11
4.4 Using the Menus and Key Functions
To enter the setup menu press
The following menus will
appear: -
Normal Menu
Special Perc Menu
Press
or
to scroll to the desired menu.
4.5 Zero Calibration
The “ZERO CAL” routine resets the zero point of the monitor.
"ZERO CAL" must be carried out under carefully controlled
conditions, as specified below.
Minimum 24 hours warm up
Clean air (charcoal filtered is best), no cross-sensitive gases
Stable and low air flow around the monitor
No vibration or movement of the monitor
Temperature at 20
°
C ± 2
°
C (68
°
F ± 3.5
°
F)
Relative Humidity of 50% ± 5%
An incorrect "ZERO CAL" does not cause permanent damage.
The process should be repeated under the above conditions.
NOTE: Carbon Dioxide sensors MUST be calibrated in a cer-
tified Zero Air environment. If in doubt contact Aeroqual
Limited.
Press and hold
until the word
GO
appears next to Reset
Routine. The routine will run for up to ten minutes (depending on
the gas sensor installed) and then beep to indicate completion.
Talk to your supplier or distributor if you have questions
.
Press
to scroll down to the next menu choice.
•
See section 13.0 for more information
EXIT
ZERO CAL
CONC UNIT
MIN MAX AV
EXIT
ZERO CAL
CONC UNIT
MIN MAX AV
ALARM MUTE
ALARM
ALARM LEVEL
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