EXTECH INSTRUMENTS
5
FM300-en-GB_V1.9 3/17
MAX, MIN, TWA, and STEL READINGS
1.
Press MODE to view the maximum reading since meter was powered (MAX icon appears)
2.
Press MODE again to view the minimum reading (MIN icon appears)
3.
Press MODE again to view the TWA (8-hour time weighted average) value
4.
Press MODE again to view the STEL (15-minute short term exposure limit) value
5.
Press MODE again to return to the normal measurement mode
6.
To clear these readings: Enter the Maximum mode and, when the MAX Icon appears, press
and hold the SET button for 3 seconds, “Clr” appears for confirmation.
HCHO ALARM SETTING
1.
Alarm default is ON.
2.
Press and hold the SET button for 3 seconds to enter the setup mode
3.
Press SET again to skip the Date setting (set the Date if desired per earlier instructions)
4.
Press SET again to skip the Time setting (Set the Time if desired per earlier instructions)
5.
Press SET again and a flashing “8” will display. Use the up
▲
and down
▼
arrows to
increase/decrease the alarm threshold. Press SEL/RECALL to move to the next digit. There
are 3 digit places with a maximum setting of 5.00pm (0.08ppm is the default).
6.
Press and hold SET for 3 seconds to save and return to the normal measurement mode.
While alarm is tripped, the LED will flash red even if “beeper audio off” is selected. To silence the
beeper when in an alarm condition, press SET and MODE at the same time. The red LED will
continue to flash, however, until the environmental HCHO level no longer exceeds the default
0.08ppm Alarm level or the user selected Alarm level. Remember to reactivate the beeper for
future use.
INTERPRETING THE FACE ICONS
The three face icons represent three HCHO measurement ranges:
Normal (<0.08ppm), Moderate (>0.08ppm, <0.80ppm), and
Unhealthy (>0.8ppm). The guide and table below are useful when
interpreting measurements for a variety of applications.
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