User's Manual

Page 10 of 10
Issuer: IWT, Inc. Doc. Num.: 6650-11-0040 Rev: A
Revised: Dec 15, 2011
Approval:
7. OPERATING AND MAINTENANCE
INSTRUCTIONS
The Sentinel Beacon does not have any direct user interface.
Monitor the status of the Sentinel Beacon by observing the LED mounted on the outside of the
enclosure (LED1):
BLINK (ON—1 ms, OFF—500 ms): Power ON / Device transmitting
OFF: Power OFF / Device not transmitting
The Sentinel Beacon requires little routine maintenance. Inspect each box periodically every 3-6
months to ensure that the box remains free of defects. It is important that the box remains dust
tight. Replace defective boxes immediately. Do not continue to use any boxes that may have
had their dust seal compromised.
Replace the C cell batteries inside the Sentinel Beacon enclosure once each year. Refer to
Section 2.2 for MSHA requirements pertaining to the batteries. To prevent dust and moisture
from entering the Sentinel Beacon enclosure during battery replacement, replace the batteries in
a location above ground and free from excessive moisture and coal dust.
To replace the Sentinel Beacon’s batteries:
1. Prior to removing the enclosure’s lid, wipe surfaces of enclosure to remove excess
dirt/dust.
2. Remove enclosure lid by unscrewing the four lid screws.
3. Remove the two C cell batteries from the battery holders.
4. Insert two fresh C cell batteries into the battery holders noting proper polarity
.
5. Replace the enclosure lid gasket.
6. Replace enclosure lid and secure all four lid screws.
At this point the beacon will be in a non-operational, battery conserving mode. To initiate
normal operation of the beacon, follow the instructions in Section 6.1.2.