User manual

EXTECHINSTRUMENTS
7CO50‐en‐GB_V1.212/14
MANUALLYSTORE/RECALL99COREADINGS
The CO50 can manually store a CO reading with a press of the SEL/RECALL button. The LCD
shows the current record number (01‐99) in the humidity reading area each time a reading is
manuallystored(ashortbeepwillsoundeachtimeareadingisstoredalso).
Torecallstored
readings,press andholdtheSEL/RECALLButton,theLCDshowsthenumberof
therecordwithitsCOreading,toscrollotherstoredreadingsusethe▲and▼buttons.
Toclearstoreddata:
AccesstheRecallmode andpressand holdtheSETbutton until “Clr“appearson LCD.
TheLCD
automaticallyreturnstonormalmode.
Theillustrationbelowontheleftshowsa manuallyrecordedreading(readingnumber‘05’inthis
case); the middle illustration shows the recalled reading; the illustration on the right shows
readingscleared.
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COCALIBRATION
Itisrecommendedthatthemeterbecalibratedmonthlyinacleanair
environment.
From the normal measurement mode, press and hold the MODE▼
buttonforatleast6secondstoentercalibrationmode.
TheLCDshowsCALandanumberrepresentingthetimeremainingin
the calibration (15 seconds).
The meter returns to the normal
measurementmodeautomaticallywhencalibrationiscomplete.
Warning:EnsurethatnoCOconcentrationispresentwhilecalibrating.
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Readingstored ReadingRecalled ReadingCleared