Tyco Tracetek - Tyco Thermal Controls
TraceTek Leak Detection TraceTek Design Guide
Design Guide – TraceTek Leak Detection
TraceTek leak detection systems can be utilised
in a variety of installations to detect water, chemical or fuel
leaks. TraceTek sensor cables detect and locate leaks along their
entire length. TraceTek point sensors detect leaks at a specific
point. Virtually any number of point sensors can be combined with
sensor cable on a leak detection single circuit.
The following information is provided for initial guidance only.
Complete product information, including selection guides, data
sheets, installation instructions and operating manuals, can be
downloaded from our website. Sensor Selection
The first design task is to select the most
appropriate sensor type based on the liquid to be detected and the
area to be monitored.
TT1000-POINT-PROBE should be selected for water
detection in areas requiring only a single point of detection, such
as drip trays under HVAC units. TT1000 sensor
cable should be selected for water detection in commercial building
applications where larger area coverage is required, such as under
raised floors in computer or telecom rooms, in building
service/utility areas, etc. TT3000 sensor cable
should be selected for aqueous chemical detection or for water
detection in double contained pipe systems. TT5000
sensor cable should be selected for fuel and oil detection.
TT5001 sensor cable should be selected for organic solvent
detection. TT7000 sensor cable should be selected
for strong acid detection. Sensor Layout
The next design task is to determine the optimum
sensor layout. The sensing cable or point probe should be positioned
so that leakage from the potential leak sources will contact the
sensor quickly, before reaching any critical equipment, cables or
other items to be protected. Perimeter Protection
– lay the sensing cable along the perimeter of the room, at a
minimum of 600 mm from the wall. Surface
Protection – lay the sensing cable in a serpentine pattern
(typically on a 1.2 to 2 meter pitch) to protect larger surface
areas. Around Equipment – lay the sensing cable
around equipment so that leaks can be detected before spreading out.
Interconnecting Separate Areas – jumper cables, branch connectors,
and weighted length modules can be used to connect sensors from
separate areas into a single circuit, as illustrated below:
Alarm Module Selection
Depending on the size of the leak detection
system and accessibility of the sensors, an appropriate alarm (or
alarm and locating) module must be selected.
Small Area Circuits – for small leak detection
circuits (normally those less than 40 meters of sensor cable in a
single area), a simple alarm module may be selected. The TraceTek
TTC, TTA-S IM and SZA modules provide local indication of the system
operating status via LEDs, plus voltage-free contacts for remote
connection to external alarm signals, remote annunciation panels, or
building management systems. A typical circuit is shown below:
Large Circuits, Concealed Sensors, or Separated Areas – for large
circuits (normally more than 40 meters or where sensors are
distributed between several separate areas) or installations where
the sensor is concealed and normally inaccessible, an alarm and
location module is most appropriate. The TTDM-128 provides
voltage-free alarm contacts, 4-20 mA output, and digital
communication via simple RS-485 wiring and the ModBus protocol.
Alternatively, TTSIM modules can be connected either to the TTDM-128
or directly to a building management system via RS-485 wiring. The
TTSIM supports ModBus and Johnson Controls Metasys protocols
directly, providing complete sensor status and leak location
information digitally to the host system. The TTDM-128 can be
connected to as many as 128 TTSIMs via a single RS-485 network,
allowing extremely large leak detection systems to be easily
configured and integrated.
Accessories
A variety of accessories are available to
complete your system and make installation easy. Most accessories
must be specified with type PC (for use with TT1000 sensors) or type
MC (for use with all other sensors) connectors.
TT-MLC modular leader cable – used to connect sensor circuits to
alarm modules. TT-MJC modular jumper cable – used
to interconnect sensor circuits. TT-MBC modular
branch connectors – used to layout circuits in a variety of branched
configurations. TT-WL weighted length – provides
an artificial circuit length of 4.5 meters, in order to clearly
separate sensor sections that are on the same circuit but in
different areas.
TT-MET modular end termination, required at the
end of each sensor circuit. TT-TAG – plastic tags
used for clearly identifying TraceTek sensors, and for tagging
mapping data on the sensor. TT-HDC – hold down
clips, available in two sizes: ¼ inch for TT1000 and TT3000 sensors,
and ½ inch for TT5000 and TT5001 sensors.
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