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IK-E343-001E
Fig. 1. DOP-6001 detector with prism reflector
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PRINCIPLE OF OPERATION
The DOP-6001 detector consists of an infrared (IR) light transmitter and a receiver located in a single
enclosure, and an interoperating separate E39-8R prism reflector or 4xE39-8R reflector panel. The detector
principle of operation consists in continuous analysis of optical air transparency in a space between the
detector and the reflector (reflector panel).
The detector can be in one of four modes: supervision, alarm, fault
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light beam break, and fault
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caused
by contamination. If a certain, defined quantity of aerosol (smoke) is found in the air, reducing optical
transparency below a set threshold, then the detector enters an alarm mode. Complete interruption of the
radiation beam (or its reflection due to an object occurrence in its optical path) is signalled as a fault,
because even the largest smoke concentration in the air does not cause an entire break of the detector
optical path. When the air is clear, the detector is in supervision mode.
Long lasting detector operation, especially in high dust level premises, may lead to contamination (dust
build-up) of optical parts of the detector and the reflector/reflector panel. In order to maintain constant
sensitivity and fire detection ability during a long time period, the detector is equipped with automatic
compensation circuits to monitor its contamination and environ impact conditions. The circuits ensure the
same sensitivity threshold in the whole compensation range. At a certain contamination level, the detector
signals a fault mode denoting a necessity to undertake servicing and cleaning works. However, even in this
mode, the detector is still able to detect smoke and initiate an alarm. A contamination caused fault requires
cleaning works of the reflector/reflector panel and the detector front surface. After cleaning, the detector
adjusts to new external conditions and automatically changes its mode from fault to supervision.
Communication between the POLON 4000 system control panel and the DOP-6001 detectors is provided
using a two-wire detection line. A unique, fully digital communication protocol enables transmission of any
information from the control panel to the detector and vice versa, such as: surrounding conditions
evaluation (smokiness, temperature), their change tendency and the current analogue value of
temperature and smokiness density.
The DOP-6001 addressable smoke detector is equipped with an internal short circuit isolator, which cuts off
the efficient detection line from a shorted section, what enables the detector further unfailing operation.
Analysis function in the DOP-6001 detector is fulfilled by a microprocessor. After the detector optical path
alignment and initiation the analysis process at the control panel level (detectors in an addressable line), or
pressing the START push button (detectors in a conventional line), microprocessor circuits analyses the
