5
maximum readings. Press and hold “RESET” for at least 1 sec-
ond to reset the minimum and maximum values.
Alarm
An audible alarm can sound when CO
2
concentration exceeds
user-set limits. It beeps and the fan icon displays on the LCD
when the CO
2
level goes over the upper limit. The sound can be
stopped by pressing any button.
Setup
In normal mode, hold down the SET button for at least 1 second
to enter setup mode. To exit setup, press the ESC button.
P1.0 Set CO
2
Alarm
When entering setup mode, “CO
2
” and “P1.0” are displayed on
the LCD. Press SET again to enter “P1.1” to set upper limit for
the GOOD indicator on the LCD. Press “LOG
S
” to increase or
“MIN/MAX
T
” to decrease the value.
Press SET again to enter “P1.2” to set the CO
2
alarm lower limit
(when the level drops below this, the alarm will automatically
stop). The current value will be blinking on the LCD. Press
“LOG
S
” to increase or “MIN/MAX
T
” to decrease the value.
Press SET again to enter “P1.3” to set the CO
2
alarm upper limit
(exceeding this triggers the alarm). The current value will be
blinking on the LCD. Press “LOG
S
” to increase or “MIN/MAX
T
” to decrease the value (in a plant growth environment, this
should probably be set as high as possible (5000) to effectively
disable the alarm). Press SET to save the values, or ESC to exit
without saving.
P2.0 Set Temperature Units
From the P1.0 display, press “LOG
S
” to change to the P2.0
screen. Press SET to enter “P2.1” to set the temperature units.
The current units, “°C” or “°F”, will be displayed on the lower mid-
dle area of the LCD. Press “LOG
S
” or “MIN/MAX
T
” to switch
between “°C” and “°F”. Press the SET button to save the setting,
or ESC to exit without saving.
P3.0 Real Time Clock
From the P1.0 display, press “LOG
S
” twice to change to the
