Siemens SITRANS LUT400 - Page 83

Commissioning
6.8 Application examples
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
81
①
Head 0.6 m
②
High calibration 1.0 m
③
Low Calibration 1.6 m
Initial Device Setup
Quick Start Parameter
Setting/ Value
Description
Transducer XRS-5 For best accuracy, an XRS-5 transducer should be
used in conjunction with the High Accuracy
SITRANS LUT440.
Temperature Source TS-3 For best accuracy, a TS-3 external temperature
sensor is required.
Primary Measuring Device
(PMD)
Exponential Parshall Flumes are a type of exponential device.
Flow Exponent
1.522
Available from the PMD supplier data sheet.
Units
m
Units corresponding to the head measurement.
Low Calibration Point 1.6 The distance to the empty point or bottom of the
flume. This sets the 4 mA setpoint.
High Calibration Point 1.0 The distance to the Max. Head. This sets the 20 mA
setpoint.
Response Rate Medium(1.0
m/min)
Response rate is set to be faster than the fastest
rise in material level under typical operating condi-
tions. In this example, the rate is faster than the
Peak Time rate provided by the end user.
Method of Flow Calculation Ratiometric Used when the Max. Head and Max. Flow values
are provided.
Maximum Head
0.6 m
Available from the PMD supplier data sheet.
Flowrate Units
Cum/hr
Set per end user requirements.
Maximum Flow at 20 mA
1143
Available from the PMD supplier data sheet.
Flowrate Decimal No Digits For the purpose of this example, decimals are not
required.
Low Flow Cutoff 0.00 This parameter stops the LUT440 from totalizing if
the head value corresponding to low flow is
reached. This prevents flow from being totalized
when the head level reaches the ineffective point of
the PMD. Refer to the PMD data sheets for ratings.
Continue with alarm setup below.