Isokinetic sampling collects particles at the same speed as the stream, increasing accuracy. It’s used for pollution monitoring and equipment checks. It can be expensive, but necessary for reliable results. Inline sampling devices and isokinetic sampling stations can be used, and qualified technicians can take readings.
Isokinetic sampling collects particles in a moving stream that moves at the same speed in the sampling nozzle as elsewhere in the stream. This can increase the accuracy and reliability of your results. It is used for tasks such as monitoring pollution in factory stacks, taking general air samples in an area of interest, and checking equipment for dust and other issues. Numerous products are available for this purpose from suppliers of scientific and test equipment. A technician may be needed to collect samples and install equipment.
The term “isokinetic” comes from the root words meaning “equal” and “movement”. In an isokinetic sampling procedure, the test nozzle is set up to allow the sample stream to enter without changing the velocity. This reduces the risk of concentrating larger or smaller particles. If the flow moves too slowly in the collector, the number of large particles increases. Too fast and large particles are lost. Either way, the sample collected would not be an accurate reflection of what is in the overall stream.
It can be expensive and time-consuming to perform isokinetic sampling. For certain applications, this technique may be recommended or required by law to obtain the most reliable and useful results. In other cases, the technicians may feel that it is appropriate and worth the extra effort to get the best possible sample. Some applications do not require the use of isokinetic sampling and can be accommodated with other techniques to test and evaluate the content of a stream.
Systems such as factory stacks may have inline sampling devices left in place at all times. They regularly take readings and log data. If a problem occurs, some may send signals to alert technicians of a problem, such as an unacceptably large number of particles in the air. These security systems are designed to reduce risks to the public and the environment by identifying problems as early as possible. Periodic cleaning, maintenance and calibration are required to keep them working properly.
In other cases, an isokinetic sampling station can be set up for specific testing purposes. A technician can assess the situation to determine what equipment to use and how to position it. Sample collection can be repeated to confirm results before the technician writes a formal report on what was found in the test. Chemists, air quality specialists and other scientists may be qualified to take and discuss readings and can take them for government agencies, consulting firms and private companies.
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