User Manual

Confidentoial
Patent #’s 7,420,471
5,939,986 and 6,810,353
Patent Pending
Page 7 of 9
Strata Proximity Systems Underground PAD Users Manual v1.0
Confidential and Proprietary
September 1,
2011
2.1.1 Interoperability Warning
The Underground PAD may experience erratic responses when in very close proximity to some
electronic devices. Electrical devices may transmit an electrical field and noise from these fields
may cause interference with the PAD’s reception. A safe guideline is to keep PAD at least 75
mm away from any electrical devices included but not limited to methane monitor, radio,
mobile phone, PDA, battery charger and laptop.
2.2 Charging
The Underground PAD is powered from an internal rechargable Lithiun Ion battery that is
connected to the other three boards through a Battery Interface Board. This Interface Board
contains a PIC microcontroller which provides switching functions to control power application
to the other boards as well as to determine when the PAD battery is being recharged. The
Battery Interface Board also contains circuitry necessary to allow the device to meet the
intrinsically safe requirements of mining equipment.
The PAD must be charged daily in an approved PAD charging station. The PAD will take
approximately 8 hours to charge when completely discharged. The PAD will operate for
approximately 48 hours after being fully charged.
2.3 Alerts
The Underground PAD will alert the user with both an audible sound and a visual indicator that
they are in an area that is too close to the vehicle or machinery. Once the PAD has determined
that the user is too close to the machine, it will begin to warn the user. Mulitple levels of
warning are provided. The typical setting is to give a warning when the user enters the
Warning Zone and as the machine aprroaches closer,the PAD crosses into the Danger Zone and
will alarm continuosly. A photograph of a PAD with its LED is shown below.