Installation; Blocking Distance; Housing - Pepperl+Fuchs LUC-T Series Manual

6 Installation

6.1

Blocking distance

Due to the ringing time of the sensor,
there is a zone immediately below it in
which returning echoes cannot be
detected. This so-called blocking
distance is very important to the correct
function of the LUC-T. It determines
the minimum distance between the
sensor and the maximum level.
• Mount the sensor such that the
distance between it and the
maximum product level exceeds the
blocking distance. Please note that if
product enters the b
• Never mount two LUC-T in a vessel
because the instruments may not
function correctly.
• Do not mount the sensor in the
centre of the vessel roof.
• Install the transmitter at right angles
to the surface of the material.
• Do not measure through the filling
curtain.
6.2

Housing

• Cable entry PG16
Break the cable entry in the
housingbefore mounting.
• Cable diameter 5 mm ... 9 mm
(0.2 in ... 0.35 in)
• Sleeves for connection thread G½;
½ NPT or M20 x 1.5 supplied.
8
105 (4.1)
LUC-T!!-!5
112 (4.3)
91 (3.5)
LUC-T!!-!6
ø50
(1.95)
Protective hood LUC-Z11
max.
BD
Housing
Rotatable housing.
Can be repositioned after mounting.
max. torque
15 Nm ... 20 Nm
(11.1 ft ... 14.8 ft lbs)
Blocking distance
BD
Sensor BD
LUC-T m (ft)
-G5, -N5 0.25
(0.82)
-G6, -N6 0.4
(1.3)
-FA 0.6
(2)
60 AF
(2.34 in)