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Sensing Solutions
Sensing Solutions
Surface Acoustic Wave Technology for Temperature Sensing
SenGenuity’s TempTrackr™ temperature sensor modules are using a crystal sensing element which
is based on Surface Acoustic Wave (SAW) technology and makes use of the piezoelectricity.
Piezoelectricity
World-Wide Locations
Reverse Piezoelectricity Effect (RPE)
We Can Sense It
United States
It uses a piezoelectric sensing element (crystal) which is excited by a high-frequency oscillator and
operates in the thickness shear mode (TSM) of vibration. In this mode, shear displacement occurs
on the crystal faces in the plane of the crystal plate. Figure 1 illustrates that the displacement profile
occurs throughout the thickness of the sensing element and is at its maximum at the surfaces.
VI Mount Holly Springs
100 Watts Street
Mount Holly Springs, PA 17065
Tel: 1.717.486.3411
Fax: 1.717.486.5920
Generation of an electrical field through an applied
mechanical pressure.
Generation of a mechanical motion by applying an electrical
field.
Top
Electrode
VI Cincinnati
4914 Gray Road
Cincinnati, OH 45232
Tel: 1.513.542.5555
Fax: 1.513.542.5146
Both piezoelectric effects occur in the TempTrackr™ temperature sensor modules. An oscillating
electric field is applied to the sensor modules to create a mechanical wave (RPE), which propagates
on the substrate and is then converted back to an electric field for measurement (DPE).
Sensing Solutions
SENSORS
Europe
VI Neckarbischofsheim
Landstrasse, D-74924
Neckarbischofsheim, Germany
Tel: +49 (0) 7268.8010
Fax: +49 (0) 7268.801281
Viscosity Sensor Systems
3. Micro-acoustic energy stored in SAW Sensor is transmitted back to Interrogator at temperaturedependent characteristic frequency
Bottom
Electrode
Thus, the acoustic wave resonator supports a standing wave through its thickness. The wave
pattern interacts with electrodes on the lower surface (hermetically sealed from the liquid) and
with the fluid on the upper surface (top electrode). When placing a TSM BAW device into a liquid, a
layer of fluid couples to the cyclical shear displacement of the vibrating surface. This displacement
is atomic scale and at a frequency of 5.25 million cycles per second. Increases in viscosity and
loading increase the damping of the TSM BAW and therefore, reduces the BAW sensor’s frequency.
• Printing Inks
• Lubricant Monitoring
• Marine
• On & Off Road Vehicles
Asia
2. Signal is received by Sensor Module Antenna and converted into surface acoustic wave (SAW)
inside piezoelectric sensing element
ux(y)
Applying Acoustic Wave Technology
VI Teltow
Potsdamer Strasse 18
D-14513 Teltow, Germany
Tel: +49 (0) 3328.4784.17
Fax: +49 (0) 3328.4784.30
1. Wireless Reader / Interrogator generates RF signal (limited bandwidth) and transmits it by
Reader Antenna
SenGenuity’s ViSmart® solid-state viscosity sensor is based on bulk acoustic wave (BAW)
technology.
VI Hudson, Corporate Headquarters
267 Lowell Road, Suite 102
Hudson, NH 03051
Tel: 1.888.328.7661
Fax: 1.888.329.8328
describes the linear electromechanical interaction between the mechanical and
the electrical state in crystalline materials, which is known as piezoelectric
effect. The piezoelectric effect is a reversible process.
Direct Piezoelectricity Effect (DPE)
Bulk Acoustic Wave Technology for Viscosity Sensing
VI Shanghai
68 Yin Cheng Road(C), 22nd Floor
One LuJiaZui
Pudong, Shanghai 200120, China
Tel: +86 21 61946886
Fax: +86 21 61633598
The bulk of the liquid is unaffected by the acoustic signal as only a thin layer (in the order of
microns) is moved by the vibrating surface. The penetration depth into the fluid is ideal for
measuring the viscosity of homogeneous fluids like lubricants and inks. The viscosity measurement
will not be susceptible to large particles or debris because the small penetration depth makes them
virtually unnoticeable.
Temperature Sensor Systems
• Culinary Applications
• Rotating & Reciprocating Machinery
• Switchgear Control
• High Temperature Industrial Applications
VI Singapore
56 Serangoon North Avenue 4, #06-01
Singapore, 555851
Tel: +65 65551926
Fax: +65 65554377
The viscosity measurement is achieved by correlating the measured BAW electrical parameters
to the acoustic viscosity (AV) of the fluid. The general relationship between acoustic viscosity and
kinematic viscosity (measured in centi Stokes (cSt)) is:
4. Frequency of the received RF signal is indicative of measured temperature
www.sengenuity.com
Rev# 001
May, 2014
Acoustic Viscosity (AV) = Kinematic Viscosity x Density² (cSt x (g/cm³)²)
www.sengenuity.com
Bulk Acoustic Wave Viscosity Sensing Applications
SenGenuity Starter Kits
Printing Inks
Viscosity Sensors
Ideally suited for monitoring of water-based and solvent-based inks in the
flexographic and rotogravure printing industries.
Proper ink viscosity is critical to producing quality printed material. Too thin
ink may result in color inconsistencies, mottling and weak color print. Too
thick color may lead to adhesion issues, feathering and smearing.
Surface Acoustic Wave Temperature Sensing Applications
Temperature Sensors
SenGenuity Sensor Solutions
Application Validation
In the process of installing, configuring and managing viscosity data from
Once you are familiar with the capabilities of the ViSmart® Viscosity Sensor
the ViSmart® or temperature data from the TempTrackr™, you will gain a
System or the TempTrackr™ Temperature Sensor System, the Starter Kit
Ideally suited for applications such as food safety, cooking and storage control in
industrial, commercial and residential ovens and rotisseries where wired probes
cannot be used.
deep understanding of the sensors capabilities. With this knowledge, you
allows you to test the sensors as you see suitable. You gain immediate,
Features:
can customize a measurement and control solution.
first-hand feedback on the feasibility and the value .
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Advantages:
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Increased printing quality
Reduced set up times
Reduced scrap
Reduced machine downtime
Increased throughput
Cost savings
Features:
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Continuous on-line, in-line, real time measurement 24/7/365
Integrated temperature measurement
Reliable and Repeatable
Standard ½” NPT mounting
Easy integration for automated process and control
Various VisConnect® interface options
CE and ETL Listed safety certifications
Very low maintenance
Quick Data Acquisition
Decision Making
With a variety of sensor and user interfaces our starter kits allow you to
After examining the data, the Starter Kits provide a proof-of-solution that
choose the one which will help you to instrument your application and
can enable decision making and allow us to fulfill your specific needs and
begin collecting viscosity or temperature data, and characterize your
requirements. We will work closely with you to adapt our sensor solutions
opportunity.
to your application to give you the competitive edge you are looking for.
Constant temperature cycling, contamination and aging of lubricants
without appropriate condition monitoring may result in an increase in fuel
consumption and reduced output power or even worse a catastrophic event
such as the seizing of the engine or turbine.
Advantages:
• Continuous and instantaneous oil viscosity data feedback
• Trending of lubricant quality leading to the capability to
prognosticate failure
• Contamination detection (e.g. water, fuel or solvents)
• Onboard knowledge of lubricant condition
Features:
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Continuous on-line, in-line, real time measurement 24/7/365
Integrated temperature measurement
Reliable and Repeatable
Standard ½” NPT mounting
Easy integration for automated process and control
Various VisConnect® interface options
CE and ETL Listed safety certifications
Very low maintenance
Passive wireless food probe – no battery and no cable necessary
Electronic can be implemented easily
Temperature measurement range 0 to 120°C
Operable temperature range of probe 0 to 230°C
Easy to clean (dishwasher safe)
Environmentally friendly
Reading distance up to 1.5 meters
User friendly
Rotating & Reciprocating Machinery
Ideally suited for harsh, hazardous, inaccessible locations and the “hot spot” of
compressors and rotating machinery, where wired probes are not suitable.
ViSmart® Solid-State Viscosity Sensor
Sensor Modules
Features:
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 No battery, no cables needed
 All different sensor modules consists of the same fundamental
components:
» SAW sensor element (Ceramic package)
» Sensor module antenna
» Ground plane/cover
 Off the shelf solutions, as well as customized solutions available
 Typical temperature measurement range: -20 to 120°C
 Typical Accuracy: ±2°
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Real-Time viscosity and temperature sensing
Fluid Operating Temperature -15°C to 105°C
Once per second measurement rate
Only ø25.4 x 107.42mm in size (VS-25XX series)
1/2” NPT thread for easy mounting
IP67 Ingress protection rating
ATEX, CE, and ETL certifications
Lubricant Monitoring
Ideally suited for oil and lubricant condition monitoring in power generation
equipment, marine applications, and on & off road vehicles. These include
power plant engines, diesel generators, marine propulsion engines, wind
turbines, oil filtration systems, long haul trucks, agriculture and construction
equipment as well as jet turbines.
Culinary
Shunt-Diode Barrier
Reader PIF-Antenna
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Limits excessive energy supply in a hazardous environment
Maximum safe voltage 250V
DIN rail mount for easy installation
70.4 x 85 x 22.5 mm in size (HxDxW)
ATEX, CE, and ETL certifications
To be used in conjunction with SenGenuity’s ViSmart® VS-25XX
series and VisConnect®
Planar Inverted F-Shaped Antenna with excellent radiation pattern
Designed to operate with Wireless Sensor Reader_WSR-T2
Center frequency: 433MHz
Bandwidth: 20MHz
Gain (max): 3,5dBi
Installation: screw mount (use 3 x 5mm holes) or DIN rail mount (use clip)
Other antenna types (e.g. dipole) available
Passive and wireless sensor modules – no battery and no cable required
Temperature measurement range 0 to 140°C
Continuously monitoring, reporting and logging temperature data 24/7/365
Typical speed of rotation 600 / 1000 / 1200 rpm
Robust, reliable, stable – suitable for harsh environments
Sensor can be applied directly at critical location inaccessible to traditional
temperature sensors
• Enhanced machinery safety and process control
Switchgear Control
Ideally suited for Switchgear application to monitor the temperature of current
bus bars and breakers.
Features:
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Passive and wireless sensor modules – no battery and no cable required
Continuously monitoring, reporting and logging temperature data 24/7/365
Enhanced operator and asset safety - no flashover risk
Reduced labor and capital cost - minimum maintenance cost
Monitor locations inaccessible to traditional temperature sensors
Up to 12 sensor modules in one cabinet
Temperature measurement range -20 to 120°C
High Temperature Industrial Applications
VisConnect® Converter
Wireless Sensor Reader WSR-T2
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 Highly sophisticated SAW Sensor interrogation unit designed for
simultaneous multiple sensor module monitoring
 Supply voltage: 5V; 9…30V
 Multiple Interfaces: CAN; RS232; RS485; USB
 Frequency range:428-439,5MHz
 Reading distance up to 3m (dependent on RF environment)
 3 SMA Antenna connectors to interrogate up to 32 Sensor Modules
 Global usage with different certifications according FCC / CE
Provides viscosity and temperature readings recorded by ViSmart®
Supported protocols: CANopen, ASCII, MODBUS RTU and 4-20mA
Supported physical interface: CAN, RS485, RS232 and 4-20mA
Configurable node IDs and bit rates
Easy Mounting due to DIN rail mount
70.4 x 85 x 22.5 mm in size (HxDxW)
Supply voltage: 9…36 Vdc
Ideally suited for harsh, inaccessible and hot locations occurring in industrial
environments.
Features:
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Passive and wireless sensor modules – no battery and no cable required
Continuously monitoring, reporting and logging temperature data 24/7/365
Temperatures up to 600°C
Robust, reliable, stable – patented packaging technology for survival in harsh
and high temperature environments
• Sensor can be applied directly at critical location inaccessible to traditional
temperature sensors
• Enhanced machinery safety and process control

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