Sensors PG1 | Data sheet No. 14108 | Version 11-2018 |
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CO
2
/ humidity and hand-held temperature measuring device CO
2
-TEMP(-RH)-HMG
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
power on. Same for TWA values appear before 8 hours.
2. It takes at least 5 minutes to calculate STEL and TWA. The
display shows “----” (Fig. 9) during the first 5 minutes from
power on.
3. While all readings are held unchanged, STEL and TWA will
keep updating every 5 minutes.
Alarm
The meter features audible alarm to give warnings when CO
2
concentration exceeds the limit. (See P1.0 in setup for setting
alarm threshold). It emits beeps (about 80 dB) when CO
2
level
goes over the set value and stops when any key (but
) was
pressed or readings fall below the set value. It beeps again
when value goes over the limit. Restart the meter if beeper can‘t
be stopped.
Auto power OFF
The meter turns off automatically after 20 minutes of inactivity.
To override the function, hold down
and
for 2 seconds
to turn on the meter until “
n
” appears.
Note:
Auto sleep function will be disabled during calibration mode.
Setup
Hold down
under normal mode for more than 1 sec to
enter setup mode. To exit setup, press
in P1.0 or P3.0 and it
returns to normal mode.
Note:
P2.0 is not applicable in these models but for future model with
CO and CO
2
measurement.
P1.0 CO
2
alarm
When entering setup mode, P1.0 and “AL” (Fig.10) are displayed
on the LCD. Press
to go into P1.1 for setting CO
2
alarm
threshold. The current set value will be blinking on LCD (Fig. 11).
CO
2
calibration
The meter defaults to be calibrated manually in the ambient air
where CO
2
concentration is around 400 ppm.
Caution:
Do not calibrate the meter in the air with unknown CO
2
concen-
tration. Otherwise, it will be calibrated as 400 ppm by default
and leads to inaccurate measurements.
Calibration site
It is suggested to calibrate the CO
2
sensor in fresh outdoor
air that is well ventilated and better in sunny weather. Do not
calibrate the meter in places crowded with people or close to
where with high CO
2
concentration such as ventilating outlets
or fireplaces.
Procedure
Place the meter in the calibration site. Turn on the meter and
hold down
and
simultaneously to enter CO
2
calibra-
tion mode (Fig. 14). 400 ppm and “CAL” are blinking on the LCD
while performing calibration.
Wait about 10 minutes until the blinking stops and the calibra-
tion is completed automatically and back to normal mode. To
abort the calibration, turn off the meter at any time.
Note:
Ensure the batteries are with full voltage during the calibration
to prevent from interruption or failed calibration.
Press
to increase the value or
to decrease. Each press
tunes 100 ppm and the alarm range is from 100 to 9900 ppm.
When the preferred alarm value is set, press
to save the
setting or
without saving and return to P1.0.
P3.0 temperature scale
Press
or
in P1.0 to access P3.0 for setting up tempera-
ture scale (Fig. 12). Press
and it goes into P3.1 with blinking
oC or ºF current set (Fig. 13) on the lower left display. To switch
ºC or oF, press
and
. Then press
to save the setting
or
without saving and return to P3.0.
