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USE OF THE SEMS PDA PORTABLE UNIT
Users of SCOTT respirators equipped with the SEMS PDA Portable
Unit must be fully trained in the operation of the equipment as part of
a complete respiratory protection program before entering a hazard-
ous environment.
1. Start-up
a) Use of the SEMS PDA Portable Unit begins when the user
opens the cylinder valve on the respirator to start respirator
usage. The unit will sound three chirps to indicate activation.
b) After a brief start-up sequence of less than ten seconds, the
green light in the Control Console and the display will show
“<<<<“ until the unit is acknowledged and logged onto a base
station. An alert tone, a “BE-doop” to indicate the system ac-
tivity, is used for several functions. Whenever the alert tone
occurs, the user should look at the Portable Unit display for
information.
2. Initialization and Range
a) After the start-up sequence, the SEMS PDA Portable Unit will
send an Initialization signal to the Base Station to log in. The
Base Station will respond by showing “ACK” for the identity
assigned to that Portable Unit.
b) If the respirator user moves too far from the Base Station after
logging-in, the Control Console will begin to display “RNGE”
indicating out of range until the user moves back into the Base
Station field of operation (up to one-half mile line-of-sight).
c) If the Portable Unit is too far away from the Base Station at
start-up, or if the Base Station is not powered up, the Control
Console display will read “RNGE” right from start-up and not
be logged into the Base Station. The SEMS PDA Portable Unit
will continue trying to log-in to a Base Station until one comes
into range or is powered up.
d) Except for those functions which involve communication with
the Base Station, all other functions of the Control Console
and SEMS PDA distress alarm are still operational when the
Portable Unit is either out of range or not logged into a Base
Station.
3. Air Supply Cylinder Pressure
a) To check the air supply cylinder pressure, the user must press
and hold the RESET button on the Control Console. The ap-
proximate pressure remaining in the cylinder will be shown in
the display as PSIG.
b) When the cylinder reaches one-half of full pressure, the Con-
trol Console will display “1/2 AIR” for ten seconds.
c) When the cylinder reaches one-quarter of full pressure, the
Control Console will display “LOW AIR”. A low air signal will be
sent to the Base Station within ten seconds. The Base Station
operator must press “ACK” on the Base Station to acknowl-
edge the user’s low air signal.
WARNING
USERS OF RESPIRATORS EQUIPPED WITH
THE SEMS PDA DISTRESS ALARM MUST BE
AWARE OF THE PROPER OPERATION OF
THE DISTRESS ALARM. FAILURE TO RECOG-
NIZE A MALFUNCTION OF THE SEMS PDA DIS-
TRESS ALARM AND TAKE PROPER COR-
RECTIVE ACTION MAY RESULT IN SERIOUS IN-
JURY OR DEATH.