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SG-Link® Wireless Strain Node
Direct strain gauge input datalogging transceiver for use in high speed wireless
sensor networks.
Features and Benefits
- 2.4 GHz direct sequence spread spectrum radio is license free worldwide
- IEEE 802.15.4 open communication architecture
- Supports simultaneous streaming from multiple nodes to PC
- Datalogging rates up to 2048 Hz, storing up to 1,000,000 measurements
- Real-time streaming rates up to 4 KHz
- Communication range up to 70 m line-of-sight, 300 m with high gain antennas
- Regulated 3 volt sensor excitation supports most analog sensors
- On-board bridge completion resistors
- Includes internal resistor for wireless shunt calibration
- Low power consumption for extended use
- Internal rechargeable battery
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Introduction
With one differential channel, which includes full strain gauge
conditioning and programmable offset, and one single ended
channel, the SG-LINK® is compatible with most types of analog
sensor. It is fast, extremely versatile and designed to
operate as part of a high speed wireless sensor network.
Featuring 2 KHz sweep rates, combined with 2 MB flash
memory, these little nodes pack a lot of power in a small
package. With every node in the wireless network assigned a
unique 16 bit address, a single host transceiver can address
thousands of multi-channel sensor clusters.
The bi-directional RF communications link can trigger a sample
to be logged from 70 meters, or request real-time data
be transmitted to the host PC for data acquisition/analysis.
The frequency agile system enables simultaneous real-time streaming from up to 16 nodes in the 2.4 GHz range.
The scaleable system architecture and programmable sensor
interface enables a new generation of wireless sensor networks.
The SG-LINK® wireless strain node is compatible with a wide range of wheatstone
bridge type sensors, including strain gauges, displacement
sensors, load cells, torque transducers, pressure sensors,
accelerometers, geophones, temperature sensors, inclinometers,
and others.
A software development kit is available, which includes
fully-commented source code and a compiled executable
for Microsoft® Visual Studio C++ .NET 7.1, Microsoft® VB 6.0, Microsoft® VB.NET 2003, Microsoft® VB.NET 2005 and LabVIEW® 7.1.
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Applications
Condition-based monitoring of machines
Health monitoring of civil structures and vehicles
Smart structures and materials
Experimental test and measurement
Robotics and machine automation
Vibration and acoustic noise testing
Sports performance and sports medicine analysis
Distributed security networks
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Input Channels |
1 full differential input channel, 350Ω resistance or higher (with optional
bridge completion), 1 single ended input (0 - 3 volts maximum), and internal temperature
sensor |
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Temperature Sensor |
-40˚C to +70˚C range, typical accuracy ±2˚C (at 25˚C) |
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Anti-aliasing filter bandwidth |
-3 dB cutoff at 250 Hz (factory adjustable) |
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Measurement Accuracy |
± 0.1% full scale typical |
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Resolution |
1 bit: 0.024%
1 microstrain typical for 3 wire quarter bridge strain gauge (when used in accordance with MicroStrain® recommendations) |
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DC Bridge Excitation |
+3 volts DC at 50 mA maximum (pulsed to sensors for samples rates of 100 Hz and below to conserve power) |
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Programmable Gain |
Software programmable: 104 to 1800 |
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Programmable Offset |
Software programmable |
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Analog to Digital (A/D) Converter |
Successive approximation type, 12 bit resolution
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Data Storage Capacity |
2 megabytes (approximately 1,000,000 data points) |
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Data Logging Mode |
Log up to 1,000,000 data points (from 100 to 65,500 samples or continuous) at 32
Hz to 2048 Hz |
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Sensor Event Driven Trigger |
Commence datalogging when threshold exceeded |
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Real-time Streaming Mode |
Transmit real time data from node to PC - rate depends on number of active channels:
1 channel - 4 KHz, 2 channels - 2 KHz, 3 channels - 1.33 KHz |
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Low Duty-cycle Mode |
Supports multiple nodes on single RF channel |
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Synchronization Between Nodes |
Datalogging 4 sec 50 ppm, LDC mode time stamped at PC |
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Sample Rate Stability |
25 ppm for sample rates > 1 Hz, 10% for sample rates < 1 Hz |
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Wireless Shunt Calibration |
Channel 1. Internal shunt calibration resistor 499 KΩ |
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Radio Frequency (RF) Transceiver Carrier |
2.4 GHz direct sequence spread spectrum, license free worldwide (2.405 to 2.480
GHz) - 16 channels, radiated power 0 dBm (1mW) |
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RF Data Packet Standard |
IEEE 802.15.4, open communication architecture |
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RF Data Downloading |
8 minutes to download full memory |
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Range for Bi-directional RF Link |
70 m line-of-sight, up to 300 m with optional high gain antenna |
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Internal Li-Ion Battery |
3.7 volt lithium ion rechargeable battery, 250 mAh capacity
Customer may supply external power from 3.2 to 9 volts |
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Power Consumption |
SG-Link® node only: real-time streaming - 25 mA, datalogging - 25 mA, sleeping -
0.5 mA
External sensors: 350 Ω strain gauge - 8 mA, 1000 Ω strain gauge
- 3 mA (add sensor consumption to above to calculate total power consumption) |
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Operating Temperature |
-20˚C to +60˚C with standard internal battery and enclosure, extended temperature
range optional with custom battery and enclosure. -40˚C to +85˚C for electronics
only |
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Maximum Acceleration Limit |
500 g standard (high g option available) |
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Dimensions |
58 mm x 50 mm x 26 mm (enclosure without antenna
46 mm x 36 mm x 16 mm (circuit board assembly only)
For dimensioned print go to Documentation tab |
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Weight |
50 g (with enclosure)
17 g (circuit board assembly only) |
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Enclosure Material |
ABS plastic |
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Software |
Node Commander® Windows XP/Vista compatible |
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Compatible Base Stations |
USB, RS-232, Analog, WSDA® |
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General Documentation
Mechanical Prints
Technical Notes
FAQ's
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SG-Link® Starter Kits
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SG-Link 1 input channel, USB base station starter kit
SG-LINK-1CH-2400-SK2
Includes
(2) SG-Link-1CH-2400-M, (1) USB base station, (1) USB cable, (1) power supply, (3) antennae, Windows XP compatible software
Part Number: 6308-0042
Online price: $2095.00
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MicroStrain has identified your location as
United States. If this is incorrect please contact
sales at 802-862-6629 or sales@microstrain.com
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SG-Link 1 input channel, Analog output base station starter kit
SG-LINK-1CH-2400-SKA
Includes
(1) SG-Link-1CH-2400-M, (1) Analog output base station, (1) power supply, (1) Analog base station power supply, (2) antennae, Windows XP compatible software
Part Number: 6308-0011
Online price: $2145.00
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MicroStrain has identified your location as
United States. If this is incorrect please contact
sales at 802-862-6629 or sales@microstrain.com
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