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Therefore, for Standard Conditions;

760 TI

QI = QS ( ----- x --------- )

PI 293.18

QI = 2.592 QS (----- ) Equation #2

Example 1:

The instrument is being set up to run at 10 Lpm at Standard Conditions with a flow meter. The

ambient conditions in the set up location are 19 degrees Celsius (292.18 degrees Kelvin) and

765 millimeters of Mercury.

Then;

292.18

QI = 2.592 10.0 (---------- ) = 9.899 Liters per minute

765

Therefore, if you set a Target Flow of 10.0 Lpm on the PQ100 and 9.90 Lpm on the flow meter,

you will always be sampling at 10.0 Lpm to Standard Conditions regardless of changes in the

weather (i.e. regardless of changes in air density). At a later date when you wish to check the

calibration, Equation #2 still applies as in Example 2.

Example 2:

The instrument was set as detailed in Example 1. You are now out of doors at a sampling site.

The conditions are TI = 27 degrees Celsius (300.18 degrees Kelvin) and PI = 750 millimeters of

Mercury.

From Equation #2;

300.18

QI = 2.549 10.0 (---------- ) = 10.37 Liters per minute

750

Therefore, if the PQ100 reads 10.00 Lpm and the bubble meter reads 10.37 Lpm the PQ100 is

still in calibration and is sampling 10.0 Lpm at Standard Conditions.

BGI PQ100 User Manual

Questions and Answers: