Epofat Tunnel Guard (ETnlG) is a stand-alone system designed to detect
any human moving within a tunnel made of steel reinforced concrete or
other materials. The system uses a single vertically mounted sensor
housed in an eight inch diameter protective durable PVC pipe that can be
lowered down a bore-hole next to the SRC tunnel. The sensor is then
connected to and powered from a surface control unit. Any human passing
by the sensor within the tunnel will immediately be detected and an
alarm indicated at the surface control unit. As for all Ralen Epofat
products the technology employed is harmless for operators and detected
individuals alike. The system will always detect the presence of any
living human being but will ignore any animal signature such as rats,
dogs, cats etc.
The sensor is operated from a control workstation situated on the surface in an appropriate booth or room. Alternatively all information can be relayed to another more suitable location for command and control purposes. All data from the sensor are stored centrally.
The system operates from any AC mains supply providing 230 Volts. In case of a power failure the system is backed up with a UPS.
a. Low voltage 12-24 VDC from AC line at 120VAC,60Hz, 1A max.
b. Other forms of power supply, by battery, can be designed after consultation
Temperature: -20°C to + 60°C
Humidity: 20% - 100%
135 kHz > 72 dB μA/m
up to 6m radius (variable)
capacity monopole, impedance 50 Ω
-13 dBm (EN 50371)
Protocol RS232/422 or 485
EN 300 330-1 v 1.3.1: 2001
EN 50 371
EN 50 357