Raytech TraceTek TTDM-128 - Introduction; The Tracetek TTDM-128 Network

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TTDM-128
User Manual
Introduction
The TraceTek TTDM-128 Network
The TTDM-128 can directly monitor up to 1500 m (5000 ft) of TraceTek sensor cables,
up to 150 TraceTek point sensors and networks of up to 127 external TraceTek modules
(which can include any combination of TTSIM sensor interface modules, up to 32
additional TTDM’s operating in slave mode or up to 10 TT-NRM network relay modules
or). With a fully implemented network, it is possible to monitor as much as 190 km (119
miles) of TraceTek sensor cable and provide as many as 320 discrete relays to handle a
wide variety of alarm and telemetry functions.
Each TTDM-128 provides:
▪ an internal Sensor Interface Module (SIM), capable of directly monitoring up to 1500 m
of sensor cable, 150 point sensors, or a combination of both cable and sensors
▪ 3 alarm relays, providing status for:
− Leak alarm
− Service required alarm
− System fault alarm
▪ Serial communication to a host computer, control system or building management
system using RS-232 or RS-485 hardware and the MODBUS™ protocol.
▪ Event history log
▪ Optional 4-20 mA output
When liquid is detected on any sensor, the TTDM-128 sounds an alarm, illuminates an
LED, closes relay contacts, and displays the channel number and location of the leak on
an LCD display. Each alarm event (leak, service, fault or other events) is logged into an
event history le. The event history le shows the type of event as well as the time and
date that the event occurred. This information is available to any host PLC or building
automation system via an RS232 or RS485 serial connection and the MODBUS protocol.
A simple system map (typically an as-built drawing of the sensor installation with reference
measurements) showing where the sensors have been installed is the only eld calibration
requirement.
Each individual sensor circuit detects, locates, and tracks leaks independently from
the other circuits in the leak detection system. There is no loss of sensitivity and no re-
mapping required after an initial leak is detected.
The TTDM-128’s internal SIM has been designed for use with the following TraceTek
sensing cables:
§ TT1000 (water)
§ TT3000 (Acids and Aqueous chemicals)
§ TT5000 (liquid hydrocarbon fuels and oils)
§ TT5001 (organic solvents)
A variety of TraceTek Point sensors, as well as contact closure devices such as oat
switches, can also be used with the TTDM-128.