50
CO/CO
2
measurement
Ambient CO measurement
Switch-on - Initialisation - Zeroising phase (60 s). The CO sniffer is zeroised during the zeroising
phase.
• Open protective cap.
• Attach probe to shirt pocket for example. The direction from which the gas flows on the probe
influences the accuracy of the measurement. Optimum measured results are reached by moving the
probe gently back and forth. Frontal flow on the sensor leads to inaccurate readings.
• Close protective cap.
Connect the probe before switching on the instrument.
The protective cap should be closed during the initialisation phase (otherwise
the measurements may be incorrect).
The protection cap should only be opened for the duration of the measurement, close cap
straight after measurement (mechanical protection of sensor and adherence to accuracies).
Cigarette smoke influences the measurement (min. 50 ppm).
A smoker´s breath influences the measurement by approx. 5 ppm).
CO measurement
The connected 0632 1247 probe is initialised in the switch-on phase. For this reason the
measuring instrument should only be switched on in a CO-free environment, otherwise the values
subsequently measured may be too low!
For further initialisation in a switched on instrument, place the probe in a CO-free environment.
Allocate one of the function buttons with CO=0 and then press this function.
The 0632.1240 probe measures concentrations from 0 to 1 vol % CO
2
. The unit can be switched
to ppm in the main menu under INSTRUMENT - U
NITS - Gas.
The measuring principle is based on infrared absorption. Due to its sensors, the probe has a
relatively high power consumption. Use mains unit and rechargeable batteries for long-term
measurements.
Note! The correct reading appears after the instrument is switched on following a warm-up
phase of 1 to 2 minutes.
If there are large changes in the concentrations, the probe will need 30 to 60 s in order to adapt to
conditions. The adaptation time can be reduced by swaying the probe gently back and
forth.
I
The CO
2
value depends on the absolute air pressure. This effect is compensated in the instrument.
Enter the correct absolute pressure of the measurement location in the main menu under SPECIAL
- P
ARAMETER (refer to barometric measurement on page 43). The CO2 value
is automatically compensated according to the specified absolute pressure.
CO
2
measurement
i
Absolute pressure
Keep the probe as far away as possible from your body in order to avoid the
influence of the CO
2
in your breath.
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