Spe ifi ations
Size:
Weight:
Sensor: 2 year life Electrochemical
Range: 0 to ppm ( parts per million )
Accuracy: ± 3 ppm or 5% whichever is the
greater.
Response Time: 0% of reading within 60 seconds.
Temperature:
Batteries: 2 x 1.5v size AA Alkaline .
Operating Time:
On/Off Press the green power switch in order to
turn the instrument on. All segments will
be displayed for approximately 2 seconds.
The screen will then display CO in ppm and
the reading will rapidly count down to zero
as the instrument stabilizes. The green
power on indicator will be illuminated. To
switch off, press the green power switch
twice in quick succession.
Note: Always swit h the instrument on in
outside ambient air.
Mode Pressing the Mode key scrolls through the
functions: Record Maximum Reading,
Elapsed Time, Alarm Setting, Audible Alarm,
CO display.
Re ord Maximum Readings - displays the
maximum CO reading in ppm since power
on.
Elapsed Time - displays, in hours and min-
utes, the time elapsed since power on.
Maximum reading is hours 5 minutes (
:5 )
Alarm Setting - displays the value that the
personal audible and visual alarm is set at.
Alarm is factory set at 30ppm CO. Audible
Alarm - In this mode the
Audible Alarm can be switched on and off
by pressing the SEL button.
SEL Manual Zero - The instrument performs an
auto zero at power on. If the instrument
does not zero, a manual zero may be per-
formed. With the CO display screen selected
press and hold the SEL key for 2 seconds
until a short beep is heard. The screen will
display some changing symbols and after 5
seconds the instrument will zero and other
beep will be heard.
Changing Alarm Setting - The 770 is set at
the factory to 30ppm alarm level. With the
instrument switched off press the On/Off key
