FAQ
| True concentration | = Tube reading X 1013 (hPa) / Atmospheric pressure (hPa) or |
| = Tube reading X 760 (mmHg) / Atmospheric pressure (mmHg) |
FAQ |
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Q7. | If I perform a gas measurement with a gas-detecting tube under pressure, will there be a considerable effect on the tube reading? | |||
| A. | Generally the gas concentration is proportional to the pressure. All detector tubes are calibrated based on normal atmospheric pressure (1013 hPa or 760 mmHg) and their indications will not be affected over the range of plus-minus 10% of normal pressure, that is 912 to 1114 hPa or 684 to 836 mmHg. If the pressure at the time of measurement is not in this range, the tube reading should be corrected as follows.
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