Auto Sensor Offset (2.2.6.) - Siemens SITRANS LUT400 Operating Instructions Manual

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 168) for an illustration. Defined in Units
(2.1.1.) (Page 168).
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 168).
Options
Before using this feature, verify the following parameters are correct:
● Low Calibration Point (2.2.1.) (Page 171) (or Zero Head Offset (2.15.3.5.) (Page 233), if
using OCM)
● Process Temperature (2.12.1.2.) (Page 218)
● Sensor Offset (2.2.3.) (Page 172)
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 168).
The deviation between the calculated and the actual distance value is stored in Sensor
Offset (2.2.3.) (Page 172).
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
Range: Min. = Low Calibration Point
Max. = 61.000 M (200.13 FT)
Default: Value for Low Calibration Pt. + 1 m (3.281 ft.)
Range: 0.000 to 60.000
173