2.1
Mounting considerations
The probes should be installed so that they are not directly impacted by liquids flowing out
of the filling inlet. The probe have to be installed as far as possible from the exit tank
drains because the suction effect could damage the probe.
The single rod and rope probes should neither touch nor sway towards other objects
inside the tank or the tank/nozzle walls; e.g. by agitator swirls. In applications with very
strong fluid movements, which can also cause excessive lateral force on the probe, it is
recommended to fix the probe. The anchoring fixtures are customer supplied.
The coaxial probe can be fixed to the tank wall by lateral brackets attached to the tank
wall. Alternatively, a piece of tube attached to the tank bottom can serve as a socket for
holding the end of the coaxial probe in place. In this case proper drainage of the socket
has to be ensured. Any probe fixtures should only guide the probe and not tightly fixed it
to enable movement due to thermal expansion
.
4
The single rod and the rope probe are suitable for a very wide range of applications and
liquids, but the signal has a wider detection radius around the rod or cable. Thus, they are
more responsive for measurement signal disturbances which can be easily overcome by
observing a few mounting considerations (see figure 1) and making simple configuration
adjustments to the sensor; in most cases it is enough to activate and utilize the powerful
disturbance signal suppression features of LTDR. However, those work most efficiently on
stationary interference targets like tall and narrow nozzles or close-by objects. In case that
non-stationary interference targets close to the single rod probe, like slowly rotating
agitator blades, cause problems with the measurement, it is recommended to use the
coaxial probe.
In any case, the single rod probe and the rope probe should never get in direct contact
with the tank/nozzle wall or other objects in the tank.
The coaxial probe does not have restrictions regarding mounting position, tank
connection, and proximity to the tank wall or other objects inside the tank.
Figure 2: mounting considerations
- = no restrictions
1
enough diameter to fit in the coaxial tube (Ø17,2mm)
2
enough diameter to fit in the coaxial tube (Ø17,2mm) and enough room around the
probe for the liquid to flow in and out of the bypass chamber / stilling well
SINGLE ROD AND ROPE PROBE
COAXIAL PROBE
nozzle diameter
-
1
>50mm
nozzle height
-
<300mm
clearance to tank wall or other internal objects
-
>100mm
clearance between probe end and tank bottom
-
>2mm
diameter of bypass chamber / stilling well
-
2
>25mm
