Position Leak Detection System Positioning Controller Water Leak Detection Cable

1. TECHNICAL SPECIFICATIONS
AIR CONDITIONING & MECHANICAL VENTILATION INSTALLATION
TS/A/40/1
SECTION 40 – WATER DETECTION SYSTEM
1 General
1.1 This section sets out the requirements for water detection system and
covers the supply, delivery, installation, testing and commissioning
and twelve (12) months free maintenance and warranty of the system
and associated equipment.
1.2 The system components shall be designed to be installed according to
pre-test limitations as approved or listed by a recognised testing
laboratory.
1.3 All devices shall be designed for service encountered and shall not be
readily rendered in-operative or susceptible to accidental operation.
They shall be located, installed or suitably protected against
mechanical, chemical or other damage, which may render them in-
operative. All devices for activating supplementary equipment shall be
considered as integral parts of the system and shall function with
system operation.
1.4 The complete system shall include electronics alarm module, sensing
cable, graphic display map, and auxiliary equipment, as indicated on
the design drawings. The system shall simultaneously detect the
presence of water at any point along the cable's length and activate
the module's leak alarm relays. The sensing cable shall be of such
construction that no metallic parts shall be exposed to the
environment. The system shall be provided with pre-connectorised
sensing cable components.
2 Alarm Locator Module
2.1 The alarm module shall be capable of monitoring up to 1500 meters of
sensing cable.
2.2 The alarm module shall have LEDs indicating "power" (green), "alarm"
(red), and "continuity" (yellow). The system shall sound an audible
alarm upon sensing a leak. Once the alarm condition has been
cleared, the module is reset with a single keystroke.
2.3 Basic Features of the alarm locator module
 In addition to detecting leaks, the system shall warn of fault
conditions and indicates when maintenance is required.
 An event history log allows leaks (and other events) to be
tracked.
 The settings can be customised to suit the user’s application.
 Both the events history log and any user settings are held in
non-volatile memory.
 The unit shall has an in-built system-wide diagnostic functions

2. TECHNICAL SPECIFICATIONS
AIR CONDITIONING & MECHANICAL VENTILATION INSTALLATION
TS/A/40/2
2.4 The alarm module will be powered by 240 VAC. The module shall
have a pair of contacts open on an alarm, and a pair of contacts close
on an alarm. These contacts shall be used to actuate other alarms
and shall be capable of switching 10 amps at 250 VAC.
2.5 In additions, the module shall be provided with 4-20 mA signal and
RS232/RS-485 series port for connection to building management
system.
2.6 The module enclosure shall be NEMA 1, constructed of 16- gauge
steel with dimensions of 8" x 8" x 4". The enclosure shall be capable
of either semi-flush of surface mounting.
3 Sensing Cable
3.1 The water sensing cable shall detect the presence of water and other
conductive fluids. The cable shall consist of four wires: two sensor
wires, a continuity wire, and a return wire. All four wires shall be
coated or insulated with fluoropolymer and would helically around a
central fluoropolymer core.
3.2 Cables using exposed metal or non-fluoropolymer constructions shall
not be acceptable. The cable, including connectors, shall have a
breaking strength of at least 70 pounds as per ASTM D-638. The
cable shall have an abrasion resistance of >65 cycles as per UL 719.
3.3 The cable shall be UL-listed to UL 910, Test Method for Fire and
Smoke Characteristics of Electrical and Optical-Fibre Cables used in
Air-Handling Spaces, and shall be of class 2 plenum cable as per NEC
725-51 (a).
4 Accessories
A complete system accessories (jumper cable, end terminations etc) shall be
provided by the system manufacturer.
5 Performance
5.1 Leak Size Required To Alarm
Maximum wetted length of cable required to produce an alarm with tap
water shall be no greater the 1 inch. Sensitivity shall be adjustable at
the module.
5.2 Continuous Coverage
The system shall provide continuous, distributed coverage of the area
to be protected. Spot or point sensors are not acceptable.

3. TECHNICAL SPECIFICATIONS
AIR CONDITIONING & MECHANICAL VENTILATION INSTALLATION
TS/A/40/3
5.3 Supervision
The system shall be continuously monitored for continuity. The loss of
continuity in any of the wires shall cause an alarm to sound and
energise the continuity LED.
5.4 Cleaning
If required, cleaning the cable without removing it shall be possible
using a damp cloth.
5.5 Drying
The cable shall dry and reset at the module within 15 seconds of
removal from free water. No shaking, wiping, air-drying, or other
mechanical action shall be required to dry the cable.
5.6 The alarm panel shall have a voltage free-contact (NO/NC) for
external interfacing.
5.7 Provide a current transmitter that capable of providing 4 - 20 mA
signal.
The current transmitter allows the transfer of leak location of continuity
fault information from the water alarm module to any instrument
capable of interpreting a 4 - 20 mA analogue signal.
6 Testing and Commissioning
6.1 The completed installation shall be in full operational condition before
testing is to be carried out. The Contractor shall commission the entire
installation in the presence of the S.O. and manufacturer’s
representative. Test results shall be recorded and certified by the
Contractor and the manufacturer’s representative.
6.2 The Contractor shall provide all equipment, labor and materials
necessary.
6.3 All defects and deficiencies in performance, reliability, safety,
efficiency, appearance of finish shall be rectified and resettled by the
Contractor to the entire satisfaction of the S.O. before acceptance.
6.4 The Contractor shall on commissioning conduct an instructional
briefing to the users concerned on the safe and proper use of the
system and necessary evacuation drills in the event of an agent
discharged.