Min, Max, Stel, Twa; Alarm; Auto Power Off - Extech Instruments CO250 User Manual

MIN,MAX,STEL,TWA

ALARM

AUTO POWER OFF

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In the normal mode, press the Max/AV button to see the minimum, maximum, and weighted
average readings. With each press of the Max/AV button, the meter displays MIN, MAX, STEL,
TWA in sequence and then returns to the normal mode.
In MIN and MAX modes, the meter shows the minimum and maximum readings of CO
display), AIR, DP or WB temperatures (lower left display) and Humidity (lower right display).
In STEL and TWA modes, the main display shows the weighted average of CO
past 15 minutes (STEL) or 8 hours (TWA). The lower displays are the current measurements
NOTE:
1. If the meter has been powered on for less than 15 minutes, the STEL value will be the
weighted average of readings taken since power on. As well, the TWA mode will display a
weighted average of readings prior to 8 hours of operation.
2. The CO250 takes at least 5 minutes to calculate STEL and TWA. The display shows "----"
during the first 5 minutes from power on.
3. The STEL and TWA values will keep updating every 5 minutes.
The meter features an audible alarm to give warnings when CO
limit. It emits beeps (Abt.80dB) when CO
(except ) is pressed or the readings fall below the set value. It beeps again if the value
exceeds the limit. Restart the meter if the beeper will not stop.
The meter turns off automatically after 20 minutes of inactivity. To override the function, press and
hold down the and HOLD buttons until "n" appears in the display (approx. 2 seconds) while
turning on the meter on. NOTE: Auto sleep function will be disabled during calibration mode.
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