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6.2.12 HD320A2 probe for the measurement of CO Carbon monoxide
HD320A2 probe measures the carbon monoxide concentration in air. It's a colorless, odorless gas,
lighter than the air and it can cause explosions or fires. It is poisonous even in low quantities:
indeed, it's sufficient a concentration of 10-30ppm of carbon monoxide in air to produce symptoms
of poisoning and about 2000ppm are fatal in less than 30 minutes.
Carbon monoxide is formed when substances containing carbon are burned in absence of oxygen,
or when, although the amount of oxygen is sufficient, the combustion occurs at high temperature,
e.g. in car engines.
Carbon monoxide is one of the major pollutant agents in urban areas. Moreover, being odorless, is
an insidious poison.
Together with the HD320B2 probe, the HD320A2 probe allows analyzing and monitoring the air
quality in internal environments and detecting any loss of CO.
The sensor for the measurement of CO consists of an electro - chemical cell with two electrodes.
CO probe calibration
The probe is calibrated by the company and, usually, doesn't request any intervention by the user.
However, there is the possibility to make a new calibration that corrects the sensor zero:
• in clean air (outside the CO concentration is less than 0,1ppm)
• With the help of nitrogen cylinders (code MINICAN.12A).
CO zero calibration in clean air:
1. Place the instrument in an environment with clean air (outside, far from the companies or
the streets, the CO concentration is less than 0.1ppm), switch the instrument on and wait at
least 15 minutes till the measurements becomes stable.
2. Press SHIFT FNC key: the
and confirm with ENTER.
3. The screen for the operation to do on the sensor appears (calibration or replacement):
4. With Up and Down arrows, select "Cal zero" and confirm with ENTER. The screen for the
calibration of CO sensor appears.
HD32.1
window appears. With ▲▼ arrows select "cal CO"
shortcut
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V2.1
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