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.

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