Operation
CO2: upper limit and lower limit exceeds standard setting
Single press Alarm sound on/off.
Press and hold to SET button to check following values: CO2> CO2> RH% > RH%
Long Press SET button about 2 seconds, CO2/PPM/ shown on, value 400 flashes, press UP or DOWN button to
set CO2lower limit exceed standard value (lower limit Max value cannot bigger than the upper limit Min value.
The Min value is 400, setting unit is 10ppm/set). Long press UP or DOWN button make value run faster.
Long press SET button about 2 seconds, CO2/PPM/ shown on, value 2000 flashes, press UP and DOWN button
to set CO2upper limit exceed standard value (upper limit Min value cannot smaller than the lower limit Max value.
The Max value is 5000, setting unit is 10ppm/set). Long press UP or DOWN button make value run faster.
Humidity : upper limit and lower limit exceeds standard setting
1) Press SET button, humidity and shown on, humidity value flashes, press UP or DOWN button to adjust:
•lower limit humidity range (lower limit Max value cannot bigger thank upper limit Min value, the Min
value can be set to 25%, setting unit is 1%/set. Long press UP or DOWN button make value run faster.
•upper limit humidity range (upper limit Min value cannot smaller than lower limit Max value. The Max
value can be set to 90%, setting unit is 1%/set). Long press UP or DOWN button make value run faster.
2) After setting all values, press SET button to save desired value or keep it not moving for about 10 seconds.
Remarks:
Lower limit of humidity set as 30%, when humidity lower than 29%, only flashes.
Upper limit of humidity set as 80%, when humidity higher than 81%, only flashes.
CO2ALARM ON/ OFF
Default setting is OFF（symbol disappears). Press ALARM ON/ OFF button，activate CO2ALARM function，
symbol appears. When CO2value goes up to desired upper limit value, alert rings and flashes.
Ring every 3 seconds Lower than 200ppm
Ring every 1 second Lower than 500ppm
Ring twice each second Over 800ppm
Press AL ON/OFF button to quit alerts, alert period is 2 minutes.
Press ALARM ON/ OFF button, turn off CO2ALARM function，disappears.
When CO2value goes up to desired lower limit value, only flashes, no alert will sound.
