Sper Scientific 800046 Indoor Air Quality Meter - Manual (Page 11)

- 11 -
MEASUREMENT PROCEDURES
When CO
2
concentration exceeds a preset threshold (refer
to Setup), an audible alarm sounds. The audible alarm
stops when any key except SET is pressed, or readings fall
below the threshold. If the audible alarm cannot be disabled
normally, turn the unit off then on again.
The meter automatically turns off after 20 minutes of inac-
tivity. To override Auto Power Off, turn the meter off by
pressing SET, then press and hold SET and HOLD
simultaneously for 2 seconds until “n” appears on the LCD.
Note…
Auto Power Off is disabled when the unit is in the Cal-
ibration mode.
To enter Setup mode, ensure the meter is in Normal mode
and press and hold SET for more than 1 second. To exit
Setup mode, press CAL with either P 1.
0
or P 3.
0
displayed
and the meter will return to Normal mode.
1. When entering Setup mode, P 1.0 and “AL” are dis-
played on the LCD. Press MN/MX/AV to set the CO
2
alarm threshold. The current threshold setting will blink
on the LCD.
Alarm
Auto Power Off
Setup
P 1.0 - CO
2
Alarm