Appendix A: Site Survey for Wireless Probes
Sketches
A-4
• The RS-485 cable (Belden #3107A or equiv.) connecting the receiver to the TLS RF must be less than 250
feet.
• Avoid placing receiver near fluorescent lighting (min. 1 foot) or other source of electrical interference.
TLS RF UNIT LOCATION
You should choose a suitable location for the TLS RF unit, this would normally be within close proximity to the TLS
console, with consideration given to the following guidelines:
• The TLS RF unit must be protected from severe vibration, extremes in temperature and humidity, rain, and other
conditions that could harm computerized electronic equipment. Select a mounting location on the inside of the
same building housing the TLS console.
• The distance between the TLS RF unit and the receiver can not exceed 250 feet.
• Once you have tagged the ideal mounting position for the TLS RF unit and the receiver, measure the RS-485
cable run between the two. If the connecting cable’s length would exceed 250 feet, it would be better to move
the TLS RF unit’s mounting position closer to the receiver (i.e., within the 250 foot limit) since the receiver must
have close proximity (ideally line of sight) to the sump transmitter.
REPEATER LOCATION
You should choose a suitable location for each repeater, based on the following guidelines:
• The repeater is mounted in a vertical position so as to establish a line of sight between it and the transmitter in
the probe sump, and, if possible, between the it and the receiver as well.
• The most important concern is to ensure an unobstructed secondary path for data transmission between the
transmitters and receiver.
SITE CONDITIONS OR SPECIAL NEEDS
State any site conditions or special requirements that will be needed to complete the installation and
commissioning, for example:
• Suitable water pump for removing Manhole water
• Two men and specialist equipment for deep manholes
• Tower scaffold or ladders for fixing the repeater and receiver
• Additional lighting if working in dark rooms etc.
• Heavy or abnormal manhole covers
• Accessibility - Locked rooms, etc.
Sketches
The surveyor should produce sketches that show the locations of the transmitters, repeaters, receiver, TLS RF unit
and TLS console relative to each other. These sketches to include distances were appropriate, traffic flow and
parking areas for vehicles including fuel and other delivery vehicles to site.
