Installation Specifications - Wavetronix SmartSensor Advance Manual

Installation specifications

1.0 General. This item shall govern the installation of an aboveground continuous tracking advance detector (CTAD) equivalent to the
Wavetronix SmartSensor Advance.
CTAD can provide accurate, consistent, and reliable data provided they are installed properly. The requirements in this specification are
intended to ensure proper CTAD installation.
2.0 Mounting and installation.
2.1 Mounting assembly. The CTAD shall be mounted directly onto a mounting assembly fastened to a pole, overhead mast arm, or
other solid structure. In qualifying tethered (double) span wire intersections, the mounting assembly may be fasted to a hanger assem-
bly that is affixed to the span wire.
The CTAD mounting assembly shall provide the necessary degrees of rotation to ensure proper installation.
The CTAD mounting assembly shall be constructed of weather-resistant materials and shall be able to support a 20-lb. (9.1-kg) load.
2.2 Mounting location. The CTAD shall be mounted at a height that is within the manufacturer's recommended mounting heights.
The CTAD shall be mounted at an offset from the center of the lanes of interest that is consistent with the CTAD's maximum offset.
The CTAD shall be mounted in a forward-fire position, looking towards either approaching or departing traffic.
The CTAD shall be mounted so that it is pointed within 10 ft. (3 m) of the target point as defined by the manufacturer's table of target
points for mounting offsets and mounting heights.
The CTAD shall be mounted so that its vertical center line is within 5 degrees of the lanes of interest as described the manufacturer's
documentation.
Aligning the CTAD's center line with the roadway ensures that the antenna beam of the CTAD is positioned along the roadway.
Two CTAD units shall not be mounted so that they are pointed directly at each other.
CTADs that are mounted within 20 ft. (6.1 m) of each other shall be configured to operate on different RF channels regard-less of the
pointing direction of the CTAD.
The CTAD shall not be installed in areas with overhead structures. For example, overhead sign bridges, tunnels and overpasses should
be avoided. The CTAD shall be mounted at least 30 ft. (9.1 m) to the side of any such overhead structures.
2.3 Cabling. The cable end connector shall meet the MIL-C-26482 specification and shall be designed to interface with the appropri-
ate MIL-C-26482 connector. The connector backshell shall be an environmentally sealed shell that offers excellent immersion capa-
bility. All conductors that interface with the connector shall be encased in a single jacket, and the outer diameter of this jacket shall
be within the backshell's cable O.D. range to ensure proper sealing. The backshell shall have a strain relief with enough strength to
support the cable slack under extreme weather conditions. Recommended connectors are Cannon's KPT series, and recommended
backshells are Glenair Series 37 cable sealing backshells.
The cable shall be the Wavetronix SS-704-xxx or an equivalent cable that conforms to the following specifications:
• The RS-485 conductors shall be a twisted pair.
• The RS-485 conductors shall have nominal capacitance conductor to conductor of less than 40 pF/ft at 1 kHz.
• The RS-485 conductors shall have nominal conductor DC resistance of less than 16.7 ohms/1000 ft. (304.8 m) at 68°F (20°C).
• The power conductors shall be one twisted pair with nominal conductor DC resistance of less than 11.5 ohms/1000 ft. (304.8 m) at
68°F (20°C).
• Each wire bundle or the entire cable shall be shielded with an aluminum/mylar shield with a drain wire.
The cable shall be terminated only on the two farthest ends of the cable.
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