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The SEMS PDA
distress alarm warns the user when the air supply
cylinder has reached 50% of its full capacity and also functions as an
electronic end of service time indicator for the respirator by sounding
an alarm when the air supply cylinder has been depleted to 25% of its
full capacity. The Control Console digital display shows the approxi-
mate cylinder pressure. Details of the end of service time indicator
operation are also discussed in the Operation and Maintenance in-
structions provided with the respirator.
The SEMS PDR Base Station is a compact battery operated device
that can be tripod mounted or carried by a strap. A digital display
provides information about status of the respirator users who are logged
onto the Base Station. Simple dedicated function buttons control the
transmission and receipt of signals with the respirator users. The Base
Station can be easily interfaced with a computer for programming and
advanced applications.
When a respirator user opens the cylinder valve and begins use of an
AIR-PAK SCBA equipped with the SEMS PDA, the Portable Unit will
automatically begin to operate. If the SEMS PDR Base Station is
present at time of entry, the SEMS PDA must log-in with the Base
Station before entry into the hazardous area. Contact between the
SEMS PDA Portable Unit and the Base Station will continue until the
respirator user terminates use of the SCBA.
Each installation of SEMS equipment operates as a distinct set of
Portable Units and Base Station that transmit and receive on a single
frequency. If another installation of SEMS equipment is used in the
same area, the operation of each group will remain discreet and
separate between Portable Units and Base Stations. The SEMS
equipment operates between 453.0375 and 465.6375 MHz on radio
channels defined in FCC Title 47 (Telecommunications) Part 90 sec-
tion 20, Limitation (27) and requirement Part 90.238. Programming
of the Portable Units and Base Station is essential and must be
performed prior to training and use. See SEMS Programming Guide,
SCOTT P/N 89506-01 for complete details of programming the SEMS
equipment.
The installation of the SCOTT SEMS PDA distress alarm is approved
by the National Institute of Occupational Safety and Health (NIOSH)
on all models of SCOTT AIR-PAK 2.2 / 3.0 / 4.5 /
Fifty
SCBA.
The SCOTT SEMS PDA distress alarm Portable Unit, when added to
a SCOTT Air-Pak respirator, as shown in FIGURE XX, consists of a
Sensor Module with battery compartment mounted to the bottom of
the respirator backframe, a pressure gauge with transducer, and a
Control Console mounted on the wearer’s right shoulder strap at the
pressure gauge location. The SEMS PDA Portable Unit requires three
(3) nine volt batteries to operate: two in the Sensor Module on the
backframe and one in the Control Console.
Installation of the SCOTT SEMS PDA distress alarm requires some
disassembly of the respirator and should only be performed by an
authorized service center. Contact SCOTT HEALTH AND SAFETY,
Monroe, NC at 1-800-247-7257 for details.
WARNING
NO PERSONAL ALERT SAFETY SYSTEM, RES-
PIRATOR OR COMBINATION OF PERSONAL
ALERT SAFETY SYSTEM AND RESPIRATOR,
BY THEMSELVES, CAN PROVIDE COMPLETE
PROTECTION IN FIRE SITUATIONS. HOWEVER,
USING AN ALARM AND A RESPIRATOR IN
ACCORDANCE WITH THE REQUIREMENTS
OF AN ORGANIZED RESPIRATORY PROTEC-
TION PROGRAM IS ONE OF THE MANY
SAFETY PRECAUTIONS WHICH SHOULD BE
TAKEN TO AVOID PERSONAL INJURY OR
DEATH.