User's Manual

Remote operation
7.1 Operating via AMS Device Manager
SITRANS LR250 (FOUNDATION FIELDBUS)
Operating Instructions, 01/2014, A5E32221411-AB
85
Echo Select
[see
Echo Select (2.5.7.)
]
● Algorithm [see
Algorithm (2.5.7.1.)
]
● Position Detect [see
Position Detect (2.5.7.2.)
]
● Echo Threshold [see
Echo Threshold (2.5.7.3.)
]
● CLEF Range [see
CLEF (Contrained Leading Edge Fit) Range (2.5.7.4.)
]
Sampling
[see
Sampling (2.5.8.)
]
● Echo Lock [see
Echo Lock (2.5.8.1.)
]
● Sampling Up [see
Up Sampling (2.5.8.2.)
]
● Sampling Down [see
Down Sampling (2.5.8.3.)
]
Echo Quality
[see
Echo Quality (2.5.9.)
]
● Confidence [see
Confidence (2.5.9.1.)
]
● Echo Strength [see
Echo Strength (2.5.9.2.)
]
● Noise Average
Displays the average ambient noise (in dB above 1 μV rms) of a noise profile. Noise level is a
combination of transient noise and receiving circuitry. After a measurement, the values from
the previous noise shot will be displayed.
TVT (time varying threshold)
A time-varying curve that determines the threshold level above which echoes are determined to
be valid.
Modify the TVT to screen out false echoes [see Time Varying Threshold (TVT) (Page 231
), and
Auto False Echo Suppression (2.5.10.1.)
].
Navigate to
Configure/Setup > LTB > Setup > Signal Processing
and click on
TVT
. Click on one
of the two tabs to access the parameters listed:
TVT Setup
● Auto False Echo Suppression [see
Auto False Echo Suppression (2.5.10.1.)
]
● Auto False Echo Suppression Range [see
Auto False Echo Suppression Range (2.5.10.2.)
]
● Hover Level [see
Hover Level (2.5.10.3.)
]
● Shaper Mode [see
Shaper Mode (2.5.10.4.)
]