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Transmitters
Remote transmitters
The Remote Transmitter is used to convert data from the plant,
manifold etc. into the multiplexed signal which is carried around the alarm
system on the 2 core signal cable. The integrity of the cabling between plant
or manifold and the transmitter is monitored. A fault on this cable will cause
the signal(s) affected by the fault to fail to alarm condition. An internal LED
will also flash to indicate that a cable fault is present. The Remote
Transmitter is available in 1 - 4 gas forms. Installation
requirements. A 230 Vac supply, fused at 3 amps, fed from the essential
supply. Screened cable (minimum 0.5mm) from plant or manifold to the Remote
Transmitter (1 core per signal +common), maximum 100 metres A 2 core
screened cable (minimum 0.5mm) connecting the Remote Transmitter to the alarm
system data cable.
Internal Transmitters
The Internal Transmitter is used to convert data from the plant,
manifold etc. into the multiplexed signal which is carried around the alarm
system on the 2 core signal cable. It is used where an SDX-15 alarm panel is
installed within the plant or manifold room & is fitted within the alarm
panel. The integrity of the cabling between plant or manifold and the
transmitter is monitored. A fault on this cable will cause the signal(s)
affected by the fault to fail to alarm condition and a system fault lamp to
flash on the SDX-15 alarm panel. Pressing the Test button on the alarm whilst
this cable fault is present will cause a number 4 to show on the display below
the system fault lamp, enabling easy fault diagnosis. The Internal Transmitter
is available in in 1 - 4 gas forms. Installation requirements. An
SDX-15 alarm panel. Screened cable (minimum 0.5mm) from plant or manifold to
the Internal Transmitter (1 core per signal +common)., maximum 100 metres
Plant to Alarm Interface
The Plant to Alarm Interface fulfils the requirements of HTM2022
for a plant to alarm interface (now known as an Alarm Signal Status Unit) as
follows:- Power On lamp. Monitoring of the integrity of the cabling
between plant, manifold etc. & causing the signal(s) affected by the fault
to fail to alarm condition and a system fault lamp to flash. Volt-free,
normally closed, contacts for each alarm condition for connection to an alarm
system.
It also has an integral one gas transmitter converting the
alarm conditions into the multiplexed signal which is carried around the alarm
system on the 2 core signal cable, allowing an SDX-15 alarm system to operate
from the transmitter and another alarm system to operate from the contacts.
Installation requirements. A 230 Vac supply, fused at 3 amps, fed from
the essential supply. Screened cable (minimum 0.5mm) from plant or manifold
to the Remote Transmitter (1 core per signal +common), maximum 100 metres A
2 core screened cable (minimum 0.5mm) connecting the Remote Transmitter to the
alarm system data cable.
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