User's Manual

Page 34 of 40
P/N 595166-01 Rev A 1/09
DRAFT COPY
WARNING
KEEP THE ANTENNAS OF HAND-HELD RA-
DIOS AT LEAST SIX (6) INCHES AWAY FROM
THE CONTROL CONSOLE AND THE SENSOR
MODULE OF THE SEMS II DISTRESS ALARM
WHEN TRANSMITTING. CLOSE PROXIMITY OF
RADIO EQUIPMENT TO THE SEMS II DISTRESS
ALARM DURING RADIO TRANSMISSION MAY
CAUSE THE UNIT TO MALFUNCTION. FAILURE
TO RECOGNIZE A MALFUNCTION OF THE SEMS
II DISTRESS ALARM AND TAKE THE PROPER
CORRECTIVE ACTION MAY RESULT A NON-
WORKING DISTRESS ALARM WHICH WILL NOT
SOUND IF THE USER STOPS MOVING AND LEAD
TO SERIOUS INJURY OR DEATH.
WARNING
BE AWARE OF THE POTENTIAL EFFECT OF RA-
DIO TRANSMISSIONS FROM BASE STATION OR
TRUCK MOUNT RADIOS WHEN USING A RES-
PIRATOR WITH THE SEMS II DISTRESS ALARM.
CLOSE PROXIMITY OF RADIO EQUIPMENT
TO THE SEMS II DISTRESS ALARM DURING
RADIO TRANSMISSION MAY CAUSE THE UNIT
TO MALFUNCTION. FAILURE TO RECOGNIZE
A MALFUNCTION OF THE SEMS II DISTRESS
ALARM AND TAKE THE PROPER CORRECTIVE
ACTION MAY RESULT A NONWORKING DIS-
TRESS ALARM WHICH WILL NOT SOUND IF THE
USER STOPS MOVING AND LEAD TO SERIOUS
INJURY OR DEATH.
DETECTING AND AVOIDING
RADIO FREQUENCY INTERFERENCE
When any electronic device is adversely affected by radio waves, Radio
Frequency Interference (RFI) is said to have occurred. All electronic devices
like the SEMS II distress alarm may be subject to the effects of RFI. Radio
transmissions from the antennas of radios including those used by re ght-
ers, police and other public safety related personnel may produce RFI in the
SEMS II distress alarm. RFI may occur while the radio is transmitting if the
respirator equipped with the SEMS II distress alarm is in close proximity to
a base station or high-powered vehicle mounted radio, or if the antenna of
a personal portable hand held radio is touching or within six (6) inches of
the Control Console or Sensor Module of the SEMS II distress alarm. See
FIGURE 5.
Be aware of the symptoms of RFI. A SEMS II distress alarm affected by RFI
may temporarily give false indications such as the sudden sounding of the
loud continuous three-tone chirp of the full alarm. In some instances the
lights on the control console may ash without sounding the alarm. In rare
circumstances, an alarm which was sounding may stop.
If the PAK-ALERT exhibits any of the symptoms of RFI, identify the source
of the RFI and do the following:
– If the symptoms of RFI occur when standing near a base station trans-
mitting antenna or a truck mounted radio antenna, move away from the
antenna until the symptoms stop.
– If the symptoms of RFI occur while transmitting on a hand-held radio,
move the radio away from the PAK-ALERT .
CHECK THE CONTROL CONSOLE AND BE CERTAIN THE GREEN LIGHT
IS FLASHING NORMALLY WHEN THE INTERFERENCE STOPS, REGARD-
LESS OF THE SOURCE.
In normal usage with the air cylinder open, the SEMS II distress alarm will
typically resume normal operation after experiencing RFI.