14
Programmed
measurement
range of the
application
Min
.
me
as
di
st
an
ce
(de
ad
ba
nd
)
DE
FA
U
LT
va
lu
e
of
P0
5
Ma
x
me
as
ur
in
g
di
st
of
th
e
ap
pli
c
ati
o
n
pr
o
gra
m
m
ed
va
lu
e
of
P0
4
Ma
x.
me
as
ur
e
m
e
nt
ra
n g
e
of
th
e
de
vi
ce
Ma
x.
me
as
ur
in
g
di
st
anc
e
of
th
e
de
vi
ce
DE
FA
U
LT
va
lu
e
of
P0
4
P06
Far end blocking
DIST=distance (measured)
Close end blocking (programmed value
of P05 DEFAULT value of P05))
LEV=level (calculed; P04-DIST)
VOL=volume (calculated from DIST LEV)
Basic conception and elements of the ultrasonic measurement
P04:
Maximum measuring distance
The maximum measuring distance is the only one parameter that has to be programmed for each application other than
distance measurement mode. The DEFAULT value of P04 (see table below) can also be displayed by double key pressing
NEXT
+ DOWN
.
Echotel
Maximum measuring
distance
Level transmitters
for liquids
PP or PVDF
(m/ft)
Echotel 338
6 / 20
Echoptel 335
8 / 26
Keep in mind that
LEVEL
(as
the result of the measurement)
= P04
(programmed)
– DISTANCE
(measured by the device)
Since the accuracy of level
(and all further calculated)
value depends on the accuracy of the max measuring distance of the
application which is the distance between the sensor face and the tank / silo bottom.
To obtain the best accuracy for a liquid level measurement, measure this distance in the empty tank with the Echotel by
using
the “GET LEVEL” function (press UP
and DOWN
keys simultaneously) provided the bottom is flat. Enter the actual
measured value displayed as P04.
Values of the maximum measuring distance will be in accordance with the table below.
Engineering unit
Display format
m
x.xxx or xx.xx
cm
xxx.x
ft
xx.xx or xxx.x
inch
xxx.x