Far Range (2.2.5.); Auto Sensor Offset (2.2.6.) - Siemens SITRANS L 7ML5400 Operating Instructions Manual

9.2.2.5

Far Range (2.2.5.)

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 (2.1.2.) (Page 173) for an illustration. Defined in Units
(2.1.1.) (Page 172).
Options
Use this feature if the measured surface can drop below the Low Calibration Point in normal
operation.
9.2.2.6

Auto Sensor Offset (2.2.6.)

Note
Auto Sensor Offset supports adjustments to distance value only.
Calibrates actual distance if reported value is consistently high or low by a fixed amount.
(Adjusts distance measurement by a fixed amount.) Defined in Units (2.1.1.) (Page 172).
Options
Before using this feature, verify the following parameters are correct:
• Low Calibration Point (2.2.1.) (Page 176) (or Zero Head Offset (2.15.3.5.) (Page 237), if
using OCM)
• Process Temperature (2.12.1.2.) (Page 222)
• Sensor Offset (2.2.3.) (Page 176)
A correction to any one of these parameters may resolve the issue and an Auto Sensor Offset
calibration may not be necessary.
Using Auto Sensor Offset:
Begin with a steady distance at a known low distance value (low distance value equates to a
high level value).
1. Review the distance measurement via LUI for approximately 30 seconds to verify
repeatability.
2. Measure the actual distance (for example, with a tape measure).
3. Enter the actual distance, defined in Units (2.1.1.) (Page 172).
The deviation between the calculated and the actual distance value is stored in Sensor Offset
(2.2.3.) (Page 176).
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
Range: Min. = Low Calibration Point
Max. = 61.000 M (200.13 FT)
Default: Value for Low Calibration Pt. + 1 m (3.281 ft.)
Parameter reference (LUI)
Range: 0.000 to 60.000
9.2 Setup (2.)
177