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Minimum distance to medium less than the blind area
If the distance form probe to maximum level of the medium is less than the blind
area of the meter, the measured values are wrong.
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Sensor is too close to the container wall
If the sensor is installed too close to the container wall, strong false echo will be ge-
nerated. The uneven inner surface of the container wall, attached medium, rivet,
screw, reinforcing rib and joint weld on the container inner wall will lead to strong
false echo which will be loaded on the effective echo signals. Therefore, the maxi-
mum distance shall be measured based on the requirements to keep the distance
between the sensor and container wall, which is detailed as follows:
Maximum
Measuring
Range
Distance
to Wall
Maximum
Measuring
Range
Distance
to Wall
Maximum
Measuring
Range
Distance
to Wall
5m
0.5m
10m
1.0m
15m
1.5m
20m
2.5m
30m
4m
40m
5m
50m
6m
60m
7.2m
70m
8.5m
Under worse measuring conditions, the distance between the sensor and the contai-
ner wall shall be enlarged until no false echo occurs.
Prompt: make sure the connecting cable between the probe and meter body of
Remote-type ultrasonic level meter is long enough in advance. Connection with
other cable for extension on site is not allowed as it will affect the signal trans-
mission quality and strength.
During power line connection, AC power line shall not be connected to any ot-
her terminals except AC terminals. Otherwise, the meter circuit or components
and parts will be burnt.
485, 232 and 4-20ma output terminals shall not be short-circuited as short cir-
cuit will lead to burning of internal circuits.
The cables connecting the sensor and main equipment shall not be put in a trunking
with any alternating current. If it can not be prevented, the cables of sensor shall be
protected by a cable conduit to completely shield the electromagnetic interference
caused by alternating current.
4.4 Electric Wiring Diagram