TTDMâNMM and - California Detection Systems
TTDMâNMM and - California Detection Systems
TTDMâNMM and - California Detection Systems
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Network of TraceTek TTDM-NMM <strong>and</strong> TTDM-SIM Modules<br />
The network of TTDM-NMM <strong>and</strong> TTDM-SIM modules adds capabilities beyond those<br />
of a st<strong>and</strong>-alone TraceTek TTDM single-channel alarm <strong>and</strong> locating module. Note that<br />
a separate operation <strong>and</strong> maintenance manual is available for the st<strong>and</strong>-alone single<br />
channel system (Raychem document H55472).<br />
In a network of TTDM-NMM <strong>and</strong> TTDM-SIM modules, each TTDM-SIM Sensor<br />
Interface Module (<strong>and</strong> the Sensor Interface board in the TTDM-NMM Network Master<br />
Module) can independently monitor up to 5000 ft (1500 m) of sensing cable. If liquid<br />
contacts sensing cable connected to a Sensor Interface Module, that module communicates<br />
the alarm condition to the TTDM-NMM Network Master Module, which signals<br />
an alarm, displays the distance to the leak, <strong>and</strong> records the event. The TTDM-NMM<br />
communicates with the SIMs over an RS-485 network (which uses a shielded, twisted<br />
pair); see Appendix 5 for wiring details. The RS-485 address for each SIM is assigned<br />
using the TTDM-NMM system software.<br />
A TTDM-NMM Network Master Module can monitor up to 15 TTDM-SIMs, allowing a<br />
maximum of 80,000 ft (24,000 m) of sensing cable in a single system. In addition,<br />
each TTDM-NMM has an assignable RS-485 address, which allows a host system to<br />
monitor up to 31 TTDM-NMM leak detection systems.<br />
TTDM-NMM<br />
Network<br />
Master<br />
Module<br />
RS-485<br />
2-wire<br />
network<br />
TTDM-SIM<br />
Sensor<br />
Interface<br />
Module<br />
3
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