Application Examples; Example 1: Liquid Resin In Storage Vessel, Level Measurement - Siemens SITRANS LR250 Instruction Manual

Application Examples

You can use these examples as setup references. Enter the values in the parameter
tables to select the corresponding functions.
Example 1: Liquid resin in storage vessel, level
measurement
Notes:
• The minimum distance from the flange face to the target is limited by near range
2.2.1.11.
• Only set 2.2.5.6 (Auto False Echo Suppression) if the product is at least 2 m (78")
away from the flange face. If it is closer, leave 2.2.5.6 at 1 until the level drops
and the distance increases beyond 2 m (78").
Sensor
reference
point
High
G R A P H I C T O B
Cal
Point
5 m
4.5 m
Low Cal
Point
Parameter
2.2.1.5
2.2.7.1
2.2.1.4
2.2. 1 .6
2.2.1.7
2.4. 1
2.4.2
2.2.5.7
2.2.5.6
1.
Distance to product from reference point.
2.
For more details see
False Echo Suppression
Return to Measurement: press Mode
Page 58 SITRANS LR250 (HART) – INSTRUCTION MANUAL
E U P D A T E D
100% Level
0% Level
Description
operation
measurement response
units
low calibration point
high calibration point
Failsafe timer
Failsafe Material Level
Auto False-Echo
Suppression Distance
Auto False-Echo
Suppression
Range (Auto Suppression Range)
on page 74.
The application is to obtain a level
measurement and corresponding 4 to 20 mA
output proportional to resin levels in a
storage vessel.
Low Calibration Point is the bottom of the
tank, which is 5 m from the antenna flange
face. High Calibration Point is 4.5 m from the
vessel bottom. The maximum rate of filling or
emptying is about 0.2 m/min.
In the event of a loss of echo, SITRANS LR250
is to go into Failsafe Hi after 2 minutes.
Value
Level
Med
M
5
4.5
2
HI
1
[Distance
minus 0.42 m]
2 then
1
on page 75 and
to start normal operation.
Function
Level
1 m/minute
meters
5 m
4.5 m
2 minutes
Hi
Sets length of learned
2
TVT curve to use
Enables the use of
2
learned TVT curve .
Auto
7ML19985JE01