Technical Documentation: Fire Detectors used in hazardous areas
P-DET/EX/RCE/PM5/GKa/110995 24 Autronica Fire and Security AS
3 Conventional system type BX-40
3.1 Zener barrier unit type BZ-20/S
Barrier unit BZ-20/S is mainly intended to be used together with Autronica
conventional fire alarm systems. The main component is one ac-barrier (see
page 12) for each branch for connection of detectors in hazardous area.
Each unit may contain one or two ac-barriers, and may consequently be loaded
with the same number of loops as the unit contains ac-barriers.
Each loop may take up to ten detectors.
The type indication includes the number of acceptable branches, indicated by a
digit placed behind a diagonal at end of the indication.
E.g. BZ-20/2S means that the maximum number of loops which may be
connected to this unit is 2.
Note!
Units listed below only, may be connected to the zener barrier unit type
BZ-20/nS. (n being the number 1 or 2).
Smoke detector, ion-chamber type BJ-20B/Ex
Heat detector type BE-26M/Ex
Heat detector type BE-27M/Ex
Manual call-point type BF-21M/Ex
Heat detector type BD-26/Ex (BE-26/Ex)
Heat detector type BD-27/Ex (BE-27/Ex)
The detectors may, as described above, be connected to one loop in number of
maximum 10 units.
1)
1)
This is purely estimated from an electro-technical point of view. Other
criterias to be estimated are gas and total capacitance, C
eq
.
Conventional
system type
BX-40
Zener barrier
unit type BZ-20/S
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