The TTSIM-2 Sensor Interface Module monitors up to 150 meters (500 feet) of TRACETEK sensing cable. When liquid is detected, the TTSIM-2 unit indicates the leak, displays the location of the leak and switches a relay to provide local voltage-free contact closure. The TTSIM-2 can also communicate to a host monitoring system such as a TRACETEK TTDM-128 or directly to a PLC or other host system using standard protocols. The low cost of the TTSIM-2 makes it economical to build very robust systems with many small independent sensing cable segments. No field calibration is required. The TTSIM-2 can be used as a stand-alone leak detection alarm unit, or in networks with other TRACETEK TTSIM, TT-NRM or TTDM-128 modules. The TTSIM-2 can be configured using a Microsoft Windows™ based PC, or a TRACETEK TTDM-128 network master module.