Laser Distance Measurement Sensor LDM41/42P

Theory of Operation

The LDM 41/42 P Laser Distance Measurement Sensor with Profibus DP interface is designed for

distance measurement applications in an industrial environment. The LDM 41/42 P works based on

comparative phase measurement. To achieve this, it emits a visible Laser beam with different

modulation frequencies. The target being measured returns diffusely reflected light that is

subsequently compared with a reference signal. Finally, a microprocessor uses the recorded phase

shift to calculate a required distance with mm accuracy.

The sensor LDM 41 P distinguishes itself through a high precision as well as a big independence of

the surface of the measured object. The LDM 42 P is design for fast measurement on a white target.

The red, well visible Laser beam allows a simple alignment. 

Measuringaccuracy: 3mm(+15°Cupto+30°C),??5mm(-10°Cupto+50°C)

                                  2mmunderdefinedmeasuringconditions 

Resolution: max.0.1mm,userscalable

Repeatability: 0.5mm

Operatingmodes: DistancetrackingDT,DW,DS,DXonlyLDM42P,single

                             measurementDM,triggermodeDF

Measuringtime: 0.24upto6sadjustableorautomaticinDTmode

                           0.1sinDWmodeatwhitesurface

                           20msinDXmodeatwhitesurface(onlyLDM42P)

LaserClass: LaserClass2

                     regardingDINEN60825-1:2001-11,??1mW,

                     650nm(visiblered)

Laserdivergence: 0,6mrad

Businterface: ProfibusDP

                       ??   ProfibusDPNormslave

                       ??   Autodetectupto12MBit

                       ??   ID-Number0x2079(8313)

                       ??   13ByteIN,1ByteOUT

Datainterface: RS232orRS422

                         ??   9600Baud,ASCII,8N1

                         ??   ProgrammingwithWindowsterminalprogram(forexample

                               LDMToolorHyperTerminal)

                         ??   AfterconnectiontoProfibusmasterRXlinewillbeswitchedoff

Supplyvoltage:10upto30VDC

Powerconsumption: <3,5Wfordistance  trackingand<3WLaseroff(Stand-by)

Operatingtemperature: -10°Cupto+50°C

Storagetemperature: -40°Cupto+70°C

Dimensions:approx.212x96x50(LxWxH)inmm

Mounting: 100x85inmm,4holesforM6screws

Weight/protectionclass:Aluminumapprox.850g/IP65

EMC: EN61000-6-2andEN55011

Shockresistance: 10g/6mspersistenceshockDIN***9022-3-31-01-1

scopeofdelivery: Sensorwithpowercable5mandusermanual

Options: Programmingcable,connectionplugs,Profibusterminator,

softwareLDMTool,reflectorfoils,filterandprotectionglassandothers

Applications

•   Supervisionofcraneandconveyors
•   Distanceandpositionmeasurement
•   Level-measurement
•   Supervisionofsecurity-relevantparts
•   Supervisionofliftsystems/ liftlevelmeasurement/elevatorpositioning
•   Positioningcontrol
•   Diametermeasurementofcoils

Characteristics

•   Millimeter precisemeasurementatvarioussurfaces(LDM42Ponlyforwhitesurface)
•   Longrangereflector-lessdistancemeasurement,withadditionalreflectors mountedontotarget over100m

•   Highavailabilityunderoutdoortemperatureconditionswithhighprecision
•   Bigsupplyvoltagerange10Vuntil30VDC
•   SafeusebecauseofLaserClass2
•   SimplealignmentwithavisibleLaserbeam
•   RS232datainterfaceforprogramming
•   SimpleparametersetupwithaPCorlaptop
•   Measuredvaluesaredisplayedinmeters,decimetre,centimetre,feet,inch...anddifferent resolutionsduetofreescaling

•   StableandeasytoinstallenclosurewithprotectiongradeofIP65
•   DirectconnectiontoProfibusDP