Abstract: A pump assembly includes an electrical drive motor (2) and an impeller which is connected to the drive motor (2) via a shaft (14). The shaft extends between the drive motor (2) and the impeller, through a seal arrangement with a fluid reservoir (22). A method is provided for detecting a concentration change in a fluid reservoir in the seal arrangement in the pump assembly. A concentration sensor (30) detects a concentration change in the fluid reservoir (22), and a second sensor (32) detects at least one further parameter of the fluid reservoir (22). The sensors are arranged on the fluid reservoir (22). The sensors are connected to an evaluation device (22). The evaluation device (34) is configured to carry out an evaluation of at least one reading of the concentration sensor (30), taking into account at least one reading which is detected by the second sensor (32).

Abstract: A pump assembly includes an electrical drive motor (2) and an impeller which is connected to the drive motor (2) via a shaft (14). The shaft extends between the drive motor (2) and the impeller, through a seal arrangement with a fluid reservoir (22). A method is provided for detecting a concentration change in a fluid reservoir in the seal arrangement in the pump assembly. A concentration sensor (30) detects a concentration change in the fluid reservoir (22), and a second sensor (32) detects at least one further parameter of the fluid reservoir (22). The sensors are arranged on the fluid reservoir (22). The sensors are connected to an evaluation device (22). The evaluation device (34) is configured to carry out an evaluation of at least one reading of the concentration sensor (30), taking into account at least one reading which is detected by the second sensor (32).

Abstract: A hydraulic heating and/or cooling system hydraulic manifold is constructed in a modular manner with a main module (2). At least one load module (4) is connectable to the main module (2) and includes a hydraulic connection (22, 24) for a load circuit, and a closed-loop control device (26, 28) controlling flow through the load and for connection to an identically configured further load module (4). The at least one load module (4) includes a circuit board (44) which extends between a first (34) and a second axial end (36) of the load module (4) and which at its first (34) and second end (36) have electrical couplings (50, 52) which correspond to one another. The electrical coupling (52) at the second end (36) of the circuit board (44) can electrically conductively engage with an electrical coupling (50) at the first end (34) of the further identical load module (4).

Abstract: A hydraulic valve includes a valve housing (4) with an inside that defines at least one first flow path (7), and with a valve insert (16) which is arranged in the inside of the valve housing (4). The valve insert (16) includes a movable valve element (14) situated in the first flow path (7). An infrared temperature sensor (46) is arranged on or in the valve housing (4) and is directed onto a surface of the valve insert (16) or a surface of a thermal conductor (48) connected to the valve insert. A hydraulic manifold may be provided with such a hydraulic valve.

Abstract: The invention relates to a service water heating unit (2) comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, a cold water line (DCW) and a circulation line (90) for heated service water opening into a junction (97) in an inlet line to the second flow path (12) of the heat exchanger (6), and comprising a control unit (101) for controlling the heating of service water, the control unit (101) being designed for detection of a service water request, wherein the control unit (101) is designed for evaluation of the output signal of a temperature sensor (96) which is arranged in the vicinity of the junction (97), but at a distance therefrom, in the cold water line (DCW).

Abstract: A hydraulic valve includes a valve housing (4) with an inside that defines at least one first flow path (7), and with a valve insert (16) which is arranged in the inside of the valve housing (4). The valve insert (16) includes a movable valve element (14) situated in the first flow path (7). An infrared temperature sensor (46) is arranged on or in the valve housing (4) and is directed onto a surface of the valve insert (16) or a surface of a thermal conductor (48) connected to the valve insert. A hydraulic manifold may be provided with such a hydraulic valve.

Abstract: A hydraulic heating and/or cooling system hydraulic manifold is constructed in a modular manner with a main module (2). At least one load module (4) is connectable to the main module (2) and includes a hydraulic connection (22, 24) for a load circuit, and a closed-loop control device (26, 28) controlling flow through the load and for connection to an identically configured further load module (4). The at least one load module (4) includes a circuit board (44) which extends between a first (34) and a second axial end (36) of the load module (4) and which at its first (34) and second end (36) have electrical couplings (50, 52) which correspond to one another. The electrical coupling (52) at the second end (36) of the circuit board (44) can electrically conductively engage with an electrical coupling (50) at the first end (34) of the further identical load module (4).

Abstract: The invention relates to a pump system comprising at least one pump unit, a control unit for controlling the pump unit and at least one sensor, wherein the sensor is connected to a data detection module which is spatially separate from the control unit and detects the output signals of the sensor, the data detection module comprises an output interface, at which it provides the detected sensor signals and/or data derived therefrom, and the control unit is provided with an input interface for the acquisition of signals or data from the output interface.

Abstract: The invention relates to a service water heating unit (2) comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, a cold water line (DCW) and a circulation line (90) for heated service water opening into a junction (97) in an inlet line to the second flow path (12) of the heat exchanger (6), and comprising a control unit (101) for controlling the heating of service water, the control unit (101) being designed for detection of a service water request, wherein the control unit (101) is designed for evaluation of the output signal of a temperature sensor (96) which is arranged in the vicinity of the junction (97), but at a distance therefrom, in the cold water line (DCW).

Abstract: The invention relates to a pump system comprising at least one pump unit, a control unit for controlling the pump unit and at least one sensor, wherein the sensor is connected to a data detection module which is spatially separate from the control unit and detects the output signals of the sensor, the data detection module comprises an output interface, at which it provides the detected sensor signals and/or data derived therefrom, and the control unit is provided with an input interface for the acquisition of signals or data from the output interface.