NEW VERSION
There is a new version of this product available. The product on this page has been discontinued and the datasheet and manual are provided for informational purposes.
Product no longer stocked – limited availability
Contact for pricing and lead time--a minimum order quantity may apply
Contact for pricing and lead time--a minimum order quantity may apply
The SG-Link® -RGD -LXRS® ia a versatile, ruggedized four-channel analog sensor node with integrated triaxial accelerometer.
Product Highlights
- Four analog input channels, integrated three-axis accelerometer, and an internal temperature sensor
- Integrated strain sensor signal conditioning, embedded processing, and environmentally hardened form factor ideal for permanently mounting over strain gauges
- Supports conventional bonded foil, piezoelectric-resistive, Wheatstone bridge, and modular Columbia Research
- Labs-type strain gauges
- Integrated triaxial accelerometer with MEMS technology and +/- 16 g range
- User-programmable sample rates up to 4096 Hz
Wireless Simplicity, Hardwired Reliability
High Performance
- Node-to-node synchronization up to ±32 microseconds
- High resolution data with 16-bit A/D converter
- Scalable, long range wireless sensor networks up to 2 km
Ease of Use
- Flex bonding cable and node form factor allow quick installation over existing strain gauges
- Low profile, environmentally sealed enclosure
- On-board shunt calibration
Cost Effective
- Reduction of costs associated with wiring
- Out-of-the box wireless sensing solution reduces development and deployment time.
| General | |
|---|---|
|
Sensor input channels |
Differential analog, 4 channels |
|
Integrated sensors |
Triaxial MEMS accelerometer, 3 channels Internal temperature, 1 channel |
|
Data storage capacity |
2 M bytes (up to 1,000,000 data points, data type dependent) |
| Analog Input Channels | |
|
Measurement range |
Differential: full-bridge, ≥ 350 Ω (factory configurable) |
|
Accuracy and resolution |
± 0.1% full scale typical, 16 bit resolution |
|
Anti-aliasing filter bandwidth |
Single-pole Butterworth -3 dB cutoff @ 250 Hz |
|
Bridge excitation voltage |
+2.7 V dc, 50 mA total for all channels (pulsed @ sample rates ≤ 16 Hz to conserve power) |
|
Measurement gain and offset |
User-selectable in software on differential channels gain values from 104 to 1800 |
| Integrated Accelerometer Channels | |
|
Measurement range |
± 16 g |
|
Accuracy and resolution |
± 4 mg, 13 bit resolution |
| Integrated Temperature Channel | |
|
Measurement range |
-40 °C to 85 °C |
|
Accuracy and resolution |
± 2 °C (at 25 °C) typical, 16 bit resolution |
| Sampling | |
|
Sampling modes |
Synchronized, low duty cycle, datalogging |
|
Sampling rates |
Continuous sampling: 1 sample/hour to 512 Hz Periodic burst sampling: 32 Hz to 4096 Hz Datalogging: 32 Hz to 4096 Hz |
|
Sample rate stability |
± 3 ppm |
|
Network capacity |
Up to 2000 nodes per RF channel (and per gateway) depending on the number of active channels and sampling settings. Refer to the system bandwidth calculator: http://www.microstrain.com/configure-your-system |
|
Synchronization between nodes |
± 32 μsec |
| Operating Parameters | |
|
Radio frequency (RF) transceiver carrier |
2.405 to 2.470 GHz direct sequence spread spectrum over 14 channels, license free worldwide, radiated power programmable from 0 dBm (1 mW) to 16 dBm (39 mW); low power option available for use outside the U.S.- limited to 10dBm (10mW) |
|
Range for bi-directional RF link |
70 m to 2 km line of sight with RF power setting |
|
RF communication protocol |
IEEE 802.15.4 |
|
Power source |
Replaceable 3.7 V dc, 1.7 Ah Tadiran TL-5935 1/6 D-cell battery |
|
Power consumption |
960 uA ( 3.46 mW) @ 3.6 V dc, 32 HZ, 3 ch, no duty cycling 10.6 mA (38.16 mW) @ 3.6 V dc, 256 Hz, 3 ch, no duty cycling 4.0 mA (14.4 mW) @ 3.6 V dc, 256 Hz, 1 ch, no duty cycling |
|
Operating temperature |
-40 ˚C to + 85 ˚C |
|
Acceleration limit |
500 g standard (high g option available) |
| Physical Specifications | |
|
Dimensions |
101 mm x 46 mm x 26 mm |
|
Weight |
150 g (including battery) |
|
EMI/EMC rating |
MIL-STD-461F |
|
Enclosure material |
Clear polycarbonate |
| Integration | |
|
Compatible gateways |
All WSDA® base stations and gateways |
|
Compatible sensors> |
Bridge type analog sensors |
|
Connectors |
Flex cable terminal/solder pads (flex cable included) |
|
Shunt calibration |
Internal shunt calibration resistor 499 KΩ, differential channels< |
|
Software< |
SensorCloud™, SensorConnect™, Node Commander®, Windows 7 (or newer) |
|
Software development |
Open-source MicroStrain Communications Library (MSCL) with sample code available in C++,Python,and.NET formats (OS and computing platform independent): http://lord-microstrain.github.io/MSCL/ |
|
Regulatory compliance |
FCC (U.S.), IC (Canada), ROHS |
General Documentation
- SG-Link® -RGD -LXRS® Datasheet
- Node Commander Wireless Sensing Software User Manual
- Wireless Products Comparison
Mechanical Drawings (Uncontrolled)
- SG-Link® -RGD -LXRS® Mechanical Drawing
- SG-Link® -RGD -LXRS® Accelerometer Orientation
- SG-Link® -RGD -LXRS® Wiring Diagram
Technical Notes
What is Multipath?
Multipath is the phenomenon whereby a radio signal arrives at a receiver’s antenna by more than one path. This occurs by the reflection, diffraction, or scattering of radio waves from atmospheric ducting, reflection from water bodies or terrestrial objects (like mountains), etc.
Does Multipath impact signal strength?
Yes, multipath propagation of radio signals causes fading of the transmitted signal, which can be indicated by fluctuations in signal strength when received by the signal receiver.
How do I mitigate Multipath?
Pe-position base station or node to mitigate possible multipath interference.
Ensure a clear path to the antenna for the strongest signal, enhancing the strength of the strongest signal AND reducing the strength of the weaker signals.
Learn More: Mutipath Propagation
The WSDA-RGD (with internal GX3 inertial sensor) is configured to produce the following messages on startup.
GPS Data (1 Hz):
- UTC Time
- LLH Position
- NED Velocity
AHRS Data (100 Hz):
- Euler Angles
From this output the WSDA logs:
GPS (1 Hz):
- latitude
- longitude
- height above ellipsoid
- height above MSL
- horizontal accuracy
- vertical accuracy
- speed
AHRS (100 Hz):
- roll
- pitch
- yaw
The WSDA-RGD does not log any data until it gets a valid time, if it is set to get time from GPS only it will not log any output from the GX3 until the UTC timestamp from the GX3 is valid, even though the GX3 is producing valid AHRS data.
This data is not user configurable and is not available as a live stream through LiveConnect.
All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).
This channel setting was established during 2012.
Previously all wireless products were set to channel 25 (2.475 GHz).
If you are mixing new nodes and base stations with older nodes and base stations, please be cognizant of these different channel settings.
The Node Discovery function of Node Commander will help you sort out which nodes are on what channels; Node Discovery is channel independent and allows the base station to communicate with any node, no matter what channel it is on
Sampling methods such as synchronized sampling, low duty cycle, network broadcast, etc. require that all nodes are on the same frequency so you will want to insure that you have adjusted the channels settings of the nodes to suit.
