MSLU – Compact Ultrasonic Level Transmmiter
The MSLU 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, voltage 0…10 V or output RS-485 Modbus.
The MSLU ultrasonic level meters are suitable for continuous non-contact level measurement of liquids (water solutions, waste water, etc.), mash and paste materials (sediments, sticks, 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. Set-up and calibration is done via two buttons positioned in the upper part of the sensor or via a magnetic touch pen. The level meter is equipped with optical state indication (STATE) and with a set-up process (MENU). They are manufactured for either explosive (X) areas or non-explosive areas (N).
Measuring Range:
MSLU-010 .1 … 1 m
MSLU-020 .2 … 2 m
MSLU-060 .2 … 6 m
MSLU-100 .4 … 10 m
MSLU-20: 0.5 … 20 m
Supply Voltage: 18 … 36 V DC
Current Supply:
MSLU-(01/02/06/10/20)-X-(N)-C 4 … 20 mA / max. 22 mA
MSLU-(01/02/06/10/20)-X-C Max. 12 mA
MSLU-(01/02/06/10/20)-X-M Max. 20 mA
Current Output MSLU-(01/02/06/10/20)-C: 4 … 20 mA (limit values 3.9 … 20.5 mA)
Voltage Output MSLU-(01/02/06/10/20)-V: 0 … 10 V (limit values 0 … 10.2 V)
Modbus Output MSLU-(01/02/06/10/20)-M: Modbus RTU protocol
Resolution: < 1 mm
Accuracy (within the total range):
MSLU-01 in area 0.1–0.2 m / 0.2–1.0 m 0.3 % / 0.2 %
MSLU-02; 06 0.15 %
MSLU-10; 20 0.2 %
Temperature Error: Max. 0.04% / K
Beamwidth (-3 dB):
MSLU-01; 02; 10: 10°
MSLU-06: 14°
MSLU-20: 12°
Ambient temperature Range:
MSLU-01; 02; 06: -30 … +70°C
MSLU-10; 20: -30 … +60°C
Measuring Period:
MSLU-01; 02: 0.5 s
MSLU-06; 10: 1.2 s
MSLU-20: 5.0 s
MSLU-M (Modbus): Adjustable via Modbus RTU
Averaging (can be modified according to agreement)
MSLU-_ _: 4 measurement
MSLU-M (Modbus): Adjustable via Modbus RTU
Short Time Temperature Stress Resistance: +90°C / 1 h.
Max. Operation Overpressure (on transmission surface): 0.1 MPa
Max. internal values 2) (for the X version only): Ui=30 V DC; Ii=132 mA; Pi=0.99 W; Ci=370 nF; Li=0.9 mH
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: IP67
Recommended Cable: PVC 2 x 0.75 mm2 (3 x 0.5 mm 2 )
Maximal Current Output Load Resistance:
at U = 24 V DC: Rmax = 270 Ω
at U = 22 V DC: Rmax =180 Ω
at U = 20 V DC: Rmax = 90 Ω
Minimal Voltage Output Load Resistance: Rmin > 1 kΩ
Delay Between Supply Power Rise Time and First Measurement:
MSLU-01; 02; 06: 5 s
MSLU-10; 20: 9 s
Process Connection:
MSLU-01: Threaded G ¾”
MSLU-02: Threaded G 1” (optional with Horn adapter)
MSLU-06: Threaded G 1½” (optional with Horn adapter)
MSLU-10: Threaded G 2¼‘‘ (optional with Horn adapter)
MSLU-20: Aluminum alloy flange
Weight:
MSLU-01: 0.20 kg
MSLU-02: 0.20 kg
MSLU-06: 0.25 kg
MSLU-10: 0.65 kg
MSLU-20: 2.80 k
Features and Versions:
• MSLU-01 Measuring range from 0.1 m to 1 m , plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G ¾”.
• MSLU-02 Measuring range from 0.2 m to 2 m , plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1″.
• MSLU-06 Measuring range from 0.2 m to 6 m , plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1 ½”.
• MSLU-10 Measuring range from 0.4 m to 10 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 2 ¼”.
• MSLU-20 Measuring range from 0.5 m to 20 m, with plastic PVDF transmitter and plastic body (PP+HDPE), aluminum alloy flange.
- Sumps
- Resevoirs
- Large Tanks
- Open Canals
The MSLU 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 MSLU-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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