5
Operating Manual – Carbon Monoxide Measuring Device BG20
EN
Carrying out a measurement
Note:
Note that moving from a cold area to a warm area can lead to
condensation forming on the device's circuit board. This physical
and unavoidable effect can falsify the measurement. In this case,
the display shows either no measured values or they are
incorrect. Wait a few minutes until the device has become
adjusted to the changed conditions before carrying out a
measurement.
1. Direct the device towards the supposed CO source.
– The measured value will be displayed in real time.
– If the measured value amounts to more than 30 ppm, a
repetitive acoustic warning signal will be emitted. The
higher the CO content, the higher the repetition frequency.
The LED (4) is illuminated in red.
– If the measured value amounts to more than 200 ppm, a
constant acoustic warning signal will be emitted. The
LED (4) is illuminated in red.
Maximum value display
The device can display the maximum value determined since the
beginning of the measurement. To do so, proceed as follows:
1. Press the MODE button (6) once.
– The indications MAX (9) and REC (11) appear on the
display.
– The highest value measured appears in the measurement
value display.
Measured value storage
Up to 10 measured values can be stored. In order to save one or
several measured values, please proceed as follows:
1. Press the MODE button (6) three times.
– The indications REC (11) and memory space (12) appear on
the display.
– The value 0 or else the storage location displayed when last
calling up the measured value memory will appear in the
memory space (12) display.
2. Press the SEL button (3) to save the current measured value.
Calling up the measured value memory
The device comes equipped with a measured value memory, in
which up to 10 measured values can be stored. Saved measured
values are preserved even after switch-off.
To call up saved measured values, please proceed as follows:
1. Press the MODE button (6) twice.
– The indications MEM (13) and memory space (12) appear
on the display.
2. Repeatedly press the SEL button (3) until the storage location
with the desired number is displayed.
Calling up the alarm threshold
The value for the alarm threshold is stipulated, can however be
called up at any time:
1. Press the MODE button (6) four times.
– The value 30 ppm is displayed in the measurement value
display (16).
Resetting the zero point
By means of resetting the zero point the prevailing CO
concentration and hence the current measured value is defined
as new reference value (see also
). Therefore, resetting
the zero point should only be effected in the fresh air, thus in
surroundings with the lowest possible CO concentration!
To do so, proceed as follows:
1. Go to a place with a low CO concentration (e.g. fresh air).
2. Press the MODE button (6) four times.
– The alarm threshold (30 ppm) is displayed in the
measurement value display (16).
3. Press and hold the SEL button (3) for approx. 8 seconds until
0
appears in the measurement value display.
– The digit
0
flashes six times.
– Then the device returns to the measuring mode.
Disabling the acoustic warning signal
1. Press the MODE button (6) six times until either
on
or
off
is
displayed.
2. Press the SEL button (3) to select the desired setting.
– When
on
, the acoustic warning signal is enabled.
– When
off
, the acoustic warning signal is disabled. The
MUTE indication (8) appears on the display.
Switching the display illumination on or off
Ex works the display illumination is switched off.
Press the SEL button (3) for approx. 2 seconds, whilst the device
is in normal measuring mode.
– The display's background illumination is switched on or off.
Switch-off
The device comes equipped with an automatic switch-off
function and switches off automatically after 15 minutes of
inactivity.
1. Press the Power button (5) to switch the device off.
