Wohler CD 210 Mode D'emploi page 28

5.5. Backlight
Hold down MODE for more than one second to activate and cancel back-
light function.
5.6. Min, Max, STEL, TWA
Under normal mode, press M/AV to see the minimum, maximum and
weighted average readings. At each press of M/AV the display shows MIN,
MAX, STEL, TWA in sequence and returns to normal mode.
In MIN and MAX modes, it shows the minimum and maximum readings of
the CO -level on the main display and of the air temperature, dew point or
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wet bulb temperature and the relative humidity on the lower displays.
In the STEL and TWA modes, the main display shows the weighted aver-
age of CO readings for the past 15 minutes (STEL) and 8 hours (TWA).
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The lower displays are the current air temperature, dew point, wet bulb
temperatures and humidity.
Note:
1. If the meter is turned on for shorter than 15 minutes, the STEL value
will be the weighted average of readings taken since the meter has
been powered on.
2. It takes at least five minutes to calculate STEL and TWA. The display
shows "----" during the first five minutes from power on.
3. While all readings are held unchanged, STEL and TWA will keep up-
dating every five minutes.
Fig. 5.3: Display during the first five minutes
5.7. Alarm
The meter features audible alarm to give warnings when the CO
tration exceeds the limit (see chapter 7.1). It emits beeps when the CO
level goes over the set value and stops when any key (but the ON/OFF
key) is pressed or readings fall below the set value. It beeps again when
the value goes over the limit. Restart the meter if the beeper cannot be
stopped.
Hotline: +49 2953 73-211
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Fax: +49 2953 73-250
Wöhler CD 210
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