General Description
System Description and Operation, AutroSafe Maritime Gas Detection, 116-P-BS420MG/XGB, Rev. E, 2019-12-10,
Autronica Fire and Security
Page 11
4.7 Detectors and Field Devices
4.7.1 Gas Detectors
IR point Gas Detectors etc. connect to PowerLoop modules, type
BSD-340, each of which are capable of handling up to a maximum of
15 detectors on each PowerLoop, depending on the power
consumption of the field equipment and the loop topology. The two-
wire PowerLoop provides intelligent communication and DC power to
the detectors.
4.7.1.1 IR Point HC Gas Detectors
The AutroPoint Maritime Gas Detector is fully integrated by means of
built-in intelligent interface featuring a self-test function. The detector
can transmit analogue information and can also provide maintenance
data.
4.7.1.2 Toxic Gas Detectors
AutroTox Gas Detectors are connected to the PowerLoop by means of
a 4-20mA interface unit, type BN-342. Hot swapable sensor cells for
various gas types.
4.7.1.3 Other 4-20 mA units
Any 4-20mA process transmitter unit can be connected to the
AutroSafe PowerLoop via an BN-342 unit. Intelligent detectors with
internal self-diagnostics are able to provide a general fault signal via
the 4-20mA signal transferal in case of a malfunction.
4.8 PowerLoop Driver BSD-340
4.8.1 Description
The PowerLoop Driver BSD-340 functions as a protocol converter
between AutroFieldBus and PowerLoop. It consists of a PowerLoop
interface for power and communication, and an AutroFieldBus
interface towards an AutroFieldBus Driver
(AutroSafe panel internal).
The PowerLoop is a two-wire bus capable of delivering 30VDC/ 100W
connected in ring topology and is galvanically isolated from the rest of
the system. The PowerLoop interfaces detectors and other loop units
including a 4-20mA interface.
The BSD-340/1 provides a service port which is used for
commissioning and maintenance.
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