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Division 4.2.2.1 Weighing chamber (or room) conditions

Original text. Later amendments are not shown.

  1. (a)

    The temperature of the weighing chamber (or room) in which the particulate sampling filters are conditioned and weighed shall be maintained to within 22 °C ± 2 °C (22 °C ± 1 °C if possible) during all filter conditioning and weighing.

  2. (b)

    Humidity shall be maintained at a dew point of less than 10.5 °C and a relative humidity of 45 per cent ± 8 per cent.

  3. (c)

    Limited deviations from weighing chamber (or room) temperature and humidity specifications shall be permitted provided their total duration does not exceed 30 minutes in any one filter conditioning period.

  4. (d)

    The levels of ambient contaminants in the weighing chamber (or room) environment that would settle on the particulate sampling filters during their stabilisation shall be minimised.

  5. (e)

    During the weighing operation no deviations from the specified conditions are permitted.