3M Electronic Marking System EMS Marker Locator with iD ReadWrite 7420 User Manual

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7. Reading 3M™ iD Markers
The operator can retrieve the data from the 3M™ iD Marker by pressing Read [SK] on 
the Marker Locate screen.
The locator tip should be lowered to the ground to reach maximum read depth.
If more than one iD marker of the same utility is detected, the locator will read the first 
marker and display the data from the marker.
The fourth yellow command key will be labeled 
“Read Next”. Press this key to extract the data from 
the other marker.
All the information...

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B. Write History
Menu [6] + Data Templat [SK:2] + Write History [SK:2b]
• Select the marker data to be viewed by pressing 
the up/down arrows [SK].
•  Press  Write Details [SK] to view all data that was 
sent to the marker.
•  Press  Write History [SK] to return to the list of 
written data.
•  Press  Exit [SK] to return to Data/Template review 
display.
For additional information concerning writing to 3M™ iD Markers, refer to 
www.3M.com/dynatel  - Instruction Manual M-Series...

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C. Inputting the GPS Activation Key
Menu [6] + COM Setup [SK:3]
Initially, when the COM  [SK:3] key is pressed, and an attempt is made to enable any 
selection other than PC, the screen below will appear and you will be prompted to 
input the activation key that you have obtained from the website. This will have to be 
performed only one time to enable the GPS interface.
•  Move the selector box left or right by pressing the 
arrow keys [SK].
•  Press  Select  [SK] to enter each...

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The information from the iD marker, as well as the GPS coordinates, will display on the 
locator display. This information is saved automatically in the Read Marker History. (See 
8.A. Reviewing Marker Read/Write History.)
If the marker is a passive marker (rather than iD) the locator will display “No iD Marker 
Found”. The GPS coordinates of the attempt to read the non-iD marker are stored in 
the Read Marker History as serial number # 0000-0000-0000. The marker details will...

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11. 3M™ Dynatel™ PC Tool Kit and 
Locator Software Upgrades
Locator software upgrades are periodically released and can be downloaded, free of 
charge, at www.3M.com/dynatel . Located under the Software section, the software is 
titled  2550/2573/2250M/2273M/7420 Locator PC Tools xx.x.x (EXE xx.xMB). Once 
downloaded to your PC, double click the file and an auto-installer will install the 
PC  Tool desktop software. Double click the Dynatel PC Tool Kit icon on the desktop. 
Using the...

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13. Replacement Accessories
Item Part Number
AC Charger for 7000RB  Rechargeable   
Battery Pack 7000CH
Rechargeable Battery Pack for   
7000 Series Rcvr  7000RB
14. 
3M™ Dynatel™ EMS Marker/Tape Locator 
7420/7420E Product Specifications
Physical Specifications:
Locator
Shipping Box Size (H x W x D) IN (CM) 
30" x 6.5" x 10.5" (76 x 17 x 27)
Size (L x W x H) IN (CM)
33" x 17" x 12.5" (84 x 43 x 32) Weight (including 
batteries)
5 lb. (2.25 kg)
7 lb. (3.2 kg)...

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7420E Maximum Read Range 
3M™ iD Markers (with ID):(Telephone, Power, Gas, Waste-
water, Communications (CATV), 
General Purpose) Water*
Near-Surface
Ball Marker
Full-Range 90 cm (36 in)
1.5 m (60 in)
2.4 m ( 96 in) 60 cm (24 in)
1.0 m (40 in)
2.0 m (78 in)
* Some countries do not allow all marker operating frequencies. Refer to Configuration Section 
for 7420E (Section 4A).
Maximum Detection Depth
Passive Markers (no ID):
Near-Surface
Ball Marker
Mid-Range
Full-Range 3 ft (0.9 m)
6...

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Important Notice
All statements, technical information and recommendations related to 3M Products are based on information 
believed to be reliable, but the accuracy or completeness is not guaranteed. Before using the 3M Product, 
you must evaluate it and determine if it is suitable for your intended application. Because conditions 
of Product use are outside of our control and vary widely you assume all risks and liability associated 
with such use. Any...