ExOsense Non-Intrusive Liquid Level Sensor0 pages

ExOsense™ Piezo-Resonant Sensors
Non-Intrusive
Repeatable
Easy to Install – Easy to Use

LEVEL SWITCHES – SINGLE POINT

ExOsense™ is the first affordable, non-intrusive liquid level sensor for plastic fluid
containers. ExOsense™ sensors adhere to the outside of tanks, bottles and vessels,
and are unaffected by the color or transparency of the plastic. Liquids inside the
bottle are untouched, so with ExOsense™ there is no issue of material compatibility
or contamination. Best of all, ExOsense™ sensors fit any size and shape vessel, from
small containers to large tanks.

Specifications
Compatible Plastic Bottle Materials
t
Bottle Materials Not Recommended
Min. Bottle Diameter for Round Bottles
Bottle Wall Thickness
Termination of Sensor
Input Power Supply (volts)
t
Power Consumption (current)
Calibration
t
t
t
Output Configuration
Switch Condition
Standard Response Time
Delay Range
t
RFI/EMI Susceptibility
Agency Approvals
t
Operating Temperature
Sensor
Electronics
Repeatability
Accuracy
Sealing Capability

Polyethylene (PE), Polypropylene (PP)
Polycarbonate (PC), ABS, Styrene, PVC, and others
Teflon® family, or Any Foamed Core Plastics
3˝ (76.2 mm)
0.04˝ to 0.15˝ (1.0 mm to 3.8 mm)
Mini USB Style Connector to Electronics
4.75 to 5.25 VDC (Optional Voltage Regulator available
for 6 to 32 VDC.)
<40mA Typ. @ 5 VDC
No User Calibration Required. Pre-configured for
Container Materials, Wall Thickness, & Output Options.
Works on Bottle Materials or Wall Thickness Without
User Input.
Open Collector; 40 mA, Max.
Normally Open/Normally Closed
2 msec.
0 to 60 Seconds, Standard is No Delay,
Optimal is 0 to 60 Seconds.
3v/m
UL 508 Listed (File E 305671),
CE & IEC 61326 (RFI/EMI)

U.S. Patent
7,360,417

Typical Applications
Fluid Monitoring:
•tInk handling systems
•tWater purification systems
•tPesticide management and usage
•tWater treatment systems
•tFluid storage tanks
•tCoolant
•tSaline
•tNuclear liquid wastes
•tContainment systems
•tOil water separation systems
•tSemiconductor fabrication
•tWaste
•tChemicals
•tDetergent/wash

32°F to158°F (0°C to 70°C)
32°F to149°F (0°C to 65°C)
±0.039˝ (±1 mm)
±0.063˝ (±1.6 mm)
IP65
Vessel
Wall

Operating Principle
Our sensor incorporates proprietary transducer technology employing piezoelectric
material. When piezoelectric material is excited, it creates an acoustic signal as a
function of the natural resonance of the material. ExOsense™ sensors generate this
acoustic signal, direct it through the bottle wall and sense the reflected pulse.
The amount of energy that is reflected is determined by the “acoustic impedance*
mismatch” of the materials in use. For example, if sound passes through two
materials with similar acoustic impedances (figure 1), very little energy will be
reflected. If sound passes through two materials with dissimilar impedance values
(figure 2), the majority of the acoustic energy will be reflected. This acoustic
impedance mismatch provides the basis for the detection of liquid level.
*tAcoustic Impedance: a material property defined as the product of sound velocity and material density. The relative transmission and reflection at an interface are governed in part by the acoustic impedances of the materials
on each side of the interface. The letter Z is used for acoustic impedance and is expressed in [kg/s m2] = 1 Rayl:
Water Z = 1.5 MRayls; Air Z = 0 MRayls

Fig. 1

ZPLASTIC = 1.8

ZWATER = 1.5

Fig. 2

ZPLASTIC = 1.8

ZAIR = 0

Z = Acoustic Impedance

A-32

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