User Manual

Confidential
Patent #’s 7,420,471
5,939,986 and 6,810,353
Patent Pending
Page 3 of 6
Strata Proximity Systems Surface Silent Zone Assembly Users Manual v1.0
Confidential and Proprietary
December 19,
2011
1 Overview
The Surface Silent Zone Assembly is part of a complete HazardAvert™ Proximity Warning
System from Strata Proximity Systems which provides warnings to both individuals and to
machinery to alert them that the individual has entered too close to an operating piece of
equipment and is in a dangerous situation or that vehicles or machinery are getting close
enough that a collision possibility exists. The Surface Silent Zone Assembly is mounted on a
vehicle or piece of machinery and is connected by an interface cable to a Surface Proximity
Module. The Surface Silent Zone Generator is mounted on the vehicle or machinery in an area
near where the operator would normally be while operating the vehicle or machinery.
1.1 Theory of Operation
The function of the Surface Silent Zone Assembly is:
• To transmit a 73 kHz “Silent Zone” field around a small portion of the vehicle or piece of
machinery in which the operator is allowed to work or enter as part of his normal activities.
The Surface Silent Zone Assembly is connected to a HazardAvert™ Surface Proximity Module,
which under the control of a microcontroller, generates a 73 kHz signal for creating a Silent
Zone around the area of a machine where the operator is located. This 73 kHz signal is
connected to the Surface Silent Zone Module via a wire bundle. Inside the Surface Silent Zone
Assembly is a wire/ferrite radiator element to which the 73 kHz signal is connected. The 73 kHz
signal passing through this wire/ferrite radiator element generates a 73 kHz “Silent Zone”
electromagnetic field which encompasses only the small area of the vehicle or machine in
which the operator can be during operation. The operator is required to wear a Personal Alarm
Device (PAD) which is another component of the HazardAvert™ system which detects and
responds to the presence of 73 kHz fields. As long as the operator is within this “Silent Zone” his
PAD will know he is within an area and not alarm. If the operator exits this Silent Zone safe
area, his PAD will function to alert him and other machines or vehicles equipped with the
HazardAvert™ system of his proximity to dangerous conditions due to his distance from
machine or vehicle hazards.
1.2 Frequency of Operation
The Silent Zone Assembly will transmit on a frequency of 73 kHz.