3M MidRange Marker Installation Instructions

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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
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80-6104-1198-7-C
Minimum 4 (10 cm) horizontal separation
3M is a trademark of 3M Company.
4" (10 cm)