Siemens SITRANS LR 300, Инструкция по эксплуатации, Страница: 51 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 49
mm
mmm
Applications
Application Examples
These SITRANS LR 300 application examples can be used as set-up references. The
parameter value tables relate the values to the functions.
Application Example: Asphalt in Storage Tank
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 = 5m
P007 4.5 span = 4.5m
P070 2 Fail-Safe timer = 2 minutes
P071 1 Fail-Safe = Hi
P820 8 algorithm = Blf (best of Largest or First)
P830 7 TVT type = factory
P837/838
(Note above) 2 & 1 Auto False Echo Suppression
Notes:
• The minimum distance from the flange face to the target is limited by near-blanking
P800.
• Only set P837 if the product is at least 2m (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”).
The application is to obtain a level
measurement and corresponding 4-20 mA
output proportional to asphalt levels in a
storage tank.
The bottom of the antenna flange is 5m
from the tank bottom. The empty level is 0m
(bottom) and the full level (span) is 4.5m
from the bottom. 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-Save Hi after 2 minutes.
Asphalt build-up on the rod antenna does
not affect performance.
Empty
(P006)
Span
P007)
SITRANS LR 300.book Page 49 Monday, June 10, 2002 7:18 PM