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8401-0010
Wireless Sensor Networks Technical Note
LORD Corporation, MicroStrain Sensing Systems
Using a Load Cell with V-Link
Overview
MicroStrain's
V-Link
Sensor Node has 4 differential input channels (strain
channels) designed to support strain gauges, load cells, etc.
Futek's
LSB300
Series is an S Beam Load Cell designed for
use in platforms, silos and scales; for purposes of this
discussion, we are using the 200 lbs capacity, full bridge model
FSH02077.
This technical note presents a step-by-step approach to
connecting the load cell to the V-Link
cell, and operating the system.
™
LXRS
, Node Commander
assumed. This technical note is also applicable to SG
operations.
Wiring Connection
The Futek load cell presents a 5 foot, polyurethane sheathed, shielded, connection
flying leads. Table 1 describes the individual leads' purpose and nomenclature.
1
Red
2
Black
3
Green
4
White
5
Orange
6
Blue
Shield
Silver
•
To connect to the V-Link
White leads.
•
Cut back the Orange and Blue leads and secure them to prevent shorting.
•
Strip back each of the 4 remaining leads approximately ½".
•
Tin (with solder) each of the 4 leads to insure a good grip in the V-Link
block connector.
• It is also strongly recommended that you solder the shielding of the cable to the Black
lead as shown in Figure 1. This will reduce noise in the system.
•
Connect the 4 leads of the load cell to the V-Link
Figure 2.
•
For this example we are connecting to differential input channel 1 of the V-Link
®
™
-LXRS
8 Channel Wireless Analog
®
-LXRS
Familiarity with the V-Link
®
software and load cell operation is
+EXC
-EXC
+SIG
-SIG
+SEN
-SEN
Grounded
Table 1: Futek Load Cell Cable Leads
®
™
-LXRS
®
™
-LXRS
™
, calibrating the load
®
-Link-LXRS
, we need only deal with the Red, Black, Green, and
®
-LXRS
®
-
™
cable
+Excitation
-Excitation
+Signal
-Signal
+Sense
-Sense
Shield
®
-LXRS
™
as shown in Table 2 and
®
-LXRS
with 6
™
terminal
™
.
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Table of Contents
Related Manuals for MicroStrain V-Link-LXRS
Summary of Contents for MicroStrain V-Link-LXRS
- Page 1 8401-0010 Wireless Sensor Networks Technical Note LORD Corporation, MicroStrain Sensing Systems ® ™ Using a Load Cell with V-Link -LXRS Overview ® ™ MicroStrain’s V-Link -LXRS 8 Channel Wireless Analog Sensor Node has 4 differential input channels (strain channels) designed to support strain gauges, load cells, etc.
- Page 2 Load Cell Lead Load Cell Lead Function V-Link Function V-Link Pin +Excitation Black -Excitation Green +Signal White -Signal ® ™ Table 2: Load Cell Cable Connection to V-Link -LXRS ® ™ Figure 1: Shielding and 4 Leads of Load Cell Figure 2: Leads Connected to V-Link -LXRS ®...
- Page 3 • Click OK to c lose the Channel 1 Configuration screen. • Click Apply. • Click the Streaming tab. • Uncheck the Continuous Streaming checkbox. • Enter a value of 15000 Sweeps (~20 seconds). • Click Apply and click OK to close the Configuration scre •...
- Page 4 • Launch ® Node Commander software. • Establish communication with the ® ™ V-Link -LXRS as normal. • Proceed to the Configuration screen. • Continue Channel Configuration screen. • Select A/D Value under Class and Bits under Units in the Conversion Coefficients frame as shown.
- Page 5 Channel 1 Configuration screen. • Modify the Offset by increasing or decreasing the value to zero the output. • Hang different weights on the load cell to verify calibration throughout its range. Using Factory Calibration of Load Cell • The load cell in this example has been calibrated at the factory in the tension direction. •...
- Page 6 • Note: You should apply at least ten loads (even more is better) over the entire range of the load cell rating to increase the accuracy of the calibration. Support MicroStrain support engineers are always available to expand on this subject and support you in any way we can. LORD Corporation...
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