Abstract: The invention relates to an explosion-protected housing for means for transmitting and/or receiving electromagnetic radiation (2, 2a, 2b). The housing comprises a housing body (1) that is configured to receive such transmission and/or reception means (2, 2a, 2b) and a window element (5) having a first side (7) that faces the housing interior and an opposite second side (6) that faces away from the housing interior, wherein the window element (5) transmits electromagnetic radiation. The housing body (1) has a flanging (11) on the second side (6) of the window element (5), said flanging pressing the window element (5) in the direction of a seat (13) that is formed in the interior of the housing such that the housing is formed as a pressure-resistant housing and/or as a dust-tight housing.

Abstract: A modular multi-sensor fire detector (300) that has an evaluation unit and a plurality of sensor heads (100) which are arranged locally at a distance from the evaluation unit and are connected to the evaluation unit in a signal-conducting manner, wherein the evaluation unit (200) can be connected in a signal-conducting manner to an alarm signal receiving device (301) which is locally at a distance.

Abstract: A method is provided for cleaning an optical entry window (1) of a fire detector (2), wherein an intermittent gas stream is discharged from at least one gas exit opening (7) onto the surface of the optical entry window (1) of the fire detector (2), wherein the intermittent gas stream having a number of pressure pulses (14) is discharged onto the optical entry window (1), and to an apparatus for cleaning an optical entry window. The method has the advantage that the optical entry window of a fire detector can be cleaned from contamination intermittently and corresponding to the intensity of contamination with a matched and low consumption of gas.

Abstract: The invention relates to a hazard detector for an evaluation unit (12, 14), e.g. a fire detector and/or extinguishing control center (12). The hazard detector (10) comprises a housing (16) having at least one sensor unit (22) or a sensor interface for connecting the sensor unit (22) to capture a hazard parameter. Moreover, the hazard detector (10) comprises a first electronic assembly (26), electrically connected to the sensor unit (22) or the sensor interface, for processing sensor signals of the sensor unit (22), and a second electronic assembly (30), connected to at least one first interface (38) for electrically connecting the second electrical assembly (30) to a physically remote evaluation unit (12, 14). In this arrangement, the first electronic assembly (26) and the second electronic assembly (30) comprise a wireless data connection (32) for transmitting the processed sensor signals from at least the first electronic assembly (26) to the second electronic assembly (30).

Abstract: The invention relates to a hazard detector for an evaluation unit (12, 14), e.g. a fire detector and/or extinguishing control center (12). The hazard detector (10) comprises a housing (16) having at least one sensor unit (22) or a sensor interface for connecting the sensor unit (22) to capture a hazard parameter. Moreover, the hazard detector (10) comprises a first electronic assembly (26), electrically connected to the sensor unit (22) or the sensor interface, for processing sensor signals of the sensor unit (22), and a second electronic assembly (30), connected to at least one first interface (38) for electrically connecting the second electrical assembly (30) to a physically remote evaluation unit (12, 14). In this arrangement, the first electronic assembly (26) and the second electronic assembly (30) comprise a wireless data connection (32) for transmitting the processed sensor signals from at least the first electronic assembly (26) to the second electronic assembly (30).

Abstract: The invention relates to a modular multi-sensor fire detector (300). The invention proposes that the detector (300) has an evaluation unit and a plurality of sensor heads (100) which are arranged locally at a distance from the evaluation unit and are connected to the evaluation unit in a signal-conducting manner, wherein the evaluation unit (200) can be connected in a signal-conducting manner to an alarm signal receiving device (301) which is locally at a distance. The invention also relates to a fire detection system having such a detector.

Abstract: The invention relates to an explosion-protected housing for means for transmitting and/or receiving electromagnetic radiation (2, 2a, 2b). The housing comprises a housing body (1) that is configured to receive such transmission and/or reception means (2, 2a, 2b) and a window element (5) having a first side (7) that faces the housing interior and an opposite second side (6) that faces away from the housing interior, wherein the window element (5) transmits electromagnetic radiation. The housing body (1) has a flanging (11) on the second side (6) of the window element (5), said flanging pressing the window element (5) in the direction of a seat (13) that is formed in the interior of the housing such that the housing is formed as a pressure-resistant housing and/or as a dust-tight housing.

Abstract: A method for measuring a line resistance RL (7) and determining control line (16) faults in a hazard warning and control system. The control lines (16) connect a control device (20) to an actuator (10) using an actuation voltage UA in the case of an event and supplies the actuator (10) with a monitoring voltage UM in the case of a monitoring process using a monitoring module (21). Furthermore, the control device (20) has a constant current sink (6), which can be activated by a microcontroller (1), and a switchover device (5). In order to determine the line resistance RL (7), a constant voltage supply is provided in a measurement time interval ?tM by an energy store (9) integrated into the monitoring module (21) and is fed back to the control device (20), and the switchover device (5) deactivates the monitoring voltage UM supply from the control device (20) to the actuator (10) during the entire measurement time interval ?tM.

Abstract: A method is provided for cleaning an optical entry window (1) of a fire detector (2), wherein an intermittent gas stream is discharged from at least one gas exit opening (7) onto the surface of the optical entry window (1) of the fire detector (2), wherein the intermittent gas stream having a number of pressure pulses (14) is discharged onto the optical entry window (1), and to an apparatus for cleaning an optical entry window. The method has the advantage that the optical entry window of a fire detector can be cleaned from contamination intermittently and corresponding to the intensity of contamination with a matched and low consumption of gas.

Abstract: A method for measuring a line resistance RL (7) and determining control line (16) faults in a hazard warning and control system. The control lines (16) connect a control device (20) to an actuator (10) using an actuation voltage UA in the case of an event and supplies the actuator (10) with a monitoring voltage UM in the case of a monitoring process using a monitoring module (21). Furthermore, the control device (20) has a constant current sink (6), which can be activated by a microcontroller (1), and a switchover device (5). In order to determine the line resistance RL (7), a constant voltage supply is provided in a measurement time interval ?tM by an energy store (9) integrated into the monitoring module (21) and is fed back to the control device (20), and the switchover device (5) deactivates the monitoring voltage UM supply from the control device (20) to the actuator (10) during the entire measurement time interval ?tM.

Abstract: A fire alarm consists of a housing in which sensors, a radiation source, and an optical window are disposed. A reflector protection basket or ring is disposed above the optical window. The basket or ring is suitable for protecting the optical window against mechanical influences, allows UV and IR radiation to pass through to a sufficient degree, and reflects UV and IR radiation from the housing interior, on its inside. Monitoring of the contamination of the window, function monitoring of the sensors and of the signal processing electronics, as well as easy replaceability of the components in the fire alarm are provided.

Abstract: A fire alarm consists of a housing in which sensors, a radiation source, and an optical window are disposed. A reflector protection basket or ring is disposed above the optical window. The basket or ring is suitable for protecting the optical window against mechanical influences, allows UV and IR radiation to pass through to a sufficient degree, and reflects UV and IR radiation from the housing interior, on its inside. Monitoring of the contamination of the window, function monitoring of the sensors and of the signal processing electronics, as well as easy replaceability of the components in the fire alarm are provided.

Abstract: An active line termination module for monitoring a line impedance of electrical systems, particularly for use at the ends of fire alarm lines, consists of a constant current sink with lighted display, a voltage regulator, and an intelligent electronic component disposed between the lines to be monitored, so that the intelligent electronic component is connected with the constant current sink by a line.