Page 60 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS 7ML1998MV01
mmmmm
Commissioning
Initial device setup
Fail-safe Alarm 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 con-
ditions. 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.
Parameter
Setting/
Value
Description
Enable (2.8.8.1.) Enabled
By selecting Enabled, the fail-safe alarm is now
activated.
Assigned Relay (2.8.8.2.) Relay 1
Select relay to be used for fail-safe alarm.
Relay 1 is the dedicated alarm relay for the
LUT400.
Continue with sampler setup on next page.
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