Mid-Range Markers
3
3M
™
Electronic Marking System (EMS)
Mid-Range Marker
Installation Instructions
1.0 Introduction
1.1 3M
™
Mid-Range Markers provide an accurate,
convenient, long lasting method of marking
underground facilities during construction or
maintenance. They also make the job of precisely
locating underground facilities easier. Electronic
marking saves time and money spent searching for
buried facilities prior to excavation. 3M Electronic
Markers enable you to return to the exact location
of the marked underground feature. Unlike surface
markers such as stakes, flags or paint, the mid-
range marker cannot be inadvertently moved or
worn away by weather.
2.0 Installing the Marker
2.1 Place a minimum of 4 inches (10 cm) of fill dirt
over the facility to be marked.
2.2 Position the marker flat and horizontal. Failing to
do so can cause inaccuracies in marker location and
depth estimation.
IMPORTANT: The Mid-Range Marker cannot reliably
re-radiate the locator's signal at a depth greater than
6 feet (1.8 m). This is the maximum allowable distance
between the Mid-Range Marker and the locator tip.
2.3 Hand fill at least 6 inches (15 cm) of soil over the
marker to prevent movement or damage during
backfill, and tamp down the soil.
2.4 Backfill the hole.
3.0 Specifications
Specifications
Read Depth (max)
(US & E-version Locators) 6 ft (1.8 m)
Vertical Separation from Facility (min) 4 in* (10.4 cm)
Horizontal Separation from Facilty (min) 4 in* (10.4 cm)
Distance Between Markers (min) 3.5 ft (1.06 m)
Marker Diameter 8.4 in (21.3 cm)
Marker Height 1.2 in (3 cm)
* Target size and material dependent. Depth estimation may be adversely
affected when placing the marker above a large metallic object, such
as a manhole cover. To improve depth estimation accuracy, increase the
vertical separation from the metal object or perform a field test for depth
accuracy.
Track and Trace Solutions
6801 River Place Blvd.
Austin, TX 78726-9000
1-800-426-8688
www.3M.com/dynatel
Please Recycle. Printed in USA.
© 3M 2010. All Rights Reserved.
80-6104-1198-7-C
Minimum 4" (10 cm) horizontal separation
3M is a trademark of 3M Company.
4" (10 cm)
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