Class 1 Medical Device: Medical Gas Pipeline Systems
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The SDX-RTX transmitter links to the SDX-15 Alarm system via 2-core data bus cable.
4no input signals are wired from each gas (plant or manifold), via an end-of-line termination board, knowns as a TB4 PCB (optional).
Each gas requires upto a 5-core cable (4no switched conditions and 1no Common) and up to 4no gases can be in-putted via 1no SDX-RTX
Transmitter PCB requires a 230vac supply.
All supply, input and data-bus terminations are via simple 45deg PCB mounted terminals.
The SDX-RTX is manufactured in a 1, 2, 3 or 4 channel (gas) variation, to suit the customers needs.
These transmitters can also be upgraded to add or delete channels without the need to re-install new/additional enclosures and supplies.
The transmitter incorporates a single channel selector switch which determines the transmitted channel for the first gas (marked on the PCB as Service A). Where additional gases are required, the SDX-RTX will transmit as follows:
Service A – Transmitted on channel selected by rotary switch (channel always used)
Service B – Transmitted on channel selected by rotary switch plus 1, (used on one and two gas variations only)
Service C – Transmitted on channel selected by rotary switch plus 2, (used on one, two and three gas variations only)
Service D – Transmitted on channel selected by rotary switch plus 3, (used on four gas variation only)
The SDX-RTX transmitter receives 4no analogue signals from up to 4no gases (plant or manifold) and then transmits these signals via a 2-core data-bus using Shire Controls own Medcon signal protocol. A single 2-core data-bus can transmit up to 60 status conditions (15no gases, each with up to 4no condition) and channels are determined via hexadecimal (16 way) rotary switches for transmitting (via SDX-15 transmitters) and receiving for display purposes (via SDX-15 Plant Alarms) or for interfacing to others (via SDX Computer Interfaces).
For monitoring of input signal wiring, a termination box is required to be mounted as close as practical to the gas source. The integrity of the cabling between the gas source and the SDX-RTX is monitored, and a fault on this cable will result in visual system fault warning, with all affected alarm conditions going into alarm condition.
Monitoring of the data-bus connection is always in operation. The transmitter looks to receive a strobe signal from the designated ‘Central Panel’ (the 24-hour monitored SDX-15 Plant Alarm), which ensures the system data-bus integrity. Any short-circuit, open-circuit or non-presence of a Central Panel will result in the transmitter giving a visual warning of this system fault.
As the system is addressable, ALL SDX-15 system equipment (Alarms, Transmitters and Interfaces) can be added/removed or relocated within the system. This simply requires the 2-core data-bus to be extended from the nearest existing SDX-15 Unit, or tee-ing off from a nearby existing cable run. Use 2-core screened cable (minimum 0.5mm).
PCB LED Indicators:
SDX-RTX has 3 5mm round LED indicators – Green, Yellow and Red:
- Green – This LED shows that the 8vdc control voltage is present on the PCB. In order for this LED to be ON, the following are OK:
Both the glass 315ma and 230vac 250ma ceramic fuses.
PCB transformer and rectifier circuit.
230vac is present.
- Red – This LED will be OFF if the system is functioning. The LED will flash if any of these occur:
There is a short circuit anywhere on the 2-core data-bus cable.
There is an open-circuit on the 2-core data bus cable between the designated ‘Central Panel’ and the SDX-RTX Transmitter.
The designated ‘Central Panel’ has been switched off (i.e. has neither power nor battery back-up operating).
The designated ‘Central Panel’ has is set-up as a ‘Repeater’ or the Control PCB has been unplugged.
- Yellow – This LED will be off if the system is functioning. The LED will flash if any unused input connections are NOT linked out to common via a 56K or 1K8 0.25watt resistor.
A 230 vac supply, fused at 3 amps, fed from the essential supply
A 2-core screened cable (minimum 0.5mm) to SDX-15 data-bus.
A 5-core screened cable from each input gas connected (max. 4 gases).
All screens to be earthed at BOTH ends.
Warranty: alarms returned to our works which have failed due to faulty parts or manufacture will be repaired (or replaced) without charges for parts and labour.
10 year compatibility warranty: Install the SDX Plant Alarm System with the confidence that equipment will be available to modify or extend the system for at least 10 years.
HTM 02-01 compliant
When ordering, please specify the following format:
x = number of gases (1,2,3 or 4)
If possible, the hospital in which the alarm is to be installed.