YOKOGAWA DTSXL, User Manual, Page: 167 / 289

< PART – B Software >
B-84
IM 39J06B40-01EN 14th Edition: May 30, 2022
- Masking
When a fiber failure is detected, it masks temperature in the range where
temperature cannot be measured due to fiber failure.
OFF : does not mask.
999 degC : masks temperature to +999 degC.
-273 degC : masks temperature to -273 degC.
Tip
- Masking is effective when DTSX3000 firmware R1.06.01 or later and DTAP3000 R1.06.01 or later
versions are combined.
- Masking is enabled when Fiber Failure Detection is selected as On.
- Increased Loss Detection
Specify the condition for increased loss detection. If On is selected, an increased
loss alarm is generated if the CFL level near the far end of the sensor fiber falls
below the specified [Threshold] (detection threshold value) during measurement.
Specify a threshold level from -99.9 [dB] to 0.0 [dB] in units of 0.1 [dB].
If On is not selected, increased loss detection is not done.
Tip
An increased loss alarm is generated if the CFL level near the far end (at position [Fiber End] - X [m])
of the sensor fiber falls below the specified Threshold Level, where X varies with [Fiber End] (length).
<Reference> 0
～
10 km : X=10 [m], 10
～
20 km : X=20 [m], 20
～
30 km : X=30 [m], 30
～
40 km : X=40
[m], 40
～
50 km : X=50 [m]
B7.3.1. Fiber Settings
These parameters are required for calculating temperature from the measurement
result.
- Optical Switch Exit Position
Define the exit position of the optical switch relative to the DTSX3000 exit position,
which is taken as 0 m. Specify a value from 0.0 [m] to 50000.0 [m] in units of 0.1
[m].