Extech Instruments CO230 User Manual page 7

SETUP MODE (for Alarm limits and Temperature units)
In normal mode, press and hold SET to enter the setup mode. To exit
the setup mode, press CAL/ESC when P1.0, P3.0, or P4.0 is displayed
P1.0 CO2 ALARM Upper and lower limit
When setup mode is accessed, P1.0 and "AL" are displayed.
Press SET to scroll to P1.1 to set the CO
CO set value will be blinking.
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Use the arrow ▲▼ buttons to adjust the value. Each button-press
adjusts by 100 ppm (100~9900ppm). When the desired value is set,
press SET to enter P1.2 to set the lower limit (using the same
method as for the high limit). When finished, press SET to save or
CAL/ESC to exit without saving and return to P1.0.
P3.0 TEMPERATURE UNITS (C/F)
Use the ▲/DP WB button from the P1.0 display to access P3.0.
Press SET to enter P3.1 for setting the temperature units. The
currently selected unit (°C / °F) will be blinking in the lower display.
To switch units press▲/DP WB or MXN/AVG/▼. Press SET to save
the setting or press CAL/ESC to exit without saving and return to
P3.0.
upper limit. The current
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