User's Manual

Page 7 of 10
Issuer: IWT, Inc. Doc. Num.: 6650-11-0040 Rev: A
Revised: Dec 15, 2011
Approval:
Magnetic Mounting Feet:
The Sentinel Beacon includes holes for three magnetic mounting feet for quick installation. The
mounting feet screw into the base of the enclosure. In areas of the mine where magnets are not
permitted (per MSHA PIB 09-36), cable ties may be used.
5. PRIOR TO INSTALLATION
5.1 Site Survey
Conduct a survey to determine the appropriate sites to install the Sentinel Beacon from an RF
perspective.
5.2 Visually inspect each Sentinel Beacon to ensure that:
 The enclosure is free from damage or defects.
 Four screws properly secure the enclosure lid.
6. INSTALLATION INSTRUCTIONS
6.1 Installations Below Ground
IMPORTANT NOTE:
TRAINED PERSONNEL MUST PROFESSIONALLY INSTALL THE SENTINEL
BEACON. FOLLOW ALL MSHA REQUIREMENTS SPECIFIED IN SECTION 2.2.
At each of the sites determined by the survey described in 5.1:
6.1.1 Antenna Placement
Determine the placement for the 900 MHz antenna to ensure proper RF propagation. For units
installed in coal mines below ground, mount the antennas to roof bolts using the magnetic
antenna mount. Select locations that ensure proper RF communication. Antenna location should
not present a safety hazard or opportunity for damage to occur.
Per the Institute of Makers of Explosives (IME) Safety Library Publication No. 20, the
recommended clearance distance between the Sentinel Beacon’s antenna and any blasting circuit
is a minimum 3.3 feet.