Abstract: A method for ascertaining fluid pressure in a fluid supply network having ultrasound transducers includes emitting an ultrasound signal from at least one ultrasound transducer and measuring at least one ultrasound time of flight of the signal in the fluid along an ultrasound measurement path. The flow velocity or a quantity proportional thereto or throughput is determined from the time of flight. The fluid pressure is determined from the time of flight aided by a mathematical compensation relating to at least one influence selected from a length or length change of the measurement path or a time of flight component or change thereof along the measurement path lying in or not lying in the fluid, or a fastening or position of the ultrasound transducer relative to the measurement path or a change thereof or a latency of signal processing or a change thereof or a throughput or change thereof.

Abstract: A method for ascertaining a state of charge of an energy storage unit of a measuring device and/or a probable remaining operating time of the measuring device, includes capturing a plurality of voltage measured values for the voltage dropped across the energy storage unit and a plurality of current measured values for the current provided by the energy storage unit within a respective ascertainment interval. Subsequently, the state of charge associated with the respective ascertainment interval and/or the remaining running time associated with the ascertainment interval are ascertained in each case depending on the plurality of voltage measured values and current measured values. A measuring device for capturing a measured variable is also provided.

Abstract: The invention concerns a filter insert (1) that is provided as an exchangeable insert in a filter, in particular an oil filter, fuel filter or the like of an internal combustion engine. The filter comprises a filter housing (3) that can be separated along a separating plane (2) and the exchangeable filter insert (1) extending in an axial direction (18). Two housing parts (4, 5) of the filter housing (3) are sealed relative to one another along the separating plane (2) by means of a seal (6). The seal (6) is secured slidably and captively in the axial direction (18) on the filter insert (1).

Abstract: A filter closure system has a connecting head with a connecting web and further has a connecting end at an end face of a filter housing. The connecting head and the connecting end are matched to one another. The connecting end is pushed onto the connecting head in a mounting direction into a mounted state on the connecting head so as provide a seal-tight connection in the mounted state. The connecting end and the connecting web that extends in the mounting direction are provided with a micro toothing. When pushing the connecting end onto the connecting head in the mounting direction, the micro toothing connects by positive locking action the connecting end and connecting head with one another. The engagement of the micro toothing between connecting end and connecting head is realized along a flank of connecting web and connecting end which flank extends in the mounting direction.

Abstract: The invention concerns a filter insert (1) that is provided as an exchangeable insert in a filter, in particular an oil filter, fuel filter or the like of an internal combustion engine. The filter comprises a filter housing (3) that can be separated along a separating plane (2) and the exchangeable filter insert (1) extending in an axial direction (18). Two housing parts (4, 5) of the filter housing (3) are sealed relative to one another along the separating plane (2) by means of a seal (6). The seal (6) is secured slidably and captively in the axial direction (18) on the filter insert (1).

Abstract: A filter closure system has a connecting head with a connecting web and further has a connecting end at an end face of a filter housing. The connecting head and the connecting end are matched to one another. The connecting end is pushed onto the connecting head in a mounting direction into a mounted state on the connecting head so as provide a seal-tight connection in the mounted state. The connecting end and the connecting web that extends in the mounting direction are provided with a micro toothing. When pushing the connecting end onto the connecting head in the mounting direction, the micro toothing connects by positive locking action the connecting end and connecting head with one another. The engagement of the micro toothing between connecting end and connecting head is realized along a flank of connecting web and connecting end which flank extends in the mounting direction.