Metria 7722 Manual De Usuario página 8

Manual calibration
The manual calibration is suggested to be done in outdoor area with ventilating fresh air where CO
around 400 ppm. Do not calibrate in places crowded with people or closed areas with high CO
such as ventilating outlets or fireplaces.
Place the meter in the calibration site. Turn on the meter and hold CAL/ESC and UP keys simultaneously to enter
CO calibration mode (Fig. 16). 400 ppm and "CAL" are blinking on the LCD while performing calibration.
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Figure 16
Wait about 5 minutes until the blinking stops and the calibration is completed automatically and return to normal
mode. To abort the calibration, press RESET key for more than 1 second.
RH calibration
The meter defaults to be calibrated the humidity with 33% and 75% salt solution. The ambient conditions is
recommended to be at 25 ºC and stable humidity (better to be close to the calibrating value). To stop the
calibration, hold RESET key for more than 1 second at any time.
CAUTION: Do not calibrate humidity without default calibration salt, otherwise, it will cause permanent damage.
33% calibration
Plug the sensor probe into 33% salt bottle. Hold CAL/ESC and DOWN keys under normal mode to enter 33%
calibration (Fig. 17). "CAL" icon and calibrationg value (32.7% if at 25ºC) are blinking on the LCD with current
temperature at the left.
Meter is now calibrating and will finish in about 60 minutes when "CAL" icon and humidity value stop blinking
(Fig. 18).
Figure 17
75% calibration
After 33% calibration, plug the sensor probe into 75% salt bottle, then press SET key to enter 75% calibration
(Fig. 19).
Figure 19
Figure 18
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level is
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concentration
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