Sitron SLU, Руководство по установке, Страница: 2 / 24

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Safety
All operations described in this instruction manual should be carried out only by trained personnel or an
accredited person. Warranty and post warranty service must be exclusively carried out by the manufacturer.
Improper use, installation or set-up of the level meter can result in undesirable results (overfilling of the tank
or damage of system components).
The manufacturer is not responsible for improper use, losses of work caused by either direct or indirect
damage, and for expenses incurred during installation or use of the level meter.
Measuring Principle
The SLU Ultrasonic level meters are compact measurement devices containing an ultasonic transmitter and an
electronic module. The transducer generates ultrasonic pulses that travel at the speed of sound toward the target
medium. These sound waves are reflected off the surface of the medium and are received by the transducer system.
The “time of flight” between the transducer and the surface and then back to the transducer is measured. Based on the
time period during which the individual pulses spread towards the level and back, this period is averaged by the
electronics (that also performs temperature compensation) and subsequently are converted to an output current
4...20mA with HART protocol or output RS-485 Modbus and the measured value is displayed on the display.
The central processor evaluates and blocks out interfering signals, performs temperature compensation, compares the
cleaned received signal with the false reflection map (e.g. from mixers, ladders, reinforcement etc.) and selects a
suitable reflection (echo).
The SLU ultrasonic level meters are suitable for continuous non-contact level measurement of liquids (water, waste
water sewage, etc.), mash and paste materials (sediments, resins etc.) in closed or open vessels, sumps, reservoirs
and open channels. In the case of bulk-solid materials, the measuring range is reduced, but can be amplified or
compensated by using the horn accessory.
Variant of Sensor
- SLU-02 - Measuring range from 0.15m - 2m plastic PVDF transmitter and plastic body (PP+HDPE),
process connection with thread G 1"
- SLU-06 - Measuring range from 0.25m - 6m plastic PVDF transmitter and plastic body (PP+HDPE),
process connection with thread G 1.1/2"
- SLU-10 - Measuring range from 0.4m - 10m plastic PVDF transmitter and plastic body (PP+HDPE),
process connection with thread G 2.1/4"
- SLU-20 - Measuring range from 0.5m - 20m plastic PVDF transmitter and plastic body (PP+HDPE),
aluminum alloy flange
Installation Manual