Siemens SITRANS LUT400 - Primary Measuring Device (PMD) (2.15.1.); Auto Zero Head (2.15.2.)

SITRANS LUT400
230 Operating Instructions, 07/2019, A5E33329501-AC
9.2.15.1 Primary Measuring Device (PMD) (2.15.1.)
The type of primary measuring device (PMD) used.
Values
*
OFF (no calculation)
EXPONENTIAL DEVICES
RECTANGULAR FLUME BS-3680
ROUND NOSE HORIZONTAL CR. BS-3680
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
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 147).
9.2.15.2 Auto Zero Head (2.15.2.)
Calibrates Zero Head Offset (2.15.3.5.) (Page 233) (defined in Units (2.1.1.) (Page 168))
based on actual head measurements.
Values
Range: -60.000 to 60.000
Default: 0.000
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 171)
● Process Temperature (2.12.1.2.) (Page 218)
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 233).