# ISO 17091:2013 pdf free

**ISO 17091**:2013 pdf free.Workplace air一Determination of lithium hydroxide,sodium hydroxide, potassium hydroxide and calcium dihydroxide

When ready to begin the sampling, remove the protective cover or plug from the sampler and switch on the sampling pump. Record the time and volumetric flow rate at the start of the sampling period. If the sampling pump is fitted with an integral timer, check that this is reset to zero. If appropriate (see 9.1.3), measure the atmospheric temperature and pressure at the start of the sampling period using the thermometer (7.1.5.4) and barometer (7.1.5.5), and record the measured values.

NOTE If the temperature or pressure at the sampling position is different from that where the volumetric flow rate was set (see 9.2.3), the volumetric flow rate could change and it might need to be re-adjusted before the sampling.

At the end of the sampling period (see 9.1.2), record the time and calculate the duration of the sampling period. Check the malfunction indicator and/or the reading on the integral timer, if fitted, and consider the sample to be invalid if there is evidence that the sampling pump was not operating properly throughout the sampling period. Measure the volumetric flow rate at the end of the sampling period using the flow meter (7.1.4), and record the measured value. If appropriate ( see 9.1.3), measure the atmospheric temperature and pressure at the end of the sampling period using the thermometer (7.1.5.4) and barometer (7.1.5.5), and record the measured values.

Carefully record the sample identity and all relevant sampling data (see Reference [13]). Calculate the mean volumetric flow rate by averaging the volumetric flow rates at the start and at the end of the sampling period and, if appropriate (see 9.1.3), calculate the mean atmospheric temperature and pressure.Calculate the volume of air sampled, in litres, at atmospheric temperature and pressure, by multiplying the mean flow rate in litres per minute by the duration of the sampling period in minutes.ISO 17091 pdf download.