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E. Additional Features:
Alarm Level Adjustment
The alarm level can be adjusted by performing the following steps:
1. After the 721 has been turned on and has gone through the
warm up period, press and hold the key for approximately
3 seconds to enter menu mode. The following will be displayed:
2. Press the key to proceed to the display mode screen.
3. Press the key to proceed to the alarm adjustment screen.
The following will be displayed.
4. Press the key to increase the alarm level or the key
to decrease the alarm level. The alarm can be adjusted from
100ppm to 5000ppm in increments of 100ppm. Press the
key when finished.
Additional Features (continued):
Auto Power Off
The auto power off feature can be enabled or disabled as required:
1. After the 721 has been turned on and has gone through the
warm up period, press and hold the key for approximately
3 seconds to enter menu mode. The following will be displayed:
2. Press the key to enable (ys) or disable (no) the auto power
off feature.
3. Press the key to proceed to the display mode screen.
4. Press the key to proceed to the alarm adjustment screen.
5. Press the key to return to normal operation.
Display Backlight
The backlight can be activated at any time as required:
After the 721 has been turned on and has gone through the warm up
period, press and hold the key for approximately 3 seconds to
activate the backlight. The backlight will remain on for approximately
20 seconds.
721 manual_082208.qxd 11/11/2008 7:09 AM Page 12
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