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Side 6
Ultrasonic Level Meter
Operation Manual
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Minimum of measuring range: it is the value of distance between the reference
plane to the position, which is positive when the minimum of measuring range is
above the reference plane and negative when the minimum of measuring range is
below the reference plane. The output current is 4mA when the liquid level is at
such position.
Maximum of measuring range: it is the value of distance between the reference
plane to the position, which is positive when the maximum of measuring range is
above the reference plane and negative when the maximum of measuring range is
below the reference plane. The output current is 20mA when the liquid level is at
such position.
(4)Operating with relay: enter in the alarm settings and set three parameters:
①Alarm mode: select high level alarm, low level alarm or off.
②Alarm value: high level alarm: alarm given when the liquid level is above the alarm
value
Low value alarm: alarm given when the liquid level is below the alarm value
③Return difference value: it is used to prevent the repeated switching of alarm switch
near the alarm point caused by measurement error.
High level alarm state: alarm cancelled when the liquid level is less than (alarm value
- return difference value)
Low level alarm state: alarm cancelled when the liquid level is greater than (alarm
value + return difference value)
(5)Please set the options of probe selection, parameter correction and algorithm selection
under the instruction of professional technicians.
(6)The installed equipment must be grounded truthfully and independently and shall not
share the public grounding with electrical cabinet or meter box.
(7)Suggestions: when the ultrasonic level meter is connected with the frequency
converter, PLC and other equipment with interference, the power supply part
shall be added with isolation transformer, signal part shall be added with signal
isolator and reliable grounding shall be provided.
★The signal line shall not be wired in the same trunking with the power line and it shall
be installed independently through metal tube or far away from the power line. If the
signal line is not installed through tube independently, it shall be kept at least 1m away
from the power line.
Diagram description:
