EXTECH INSTRUMENTS
7
FM300-en-GB_V1.9 3/17
The illustration at left shows a manually recorded HCHO reading (reading number ‘05’ in this
case); the middle illustration shows the recalled HCHO reading; the illustration at right shows
HCHO readings cleared.
HCHO SELF-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 counts down from 300 seconds. After
calibration is completed, the meter returns to the normal
measurement mode automatically.
NOTE: Power on the meter for 10 minutes at a location with good
ventilation. Ensure that no HCHO concentration is present in the
air while calibrating.
DISPLAY ERROR CODES
ER-1 (Temperature): If the Temperature sensor fails the error
code appears in the Temperature display area.
ER-1 (RH): If the RH sensor fails the error code appears in the RH display area.
ER-2: The measurement exceeds the range of the instrument. This could also indicate that the
meter is malfunctioning. Please contact Extech for service.
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.com
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