Method and apparatus for taking gaseous samples from gas conduits.

摘要

In a method of taking gaseous samples from a gas conduit (1) through which an essentially gaseous flow is conducted, sample gas is withdrawn from the gas conduit (1) into a probe (2) inserted into the gas conduit. Diluting gas is supplied to the sample gas in the probe through a supply line (4), whereafter the sample gas together with the diluting gas is withdrawn from the probe (2). The delivery of the diluting gas supplied to the probe is measured and/or controlled in the supply line (4) and the delivery of the sample gas together with the diluting gas withdrawn from the probe is measured and/or controlled in a location within a discharge line (6). On the basis of these deliveries the delivery of the sample gas is calculated. The sample gas diluted by the diluting gas is collected for analysis between the probe and the measure and/or control location in the discharge line (6). The invention also includes an apparatus for performing this method.