Page 119 - E24 Electrical Notebook

Leak Detection / Design Guide - 115

Design Guide – TraceTek Leak Detection The TraceTek TTC, TTA-S IM and SZA modules provide local indication
of the system operating status via LEDs, plus voltage-free contacts for
TraceTek leak detection systems can be utilised in a variety of installations remote connection to external alarm signals, remote annunciation panels,
to detect water, chemical or fuel leaks. TraceTek sensor cables detect or building management systems. A typical circuit is shown below:
and locate leaks along their entire length. TraceTek point sensors detect
leaks at a specific point. Virtually any number of point sensors can be Large Circuits, Concealed Sensors or Separated Areas – for large
combined with sensor cable on a leak detection single circuit. circuits (normally more than 40 meters or where sensors are distributed
between several separate areas) or installations where the sensor is
The following information is provided for initial guidance only. Complete concealed and normally inaccessible, an alarm and location module is
product information, including selection guides, data sheets, installation most appropriate. The TT-TS12 provides voltage-free alarm contacts,
instructions and operating manuals, can be downloaded from our website. 4-20 mA output, and digital communication via simple RS-485 wiring and
the ModBus protocol.
Sensor Selection Alternatively, TTSIM modules can be connected either to the TT-TS12 or
directly to a building management system via RS-485 wiring. The TTSIM
The first design task is to select the most appropriate sensor type based supports ModBus and Johnson Controls Metasys protocols directly,
on the liquid to be detected and the area to be monitored. providing complete sensor status and leak location information digitally
to the host system. The TT-TS12 can be connected to as many as 128
TT1000-POINT-PROBE should be selected for water detection in areas TTSIMs via a single RS-485 network, allowing extremely large leak
requiring only a single point of detection, such as drip trays under HVAC detection systems to be easily configured and integrated.
units.
Accessories
TT1000 sensor cable should be selected for water detection in
commercial building applications where larger area coverage is required, A variety of accessories are available to complete your system and make
such as under raised floors in computer or telecom rooms, in building installation easy. Most accessories must be specified with type PC (for
service / utility areas, etc. use with TT1000 sensors) or type MC (for use with all other sensors)
connectors.
TT3000 sensor cable should be selected for aqueous chemical detection TT-MLC modular leader cable – used to connect sensor circuits to alarm
or for water detection in double contained pipe systems. modules.
TT-MJC modular jumper cable – used to interconnect sensor circuits.
TT5000 sensor cable should be selected for fuel and oil detection. TT-MBC modular branch connectors – used to layout circuits in a variety
of branched configurations.
TT5001 sensor cable should be selected for organic solvent detection. 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
TT7000 sensor cable should be selected for strong acid detection. but in different areas.
TT-MET modular end termination – required at the end of each sensor
Sensor Layout circuit.
TT-TAG plastic tags used for clearly identifying TraceTek sensors, and
The next design task is to determine the optimum sensor layout. The for tagging mapping data on the sensor.
sensing cable or point probe should be positioned so that leakage from TT-HDC hold down clips – available in two sizes: ¼ inch for TT1000 and
the potential leak sources will contact the sensor quickly, before reaching TT3000 sensors and ½ inch for TT5000 and TT5001 sensors.
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:

Modular branch Modular sensing
connector cable

Alarm Modular jumper Modular jumper Modular end
module cable cable termination

Modular leader
cable

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.

Authorised Distributor: Tel : 01403 216100
Aquilar Ltd Fax : 08707 940320
Weights & Measures House Website : www.aquilar.co.uk
20 Barttelot Road Horsham Website : www.tracetek.com
West Sussex RH12 1DQ Email : info@aquilar.co.uk