Siemens SITRANS LUT400 Operating Instructions Manual page 150

2.2.6. Auto Sensor Offset
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.).
Values
Before using this feature, verify the following parameters are correct:
2.2.1.Low Calibration Point
•
2. 1 2. 1 .2.Process Temperature
•
• 2.2.3.Sensor Offset
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
The deviation between the calculated and the actual distance value is stored in
2.2.3.Sensor Offset
2.3. Rate
Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.
Notes:
• The following three rate parameters work in conjunction, and are affected by
Response Rate (set in the Quick Start wizard).
• Fill Rate per Minute, Empty Rate per Minute, and Damping Filter automatically
update when Response Rate is altered, but any change to these parameters
will supersede a Response Rate set previously through the wizard.
• For more information,
2.3.1. Fill Rate per Minute
Defines the maximum rate at which the reported level is allowed to increase.
Allows you to adjust the SITRANS LUT400 response to increases in the actual
material level.
Values
Enter a value slightly greater than the vessel's maximum filling rate, in units per
minute.
Page 142 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Range: 0.000 to 60.000
2.15.3.5.Zero Head Offset
(or
Units (2.1.1.)
.
Measurement Response on page 262.
see
Range: 0.000 to 99999.000 m/min
Default: 0.100 m/min
, if using OCM)
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