- location-independent count rate
- precise scanning even in filter corners
- low scanning time due to larger probe width (transverse to the scan direction)
- leakage testing of built-in filter systems
Sampling is called isokinetic if the downstream flow velocity of the filter is equal to the flow velocity at the inlet of the probe.
If the downstream flow velocity of the filter (UF), for example, is greater than the flow velocity at the probe inlet (US), part of the airflow will bypass the probe. Large particles, unlike small particles, cannot follow the change in airflow and just they are captured by the probe. The sample is fractionated and the measurement results falsified.
Consequently, it is important that the dimensions of the probe are adapted to the sampling volume flow and the downstream velocity of the filter to ensure compliance with the isokinetic sampling.
|purpose of use||-||isokinetic samplink|
|sample, flow velocity||cm/s||31 ... 47|
|volumetric flow rate, inlet||L/min||28,3|
|hose connector, outlet||mm||Ø 8|
|dimension (length)||mm||150 (without hose connection) | 230 (with hose connection)|