User's Manual

1608 4th Street Suite 200 Berkeley CA 94710| [e-mail] | P 510.548.4620 F 510.548.8264
1608 4th Street Suite 200 Berkeley CA 94710
|
[e-mail]
|
P 510.548.4620 F 510.548.8264
Functions / Features
Lower power consumption
3-axis magnetometer for vehicle detection
• 128Hzsamplingrate
• Countandpresencedetectionmodes
• Modesforbicycleandmotorcycledetection
Flush mount or up to 7" depth in-pavement
installation with no wires or lead-in cabling
Fast and simple installation
• Installsinlessthan10minutesinsmall
holeusingahammerorcoredrill
– 4”(10cm)diameter;amaximumof7”(17.8cm)
deep
– Coveredwithfast-dryingepoxy
• Minimallaneclosuretime
• Nosawcuts
Expected 10 year battery life
• Ruggedmechanicaldesign
• Auto-calibration
Reliable 2-way radio communications with access
point
• Uniquelyaddressableandcongurable
• Firmwarecanbeupgradedover-the-air
Readily deployed where other systems cannot be
used
• Splitroadways
• Highwatertables
• Damagedpavement
MAG2/Grind Resistant (GR) Sensor
The Sensys Networks VDS240 Wireless Vehicle Detection
System useswirelessmagneto-resistivesensorstodetectthe
presenceandmovementofvehicles.Thesensors–installedinholes
coredintheroadwayandcoveredwithepoxy–transmitdetection
datainreal-timevialow-powerradiotechnologytoanearbySensys
Networksaccesspoint.Vehicledetectionsarefurtherrelayedtoa
trafcsignalcontroller,remotetrafcmanagementcenter,orother
system.
The new MAG2/GR sensordevelopedbySensysNetworksutilizes
thenextgenerationofRFchipsetsandcircuitry.TheMAG2sensors
areinstalledushwiththeroadwaysurfaceinplasticshells.The
plasticshellsenabletheremovalandreplacementofsensorsduring
roadwaymillingoperations.TheGRsensorsareinstalledatdepth
ofupto7inchesbelowthetopoftheroadwaysurfacewithout
plasticshells.Sensorsinstalledatthesedepthsdonothavetobe
removedandreplacedduringmostroadwaymillingoperations.
Intypicaltrafcmanagementapplications,asensorisplacedin
themiddleofatrafclanetodetectthepresenceandpassageof
vehicles.Vehiclespeedsandlengtharemeasuredbytwosensors
installedinthesamelanewiththeexactdistancebetweenthem
conguredinsoftware.Therecommendeddistancebetween
sensorsdependsontherangeofexpectedspeedstobemeasured:
fortypicalfreewayapplications,aseparationof20to24feet(6.1
to7.3meters)isrecommended;fortypicalarterialapplications,a
separationof10to12feet(3.1to3.7meters)ispreferred.
Advanced Magnetometer-Based Vehicle Detection.
Thestate-of-the-artmagneto-resistivesensingdevicesineach
wirelesssensormeasurethex-,y-,andz-axiscomponentsofthe
Earth’smagneticeldata128Hzsamplingrate.Asvehiclescome
withinrange,changesinthex,y,orzaxesofthemeasured
magneticeldbecomeapparent.Whennovehiclesarepresent,
sensorscontinuallymeasurethebackgroundmagneticeldto
estimateareference.Eachsensorautomaticallyself-calibratesto
thelocalenvironment,andtoanylong-termvariationsofthelocal
magneticeld,byallowingthisreferencevaluetochangeovertime.
Types of MAG2/GR Sensors:
VSN240-F-2
• Flush-mountwirelesssensorforin-pavementinstallation
• For allfreeway,arterial,andsignalcontrolapplications
VSN240-T-2
• Flush-mountwirelesssensorforin-pavementinstallation
• For signalcontrolapplicationsonly
VSN240-F-GR
• Forupto7"depthin-pavementinstallation
• For allfreeway,arterial,andsignalcontrolapplications
VSN240-T-GR
• Forupto7"depthin-pavementinstallation
• For signalcontrolapplicationsonly