6
3
Function
An ultrasonic emitter (sensor) mounted above the product is electrically excited and directs an
ultrasonic pulse through the air towards the product. This pulse is reflected back from the surface of
the product. The echoes partially reflected are detected by the same sensor, now acting as a receiver,
and converted back into an electrical signal. The time taken between transmission and reception of
the pulse – the time-of-flight – is directly proportional to the distance between the sensor and the
product surface.
4
Application and measuring
ranges
The LUC-T is a compact ultrasonic transmitter for continuous non-contact level measurement in
liquids and in coarse-grained or pelleted solids (grain size from 4 mm/0.16 in). It has an integrated
temperature sensor for time-of-flight compensation. The LUC-T series consists of three transmitters,
which can be equipped with one of several electronic modules, with graduated measuring ranges from
0.25 m (0.82 ft) upwards
2-Wire, 4 mA … 20 mA "Loop-Powered"
LUC-T
!!
-
!!!
-
!!!
-
!!
.
4-Wire, including mains power supply
LUC-T
!!
-
!!!
-
!!!
-
!!
Sensor
Process connection
Measuring ranges
liquid:
solid:
LUC-T10-G5
1½"
m/ft
0.25-4/0.8-13
0.25-2/0.8-6.6
LUC-T10-G6
2"
m/ft
0.4-7/1.3-23
0.4-3.5/1.3-11.5
LUC-T20-G5
1½"
m/ft
0.25-4/0.8-13.1
0.25-2/0.8-6.6
LUC-T20-G6
2"
m/ft
0.4-7/1.3-23
0.4-3.5/1.3-11.5
LUC-T30-FA
4"
m/ft
0.6-15/2-49
0.6-7/2-23
without
communication
I2
I2
I2
I2
–
HART
IH
IH
IH
IH
–
PROFIBUS-PA
PA
PA
PA
PA
PA
El
ec
tr
o
nic
v
er
si
ons
Sensor
Process connection
Measuring ranges
liquid:
solid:
LUC-T20-G5
1½"
m/ft
0.25-5/0.8-16.4
0.25-2/0.8-6.6
LUC-T20-G6
2"
m/ft
0.4-8/1.3-26
0.4-3.5/1.3-11.5
LUC-T30-FA
4"
m/ft
0.6-15/2-49
0.6-7/2-23
power supply
180 V ...
250 V AC
90 V ...
127 V AC
18 V ...
36 V DC
180 V ...
250 V AC
90 V ...
127 V AC
18 V ...
36 V DC
180 V...
250 V AC
90 V ...
127 V AC
18 V ...
36 V DC
without
communication
AC
UC
DC
AC
UC
DC
AC
UC
DC
HART
AH
UH
DH
AH
UH
DH
AH
UH
DH
PROFIBUS-PA
(2-wire)
PA
PA
PA
PA
PA
PA
PA
PA
PA
Ele
ctr
on
ic
ve
rs
io
ns
