20
PALS Installation Manual
CRISIS CONTROLLER©™ HARDWARE (continued)
IRT range can be reduced by proximity to fluorescent lighting. Generally speaking, loss
is minimal if the IRTs are farther than 2 meters from the light source and the light
source is not generating in-band noise. In-band noise is typically generated by
an electronic ballast. IRTs must be mounted per the diagrams shown. Incorrectly
mounting the IRTs may significantly reduce the range or inhibit the operation of the
unit. The following are four examples of incorrectly mounted IRTs.
Another method of determining location of PMTs is through Wireless RF Locators. These devices are 900MHz
transceivers that attach data to transmitter messages indicating which Locator device was the first to pick up a signal
directly from the transmitter. Wireless RF Locators are typically used to provide approximate origination signals
from PMTs. Wireless RF Locators provide relatively coarse indications of location, partly due to their extensive
range. They are particularly well suited for outdoor zoning with the PALS©® transmitters.
Wireless RF Locators can be used very effectively in conjunction with IRT Locators. For example, IRT Locators can be
used to closely monitor movement inside a building. They can be programmed to indicate when personnel enter or
leave an IRT-supervised area. If personnel need to move between buildings, for example, RF Locators can provide
larger area coverage while they are in transit. When they enter another building, IRT sensors will note their arrival.
Wireless RF Locators (RFL)
