The Watt-Link™ -LXRS® is a line powered node for AC power, phase, current, and frequency monitoring, with low duty cycle and synchronized sampling options.

Product Highlights

  • Configurable AC line voltage inputs for measurement ranges of 120 to 600 VAC, 1 to 3 phases, and all standard wiring configurations
  • Three current transformer inputs to monitor AC loads
  • Designed for collection of local and remote time synchronized power and energy measurements without costly installation and maintenance of sub-panels
  • User selectable monitoring settings such as measurement type, current transformer ratings, sample rates, and more

Datasheet Manual

Wireless Simplicity, Hardwired Reliability

High Performance

  • Node-to-node synchronization up to ±32 microseconds
  • Scalable, long range wireless sensor networks up to 2 km
  • Lossless data throughput under most operating conditions

Ease of Use

  • Easy to install in existing electrical panels
  • Remotely configure nodes, acquire and view sensor data with Node Commander®.
  • Optional web-based SensorCloud™ interface optimizes data storage, viewing, and analysis.
  • Easy integration via comprehensive SDK
  • Line-powered for long-term deployment

Cost Effective

  • Reduction of costs associated with wiring
  • Volume discounts

General

Sensor input channels

AC line voltage, 3 channels
Current transformer, 3 channels

Options

AC input voltage range and phase configuration
(specified by the node model number)

Measurement values

true RMS power (Watts, all phases & sum), reactive power (VAR, all phases & sum), power factor (all phases & sum)

true RMS energy (KWh , all phases & sum), reactive energy(KVAR-hours, all phases), AC Frequency, computed RMS current (all phases), demand, peak demand

AC Line Voltage Input

Measurement range

120 V ac to 600 V ac, single to 3 phase, wye (star),delta, and 2 to 4 wire configurations available (depending on the node model), measures -20% to +15% of the nominally rated voltage

Accuracy

± 0.5 %

Frequency

48 Hz to 62 Hz

Current Transformer (CT) Inputs

Measurement range

1 A to 250 A (depending on CT type and configuration)

Accuracy

± 0.5 % to ± 3 % of reading
(depending on operating configuration)

CT operating voltage

0.333 VAC nominal; 0 to 0.5 VAC operating; 3 VAC maximum

Sampling

Sampling modes

Synchronized, low duty cycle

Sampling rates

Continuous sampling: 1 sample/hour to 1 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.A.- limited to 10 dBm (10 mW)

RF communication protocol

IEEE 802.15.4

Range for bi-directional RF link

70 m to 2 km line of sight with RF power setting

Power source

line powered

Power consumption

10-30 mA

Operating temperature

-30 ˚C to + 55 ˚C

Altitude limit

up to 2000 meters

Physical Specifications

Dimensions

151 mm × 85 mm × 38 mm without antenna

Weight

305 grams

Environmental rating

indoor use (unless in a NEMA 3R/4 rated electrical enclosure )

Flame resistance rating

94V-0, IEC FV-0

Enclosure material

high impact ABS plastic

Integration

Compatible gateways

All WSDA® base stations and gateways

Compatible sensors

UL recognized current transformers including split core (opening) types (available from LORD MicroStrain® ), other options available on request

Connectors

Euroblock style pluggable screw terminal blocks
Green: 22 to 12 AWG (1.0 to 3.2 mm), 600 V
Black: 22 to 12 AWG (1.0 to 3.2 mm), 300 V

Software

SensorCloud™, Node Commander®, WSDA® Data Downloader, Live Connect, Windows XP/Vista/7 compatible

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), UL (U.S. and Canada), ROHS, CE

Models

3Y-208

Line-to-Neutral: 120 VAC

Line-to-Line: 208 to 240 VAC

1 phase, 2 wire, 120 V with neutral
1 phase, 3 wire 120/240 V with neutral
3 phase, 4 wire, wye, 120/208 V with neutral

3Y-400

Line-to-Neutral:230 VAC

Line-to-Line: 400 VAC

1 phase, 2 wire, 230 V with neutral
3 phase, 4 wire, wye, 230/400 V with neutral

3Y-480

Line-to-Neutral: 277 VAC

Line-to-Line: 480 VAC

3 phase, 4 wire, wye, 277/480 V with neutral
1 phase, 2 wire 277 V with neutral

3Y-600

Line-to-Neutral: 347 VAC

Line-to-Line: 600 VAC

3 phase,4 wire, wye, 347/600 V with neutral

3D-240

Line-to-Neutral: 120 to 140 VAC

Line-to-Line: 208 to 240 VAC

1 phase, 2 wire, 208 V (no neutral)
1 phase, 2 wire, 240 V (no neutral)
1 phase, 3 wire 120/240 V with neutral
3 phase, 3 wire, delta, 208 V (no neutral)
3 phase, 4 wire, wye, 120/208 V with neutral
3 phase, 4 wire, delta, 120/208/240 V neutral

3D-400

Line-to-Neutral: 230 VAC

Line-to-Line: 400 VAC

3 phase, 3 wire, delta, 400 V (no neutral)
3 phase, 4 wire, wye, 230/400 V with neutral

3D-480

Line-to-Neutral: 277 VAC

Line-to-Line: 480 VAC

3 phase, 3 wire, delta, 480 V (no neutral)
3 phase, 4 wire, wye, 277/480 V with neutral
3 phase, 4 wire, delta, 240/415/480 V neutral

 

In general 802.15.4 and WiFi (802.11) coexsist without much interference to either type of signal.  However, physical placement of wireless routers and WSDA -base stations may require the selection of "prefered" channels.   There are only two (2) 802.15.4 channels where WiFi DOESN’T share the same frequency, 15 and 20.

Typically, Wifi APs default to channel 6.

 

*note: channel 25 and 26 are not available with current Lord Microstrain wireless technology

The % bandwidth has to do with how many nodes/channels you can use at one time.  When setting up a Synchronized Sampling network, Node Commander will interrogate each node and assign transmission slots for them to send data to the base station.  This is designed to keep the nodes from broadcasting at the same time and causing data loss.  The more channels, and higher sample rate of a node will require more transmission slots, thus higher % of available bandwidth used.

The most common cause of this issue is that the customer connects the WSDA directly to the PC via the ethernet cable without setting the WSDA -1000 up for Static IP first.  If you refer to page 3 of the quick start guide http://files.microstrain.com/WSDA-1500_QSG_(8501-0057).pdf

To connect to the gateway Control Panel through Live Connect™ an initial connection to a DHCP enabled network is required.

1. Connect the host computer and gateway to the DHCP network, and apply power to the gateway.

Verify the gateway status indicator shows that it is on and has completed the boot up process.

 

This means that the WSDA and the computer needs to be connected to a device (like a router) that will assign an IP address to it.  Once this is done the user will be able to log into the WSDA web control panel (using the router assigned IP), and change the network mode to Static IP in the configuration screen.  They would then need to change the network card of the computer to a complementing Static IP.  After this is done the user should be able directly connect the WSDA to a computer.

Excel displays our time stamp incorrectly.  If you were to open the data file in Notepad you would see the correct time format.  To correct the data in Excel, Highlight all of column A, right click on the highlighted region and select Format Cells.  Under the Number tab select Custom, Scroll to the bottom of the list that appears and select “m/d/yyyy h:mm”.  You will need to add “:ss.000” to the end of this, so it looks like this “m/d/yyyy h:mm:ss.000” .  Setting the cells to this will give you the highest resolution that Excel can show.

We use Universal Coordinated Time (UTC) to collect data on all of our devices.  There is no provision to set the time to a local time zone. 

In Node Commander software, on the analog pairing screen, there is a check box for "Float". What is the function of this check box?

 

 

 

If the node is configured to send data to the base station in floating point mode, you need to enable this checkbox and set the 0-3 volt scaling.

 

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.

As a general rule, you can calculate the battery life of a wireless node by dividing the amp hours of charge on the battery by the amps consumed during sampling.

Using the V-Link-LXRS as an example, we read in the data sheet (http://files.microstrain.com/V-Link_LXRS_datasheet.pdf) that the internal rechargeable battery has a nominal charge of 650 mAh (milliamp hours).  We next go to the V-Link-LXRS power profile (http://files.microstrain.com/V-Link-LXRS-Power-Profile.pdf) and we read that the V-Link-LXRS consumes 12.816 mA when sampling a 350 ohm strain gauge on 1 channel at 128 Hz.  By dividing 650 mAh by 12.816 mA, we find that the battery will last approximately 50 hours before needing recharge.

Yes!

However, new LXRS functions such as synchronized sampling, beaconing, etc. will not be available for your older node.

 

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).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

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).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

 

 

 

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).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

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.

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.

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.

The wireless node's effective download rate is ~9.2 kBps, or 73.6 kbps.  In perfect wireless conditions, a node's full 2MB memory can be downloaded in approximately 3.7 minutes.  While 250 kbps is the radio transmission rate, there are others variables that factor into the effective download rate including memory read time, packet overhead, radio acknowledgments, and base station to PC communication.   

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