Strain Gauge Wireless SenSpot™
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SenSpot™ Wireless Axial Strain Gauge Ultra-Low Power Precision Sensing & Wireless Communication Typical Applications Structural Health Monitoring (Airplanes, Bridges, Buildings, Cranes, Tunnels, Machines, etc.) Fatigue Analysis, Bridge Load Rating, Fracture Critical Monitoring, Extreme Load Tests Long battery lifetime (10 years, typical) Small size and light weight High Accuracy: 1 microstrain typical resolution Wireless communication: no wiring needed High-rate data transmission triggered by sudden strain changes: o Perfect for recording the waveform of a sudden strain change (e.g., strain event) caused by live load (e.g., heavy trucks passing over a bridge, wind gust, loading cycles). o User adjustable sampling rate for event detection and high-rate data from 10 to 100 samples per second o User adjustable triggering threshold from 8ustrain to 512ustrain for detecting strain event and rosette which consists of three strain gauges). Adjustable sampling interval: The regular sampling interval can be adjusted remotely by user from 50ms (20 samples/sec) to 15sec Different surfaces: Can be used for strain measurement on different surfaces such as steel, Aluminum, Concrete and wood Adjustable transmission interval: Can be adjusted remotely by user from 12sec to 360sec. Easy mounting: o Self-adhesive, no drilling is required (on metallic/smooth surfaces) o Flange-mount (on concrete, wood) Quick installation: 5-6 minutes High compatibility: integrates with thirds party strain transducers (120 Ohm, 350 Ohm, 700 Ohm, full-bridge, half-bridge, quarter-bridge Complementary sensing: the ambient temperature is also measured for reference Dimensions: o Wireless transmitter: 50mm (1.96”) x 50mm (1.96”) x 34mm (1.34”) o Strain Gauge sensor: 76.2mm (3”) x 33.4mm (1.3”) x 10mm (0.4”) Weight： about 147 g (5.19 oz.) o Wireless transmitter: 120 g (4.23 oz.) o Strain transducer: 17 g (0.6 oz.) Operating temperature: (-40 °F to +150°F) Long communication range: 1.0km free space

one second pre-event together with eight seconds of post-event data is transmitted with high sampling rate of 40 samples/s. In this case, the user can capture the whole strain waveform of the event. In many applications where the SenSpotTM is deployed on a bridge structure, these events happen when a very heavy truck passes the bridge. As a result, the transportation authorities in charge of maintaining the bridge can find out when and how many of heavy trucks have passed the bridge in certain time interval. This capability is particularly useful for fatigue analysis when the number of high...

Wireless Transmitter Dimensions The wireless transmitter is universal and it reads the analog measurement from the sensing element and transmits the digitized data wirelessly to SeniMaxTM Gateway or to USB-Sink receiver. These SenSpotTM sensors can be attached with the adhesive on the enclosure (e.g., on metallic surfaces) or it can be bolted (on concrete) as well. Figure 1: Wireless transmitter dimensions for strain gauge SenSpot . All dimensions are in mm [inch]. Email: info@resensys.com

Strain Gauge Sensing Element Dimensions The strain gauge sensing element produces the strain analog signal through its cable after it gets the excitation signal from the wireless transmitter part. This sensor is self-adhesive and it is meant to be used on steel structures. Figure 2: Strain gauge SenSpot sensing element dimensions. All dimensions are in mm [inch]. Email: info@resensys.com

The data shown in SenScope™ Figure 3: High-rate strain measurements for a Type D (Regular) of strain gauge Figure 4: High-rate (blue) and triggered-burst (red) strain measurements for a Type C (Event Detection) of strain gauge Email: info@resensys.com

Figure 5: High-rate strain measurements for a Type R (Rosette) of strain gauge Email: info@resensys.com