L ST4 0 0 |
U LT R A S O N I C L E V EL T R A N SM I T T ER
| O I/L S T4 0 0 - EN R E V. E
7
5
When a standpipe is being used it must be as wide as
possible and preferably be made of plastic. The base MUST
have a 45 degree chamfer to reduce the echo size from the
bottom of the standpipe. No welding should be present on
the inside of the pipe as this causes false echoes. Always
increase the blanking 5.91 in / 150 mm past the end of the
standpipe.
Vessel Roof
45° Chamber
Transducer
6
If any large electrical equipment is installed in the vicinity,
then earthed steel conduit must be used.
Key description
LST400 is “user friendly” having only 5 keys and a menu driven
display. The keys are listed below with their appropriate
functions.
SCROLL
This is used to initially access the
programming and then to run through the
various menus.
▼
This key is used to DECREASE the value in the
various commands. This key also starts the
simulation mode increasing in level. See page
27 for details.
▼
This key is used to INCREASE the value in the
various commands. This key also starts the
simulation mode increasing in level. See page
27 for details.
ENTER
When a value has been changed it is only
accepted by pressing the ENTER key. The
ENTER key while in run mode scrolls through
the relay status screen and onscreen KScope
screen and mA output graphc. See page 19 for
details.
RUN
When programming is complete, press RUN to
return to the run mode.
Security code
To advance to the programming mode, the correct security
code must be entered. The factory default code is 5159. This
code can be changed in the programming mode. If you forget
the security code please contact your local ABB agent for the
override code.
