fluorescence or phosphorescence. By a combination of different luminescent dyes it is also possible to differentiate between different cleaning agents and / or to increase the security against counterfeiting.

The device for measuring the light emission is preferably connected to an evaluation unit which is able to compare the light emission detected by the measuring device with a light emission expected for a cleaning agent, which is predetermined for the execution of a specific cleaning program by the manufacturer of the cooking appliance.

The evaluation unit can be connected to a controller which triggers a predetermined reaction of the cooking appliance in the event of a mismatch of the detected light emission with the expected light emission, in particular the display and / or logging of an error message, the washing out of the cleaning agent from the cooking appliance and / or the Termination of the cleaning process.

The evaluation unit can also be designed to determine a time-resolved laser-induced fluorescence. This allows the measurement of complex chemical parameters in the wash liquor. For example, the evaluation unit can be designed to measure the concentration of the cleaning agent in the wash liquor, since the intensity of the light emission of the luminescent dye contained in the cleaning agent is concentration-dependent. Thus, depending on the determined concentration, an underdosing or overdosing of cleaning agent can also be detected by the evaluation unit and displayed to the user. In the case of an underdosing, the controller connected to the evaluation unit can carry out an independent subsequent dosing of cleaning agent from the cleaning agent supply present in the device, or prompt the user to add further cleaning agent.

According to a further embodiment, the cooking chamber can have a drain for the wash liquor, and a further measuring device for detecting a light emission can be arranged on the drain. With the help of the further measuring device arranged at the outlet, it can be checked whether the cleaning agent was completely rinsed out of the cooking chamber at the end of a cleaning treatment. For this purpose, the light emission can be measured in the washing liquor discharged at the end of the cleaning treatment via the outlet from the cooking chamber and determine whether the wash liquor is free of cleaning agent and therefore no longer shows any light emission.

If a plurality of cleaning agents with different compositions are used in a cleaning program, each containing one or more mutually different luminescent dyes, the evaluation unit can assign the light emission of the luminescent dyes detected by the measuring device in the wash liquor to the different compositions. This also makes a distinction between different cleaning agents possible, for example between compositions for cleaning, descaling and / or softening. Furthermore, the evaluation unit can detect the cleaning agent currently required for the respective treatment step, and the controller connected to the evaluation unit can trigger a reaction of the cooking appliance in the case of incorrect dosages, for example, display an error message.

• - Bedämpfen des Garraums mit Wasserdampf;
• - Behandeln des Garraums mit einem Vorspülmittel, insbesondere Wasser;
• - Behandeln des Garraums mit einem Reiniger;
• - Behandeln des Garraums mit einem Entkalker;
• - Behandeln des Garraums mit einem Klarspüler;
• - Behandeln des Garraums mit einem Nachreinigungsmittel, insbesondere Wasser; und
• - Trocknen des Garraums durch Behandeln mit Warmluft.

The method for cleaning the cooking appliance can, as known from the prior art, be carried out in several successive steps, which can also run automatically. In particular, the purification process may comprise one or more of the following treatment steps:

• - Steaming the cooking chamber with water vapor;
• - Treating the cooking chamber with a pre-rinse, especially water;
• - treating the cooking chamber with a cleaner;
• - treating the cooking chamber with a descaler;
• - treating the cooking chamber with a rinse aid;
• - Treating the cooking chamber with a Nachreinigungsmittel, especially water; and
• - Drying of the cooking chamber by treatment with hot air.

Individual treatment steps can also be omitted or repeated if necessary, or combined into a single treatment step. The order of the treatment steps is variable. For example, the treatment of the oven with rinse aid can be carried out both before and after descaling. Rinse and descaling can advantageously also be combined into a single treatment step. The various treatment variants are known in the art and are selected depending on the desired cleaning program, the cleaning agents used and the degree of contamination of the cooking appliance and / or set by the operator.

Detergents may be used with the compositions known in the art for carrying out the cleaning process according to the invention. The term "cleaning agent" is here and below summarized the group of cleaners, decalcifier, softener and rinse aid.

The detergents may be formulated in any known form, and in particular in solid, liquid or highly viscous form, for example as gel, paste or sol. Preferably, one or more cleaning agents are used in the form of solid cleaning rod. Further preferred are liquid detergents in the form of concentrates or in the form of ready-to-use detergents.

The composition of the cleaning agents is adapted to the respective desired treatment step. The cleaning agents can also be formulated in multi-phase, so that only one detergent must be used to perform several treatment steps.

The cleaners used are preferably compositions based on surfactants and mixtures of surfactants, in particular nonionic surfactants, anionic surfactants, cationic surfactants and / or amphoteric surfactants and mixtures thereof. In the cleaner, the surfactant components are usually present as the main component. Preferably, the cleaner is made alkaline. In addition, the cleaners may still contain enzymes for digesting carbohydrate, fatty or proteinaceous contaminants.

Rinse aids and / or descaling agents preferably contain fruit acids and phosphonates such as citric acid, malic acid, tartaric acid and 1-hydroxyethane-1,1-diphosphonic acid (HEDP). Also suitable are carboxylic acids such as fumaric acid, maleic acid, glycolic acid, acetic acid, oxalic acid, malonic acid, succinic acid, lactic acid, glutaric acid and adipic acid and mixtures thereof.

Suitable decalcifiers or softeners are also amidosulfonic acid, sodium hydrogen sulfate, salts of dihydrogen phosphate and hydrogen phosphate, phosphoric acid and boric acid and mixtures thereof.

A post-purification can be carried out, for example, with hot or cold water. The drying of the cooking chamber can be done by treating the cooking chamber with hot air with the blower.

According to the invention, it is provided that in at least one treatment step, a cleaning agent is used which contains a luminescent dye. The cleaning agent is thus preferably used for the treatment of the cooking chamber with a cleaner, decalcifier and / or rinse aid.

Preferably, the luminescent dye is a phosphorescent or fluorescent dye. Particularly preferably, the luminescent dye emits light of a wavelength in the UV / VIS range, more preferably light of a wavelength in the range of about 200 nm to 1100 nm, preferably 200 nm to 700 nm.

The excitation of the luminescent dye can take place in the same wavelength range. However, the radiation emitted by the luminescent dye is always lower in energy than the radiation used to excite the luminescent dye. For example, fluorescein shows an emission maximum at 514 nm and an absorption maximum at 480 nm.

The luminescent dye is preferably selected from the group of coumarin dyes, cyanines, flavins, luciferins, phycobilins, rhodamines, safranins and xanthene dyes. Preferably, a luminescent dye with harmless toxicity such as eosin or uranine is used. Suitable luminescent dyes are commercially available.

The luminescent dye is present in the cleaning agent in an amount which enables spectroscopic detection in the cleaning agent and / or in the wash liquor formed by incorporation of the cleaning agent in water. The cleaning agent may contain the luminescent dye in a proportion of 0.001 to 10 wt .-%, preferably from 0.01 to 5 wt .-% and particularly preferably from 0.1 to 2 wt .-%.

• - 1 eine schematische Darstellung eines erfindungsgemäßen Gargerätes; und
• - 2 schematisch eine an einem Rohleitungsabschnitt angeordnete Vorrichtung zur Lumineszenzmessung.

The invention will be further described with reference to an embodiment which is described in the attached drawing is shown. In the drawing show:

• - 1 a schematic representation of a cooking appliance according to the invention; and
• - 2 schematically a arranged on a Rohleitungsabschnitt device for luminescence.

This in 1 shown cooking appliance 10 includes a cooking space 12 as well as a flow with the cooking chamber 12 connected line 14 , which may be formed as a pipe or hose line. On the cooking appliance is a storage container 16 arranged in which a cleaning agent 18 , here in the form of cleaning rod, is added. The cleaning agent may also be provided in other forms, for example as a liquid concentrate or ready-to-use liquid cleaner. It is also possible to provide a plurality of storage containers for holding various cleaning agents in solid or liquid form, for example for receiving descalers or softeners and rinse aid. The storage tank 16 is associated with a wash liquor reservoir 20 , in which the cleaning agent 18 can be introduced before or during the execution of a cleaning program. In the wash liquor reservoir 20 can the detergent 18 taken up in water and provided to form the wash liquor.

Alternatively, it is possible that the cleaning agent 18 introduced directly into the oven and there optionally contacted with water and is provided to form the wash liquor.

In the line 14 is a circulation pump 22 arranged, with which the wash liquor from the Wachflottenreservoir 20 deducted and the cooking space 12 is supplied. At the oven 12 is also a drain line 24 provided, via which the wash liquor from the oven 12 removed and a collection container (not shown) or a water treatment plant can be supplied. In the line 14 or the drain line 24 arranged valves 26 . 28 . 30 allow control of the flow of the wash liquor by the cooking appliance 10 , About a bypass 32 Can the cooking space 12 leading line 14 directly with the drain line 24 be connected, or it may be from the oven 12 draining wash liquor into the line 14 returned and again the cooking space 12 be supplied. Other arrangements of the pumps and valves are conceivable and known in the art. For example, in the line 14 at the wash liquor reservoir 20 a drain pump (not shown) may be provided for the purpose of emptying the wash liquor reservoir 20 serves, and the circulation pump 22 can in the pipe 32 be provided.

On the line 14 is at least one measuring device according to the invention 34 for irradiating electromagnetic radiation into the wash liquor and for detecting a light emission excited by the electromagnetic radiation in the wash liquor. The measuring device 34 may be downstream and / or upstream of the recirculation pump 22 be arranged.

If the cooking appliance 10 a wash liquor reservoir 20 contains, can be another measuring device 36 also directly at the wash liquor reservoir 20 be arranged. In this case, the measuring device 34 on the line 14 omitted, or it can be both on the line 14 as well as at the wash liquor reservoir 20 arranged measuring devices 34 . 36 be provided.

Other measuring devices 38 . 40 for detecting a light emission can directly on the reservoir 16 and / or at the drain line 24 be arranged.

The measuring devices 34 . 36 . 38 . 40 are with an evaluation unit 42 connected, which receives the outgoing signals from the measuring devices and converts them into measured values. The evaluation unit 42 is also in a controller 44 embedded, with which the execution of the cleaning process can be controlled in dependence on the measured values, by the evaluation unit 42 be determined.

The arrangement of the measuring device 34 on the line 14 is in 2 shown in detail. The measuring devices 36 . 38 . 40 at the wash liquor reservoir 20 as well as at the storage container 16 and at the drain line 24 are structured accordingly.

The measuring device 34 is along the perimeter of the pipe 14 arranged. It can be along the perimeter of the pipe 14 also several measuring devices 34 be arranged. The measuring device 34 has a light source 46 and a detector unit 48 on. The light source 46 can be designed as a UV / VIS LED or as a laser. The detector unit 48 serves to detect the luminescence and may be formed as a phototransistor.

Into the line 14 is a line section made of a translucent material, preferably quartz glass 50 used. The light source 46 is outside on the transparent line section 50 placed. The inner surface of the transparent pipe section 50 can be provided with a dirt-repellent layer. The transparent line section 50 can also be formed as an optical window that is in the lead 14 is admitted. The light source 46 and / or the detector unit 48 can alternatively also in one Through opening in the line 14 let in and communicate directly with the wash liquor. The light source is preferred 46 and the detector unit 48 contained in a common measuring head.

By means of the light source 46 a light, preferably laser light, is emitted in the UV / VIS range. The light source 46 the light couples through the wall of the pipe section 50 through into the wash liquor. This light excites in the wash liquor a light emission of the cleaning agent 18 contained Lumineszenzfarbstoffs. The light emitted by the wash liquor passes through the wall of the pipe section 50 through the detector unit 48 and comes with the detector unit 48 detected.

In the with the measuring device 34 connected evaluation unit 42 Then, an assignment of the detected light emission to the expected for the respective treatment step detergent 18 , Furthermore, the flow rate of the wash liquor in the line 14 and / or the concentration of the cleaning agent 18 be measured. This makes it possible to determine the exact detergent dosage and / or to control the duration of the respective treatment step. In case of incorrect dosage or if a faulty cleaning agent is used 18 can the cleaning program by the with the evaluation unit 42 connected control 44 aborted and / or an error message is displayed and logged

The evaluation unit 42 can be designed to measure the laser-induced, in particular the time-resolved laser-induced fluorescence in the wash liquor. This allows a variety of different detergents 18 undoubtedly different from each other. Unknown detergents that do not comply with the manufacturer's recommendations can be removed from the cooking appliance in this manner 10 be automatically recognized and rejected.

To carry out the cleaning process, the detergent containing the luminescent dye 18 in the reservoir 16 brought in. After the start of a cleaning program by the user becomes the cleaning agent 18 in the wash liquor reservoir 20 transferred, optionally contacted with water and as a cleaning agent 18 provided with the luminescent dye-containing wash liquor. The wash liquor is the cooking space 12 on the to the wash liquor reservoir 20 connected and fluidly with the cooking chamber 12 connected line 14 fed. The at the wash liquor reservoir 20 and / or on the line 14 arranged measuring device 34 . 36 allows early identification of the type and dosage of the detergent 18 in the wash liquor.

With the help of the circulation pump 22 Can the wash liquor with the detergent 18 are circulated several times in the cooking appliance until the proportion of impurities contained in the wash liquor is high enough and the wash liquor from the cooking appliance 10 is dissipated. The circulation pump 22 can also be used to recirculate the wash liquor in the cooking appliance 10 serve, if no wash liquor reservoir 20 is present and the cleaning agent 18 before starting the cleaning program directly into the oven 10 is introduced.

The further course of the cleaning program can over that in the cooking appliance 10 existing control 44 be affected with the one or more measuring devices 34 . 36 . 38 . 40 connected is. For example, the execution of the cleaning program can be stopped if that on the reservoir 16 arranged measuring device 38 determines that a wrong cleaning agent 18 was filled, or if the on the line 14 arranged device 34 determines that no luminescent dye is contained in the wash liquor. The control 44 can also be in the line 14 arranged valves 26 . 28 . 30 Press, on the one derivative of the wash liquor on the bypass 32 into the drainage line 24 can be done. In this way, the cleaning agent 18 from the device 10 be rinsed out.

Incidentally, in order to carry out the cleaning method, it is possible to resort to the rinsing and spraying devices known in the prior art, which are already used for the conventional automated cleaning methods. In particular, the wash liquor may be one in the cooking chamber 12 arranged spray nozzle, which cyclically in a rotational movement through the cooking chamber 12 can be driven. This allows an automated execution of a cleaning program with several cleaning steps.

The in the oven 12 sprayed wash liquor is at the end of the treatment step on the drain line 24 from the oven 12 removed and fed to a collection or a water treatment plant. With the help of the measuring device 40 can be determined if the from the oven 12 effluent wash solutions are free of luminescent. In this way it can be ensured that the cleaning agent containing the luminescent dye 18 completely out of the oven 12 is washed out.

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

• DE 19838864 C2 [0003]
• WO 03/073002 A [0004]
• EP 2221357 A1 [0004]
• DE 10053864 A1 [0006]
• DE 102006035996 A1 [0006]

Claims (17)

Cooking appliance (10) having a cooking chamber (12) and a fluidly connected to the cooking chamber (12) line (14) in which a wash liquor with detergent (18) can be performed, and / or with a Waschflottenreservoir (20), in the a wash liquor with cleaning agent (18) may be contained, characterized in that on the line (14) and / or on the wash liquor reservoir (20) comprises a measuring device (34, 36) for irradiating electromagnetic radiation into the wash liquor and for detecting a the electromagnetic radiation is arranged in the wash liquor excited light emission. Cooking appliance (10) after Claim 1 , characterized in that the measuring device (34, 36) for excitation and detection of a light emission is formed by luminescence, preferably for detecting a laser-induced fluorescence. Cooking appliance (10) after Claim 1 or 2 , characterized in that the measuring device (34, 36) at least one light source (46), preferably a laser diode, and an optical sensor as a detector unit (48). Cooking appliance (10) according to one of the preceding claims, characterized in that the cooking appliance (10) comprises a reservoir (16) for the cleaning agent (18), and in that on the reservoir (16) has a further measuring device (38) for detecting a light emission is arranged by irradiating light into the reservoir (16). Cooking appliance (10) according to one of the preceding claims, characterized in that the cooking appliance (10) comprises the conduit (14) and the washing liquor reservoir (20), and the measuring device (38) directly on the washing liquor reservoir (20) but not on the line (14) is arranged. Cooking appliance (10) according to one of Claims 1 to 4 , characterized in that the cooking appliance (10) comprises the conduit (14) and the washing liquor reservoir (20), and that a measuring device (34, 36) is arranged both at the wash liquor reservoir (20) and at the conduit (14). Cooking appliance (10) according to one of the preceding claims, characterized in that the cooking appliance (10) has an evaluation unit (42) connected to the measuring device (34, 36), and the evaluation unit (42) that is controlled by the measuring device (34, 36). recorded light emission with an expected light emission compares. Cooking appliance (10) after Claim 7 , characterized in that the cooking device (10) comprises a controller (44) connected to the evaluation unit (42), and the controller (44) triggers a reaction of the cooking appliance (10) in the event of a mismatch of the detected light emission with the expected light emission a reaction selected from washing out the cleaning agents (18), displaying and / or logging an error message, or canceling a cleaning program. Cooking appliance (10) according to one of Claims 7 or 8th , characterized in that the evaluation unit (42) is designed to determine a concentration of the cleaning agent (18) in the wash liquor from the light emission detected in the wash liquor. Cooking appliance (10) after Claim 9 , characterized in that the evaluation unit (42) as a function of the concentration of the cleaning agent (18) detects an underdosing or overdose and the controller (44) displays and / or logs an error message, and / or performs a subsequent dosing of detergent (18) , Cooking appliance (10) according to one of the preceding claims, characterized in that the cooking appliance (10) has a to the cooking chamber (12) connected to drain line (24), and at the drain line (24) has a further measuring device (40) for detecting a Light emission is provided in the wash liquor. Method for cleaning a cooking appliance (10) according to one of Claims 1 to 11 wherein the method comprises a treatment step in which a wash liquor is provided with at least one cleaning agent (18) and the cooking chamber (12) is brought into contact with the wash liquor, characterized in that the at least one cleaning agent (18) contains one or more luminescent dyes wherein the luminescent dye is excited by irradiation of electromagnetic radiation and generates a light emission, and wherein the light emission is detected. Method according to one of the preceding claims, characterized in that a plurality of cleaning agents (18) are used with different composition, each containing one or more mutually different luminescent, wherein the light emission of the luminescent detected and assigned to the different compositions. Method according to one of Claims 12 or 13 , characterized in that the cleaning agent (18) contains a luminescent dye in an amount sufficient for the spectroscopic detection of a light emission. Method according to one of Claims 12 to 14 , characterized in that the cleaning agent (18) comprises one or more of the following components: a) at least one surfactant or a surfactant mixture, in particular nonionic surfactants, anionic surfactants, cationic surfactants and / or amphoteric surfactants and mixtures thereof; b) at least one enzyme for digesting carbohydrate-containing, fatty or proteinaceous contaminants; c) at least one compound from the group of carboxylic acids, fruit acids or phosphonates, in particular citric acid, malic acid, tartaric acid, 1-hydroxyethane-1,1-diphosphonic acid (HEDP), fumaric acid, maleic acid, glycolic acid, acetic acid, oxalic acid, malonic acid, succinic acid, lactic acid , Glutaric and adipic acid and mixtures thereof; and d) at least one decalcifier, in particular sulfamic acid, sodium hydrogen sulfate, salts of dihydrogen phosphate and hydrogen phosphate, phosphoric acid and boric acid and mixtures thereof. Method according to one of Claims 12 to 15 , characterized in that the luminescent dye is a phosphorescent or fluorescent dye which emits light of a wavelength in the UV / VIS range, more preferably light of a wavelength in the range of about 200 nm to 1100 nm, preferably 200 nm to 700 nm. Method according to one of Claims 12 to 16 , characterized in that the cleaning agent (18) contains the luminescent dye in a proportion of 0.001 to 10 wt .-%, preferably from 0.01 to 5 wt .-% and particularly preferably from 0.1 to 2 wt .-%.

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