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A-49
IM 39J06B40-01EN 14th Edition: May 30, 2022
A5.4.2. Routing Sensor optical fibers
Sensor optical fibers used must meet the DTSX3000 specifications and be routed in
compliance with the cable specifications.
Observe the following general precautions when routing a sensor optical fiber:
- The sensor optical fiber must not be subjected to excessive stress or bending
beyond cable specifications. Excessive stress or a tight bending radius may result
in sensor optical fiber loss (bending loss). Bending loss is also affected by the
ambient temperature and other conditions. Excessive sensor optical fiber loss may
result not only in performance degradation but also unstable distributed
temperature measurement with the DTSX3000.
- Beware that the minimum bending radius and maximum allowable stress vary with
sensor optical fiber conditions.
- Do not contort or twist the sensor optical fiber. Excessive torsion or twist may result
in sensor optical fiber loss (bending loss).
- The sensor optical fiber must be free of reflection. sensor optical fiber splicing must
be by fusion splicing and the far end of the cable must be processed (e.g., cut at an
angle) to prevent reflection.
Sensor optical fiber connection loss must be 0.3 dB max. per splice point and no
more than 0.15 dB on average.
- Provide an extra length of the sensor optical fiber near the DTSX3000 and reserve
enough space to accommodate the extra length.
It will be easier to connect a sensor optical fiber to the DTSX3000 if about one turn
of extra cable length is provided near the DTSX3000.
- If the DTSXL System is to be installed in a cabinet, provide adequate space within
the cabinet for routing the sensor optical fiber. More space is needed for routing
additional sensor optical fibers if the optical switch module is used with the DTSXL
System in the cabinet.
- Before connecting a sensor optical fiber to the DTSXL System, form the cable
optimally so that it will not be subjected to stress when connected to the DTSXL
System.
Sensor Optical Fiber
Uniform temperature
section (optional)
Far
Near