Instruction manual

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 53
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Applications
Application Example: Stillpipe or By-pass Pipe
This is an alternative to the waveguide antenna option, used for products with an ε
r
of
less than 3, or if extremely turbulent or vortex conditions exist.
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).
Run: To start normal operation, press the PROGRAM key .
Parameter Enter
P999 ---- master reset
P001 1 mode of measurement = level
P002 1 material = liquid
P003 2 measurement response = 1m/minute
P004 240 antenna = factory
P005 1 units = meters
P006 5 empty distance = 5 m
P007 4.5 span = 4.5 m
P655 (see page 54) 0.955 propagation factor = 10 mm (4”) pipe
P800 0.1 near blanking = 0.1 m
P820 12 algorithm = First echo
P837/838
(Note above) 2 & 1 Auto False Echo Suppression
P839 80 Auto TVT Hover Level = 80%
Notes:
•For ε
r
< 3, the lower 40 cm of vessel level may not be measurable.
• 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.
100 mm (4.00 ”)
diameter
Vent hole
SITRANS LR 300.book Page 53 Monday, June 10, 2002 7:18 PM