Related Manuals for Siemens Cerberus DOT1151A-Ex
Summary of Contents for Siemens Cerberus DOT1151A-Ex
- Page 1 Cerberus® DOT1151A Ex Neural smoke detector, interactive, intrinsically safe Technical description Fire & Security Products Siemens Building Technologies Group...
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Page 3: Table Of Contents
Overview ............Characteristics . -
Page 5: Overview
Overview Dimensions Ø 115 47...70 incl. base DB1151A Characteristics D For application in explosion-hazard areas of zones 1 and 2 D Homogenous response behavior across a wide application spectrum through freely programmable percentages of smoke and heat D Efficient signal processing algorithms with downloadable, application specific characteristics for optimum detection reliability D High-quality sensor system with temperature compensation... -
Page 6: Design
Design The PolyRex detector DOT1151A-Ex is installed in a modern, attractive, impact-resistant plastic housing that fits unobtrusively into any room architecture. The detector is secured in the DB1151A base with a vibration-proof bayonet fitting. Except for the identification mod- ule that defines the installation location at the time the system is commissioned, the base does not contain any electronic components. -
Page 7: Technical Data
Technical data Normal ambient conditions, if nothing else is specified: Temperature T = 20°C (293K) Air pressure: p = 1’000hPa (750 Torr) Value Parameters Symbol Unit min. typ. max. Conditions Operating voltage 18.5 modulated µA ≤350 Operating current (quiescent condition) Capacity Detection line ≤33... -
Page 8: Algo-Parameter Sets For Dot1151A-Ex
Algo-Parameter sets for DOT1151A-Ex AlgoRex smoke sensitivity index (1) Response time Without temperature With full temperature when testing with Parameter set Operating state influence influence test gas (~seconds) present for danger level 3 with smoke APS083S APS083S absent 2) 3) special no response to smoke (only temperature... - Page 9 Note: all values are approximative ! Smoke sensitivity: To simplify the comparison of smoke sensitivities between the parameter sets, we are specifying an AlgoRex smoke sensitivity index for danger level 3. Please note, that this index is a relative figure, where ”2” means an increased sensitivity by a factor of 2 (compared to the parameter set with index ”1”);...
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Page 10: Design
Design The heart of the PolyRex detectors DOT1151-Ex is a high-quality opto electronic measure- ment chamber that screens off extraneous light but optimally detects light-colored and dark smoke particles. The light source, the light stop and the light receiver are arranged in such a way that the light from the source cannot directly reach the receiver (Fig. -
Page 11: Principle Of Operation (See Block Diagram Fig. 3)
Principle of operation (see block diagram Fig. 3) The PolyRex detector DOT1151-Ex measures the smoke density as well as the ambient air temperature. The temperature sensor signal can be evaluated either differentially and/or absolute. The smoke sensor sensor is based on the principle of light scatter. An infrared LED (IRED) transmits brief, intensive light pulses into the scattering chamber. -
Page 12: Self-Test / Function State
The external NTC temperature sensor is controlled by circuit element . It contains cir- cuit , which produces the bias voltage for this NTC and is simultaneously controlled and monitored by the µP. The signal from the NTC temperature sensor is taken via the filter the A/C converter of the µP. -
Page 13: Emergency Operation
Emergency operation If the PolyRex detector DOT1151-Ex can no longer be periodically addressed, for example due to a µP failure in the control unit, the detectors switch automatically to emergency op- eration. In the event of a fire this detector can still trigger a collective alarm. Response characteristics of the detector The PolyRex detector DOT1151-Ex is equipped with efficient algorithms for discriminating... -
Page 14: Adjustment Functions / Selection Of Parameter Sets
Adjustment functions / selection of parameter sets On the detector itself there is no mechanical adjustments. All function changes are initiated remotely by the control unit. The factory programs all detectors with a basic parameter set. This ensures that each detector is fully functional when it is installed. The additional param- eter sets can be programmed in the field with the service PC by downloading them from the control unit. -
Page 15: Application
Application Due to its EN54 compliance the PolyRex detector DOT1151-Ex can be used as an univer- sal detector. The recommended monitoring surfaces, detector spacing, etc. can be found in the national guidelines, the Cerberus planning and application guidelines (CRP), or the Security Guide. -
Page 16: Commissioning
Commissioning To prevent unnecessary soiling during the construction phase, the detectors should be in- serted into the bases just before the system is put into service. Each PolyRex DOT1151-Ex is connected in parallel to the two-wire detector bus. The address of the individual detectors is determined by the order in which the detectors are inserted, checked with the detector tester, or by entering the individual detector identification numbers. -
Page 17: Functional Check / Overhaul
11.2 Functional check / overhaul Through the detector self-test the DOT1151-Ex is subjected automatically to an extensive electrical function check. However, it is still necessary to conduct a physical function test on site in regular intervals. Recommendation: A visual check of the detectors must be performed periodically (usual- ly once per year). -
Page 18: Terms
Terms AlgoLogic Protected trade-mark (Algorithm + Logic) AlgoRex Interactive fire detection system with AlgoLogic Algorithm Special calculation method in the detector processor for optimizing the smoke sensitivity, noise immunity and reliability Algo Parameter-Set ASIC Application Specific Integrated Circuit CS11 Fire detection control unit AlgoControl to fire detection system S11 DB1151A Base for interactive DS11 fire detectors...