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.