3M 2250M-iD, 2273M-iD manual Induction Method, Non-Sweeping Passive Induction Mode Locating

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C. Induction Method

If you cannot make a direct connection, or use the 3M™ Dyna-Coupler clamp to apply a locating signal on the target, use the induction method. When nothing is plugged into the Output Jack [T-6] of the transmitter the unit will be placed into induction mode when it is turned on. This method uses the internal coil of the transmitter to generate a magnetic field. This is the least preferred method of applying a signal on a target conductor because it can easily be picked up by other non-target conductors in the area. However, it is the preferred method of applying a signal to multiple cables/pipes in the same trench, and for the ‘two-person sweeping’ application.

3M Dynatel transmitters provide a choice of induction frequencies and output power levels. Higher induction output power levels are needed for detecting deeper depths and longer ranges. The 2200M Series 3 Watt transmitters provides two induction frequencies: 33 kHz and 200 kHz. The 12 Watt transmitter provides three induction frequencies: 8 kHz, 33 kHz and 200 kHz. The 200 kHz frequency is commonly used for deeper cables/ pipes and the lower frequencies are used to give longer locate distances. The 8 kHz (low frequency) induction helps in locating shallow facilities, such as risers (12 Watt transmitter only.)

The following sections review Non-sweeping and Sweeping (Area) methods used with the Induction Mode. The Non-Sweeping method is utilized when a specific target requires path tracing. The transmitter remains stationary in-line over the target and the path is traced. The Sweeping method is utilized when a designated area needs to be swept for non-specific targets, for example, all the buried pipes or conductors in the designated area. Several sweeping methods will be reviewed.

A. Non-Sweeping (Passive) Induction Mode Locating

•Position the transmitter over the target facility, with the hinge of the transmitter over and in line with the cable/pipe path. Remove any cables from the Output Jack [T-6].

−− Align the Induction Direction arrows on the transmitter with the target conductor.

•Turn on the transmitter, select the frequency and select high output or maximum output power level for best signal-to-noise ratio.

•Trace the signal path with the receiver using the Induction Peak (Ind Pk) mode.

The Induction Peak (Ind Pk) mode of the receiver is a mode in which the upper antenna of the receiver is tuned to minimize distortion from the magnetic field of the transmitter.

Use Induction Peak (Ind Pk) mode when sweeping distance between the transmitter and receiver is 25–60 feet (7.6–20 m). Beyond 60 feet (20 m) you can also use the Special (single) Peak (Spl Pk) or Directional Peak (Dir Pk) modes. Special (single) Peak (Spl Pk) can be used for maximum detection depth and range (needed for deep conductors

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Contents 3M Dynatel Contents Rev G Rev G Rev G Safety Information Intended UseAbout This Manual Transmitter Battery Installation Quick StartReceiver Battery Installation Cleaning Service and Accessories3M Dynatel Transmitter 2273 Keypad and Connector Definitions Rechargeable Battery Maximum Transmitter Output3M Dynatel Receiver 2250M Key Pad and Display Definitions Dynatel3M Dynatel Receiver 2273M Key Pad and Display Definitions Menu Displays Main MenuRev G Rev G Configuring The Receiver Setting the Receiver ClockSelect Depth Units Selecting a LanguageMenu 6 + More SK4 + Setup SK6 + More SK6d + Tone Freq SK6j Enabling/Disabling FrequenciesCreating User Defined Frequencies Filtering Power Frequency Interference Selecting Locating AudioBuried Cables And Pipes Transmitter Connections Direct Connect MethodRev G Dyna-Coupler Method Non-Sweeping Passive Induction Mode Locating Induction MethodSweeping Active Induction Mode Locating Passive SweepsOne-person Active Induction Mode Sweeps Two-person Active Induction Mode Sweeps Transmitter Set-upLocate/OK 5 + Cable/Pipe SK + Mode SK + Dir Pk SK Toggle Locate/OK 5 + Cable/Pipe SK + Mode SK + DirNull SK ToggleReceiver Modes Directional Peak Dir PkLocate/OK 5 + Cable/Pipe SK + Mode SK + Spl Pk SK Toggle Special Peak Spl PkExpanded Mode Locate/OK 5 + Cable/Pipe SK + Mode SK + Ind Pk SK ToggleDepth and Current Estimate Induction Peak Ind PkLocating Frequencies Active FrequenciesPower Frequencies Passive FrequenciesAuxiliary Frequencies Locating in Directional Peak Mode Rev G Locating Active Duct Probes Sondes Determining ADP DepthLocating Buried Sheath Faults and Earth Return Faults Transmitter SetupPinpointing the Buried Fault Green Band Alert Mode Locating 3M Electronic Markers 3M iD MarkersEnabling/Disabling Marker Types Single Marker Locate Press Locate/OKDual Marker Locate 3M iD Marker DepthPassive 3M Electronic Marker Non-iD Depth Creating/Editing Templates for 3M iD Markers Creating New TemplatesMenu 6 + Data/Templat SK2 + User Templat SK2c Rev G Editing Templates Menu 6 + Write Mode SK1 Writing 3M iD MarkersPress Start Write SK Press Menu 6 + Write Mode SK1 Modifying Marker Data to be WrittenRev G Reading 3M iD Markers Reviewing Marker Read/Write History Read HistoryMenu 6 + Data/Templat SK2 + Read History SK2a Capturing the GPS Coordinates Capture Mode / Mode GPS OperationWrite History SK Communicating with the GPS DeviceMenu 6 + COM Setup SK3 + GIS Path Mapping with GPSCreating Trace Templates Menu 6 + Com SK3 + GIS SK or PDA SKAerial Faults Toning Additional ApplicationsConnection Diagrams Cable IdentificationHelp Mode Menu 6 + More SK4 + Help SK8Self Test Of Receiver Menu 6 + More SK4 + Self Test SK7Product Description And Optional Accessories Standard ConfigurationsProduct Description Direct Connect Cables Earth Contact FrameOptional 3M Accessories for 3M Dynatel Locators Receiver Specifications SpecificationDetection Depth 3M Non-iD Passive Transmitter Specifications Mode can display a fault resistance up to 10M ΩEnvironmental and Regulatory Specifications Rechargeable Battery InformationRev G Electrical Markets Division Important Notice
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