30
Reference Manual
00809-0100-4530, Rev DD
May 2016
3.2.7
Free space
For easy access to the transmitter, make sure it is mounted with sufficient service space. For
maximum measurement performance, the transmitter should not be mounted close to the
tank wall or near other objects in the tank.
If the probe is mounted close to a wall, nozzle or other tank obstruction, noise may appear
in the level signal. The minimum clearance shown in
is recommended:
Figure 3-13. Free Space Requirement
Table 3-6. Minimum Clearance
Rigid single lead/
segmented rigid
single lead
Flexible single lead
Coaxial
Rigid twin
lead
Flexible twin
lead
Min. clearance
to tank wall (L)
or
obstruction
(1)
1.
Minimum clearance from tank bottom for the coaxial and rigid single probes is 0.2 in. (5 mm).
4 in. (10 cm) if smooth
metallic wall.
20 in. (50 cm)
(2)
if
disturbing objects such
as pipes and beams,
rugged metallic or
concrete/plastic wall.
2.
When measuring in low DC (around 1.4). For higher DC, the recommended free space is lower.
4 in. (10 cm) if smooth
metallic wall.
20 in. (50 cm) if
disturbing objects such
as pipes and beams,
rugged metallic or
concrete/plastic wall.
0 in. (0 cm)
4 in. (10 cm)
4 in. (10 cm)
Min. chamber/
still pipe
diameter
2 in. (5 cm)
(3)
3.
The probe must be centered in the pipe/bypass. A centering disc (see
) can be used to prevent the probe from contacting the chamber wall.
Consult the factory
1.5 in.
(3.8 cm)
2 in. (5 cm)
(4)
4.
The centermost lead must be at least 0.6 in. (15 mm) away from the pipe/bypass wall.
Consult the
factory
