Auto Zero Head (2.15.2.); Basic Setup (2.15.3.) - Siemens SITRANS L 7ML5400 Operating Instructions Manual

The LUT400 is pre-programmed for common PMD flow calculations. If your PMD is not listed,
use a Universal Flow calculation. See Universal calculation support (Page 149).
9.2.15.2

Auto Zero Head (2.15.2.)

Calibrates Zero Head Offset (2.15.3.5.) (Page 237) (defined in Units (2.1.1.) (Page 172))
based on actual head measurements.
Values
Use this parameter when the reported head is consistently high or low by a fixed amount.
Before using this feature, verify the following parameters are correct:
• Low Calibration Point (2.2.1.) (Page 176)
• Process Temperature (2.12.1.2.) (Page 222)
With HEAD steady...
1. Measure the actual head (e.g. with a tape measure or solid rule)
2. Enter the actual head value
The deviation between the entered head value and the calibrated value, is stored in Zero
Head Offset (2.15.3.5.) (Page 237).
9.2.15.3

Basic Setup (2.15.3.)

Method of Flow Calculation (2.15.3.1.)
Sets the method of flow calculation.
Options
Set this parameter to Ratiometric only if the primary measuring device (PMD) supports
ratiometric calculations. (Note that Palmer Bowlus Flume and H-Flume support ratiometric
calculations only.) For more details on Absolute and Ratiometric calculations, see Method of
Flow Calculation (Page 306).
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
TRAPEZOIDAL FLUME BS-3680
U-FLUME BS-3680
FINITE CREST WEIR BS-3680
THIN PLATE RECT. WEIR BS-3680
THIN PLATE V-NOTCH WEIR BS-3680
RECT. WEIR CONTRACTED
ROUND PIPE
PALMER BOWLUS FLUME
H-FLUME
UNIVERSAL HEAD FLOW
Range: -60.000 to 60.000
Default: 0.000
*
Parameter reference (LUI)
9.2 Setup (2.)
ABSOLUTE
RATIOMETRIC
235