Operation and Signal
Processing
Principle of Operation
An ultrasonic pulse emitted from the
sensor is reflected back by the surface
of the material or liquid and is received
by the same sensor as an echo signal.
The product height or water level is then
calculated from the run time of the
ultrasonic signal (echo level
determination).
Simple Operation
The keypad on the front panel is used to
configure the transmitter and call up
parameters, which are shown on a 4 1/2
character display.
Input dialogue is based on the standard
Hauser operating matrix in
which every input field is quickly and
easily selected using the »V« (vertical)
and »H« (horizontal) keys. Parameters
are simply entered using the three keys
»–«, »+«, »
➞
« and are registered and
stored once the »E« key has been
pressed.
Intelligent Software with Fuzzy
Logic Elements
The Prosonic transmitter is based on
state-of-the-art evaluation methods
including fuzzy logic elements for
intelligent echo analysis. No other
special procedures are required as this
method enables the true level echo to
be clearly distinguished from:
•
sporadic reflections (e.g. from agitator
blades),
•
interference echoes and noise (e.g.
from filling) or
•
multiple reflections (e.g. with closed
tanks).
Even with almost unfavorable mounting
points, the advantages of continuous,
non-contact ultrasonic measurement
can be used by activating a special
fixed target suppression mode or
filtering factor.
Simple Start-Up
The time required for start-up is
minimised by using preset operating
parameter values. Selecting just one
parameter automatically sets the
measuring line to one of five typical
applications.
•
liquid
•
vessels with rapid changes of liquid
•
fine-grained bulk solids
•
coarse-grained bulk solids
•
conveyor belts
Complete Functionality
•
For level measurement
The characteristic curve is already
programmed for volumetric
measurement in a horizontal cylinder.
The linearisation curve of any vessel can
be easily entered (maximum 32 points).
The Prosonic FMU 862 also has a
differential measurement mode
(Value 1 – Value 2)
or average value mode
(
Value 1
+
Value 2
)
2
•
For flow rate measurement
All common Q/h characteristic curves
for measuring flow rates with flumes and
weirs are stored in the Prosonic. Other
Q/h curves can be entered (up to a
maximum of 32 points).
Three different programmable counting
pulses for totalising can be sent to the
relay outputs for controlling external
counters. The transmitter itself has a
resettable software counter: a
non-resettable totaliser is available as
an option.
H
V
+
-
E
Only a few input steps are
required for calibrating all
standard applications.
Measured
value
Empty
calibration
Full
calibration
Application Sensor
type
Relay
selection
Relay
function
Switch-on
point
Switch-off
point
Pump
control
Lineari-
sation
Preset
height
Q/h char.
curve
Level
Volume
Fixed
target
suppress.
Echo
attenuation
S/N
factor
Warning/
Fault
Output
with
fault
4
