General Tools and Instruments CDM77535 - Manual (Page 6)

ALARM
The meter features an audible alarm to give warnings when CO
2
concentration exceeds the limit. (See P1.o in setup for setting alarm
threshold). It emits beeps (Abt.80dB) when CO
2
level goes over the set
value and stops when any key (except ) was pressed or
readings fall below the set value. It beeps again when value goes over
the limit. Restart the meter if beeper can't be stopped.
AUTO POWER OFF
The meter turns off automatically after 20 minutes of inactivity. To
override the function, hold down (
) and ( ) for 2 seconds
to turn on the meter until “n” appears.
NOTE: Auto sleep function will be disabled during calibration mode.
SETUP
Hold down (
) under normal mode for more than 1 sec to enter
setup mode. To exit setup, press ( ) in P1.o or P3.o and it returns
to normal mode.
PROGRAMMING P1.o CO
2
ALARM
When entering setup mode, P1.o and “AL” (Fig.10) are displayed on the
LCD. Press (
) to go into P1.1 for setting CO
2
alarm threshold.
The current set value will be blinking on LCD (Fig11).
Press ( ) to increase the value or ( ) to decrease. Each
press tunes 100 ppm and the alarm range is from 100 to 9900ppm.
When the preferred alarm value is set, press (
) to save the
setting or ( ) without saving and return to P1.o.
NOTE: P2.o is not applicable in this model.
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