Sitron SLU, Руководство по установке, Страница: 4 / 24

Fig. 2: Level meter dead zone
m – Dead zone
(blind zone, blocking distance)
-
Fig. 3: Installation distance from the tank wall
SLU–02 ; 10
d > 1/12 c
(min. 200 mm)
SLU–06
d > 1/8 c
(min. 200 mm)
SLU–20
d > 1/10 c
(min. 200 mm)
Fig. 4: Possible installation of the installation neck
a – Neck height
b – Neck width
m – Dead zone (blind zone, blocking dist.)
SLU–02 ; 06
a < 3 b
b > 100 mm
SLU–10
a < 1.5 b
b > 100 mm
SLU–20
a < 1.5 b
b > 150 mm
d – Distance from
the tank wall
c – Maximum reach
of the level meter
4
Installation Instructions
Install the level meter in the vertical position into the upper lid of the tank or vessel or
reservoir using a the threaded connection, a fastening nut or a flange so that the level
meter axis is perpendicular to the surface level of the measured liquid( Fig.1)
The min. dimensional parameters to install the level meter in to a lid or a celling of tank are
givening (Fig.3)
When installing in an open channel (reservoir, drain etc.) install the level meter on to a
bracket as close as possible to the expected max. level.
Each measuring range of SLU models has a specified ‘‘dead zone’. This means that
within the first 10 to 50 centimers (depending on the model) below the transmitter, no
signal reflected in this area can be evaluated. The dead zone (Fig.2) determines the min.
distance possible between the level meter and the highest surface level. The min.
distances to the medium are given in the chapter ‘Specifications’.
It is necessary to install the level meter so that the target level will not interfere with the
dead zone when filled up to the maximum level. If the measured level interferes with the
dead zone, the level meter will not work supply the correct output signal.
Fig.1 Recomended installation
in the tank
d – Distance from
the tank wall
c – Maximum reach
of the level meter
If the maximum surface level in the tank interferes with the dead zone, the level mater has to be mounted higher within a
neck extention to the tank. In this way, the tank can be filled to the maximum volume. The inner neck surface has to be
even and smooth (without edges and welded points) the inner edge should be rounded where the ultrasonic wave
eminates from the pipe. The neck diameter should be as large as possible but the neck height should be as low as
possible, minimizing the extra distance between the medium and the sensor. Recommended dimensions of the
extended neck are given in (Fig.4).
Installation Manual