3M W-2806/07006 Instruções para o utilizador - Página 16
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Também para 3M W-2806/07006: Instruções gerais de funcionamento e de peças (2 páginas)
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TROUBLESHOOTING
Low battery
As the battery voltage declines toward the end of its life, the following indications occur:
a) At 7.0 volts, the amber LOW BATTERY light will come on. Battery replacement is
recommended at this point, but continued operation is still possible.
b) At 6.4 volts, the buzzer will beep at intervals of about 7 seconds.
c) At 5.8 volts, the buzzer will beep at 1-second intervals and the display will go to --.
This malfunction indication will continue until the battery is completely dead.
Problem
CO monitor's LED red and
green lights blink on/off
along with the alarm buzzer
and display shows 'SC'
CO monitor display will not
move from zero '00' when
the sensor is exposed to a
known sample of CO
The CO monitor cannot
be calibrated
The span adjustment cannot
be made when the span gas is
applied (i.e. the reading will
not reach the span gas value)
With zero gas flowing
through the monitor after
approximately one-minute
display reads minus one
(-1) to the far left
Potential Cause
The sensor has internal failure
Poor connection between
sensor pins and circuit
board connections
SPAN adjustment may
be set to zero
Span gas cylinder empty
The sensor has lost sensitivity
Circuit malfunction
The span gas and/or zero
gas bottle(s) may be empty
The sensor has lost sensitivity
The span gas bottle may
be empty
The sensor has lost sensitivity
Zero potentiometer may be
turned counterclockwise all
the way
The sensor has lost sensitivity
15
Corrective Action
Turn monitor off and after
a few seconds turn monitor
back on. Try to calibrate the
monitor. If the monitor will
not calibrate, replace the sensor.
Unplug-Plug circuit board
from sensor pins to make
better contact connection.
Try to calibrate monitor.
If monitor will not calibrate
or 'SC' appears again,
replace sensor.
Recalibrate the monitor
Replace the cylinder
Replace the sensor
Repair is needed
Replace the empty span
and/or zero gas bottle(s)
Replace the sensor
Replace the empty span
gas bottle
Replace the sensor
Adjust the zero potentiometer
clockwise until zero
'00' reached
Replace the sensor