Application Example: Stillpipe Or By-Pass Pipe - Siemens SITRANS LR 300 Instruction Manual

Application Example: Stillpipe or By-pass Pipe

This is an alternative to the waveguide antenna option, used for products with an
less than 3, or if extremely turbulent or vortex conditions exist.
Notes:
• For < 3, the lower 40 cm of vessel level may not be measurable.
r
• Only set P837 if the product is at least 2 m (78") away from the flange face. If it is
closer, leave P837 at 1 until the level drops and the distance increases beyond
2m (78").
This application is to obtain a level measurement and
corresponding 4-20 mA output proportional to the oil
level in a fuel storage tank.
The bottom of the SITRANS LR 300 flange is 5 m from
the tank bottom. The empty level is 0m (bottom) and
the full level (span) is 4.5 m from the bottom. The
stillpipe inside diameter is precisely 4.00 inches. The
maximum rate of filling or emptying is about 0.1m/min.
In the event of a loss of echo, the SITRANS LR 300 is
to go into Fail-Safe Hi after 2 minutes.
This mounting arrangement also provides optimum
signal conditions on foaming materials.
Suitable pipe diameters are 50 mm (2") to 250 mm (10"): (see page 54 for typical P655
values).
Set the parameters below in the order shown: (see notes 1 and 2 on next page for more
details).
Parameter
P999
P001
P002
P003
P004
P005
P006
P007
P655 (see page 54)
P800
P820
P837/838
(Note above)
P839
Run: To start normal operation, press the PROGRAM key
7ML19985CL02
Enter
---- master reset
1 mode of measurement
1 material
2 measurement response
240 antenna
1 units
5 empty distance
4.5 span
0.955 propagation factor
0.1 near blanking
12 algorithm
2 & 1 Auto False Echo Suppression
80 Auto TVT Hover Level
SITRANS LR 300 – INSTRUCTION MANUAL
r
Vent hole
100 mm (4.00 ")
diameter
= level
= liquid
= 1m/minute
= factory
= meters
= 5 m
= 4.5 m
= 10 mm (4") pipe
= 0.1 m
= First echo
= 80%
.
Page 53
of