SLU – Ultrasonic Level Transmmiter w/ Housing
The SLU Ultrasonic Level Meters are compact measurement devices containing an ultrasonic 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 solutions, waste-water sewage), mash and paste materials (sediments, sticky mediums, resins etc.) in closed or open vessels, sumps, reservoirs and open channels (volume of flow in Parshall flumes). In the case of bulk-solid materials, the measuring range is reduced, but can be amplified or compensated by using the horn accessory.
Measuring Range:
SLU-02: .15 … 2 m
SLU-06: .25 … 6 m
SLU-10: .4 … 10 m
SLU-20: 0.5 … 20 m
Adjustable Measuring Range (SPAN): Min. 200mm
Supply Voltage: 18 … 36 V DC
Output:
SLU-C 4 … 20 mA (Limit values 3.9…20.5mA) HART®
SLU-M RS-485 with protocol Modbus RTU
Output:
SLU-C 4 … 20 mA / Max.20mA
SLU-M Max. 20 mA
Resolution:
SLU02; 10 < 1 mm
SLU06 < 2 mm
SLU20 < 2.5 mm
Accuracy (within the total range): 0.15 %
Temperature Error: Max. 0.04% / K
Operating Frequency:
SLU02: 120kHz
SLU06: 75kHz
SLU10: 50kHz
SLU20: 30kHz
Beamwidth (-3 dB):
SLU02/10: 10°
SLU-06: 14°
SLU-20: 12°
Ambient Temperature Range:
SLU02/06: -30 … +70°C
SLU10/20: -30 … +60°C
Short Time Temperature Stress Resistance: 90°C / 1h.
Max. Operation Overpressure (on transmission surface): 0.1 MPa
Sensitivity: 3 Setting (low – medium – high)
Damping: 0…99 s
Measuring Period: 1…4 s
Failure Indication:
echo failure – basic mode: 3.75 mA (0 V)
echo failure – inverse mode: 22 mA (10.5 V)
level in dead zone – basic mode: 22 mA (10.5 V)
level in dead zone – inverse mode: 3.75 mA (0 V)
Protection Class: IP66
Recommended Cable: PVC 2 x 0.75 mm2 (3 x 0.5 mm 2 )
Maximal Resistance of Current Output Load:
at U = 24 V DC: Rmax = 270 Ω
at U = 22 V DC: Rmax =180 Ω
at U = 20 V DC: Rmax = 90 Ω
Process Connection:
SLU02: Threaded G 1” (optional with Horn adapter)
SLU06: Threaded G 1½” (optional with Horn adapter)
SLU10: Threaded G 2¼‘‘ (optional with Horn adapter)
SLU20: Aluminum alloy flange
Weight:
SLU02: 0.30 kg
SLU06: 0.4 kg
SLU10: 0.7 kg
SLU20: 3.1 kg
– 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
– For continuous level measurement of liquids (even if polluted), mash and paste materials in open or closed vessel, sumps, open channel, drains, etc.
– Quick view measured values on the display
– Easy adjustment without measured material
– Elimination of false echoes
– Zone temperature compensation
– Possibility of using in explosive areas (version X)®
– Current output (4…20mA) with HART protocol or output RS-485 Modbus
– Copying of level meter configuration using display module
– While used with horn adapter can be measured also some difficult media (foamy, levels, bulk solids, etc.
The SLU level meter is equipped with protection against reverse polarity of the supply voltage and against short voltage surges and with protection against current overload at the output.
Protection against dangerous contact is provided by low safe voltage under EN 33 2000-4-41.
Electromagnetic compatibility complies with EN 55011/B, EN 61326-1 and EN 61000-4-2 to 6.
The explosion-proof design of types SLU-X is provided in conformity to the standards: EN 60079-0 : 2007; EN 60079-11 : 2007 and EN 60079-26 : 2007.
A declaration of conformity has been issued for this device in accordance with Act No. 22/1997 Coll., as amended.
The supplied electrical device conforms to the applicable government regulations concerning safety and electromagnetic compatibility.
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