User Manual

Confidential
Patent #’s 7,420,471
5,939,986 and 6,810,353
Patent Pending
Page 4 of 7
Strata Proximity Systems Surface Display with Silen Zone Users Manual v1.0
Confidential and Proprietary
October 19, 2011
warrant a “Danger” condition. The Surface Display also has a LED to indicate if there is a bus
communication failure with the Central Controller. The Surface Display also has 4 LEDS
which in the case or a Warning or Danger condition, indicate which Surface Proximity
Modules (another component of the HazardAvert System) are detecting the Warning or
Danger condition.
There is also a sounder on the Surface Display with Silent Zone Transmitter which creates
audible alerts to the operator of a Warning or Danger condition.
The Surface Display with Silent Zone Transmitter also contains a Bluetooth Transceiver
which is FCC approved as an integratable module for transferring logged data from the
HazardAvert system to an external Personal Computer for analysis.
1.2 Frequency of Operation
The Silent Zone Transmitter will transmit on a frequency of 73 kHz.
1.3 Label Information
The Surface Display label is located on the face of the unit. A picture of the Strata label is below:
The Strata label defines the model and serial number of the Surface Proximity Module also
MSHA and Commonwealth of Pennsylvania information.
1.3.1.1 MSHA Blasting Distance
MSHA has published Program Policy Letter P11-V-07 concening Two Way Communications and
Blasting Circuits.
SPS magnetic field generators produce a magnetic field that at 100 kHz or .1000 MHz does not
achieve the Critical H Field until 1.42 m with a blasting cap having a pickup area of 10 sq.
meters.