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The nodes contain an internal high capacity rechargeable battery.  The nodes are provided with an external power supply which is used to recharge these batteries.  The battery life of the internal battery is fully dependent on the data acquisition mode.  High speed streaming will consume the battery in hours while low duty cycling can operate months and months if a low sample rate is set.  The nodes may also be powered externally by an external battery or power supply.

V-Link-LXRS, SG-Link-LXRS, SG-Link-OEM-LS and SG-Link-OEM-LXRS support strain gauges.  Node Commander software contains a strain gauge ‘wizard’ which allows the user to calibrate the output of the strain gauges using an on-board precision shunt resistor.  With this calibration, the nodes can now output engineering units, i.e. microstrain.

 

The gateways (base stations and WSDA-1000) and the wireless nodes employ radios with these general specifications (see the individual product data sheet for any variations):

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 programmable from 0 dBm (1 mW) to 16 dBm (39 mW); European models limited to 10 dBm (10 mW)
RF data packet standard IEEE 802.15.4, open communication architecture
RF data downloading 8 minutes to download full memory
Range for bi-directional RF link programmable communication range from 70 meters to 2 kilometers

 

 

 

 

In FINITE sampling, the user sets a total number of samples to be taken which equates to a time period.  Because the sampling rate per second is known, the user can adjust the number of samples to be taken to determine how long the sampling period will be.

In CONTINUOUS sampling, the user does not set the total number of samples and therefore does not set the time of the sampling period.  By selecting CONTINUOUS sampling, the user is instructing the system to sample data until the user manually stops the sampling (via software), the power is cycled, the on-board datalogging memory is full, the battery dies, the power fails, etc.

LORD MicroStrain® Wireless Sensor Networks provide several data acquisition modes including:

  • Synchronized Sampling
  • Armed Datalogging
  • Streaming
  • Duty Cycle

See the particular wireless node for specifics.

 

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Contacts

  • LORD Sensing - Sales, 459 Hurricane Lane, Suite 102, Williston VT, 05495 USA
  • +1-802-862-6629 (United States)
  • http://www.microstrain.com