LeviFlow LFS-03SU, LFS-06SU, LFS-10SU, LFS-20SU Data Sheet
LEVIFLOW® Ultrasonic Technology
Single-Use High Precision Flowmeters
LFS-SU Single-Use Flowmeters
LFS-03SU: 0 – 0.8 l/min LFS-06SU: 0 – 8 l/min
LFS-10SU: 0 – 20 l/min LFS-20SU: 0 – 80 l/min
Ultraclean Non-Invasive Flow Measurement
ULTRASONIC FLOW MEASUREMENT
Figure 1: Operating principle of ultrasonic single-use sensor
Measurement Path
INTRODUCTION
The LEVIFLOW® single-use flowmeters are designed for non-
invasive flow measurements of high purity fluids with flexible
tubing. Figure 1 illustrates the operating principle. Two piezo-
electric transducers, mounted in the sensor housing, generate
and receive an ultrasonic wave. The wave going in direction of
the flow (with-stream wave) is accelerated and the wave going
against the flow direction (against-stream wave) is slowed
down. The two waves are processed by a signal converter. The
difference of the transit time of both waves is proportional to the
velocity of the fluid. The wet materials of the single-use sensors
fabricated from biocompatible (FDA, USP-VI, BSE/TSE and
Animal free) gamma sterilizable polypropylene (PP).
The standard configuration of the LEVIFLOW® single-use
flowmeters (Figure 3) consists of a flow sensor and a converter
with a digital signal processor (DSP) for processing the sensor
signals. Various signals (analog output, digital input/output) are
provided and can be configured with a PC software. A two wire
RS485 bus allows arrays of multiple flowmeters. In addition, the
sensor value is shown on a 4-digit display. For debugging, data
collection and configuration with a PC the LEVIFLOW®
Configuration Software is available at Levitronix® together with a
USB to RS485 adaptor (see Figure 3).
Figure 2: Single-use flowsensor
1
Flow Out
Flow In
Interconnect Cable
Various lengths.
Direct connection possible.
Adaptor/Extension Cable
Wallmountable connector
for cabinet mounting
Figure 3: System configuration for usage with LEVIFLOW®
configuration software
3a
2b
EMI Ferrite
Single-Channel Converter LFC-1C-PC
Digital
Signal Processor
DSP
Piezo Transducers
In-/Output
Other RS485
Devices
Electrical Interface
3b
RS485
(MODBUS)
BUS
Converter
4
RS232/RS485
or
USB/RS485
Analog and
Digital Outputs
- 1x Analog Output
- 2x Digital Outputs
- 1x Digital Input
RS232 or USB
Power Supply: 24 VDC
Configuration Software
Watertight
Connector
Box
2a
®
LEVIFLOW
SYSTEM BENEFITS
High precision (1%) flow measurement
No contamination due to non-invasive flow measurement
No moving parts -> no particle generation
Improved bubble robustness due to DSP technology
Flow control together with Levitronix
MagLev Pumps
Easy integration into OEM equipment
Easy configurable flow sensor parameters (PC software)
Integrated and configurable totalizer function
APPLICATIONS
High purity and high precision liquid processes
Sterile non-invasive flow measurement in Pharmaceutical
manufacturing
Biotech processes
Flow control in combination with Levitronix
MagLev pump
systems
Single-use disposable applications
SENSOR SPECIFICATIONS
Sensor Type
Characteristics
LFS-03SU
Flow Range [lpm] 0 – 0.8 0 – 8 0 – 20 0 – 80
Triclamp Fitting Size 3/8” (ID = 6.4 mm) 3/8” (ID = 6.4 mm) 1/2” (ID = 9.4 mm) 1” (ID = 22.2 mm)
Measurement Path ID in [mm] 2.5 6 10 20
Accuracy of Reading
Note: Repeatability < Accuracy/2
see Figure 4
Wetted Surface Area [cm2] 29.5 32.2 53.2 173.5
Wetted Surface Area [ml] 4 4.8 12.3 95.8
Weight [g] 42 43 61 125
Pressure Drop Coefficient C at 20°C
P = C x Q2 ,
16.8 0.88 0.075 0.0035
Q = Flow [lpm], P = Press. Drop [kPa]
Fluid Temperature Normal range: 10 – 60 °C ( 50 – 140 °F )
Ambient Temperature 0 – 40 °C (32 – 104 °F)
Maximum Fluid Pressure 0 – 0.5 MPa ( 0 – 5 bar, 0 – 72.5 psi)
Kinematic Viscosity 0.8 – 40 mm2/s (0.8 – 40 cSt)
Sound Speed 1000 – 2200 m/s
Wet Materials Polypropylene (FDA, USP VI, ADI free), Gamma robust for up to 40 kGy
Sensor Enclosure Classification IP-65 (for connected sensor)
Cable Jacket Material PVC
Cable Length Various extension cables available.
Electrical Connectors Circular type (IP-67), lock-release mounting
LFS-06SU
LFS-06SU-SC1
LFS-06SU:
> 1.7 l/min: ±1%
< 1.7 l/min: ±17 ml/min
LFS-06SU-SC1:
> 0.08 l/min: ±1%
< 0.08 l/min: 0.8 ml/min
LFS-10SU LFS-20SU
> 4.7 l/min: ±1%
< 4.7 l/min: ±47 ml/min
>18.8 l/min: ±1 %
<18.8 l/min: ±188 ml/min
10%
9%
8%
7%
6%
5%
4%
3%
2%
Table 1: Specifications of flow sensors (all data based on calibration with water at 20°C)
Full Scale = 35 mlpm
Full Scale = 800 mlpm
Accuracy of Reading
Repeatability of Reading
Full Scale Change Line
1%
0%
1101001000
[mlpm]
Figure 4: Accuracy and repeatability for single-use sensor LFS-03SU
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