MRBP.425241.001 UM version 1.1 01.05.2022 FD 329/330-3-
1 «Vega»
8
5.2 Overall dimensions
Figure 2 - Overall dimensions of the detector with a mounting bracket
5.3 Construction
The detector housing is a flameproof enclosure, inside which all detector devices are
located, including sensitive elements that convert the electromagnetic radiation of the flame
into an electrical signal, electronic amplifiers and filters, digital-to-analog converters, a
microprocessor, display elements, optical elements for checking the operability of channels.
5.4 Principle of operation
The UV and IR sensors, when a flame is detected, convert electromagnetic radiation into
an electrical signal. Signals in digital form are processed in the microcontroller according to a
given algorithm to increase the reliability of the alarm output. The program highlights the
useful signal from the background, checks the correlation degree between UV and IR
channels. As a result of signal processing, a decision is made on the formation of output
signals: analog current output 4.20 mA, digital output in RS-485 standard with Modbus RTU
interface, “FIRE” relay contacts, “FAILURE” relay contacts.
FD 329/330-3-
1 «VEGA» detector is equipped with a special self-testing function, that
performs correct operation check automatically every 30 minutes. It does not require the use
of an external control source of radiation (test lamp). Successful completion of the automatic
check does not cause the d
etector to switch to the ‘‘Fire” mode.
