User's Manual

Parameter reference
SITRANS LR250 (HART)
Operating Instructions, 01/2014, A5E32220602-AB
131
Signal Processing (2.8.)
Note
Default settings in the parameter tables are indicated with an asterisk (*) unless explicitly
stated.
Near Range (2.8.1.)
The range in front of the device (measured from the sensor reference point) within which any
echoes will be ignored. This is sometimes referred to as blanking or a dead zone. The factory
setting is 50 mm (2") past the end of the antenna, and the default is dependent on the antenna
type and process connection. [See Dimension drawings (Page 191) for antenna heights.]
Values
Range: 0 to 20 m (0 to 65.6 ft)
Default depends on antenna type and process connection:
Related parameters
Units (2.2.1.)
Far Range (2.8.2.)
Note
Far Range can extend beyond the bottom of the vessel.
Allows the material level to drop below Low Calibration Point without generating a Loss of Echo
(LOE) state. See
Sensor Mode (2.2.2.)
for an illustration.
Values
Range: Min. =
Low Calibration Pt.
Max. =
23
m (75.45 ft)
Default: Value for Low Calibration Pt. + 1 m (3.28 ft)
Related parameters
Units (2.2.1.)
Use this feature if the measured surface can drop below the Low Cal. Point in normal operation.