Siemens SITRANS LR250 Operating Instructions Manual page 121

Signal Processing (2.5.)
Note
Default settings in the parameter tables are indicated with an asterisk (*) unless explicitly
stated.
Near Range (2.5.1.)
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 187) for antenna heights.]
Values
Related parameters
Far Range (2.5.2.)
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 Low Calibration Pt. (2.3.7.1.) for an illustration.
Values
Related parameters
Use this feature if the measured surface can drop below the Low calibration point in normal
operation.
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC
Range: 0 to 20 m (0 to 65.6 ft)
Default depends on antenna type and process connection.
Examples:
Units (2.3.1.)
Range: Min. = Low Calibration Pt.
Max. = 23 m (75.45 ft)
Default: Value for Low Calibration Pt. + 1 m (3.28 ft)
Units (2.3.1.)
1.5" threaded horn 185.3 mm (7.3")
4" horn with stainless steel flange
100 mm (4") extension 373.3 mm (14.7")
Parameter reference
119