Abstract: The invention relates to a method for monitoring the state of a machine, the machine comprising a sensor system, the sensor system comprising a vibration and/or temperature sensor for measuring a vibration and/or a temperature of the machine as well as a trigger sensor, the sensor system being operable in a learning mode and a state monitoring mode.

Abstract: A system for the purpose of condition monitoring of gearboxes includes processing equipment that is configured to receive data that contains information of a spectrum of mechanical vibrations measured from a gearbox being monitored. The processing equipment is configured to search, from the spectrum of mechanical vibrations, at least two spikes on such frequencies which correspond to a phenomenon such as for example a bearing fault. The phenomenon is defined with at least two phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies. The processing equipment is configured to form an indicator of probability of occurrence for the phenomenon on the basis of amplitudes of the searched spikes and the reference values of the amplitudes. The fact that the indicator is formed on the basis of amplitudes of two or more spikes which relate to this phenomenon improves the reliability of the indicator.

Abstract: A gear unit includes shafts for connecting to an external mechanical system, at least one gear stage between the shafts, a lubrication pump for circulating lubricating oil through the at least one gear stage and bearings of the gear unit, a temperature sensor for measuring temperature of the lubricating oil and supplying a temperature signal, an electrical motor for driving the lubrication pump, and an electrical device for controlling the electrical motor so that torque directed to the lubrication pump is below a torque limit. The torque limit is determined dynamically on the basis of the measured temperature of the lubricating oil. This arrangement makes it possible to protect the lubrication pump against mechanical faults during a cold start process so that an unnecessarily strict torque limitation, which would slow down the cold start process, can be avoided.

Abstract: A gear lubrication arrangement comprises a lubrication pump for circulating lubrication fluid. A power source coupled to the lubrication pump drives the lubrication pump, and a controller controls an output power of the lubrication pump. The gear lubrication arrangement comprises a pressure sensor disposed down-stream of the lubrication pump The pressure sensor is configured to measure a pressure of the lubrication fluid and to produce a pressure indication signal representative thereof. The controller is arranged to vary the output power of the lubrication pump at least partly on the basis of the pressure indication signal.

Abstract: A system for the purpose of condition monitoring of gearboxes includes processing equipment that is configured to receive data that contains information of a spectrum of mechanical vibrations measured from a gearbox being monitored. The processing equipment is configured to search, from the spectrum of mechanical vibrations, at least two spikes on such frequencies which correspond to a phenomenon such as for example a bearing fault. The phenomenon is defined with at least two phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies. The processing equipment is configured to form an indicator of probability of occurrence for the phenomenon on the basis of amplitudes of the searched spikes and the reference values of the amplitudes. The fact that the indicator is formed on the basis of amplitudes of two or more spikes which relate to this phenomenon improves the reliability of the indicator.

Abstract: The invention relates to a method for monitoring the condition of a medium in a channel, based on the transmission/emission of light, in which a light at a set wavelength is conducted through a medium layer defined by a measuring gap in a measuring head pushed in from an opening in the wall of the channel the intensity of the light passed through medium layer, or a variable proportional to it is measured, and the condition of the medium is evaluated, using measuring electronics, from the change of the intensity, according to established criteria. In the method, the wavelength of light used is such that the resolution of the aging phenomenon of the medium being monitored is optimal and the relationship of the temperature dependence of the medium to the measuring variable is taken into account. In addition, the invention also relates to a corresponding device.

Abstract: The invention relates to a method for monitoring the condition of a medium, based on the transmission/emission of light in a channel, in which a light is conducted through a medium layer defined by a measuring gap in a measuring head pushed in from an opening in the wall of the channel, the intensity of the light, or a variable proportional to it is measured through the medium layer, and the condition of the medium is evaluated, using measuring electronics, from the intensity of the change, according to set criteria. The measurement is performed using a sensor with a compact measuring head, in which the measuring electronics are essentially outside the channel, and in which the light is conducted to the measuring gap and away from the measuring gap by optical-fibre means. In addition, the invention also relates to a corresponding device.