Locating the features and zone boundaries
Page 94
FiberPatrol FP1150 Product Guide
At Zone boundary locations
Tap the cable at the location of all soft zone boundaries.
Zone boundary and site feature identification (buried cable)
To draw the buried cable path on a map, and to accurately display the location of alarms, you must
determine the position of the site’s features and zone boundaries relative to the length of detecting
sensor cable. To accomplish this, one person goes along the cable path causing alarms at all site
features and zone boundaries, while a second person monitors the alarms in the control room.
Create a series of three alarms at each feature, and use the average value of the three test results
for the feature’s location. The tester requires a detailed site plan that clearly identifies each feature
and zone boundary that must be located for the map display. Print as many copies of the
Calibration Spreadsheet (Appendix c) as are required to calibrate (physically test) each feature
and zone boundary. Each designated soft zone boundary and feature should be marked on the
ground above the sensor cable. Photos or drawings of the zone boundaries and feature locations
should be provided for the tester. In addition, the tester should record the GPS coordinates of the
zone boundaries and features on the Calibration spreadsheets.
) proceed along the cable path conducting a series of 3
tamp tests to create 3 alarms at each feature and zone boundary, including:
•
the start and end location of each sensor;
•
the beginning and end of the lead cable running between the sensor unit and the detection
start point;
•
any significant bend or notable feature along the cable path;
•
all splice locations;
•
anywhere a surplus of fiber has been spooled;
•
any point that is approximately 3 km (1.86 mi.) from another calibration point;
•
the beginning and end of each soft zone (all zone boundaries).
Figure 106 Tap test location - service loops
Figure 107 Tap test location - zone boundaries
tap cable here
tap cable here
tap cable at zone boundary
Zone 1
Zone 2
