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8. FUNCTIONS AND OPERATION
OPERATION:
The CO monitor is operational once the activation switch is slid to ON
position. If the monitor’s power is active, the
POWER
green LED will flash once every
60 seconds. The LCD readout will continuously display 0 PPM, or the current CO level
if 5 PPM or more is detected.
LOW BATTERY CONDITION:
When battery voltage drops below an acceptable level,
the monitor will chirp once per minute and
POWER
green LED will blink 5 seconds every
minute. The LCD will also display
symbol and 0 PPM, or current CO level if 5 PPM
or more is detected. See Section 13 for information regarding service.
SERVICE CONDITION:
An internal microcontroller continuously monitors the sensor
function and other critical components. If an internal failure of any of these components
should occur, the monitor will chirp twice (
BEEP - BEEP
) per minute,
SERVICE
red LED
will blink for 5 seconds every minute, and LCD will continuously display
. This
malfunction condition indicates a problem with the unit. See Section 13 for information
regarding service.
END-OF-LIFE CONDITION:
The electrochemical sensor has a five year service life.
Once the batteries are activated, a microcontroller monitors the total time that the
monitor is under power. After five years of service, the “End-of-Life” signal will be
activated to indicate that the sensor life has expired and the monitor must be replaced;
the LCD will continuously display
, monitor will chirp once per minute and
SERVICE
red LED will glow for 3 seconds at the same time. See Section 13 for handling an End-
of-Life signal.
ALARM CONDITION:
When the batteries are active, and CO gas is detected at a level
and duration specified in Section 3, the horn will sound and
ALARM
red LED will light.
The alarm signal will sound 4 short beeps every minute for CO levels detected between
15-24 PPM, or every 5 seconds if over 24 PPM. The
ALARM
red LED will flash in sync
with the beeping sound. The LCD will also display the current CO level detected. After
having alarmed for more than 5 minutes, the alarm signal will change to 4 short beeps
every 60 seconds for CO levels detected between 15-149 PPM, or every 20 seconds for
CO levels detected of 150-500 PPM or more. The alarm signal is either manually or
automatically reset. See Section 10
WHAT TO DO WHEN THE ALARM SOUNDS
.
TEST/RESET/MUTE
BUTTON:
The
TEST/RESET/MUTE
button is used to check the
monitor for proper operation, and to temporarily mute horn for 12 hours when alarm is
activated at CO levels between 15-24 PPM, or 5 minutes if over 24 PPM. The mute
feature is disabled if CO levels reach 100 PPM or more. A “Low Battery Voltage” signal
(
)
can be muted for 24 hours during first week of activation. The sensor “End-of-Life”
signal (
) can be muted for 60 hours during first month of activation. The LCD will
display current CO level if 5 PPM or more is detected while monitor is tested, or
for
5 seconds when an alarm signal is muted. See Section 9 for detailed instructions to test
the monitor and mute the audible horn.
LCD DISPLAY FUNCTION:
When monitor is operating normally, the LCD will display
0 PPM or the current CO level if 5 PPM or more is detected. Above 500 PPM, the LCD
will flash “500 PPM”. The LCD will display
symbol if batteries have low voltage.
