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EMS Markers

Mark buried services for a clearer return visit.

Once the trench is closed, finding a buried valve, cable joint or plastic pipe takes more than a good memory. 3M™ Electronic Marker System (EMS) markers leave a detectable reference for the next crew, helping them return to the right point or follow the marked route.

A compatible locator sends a signal to the buried marker and detects its response. The markers need no batteries or external power supply.

  • Battery-free markers. Ready for the return visit.
  • Self-levelling antenna for a consistent locating position.
  • Utility-specific frequencies for easy identification.

How to choose the right EMS Marker for the job

  • Choose what the next crew needs to find

    A valve needs a point reference. A pipe run needs a path. Match the marker format to the work below ground.

  • Choose the information to leave behind

    Passive markers help locate the point. Programmable iD markers also carry asset details for the crew returning to it.

  • Choose by depth and locator

    Check the distance from marker to locator, then the locator’s capabilities. A detection range and a data-reading range are different specifications.

Choose what the next crew needs to find

For valves, joints, bends and access points, choose an individual point marker. Ball markers have a self-levelling antenna that helps maintain the right orientation after placement. Near-surface markers suit shallow points; full-range markers suit deeper applications. Check the selected model’s depth limit before ordering.

For a pipe or conduit route, choose path marking tape for open trenches or high-tensile rope for horizontal directional drilling. XR tape comes in 400 m rolls; HTS rope comes in 300 m rolls. Calculate quantities against the planned route and installation allowances.

The embedded markers work independently. If a section is cut or removed, the remaining markers can still be located with compatible EMS equipment. There’s no external transmitter to connect or test point to find. The tape and rope have an approximate 50-year design life, giving future crews a buried reference to return to.

Choose the information to leave behind

Choose passive marker balls when the job calls for a detectable point. Choose programmable iD balls when crews also need details such as the asset owner, pipe or conduit size and installation date. An iD-capable locator reads the stored information in the field; programme and verify it before burial.

Tapex’s ball range covers telephone, power, water, wastewater, gas and recycled water. Tape and rope cover communications, power, water, sewer and gas.

Match the utility variant and frequency to the project specification. Confirm that the locator supports the chosen point marker, iD read/write function or tape/rope mode. The right colour is only part of the order.

Choose by depth and locator

A shallow connection and a deep joint need different marker choices. Check where the marker will sit, how much cover will remain above it and whether future crews need to detect it or read stored data.

These water variants illustrate the model differences:

Product Model Published selection range
Near-surface iD marker 1434-XR/iD Up to 0.6 m for data reading
iD ball marker 1423-XR/iD Up to 1.5 m for data reading
Full-range iD marker 1252-XR/iD Up to 2.4 m for data reading
XR path marking tape 7613XR Up to 1.2 m for detection
HTS path marking rope 7703-HTS Up to 1.2 m for detection

Confirm the exact marker and locator combination before approval. Detection range, data reading range and programming range are separate limits. A tape laid above a pipe also sits at a different depth from the pipe itself. Check the point marker ranges and tape and rope specifications for the ordered models.