EP1828042B1 - Multifunctional pressure sensor and associated method - Google Patents

Description

The invention relates to an apparatus and a method for a safety inspection of a hydraulic conveyor system or lifting machine, in particular a hydraulic elevator system, with at least one sensor for measuring a in the pressure transmission medium of the hydraulic conveyor or lifting machine, in particular hydraulic elevator system, prevailing pressure sensor.

Recurring safety inspections, prototype tests, conformity tests and the like must be carried out on hydraulic conveying systems or lifting machines, in particular on hydraulic elevator systems, by authorized testing organizations or other persons. For a test procedure, pressure characteristic values are of interest because they can be used to conclude that the system is in a condition.

From the EP 0 373 280 A1 shows a hydraulic elevator system in which the elevator car can be moved by an actuation of one of two valves up or down. For this purpose, each of these two valves associated with two solenoid valves, which are controlled by a microprocessor. This adjusts the sinking speed as well as the rate of climb of the elevator car. The microprocessor actuates the respective solenoid valves to compensate for changes in load, temperature and pressure of the hydraulic fluid. For this purpose, the microprocessor receives, for example, a temperature prevailing in the hydraulic system as information provided.

The object of the present invention is to improve a safety inspection of hydraulic conveyor systems or lifting machines, in particular hydraulic elevator systems, and to enable a more reliable evaluation of test results and thus a higher test quality.

According to the invention this object is achieved by a device having the features of claim 1. Further advantageous variants and embodiments are specified in the respective dependent claims.

A device according to the invention with the features of claim 1 comprises a hydraulic conveyor system or lifting machine, in particular hydraulic elevator system, with at least one for measuring a in the pressure transmission medium of the hydraulic Conveyor or lifting prevailing pressure attached first sensor, at least one further, second sensor for measuring at least one other different from the pressure measurement of the hydraulic conveyor system or lifting machine to be tested.

A proposed measuring device of a hydraulic conveyor system or working machine, in particular a hydraulic elevator system, has at least one first for measuring a pressure prevailing in a pressure transmission medium of the hydraulic conveyor system or working machine attachable first sensor and comprises at least one further, second sensor for measuring another different from the pressure Measured variable of the hydraulic conveyor system or work machine to be tested.

In addition to pressure characteristics, for example, further safety parameters are determined, which in particular can significantly improve the informative value and quality of the measurement. In addition, system parameters in particular can be considered objectively when determining a test result.

In one embodiment of the device, the measured variable, which monitors the second sensor, characterizes a state of the pressure-transmitting medium.

According to another idea, the second sensor is selected from the group of viscosity sensor, ultrasonic sensor, optical sensor, acoustic sensor, temperature sensor or conductivity sensor. As a safety parameter, for example, a measured variable from the group temperature, viscosity and contamination of a pressure transmission medium, in particular oil temperature, oil viscosity and oil quality is selected.

In another aspect, the second sensor is an acceleration sensor and / or a friction sensor. For example, suitable parameters which are useful in determining the test result are, in particular, a mass inertia force of a nominal load and a guide friction due to eccentric load suspension. In addition, plant-specific characteristics and / or safety specifications are preferably taken into account.

Suitable sensors for measuring at least the above-mentioned and non-printing system parameters are preferably proposed as follows: A sensor for measuring a medium quality, e.g. an optical sensor and / or an acoustic sensor and / or an ultrasonic sensor, a temperature sensor for measuring a temperature of a pressure transmission medium, an acceleration sensor for measuring a mass inertia, a conductivity sensor for measuring the medium conductivity, a viscosity sensor for measuring the viscosity of the medium and a device for measuring different leadership friction.

For measuring a pressure prevailing in a pressure transmission medium, a static or dynamic pressure acting perpendicular to the working direction of the pressure transmission medium is preferably measured. As pressure sensors, for example, capacitive sensors or piezoelectric sensors are used, which manage without moving parts and can be used in the typical pressure range of preferably 1 bar to 150 bar.

For the measurement of a temperature of a pressure transmission medium, for example, a thermocouple or a resistance thermometer are used, which can be used in a wide temperature range, for example from - 25 ° C to 95 ° C. Both sensor types guarantee a compact sensor design.

The optical sensor for measuring a pressure transmission medium quality measures, for example spectrally resolved in a suitable light wavelength range of preferably 635 nm to 950 nm, the optical transmission of the medium. As a result, in particular the transmission-reducing particles, for example foreign particles or lumps of a pressure-transmitting fluid, or gas bubbles are detected. In particular, changes in optical properties of the pressure-transmitting medium are detected. Preferably, a spectral transmission is used or else a spectrally integrated transmission. The light source is, for example, a halogen incandescent lamp or another spectral light source, or in special applications also one or more LEDs, which in particular also ensures a compact design becomes. One or more photodiodes or a photodiode array are preferably used as the detector. For spectral filtering, for example, narrow-band optical filters or a wavelength-dispersive element are used. A transmitter and receiver optics of the optical sensor is preferably arranged in a Meßzangenkonfiguration or opposite to the ends of a U-profile, which projects into the pressure transmission medium. For the detection of particles or gas bubbles in the pressure transmission medium, scattered light is also detected, for example, on these objects, preferably with a detector located outside the geometric beam path.

Undesirable gas bubbles can occur, especially at elevated temperatures in a pressure transfer fluid.

In a further embodiment, to measure contaminations of a pressure-transmitting medium with foreign particles or gas bubbles, in particular instead of an optical measurement, it is also preferable to use a measurement with the aid of an ultrasonic method. In this case, an ultrasonic signal is coupled into the pressure transmission medium with an ultrasound probe. An ultrasonic signal reflected on particles and / or gas bubbles is recorded, for example, with a sound transducer and converted into an electrical signal. In particular, a minimum size of detectable particles is set by the choice of an ultrasound frequency, the minimum size generally increasing with the ultrasound frequency. At an ultrasonic frequency of 8 MHz, for example, particles and gas bubbles can be detected down to a diameter of 6 μm.

In a further embodiment of the invention, acoustic sensors are also used in conjunction with ultrasound probes for measuring a flow velocity of a pressure transmission medium. In this variant, for example, a transit time difference between two ultrasonic pulses emitted in and against a direction of flow of the pressure-transmitting medium is measured and from this an average flow velocity is derived. In particular, no material parameters, such as, for example, a density of the pressure-transmitting medium, are necessary for this purpose.

For the measurement of a conductivity of a pressure transmission medium, for example, a resistance measurement is carried out with the aid of media in contact and defined spaced electrical test electrodes. For this purpose, for example, a current flowing through the electrodes through the pressure transmission medium test current and the associated voltage is measured.

For the measurement of a viscosity of a pressure transmission medium, for example, a friction wheel sensor is used, which in particular has an optionally deactivatable brake coil. In this case, the pressure transmission medium flows perpendicular to a rotation axis of a friction wheel. By an asymmetric flow the friction wheel is driven, which is provided with a brake coil. A temperature necessary for determining a meaningful viscosity is measured, for example, with a temperature sensor described above or else with a separate temperature sensor integrated in the viscosity sensor. When the brake coil is deactivated, the arrangement also makes it possible to measure a flow velocity of the pressure-transmitting medium.

In particular, in addition to at least one sensor which measures a characteristic of a pressure transmission medium, for example at least one further sensor is used to measure at least one other property of the pressure transmission medium other than the characteristic of the hydraulic conveyor system or lifting machine to be tested.

For the measurement of differing guide friction between load-receiving means of a lifting machine and its guide elements is determined for example by means of a direct force measurement or by an indirect system pressure measurement.

For the measurement of an acceleration, an inertia measuring module is used, for example, to measure the mass inertia force which occurs during an accelerated movement of a mass with a force measuring device. Preferably, the acceleration is measured with micromechanical acceleration sensors. For example, in an exam, it is of interest to accelerate the mass of a load-handling device.

According to another idea, in a further advantageous variant, a plurality of sensors are accommodated in a common sensor housing. For example, a sensor housing contains a light spectrum measuring module, a temperature sensor, a medium conductivity sensor and a pressure sensor. Preferably, several sensors can be compact and thus save space in a common housing.

Such a housing is preferably made of metal or plastic. Preferably, a common housing has a common preferably mechanical interface for a plurality of sensors to be tested system. This interface is realized for example as a flange, preferably as a round flange. By combining several sensors are connected to a single junction on the system to be tested in particular simultaneously recorded different measured quantities. As a result, preferably the number of connection points to be provided on the device to be tested for sensors can be correspondingly reduced. In addition, in this measuring arrangement, in particular, it is possible to record the different measured variables at the same measuring location. This is particularly useful for the measurement of a viscosity, which should always be measured using a temperature. Furthermore, in this way it is possible, in particular, to be able to measure several different physical parameters at a plurality of measuring points or measuring locations, despite the often limited number of possible measuring points on a system to be tested.

For example, a first housing contains the first sensor, which is a pressure sensor, and a temperature sensor, whereas a second housing contains, for example, an ultrasound measuring module for measuring the pressure transmission medium quality and a conductivity sensor.

In an advantageous modification, sensors which are in contact with the pressure-transmitting medium are designed such that the sensor housing on the sensor side hermetically seals the pressure-transmitting medium and thus the pressure circuit from the environment. Preferably, the sensor with its housing is constructed so that on the side facing away from the pressure transmission medium of its housing a fastening device, preferably a plug device is provided, on which an evaluation unit can be plugged and / or by means of which the measurement signal can be tapped at electrical contacts ,

In a further embodiment, at least one of the sensors is fixedly connected to the device, in particular the system to be tested.

In a further embodiment, the device according to the invention, in particular the proposed measuring device, includes at least one memory for storing at least one measured value measured with at least one sensor and / or for storing at least one plant-specific characteristic value which can be stored in the memory and / or at least one safety-related specification. For example, a battery-buffered volatile RAM semiconductor memory device is used for a memory. However, other, in particular non-volatile memory modules can also be used. For example, EEPROM memory devices or magnetoelectronic memories are used. Preferably, each sensor is equipped with a memory. In particular, memory may be useful in a number of applications described below.

In a further embodiment, at least one of the sensors is fixedly connected to the device, in particular the system to be tested.

The device according to the invention comprises at least one memory for storing at least one measured value measured with at least one sensor and / or for storing at least one plant-specific characteristic value that can be stored in the memory and / or at least one safety-related specification. For example, a battery-buffered volatile RAM semiconductor memory device is used for a memory. However, other, in particular non-volatile memory modules can also be used. For example, EEPROM memory devices or magnetoelectronic memories are used. Preferably, each sensor is equipped with a memory. In particular, memory may be useful in a number of applications described below.

Furthermore, in an advantageous variant, the device, in particular the measuring device, comprises means for evaluation, in particular an evaluation unit, for automatically taking into account at least one measured value measured at least with the first and / or the second sensor and / or data stored in a memory a determination of a test result of a monitoring.

For example, in a simple variant, the measurement signal outputs of corresponding sensors are permanently wired to an evaluation circuit, so that, for example, sensor output voltages are added to a test result total voltage. In a further developed refinement, the evaluation is preferably carried out with an evaluation unit which links, as input variables, for example, data measured at least with the first sensor and / or the second sensor and / or in a memory to a test result with the aid of an evaluation logic. Rules and algorithms used in an evaluation are stored and implemented, for example, in a microprocessor. The evaluation preferably takes place on the basis of defined characteristic diagrams. For example, the evaluation can also be done on the basis of stored in the memory tables.
tion medium, for example, by partial decomposition of the hydraulic oil molecules of a hydraulic oil used in a hydraulic elevator system, determine. Likewise, for example, a thickening of a hydraulic oil can be detected.

Such inputable parameters are preferably included in the evaluation algorithm. For this purpose, stored in a memory parameters as a further input variable with the Auswertelogik, e.g. is implemented in a microprocessor.

In particular, a graduated evaluation of a test result is carried out with the aid of a suitable testing and evaluation algorithm, taking into account preferably different measured values and system parameters. In particular in the case of staggered measurements, for example in the case of annual successive tests, a trend within different test results can preferably be identified with the algorithm used. For example, significant safety deficiencies, which must lead to a negative test results, can be identified, which could not have been identified as such with a single pressure measurement. Thus, for example, the test result is negative if the light spectrum measuring module has identified safety-relevant foreign particles in the pressure transmission medium, although pressure characteristics considered in isolation lie within the specified tolerances.

According to a further idea, measurement takes place with the first sensor and at least the second sensor with a temporal relationship, for example offset in time or in parallel. In one variant, a test procedure, for example, to perform time-offset measurements with the respective sensors. Preferably, a test program is run through with different stress levels, the results of which are combined into a single test result. The load levels may be, for example, different starting or braking accelerations or different loading stages, for example, a hydraulic elevator. In a further embodiment, the measured values are recorded by a timer or manually controlled. However, temporally parallel measurements are also possible.

In a further advantageous variant, the device, in particular the measuring device, includes at least one transmitting and at least one receiving unit, which are connectable to at least one sensor and / or at least one evaluation unit and / or at least one external data processing system, for radio and / or wired and / or infrared-bound transmission and / or reception of Data for communication between at least one sensor and / or at least one evaluation system and / or at least one external data processing system.

Preferably, a transmitting and / or receiving unit is associated with an input / output scanning module to account for external data in the input and an output to external receivers. With the aid of a scanning module, e.g. individual input and output data sequentially on or read and are stored for example in a memory. In a further variant, for example, a stream-based data transmission is provided. In this case, the communication preferably does not take place with input and output data sent separately in individual data packets but rather with a data stream which may contain data in any order and composition. For an assignment of different transmitting and / or receiving units to a device, in particular a measuring device, an identification code is preferably exchanged and checked, which prevents unauthorized manipulation.

With a radio, wire or infrared bounded data transmission, preferably a radio, wire or infrared bound data input and data output is made possible. A radio-bound variant is particularly advantageous in spatially widely spaced and difficult to access measuring points. An infrared-bonded variant is preferably used in environments in which insensitivity of the data transmission to electromagnetic interference is desirable and / or required.

According to a further idea, in an advantageous development of the radio-linked variant, in particular several systems within an entire system park are simultaneously monitored safety-related with the aid of a PC center. In conjunction with permanently installed sensors, for example, this allows real-time monitoring of one or more systems during normal operation. This is useful, for example, in the development of prototypes of hydraulic conveyors or hoists for identifying critical equipment conditions.

Furthermore, a radio-bound variant is also preferably used in mobile hydraulic conveyor systems or lifting machines, for example on construction sites.

Preferably, transmitting and receiving modules are also provided for inputting plant-specific characteristic values to be entered into a memory provided for this purpose. Particularly preferred for input is one with a transmitting and receiving module equipped data processing system provided. In particular, the data processing system is configured in a further variant as a handheld.

According to a further idea, the device, in particular the measuring device, is equipped with a data encryption and / or decryption. Preferably, the data encryption and / or decryption is integrated in the transmitting and / or the receiving unit. For example, however, an encryption of data in particular also takes place at least one sensor. In particular, data is stored encrypted in a memory.

Preferably, the device, in particular the measuring device, has a modular structure, specifically such that different sensors are combined to form sensor groups in a respective housing. In addition to sensors for the determination of measured quantities of the pressure-transmitting medium, the measuring device also contains, in a further variant, one or more sensors for measuring at least the above-described further system parameters such as, for example, a starting acceleration.

In a further embodiment, at least one of the sensors and / or means for evaluation of the device, in particular the system to be tested, repeatable separated. In particular, the measuring device or at least parts thereof are designed in an advantageous embodiment so that they are repeatedly releasably connectable to the system to be tested. This is utilized in particular in the case of repeated temporary safety checks of hydraulic conveying systems or lifting machines, in particular hydraulic elevator systems.

For example, sensors preferably accommodated in one or more housings for measuring measured variables of the pressure-transmitting medium are connected, for example, to a flange or to a plurality of flanges on a hydraulic line. However, a connection can in principle also take place at any other suitable point of the pressure transmission circuit. In particular, further sensors for measuring, for example, further system properties are connected to the hydraulic conveyor system or lifting machine in a repeatable detachable manner at suitable locations. In a hydraulic elevator installation, for example, a mass inertial force meter for measuring an acceleration of an elevator cage is fastened to the latter in a repeatably detachable manner.

The evaluation unit is attached to the sensor, for example with the aid of a fastening device provided on a sensor, preferably a plug-in device. wherein the measuring signal can preferably be tapped at electrical contacts of the plug-in device.

In a preferred variant, the evaluation unit is designed as a handheld. This is preferably equipped with a transmitting / receiving unit, with the help of which measurement data from also equipped with transmitting / receiving units sensors, preferably contactless, can be read. The sensors remain in particular over a longer period or permanently on the system, whereby an otherwise necessary opening of the pressure circuit for mounting sensors for a new measurement is avoided.

In particular, in a further embodiment in which at least one of the sensors is fixedly connected to the device, in particular the system to be tested, at least one evaluation unit for transmitting measured values measured with the respective sensor can be plugged onto and / or connected thereto. This variant may be advantageous, in particular in the case of measuring points located far away from one another in a location where wiring for a temporary measurement appears too expensive. Preferably, such a solution is realized with reversibly separable connections between sensors and an evaluation unit. The test cycle provides, for example, that a tester sequentially connects an evaluation unit to a series of stationary sensors, where the respective measured values are recorded by the sensor, which are stored in a memory of the evaluation unit and linked to the final sensor for the overall test result at the end of a measurement , The order is preferably predetermined by the evaluation unit. In a further embodiment, sensors themselves contain a memory so that it can already contain measured values which were recorded, for example, on the basis of a timer control. When connecting to an evaluation unit, these already measured values are transmitted to the evaluation unit. In a preferred variant, the acquisition of measured values in accordance with the method described above takes place without contact with a handheld device, instead of with a plug-on evaluation unit.

According to a further embodiment, due to a separable connection between sensor and evaluation unit, the same evaluation unit is used in particular for different compatible sensors, in particular for several elevator systems, which represents a cost-effective variant. In a preferred variant with a light spectrum measuring module, only one optical system for coupling the measuring light and for coupling the measuring light into a sensor housing is integrated. The remaining part of the Lichtspektrummessmoduls, in particular the necessary light source together with the detector and spectral light separation, are preferably housed in an attachable evaluation. The connection takes place, for example, with the aid of fiber optic coupling plugs.

In a further embodiment, the connectivity between the means for evaluation and at least the first and the second sensor can be separated exactly once irreversibly. Preferably, a later unauthorized measurement and / or an unauthorized manipulation of a test result is excluded. A renewed connection can preferably be restored only after a reconditioning of the connectivity to be provided.

In another variant, the connectivity is designed so that a multiple reversible separation of the compound, for example, three times, is possible and the compound can then be separated once irreversible. The irreversible separability can be realized for example by latching means, which are destroyed during separation.

In a further embodiment, the device, in particular the measuring device, includes a display module. The display module has, for example, a display, preferably a liquid crystal display, for the alphanumeric representation of data and for the graphical representation of, for example, measurement data and serves in particular for communication with a user. Furthermore, the display module has, for example, a loudspeaker for outputting an acoustic warning or advisory tone and / or an optical status display, preferably via a plurality of differently colored indicator lights.

In a further advantageous embodiment of the invention, at least for the output of data a bar code data memory, in particular for storing test results is provided. In this variant, for example, at least a part of the test results is stored on the barcode data memory. In particular, a European Article Number Code (EAN) defined in a European standard can be used for fast and automatic readout of the bar code memory. The bar code data memory is preferably designed as an optically variable display element, for example as a graphic LCD display.

In another advantageous embodiment, the device includes an electronic memory test badge having a time-limited validity certificate.

According to a further idea, a memory test sticker of the device is provided which comprises a memory for storing at least one test result and / or one or more specific system characteristics. Preferably, test results with high protection against counterfeiting are archived on the memory test badge. Furthermore, this preferably contains an additional bar code memory.

In a further variant, the electronic memory test badge is also equipped with a transponder and / or a transmitting / receiving unit. In this way, for example, an advantageous remote query the electronic memory test badge.

Below, the invention with reference to the drawing in several embodiments is explained in detail by way of example. However, the features are not limited to the individual embodiments. Rather, features indicated in the drawing and / or in the description including the description of the figures can each be combined to form further developments.

• Fig. 1 einen schematischen Querschnitt einer Messvorrichtung,
• Fig. 2 eine schematische Darstellung einer Sensoreinheit nebst Schnittstelle,
• Fig. 3 eine schematische Darstellung einer Auswerteeinheit,
• Fig. 4 eine schematische Darstellung einer externen Datenverarbeitungsanlage / PC-Zentrale und
• Fig. 5 eine elektronische Speicherprüfplakette.

Show it:

• Fig. 1 a schematic cross section of a measuring device,
• Fig. 2 a schematic representation of a sensor unit together with interface,
• Fig. 3 a schematic representation of an evaluation unit,
• Fig. 4 a schematic representation of an external data processing system / PC center and
• Fig. 5 an electronic memory test badge.

In Fig. 1 First, a schematic overview of an exemplary measuring device is given. A sensor housing 1, which contains a sensor unit 2 together with a first connector 3 designed as a socket which forms a counterpart to a second plug connector 4 designed as a plug, is connected to a hollow body 5 comprising a pressure transfer medium, in which the medium to be tested, the pressure transfer medium 6, is located, connected. With regard to the occurring Pressures, the sensor housing 1 is constructed in this example of metal. In the embodiment shown, the connection is made at a reservoir for the pressure transmission medium 6. Likewise, the connection can also take place, for example, on a line for pressure transmission.

In the illustrated configuration, a static pressure is measured with a first sensor. Preferably, for the measurement of a dynamic pressure in a pitot configuration and / or for measuring a viscosity of the pressure transmission medium 6, an end of the sensor unit facing the medium in a variant not shown here projects into the cross section of the hollow body comprising the pressure transmission medium, contrary to the representation shown here 5 into it.

To the right of the sensor housing 1, an evaluation unit 7 connects, which has a plug connector designed as a second connector 4. The two connectors 3, 4 form a detachable plug connection. The connector ensures both a mechanical and a signal and data transmission connection of the sensor unit 2 and evaluation 7. The evaluation unit 7 is hermetically separated from the pressure transmission medium 6. The first connector 3 not shown in detail here is a socket arrangement for a number of electrical contact pins and the second connector 4 is a plug arrangement for a number of electrical contact pins. In addition, the plug connectors in particular also have a coupling for optical fibers. The connector is secured with a union screw not shown here against unwanted loosening.

In the Fig. 2 shown sensor unit includes a pressure sensor 8, and in this example a second sensor 9, a third sensor 10 and a fourth sensor 11, wherein the individual sensors are shown here only schematically in a one-piece module. In this example, the second sensor 9 is an optical sensor, in this case a light spectrum measuring module, the third sensor 10 is a medium temperature sensor and the fourth sensor 11 is a medium conductivity sensor. The measuring signals of the sensors 8, 9, 10, 11 are applied to contacts not shown here on the part 4 of the connector, from where they are taken over into the evaluation unit.

The sensor unit is designed so that it can be exchanged for other sensor units by a sensor unit is removed from a sensor housing and a new one is used. In another variant, sensor unit and sensor housing can also be a single component.

In Fig. 3 is an evaluation 7 again shown in detail. From the plug-in device 4, the measurement signals are passed to a multiplex module 12, where they are cached. In particular, the individual sensor signals are sequentially read out with the multiplex module. From the memory of the multiplex module but also on a direct path single or multiple measurement signals are transmitted to an evaluation logic 13 with a memory 14 connected thereto. The evaluation logic 13 is implemented in this example with a microprocessor.

The evaluation logic 13 is programmable for the implementation of various test and evaluation algorithms, wherein the programming in the selected example via the data transmission interface 18 by means of an external data processing system 19, a computer, takes place.

The evaluation unit 7 also has a power supply module 15. The power supply module 15 is realized with regard to the mobile application with batteries or a battery. In addition, the evaluation unit 7 has a connection for an external power supply. Furthermore, the voltage supply of at least the first and the second sensor also takes place via the power supply module 15 of the evaluation unit 7, so that no electrical connections have to be provided on the part of a hydraulic conveyor system or lifting machine to be tested.

In addition, the evaluation unit 7 has a display module 16. With this display module 16, the communication between the measuring device and the user takes place. It is an alphanumeric display with the ability to graph data in addition. Furthermore, status lights and a loudspeaker or buzzer are provided, whereby, for example, a tester can output a test result as a simple optical or acoustic binary "YES / NO" signal.

In addition, the evaluation unit 7 preferably has an input / output scanning module 17 with an integrated transmitting and receiving unit. By way of this input / output scan module 17, various useful system data (such as rated load, effective piston area, eccentric load receiving, guide friction value, starting acceleration, viscosity factor of the medium, etc.) that are useful for the evaluation algorithm and entered, for example, by a tester are entered. Due to the integrated transmitting and receiving unit, the data to be entered is preferably input via a computer with a connected transmitting and receiving unit. On the basis of measured values measured at least with the first and at least the second sensor and preferably at least one plant-specific input variable, for example of the aforementioned type, a test result is generated with the aid of an evaluation algorithm. This test result is preferably acoustically and / or optically signaled as a binary YES / NO statement via the display module 16, as well as provided in quantitative form via the display module 16 and preferably also via the input / output scan module 17 for further processing ,

The further processing of the data, for further data analysis of several test series and several systems, takes place in an external data processing system in which a comprehensive archiving of several test results of several systems takes place.

The results obtained and data are thereby output via a wired to the evaluation logic 13 with the associated memory 14 interface 18. The wired interface 18 is e.g. realized as a serial USB interface.

Alternatively, the results and data are also sent radio or infrared bound. The wire, radio or infrared-bound data transmission is encrypted here. Furthermore, the data transmission takes place in the form of digital signals, for which the evaluation unit 7, for example, also contains an analog-digital converter circuit. Furthermore, the digital data transmission is equipped with error correction methods, whereby a falsification of the transmitted measurement results due to electromagnetic interference is minimized. In particular, by a suitable and known in the art methods and algorithms for encryption, using a 128-bit key, protection against manipulation of data transmission is ensured.

The obtained results and data are then analyzed by an in Fig. 4 illustrated external data processing system 19 and / or a PC center 19 received. For this purpose, it has on the one hand an interface 20 for wired communication, which is also implemented here as a USB interface, and on the other hand via an input / output scan module with integrated transmitting and receiving system 21 for the infrared and radio-bound communication. About this input / output scan module 21 also be described above and transmitted to the data processing system 19, for example, by an auditor system parameters to the evaluation. In addition, the results and data are sent to an in Fig. 5 shown electronic memory test badge 22 issued. This electronic memory test badge 22 is attached directly to the equipment to be tested, preferably so that it can not be removed and manipulated nondestructively. The memory test badge 22 preferably has a valid validity certificate valid for a limited time. For non-volatile storage of the test results, it preferably has a data memory chip. In a further embodiment, it is equipped in particular with an integrated transponder 23. In addition, an output is also effected by means of a bar code data memory module 24 which is integrated in the electronic memory test badge 22.

Claims (15)

1. Device, comprising a hydraulic conveyor system or lifting machine, in particular a hydraulic elevator system, comprising a first sensor (8) arranged for monitoring a pressure prevailing in a pressure transfer medium (6) of the device, and a second sensor (9) provided at a common connection point of the hydraulic conveyor system or lifting machine in a common housing for monitoring at least one further measured variable of the device other than the pressure,
   characterized in that
   the device includes at least one memory (14) for storing at least one measured value measured by means of at least one sensor (8, 9), and for storing at least one system-specific characteristic value, which is at least storable in the memory (14), and at least one safety-related specification.
2. Device of claim 1, characterized in that the measured variable monitored by the second sensor (9) characterizes a state of the pressure transfer medium.
3. Device of one of the preceding claims, characterized in that the second sensor (9) is selected from the group consisting of viscosity sensors, ultrasound sensors, optical sensors, acoustic sensors, temperature sensors or conductivity sensors.
4. Device of one of the preceding claims, characterized in that an acceleration sensor and/or a guide friction sensor is provided as a third sensor.
5. Device of one of the preceding claims, characterized in that at least one of the sensors is connected with the device, in particular the system to be tested, in a stationary manner.
6. Device of one of the preceding claims, characterized in that it comprises means for evaluation, in particular an evaluation unit (7), for an automatic consideration of at least one measured value measured with the first (8) or a second sensor (9) and/or data stored in a memory, when determining a test result of a monitoring.
7. Device of claim 6, characterized in that it comprises at least one transmission (17) and at least one receiving unit (17) respectively connected with at least one sensor (8, 9) and/or at least one evaluation unit (7) and/or at least one external data processing system (19), for the wireless and/or wired and/or infrared transmission and receiving of data for the communication between at least one sensor (8, 9) and/or at least one evaluation unit (7) and/or at least one external data processing system.
8. Device of claim 7, characterized in that it is provided with a data encryption and/or decryption.
9. Device of claim 8, characterized in that at least one of the sensors (8, 9) and/or evaluation means are repeatedly detachable from the device.
10. Device of claim 6, characterized in that the evaluation means are adapted to be connected, in particular to be plugged on, at least to the first (8) and the second sensor (9), in particular for the transmission of measured values measured by the respective sensor (8, 9), and, in particular, to be reversibly detachable therefrom.
11. Device of one of the preceding claims 6 to 10, characterized in that a connection between the evaluation means and at least the first (8) and the second sensor (9) is irreversibly detachable exactly once.
12. Device of one of the preceding claims, characterized in that it comprises a display module (16).
13. Device of one of the preceding claims, characterized in that a barcode data memory (24) in particular for storing test results is provided at least for the output of data.
14. Device of one of the preceding claims, characterized in that it comprises an electronic memory test tag (22) which includes a terminable validity certificate.
15. Device of one of the preceding claims, characterized in that an electronic memory test tag (22) is provided which comprises a memory (23) for storing at least one test result and/or one or more specific system parameters.

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