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Frequently Asked Questions

SKC is defined by a deep-rooted mission and commitment to serving people through science. Our passion is harnessing the power of science to create solutions that make a difference. The knowledge, experience, and expertise we have gained from over 60 years of creating those solutions is a wealth of information we share to help you in your important mission to protect the health and safety of workers.

We hope you find these FAQs helpful. Feel free to reach out to our Technical Services Team for further assistance.

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I see there are several PPI respirable dust models optimized to different flow rates. Which PPI do I need, the 2 L/min or 4 L/min model? +

In a typical respirable dust scenario, the 2 L/min PPI Sampler (gold) works well for full-shift sampling. If the area does not have much dust and you are concerned about not collecting enough dust on the filter to meet the minimum weight for analysis, using a 4 L/min PPI Sampler (orange) will help ensure sufficient dust collection.

Additionally, if you are performing task-based sampling, you can ensure that there will be sufficient dust collection for analysis by using the higher flow rate option.

When using the SKC NoiseCHEK Personal Dosimeter, what are the available datalogging options, how are they different, and when do I use each? +

SKC NoiseCHEK features two options for logging data: 1 second and 60 seconds. Here are our recommendations for application of each:

  • Sample rate 60 seconds means that one data point is saved every 60 seconds. The 60 second sample rate is the default setting. Because there are fewer data points, this is a good option if the amount of data points meets your application and provides for a significantly shorter data download time.
  • Sample rate 1 second means that one data point is saved every second. This would yield 60 data points every minute.

The 1 second sample rate is an excellent choice if very detailed sound level information is required for your application; however, it can result in very long data download time.

When using 226-120 sorbent tubes, can I sample at a higher 1 L/min flow rate? +
SKC does not recommend a higher flow rate of 1 L/min when sampling with the 226-120 sorbent tube during the length of a standard work shift. The higher flow rate for that length of time may be too fast to allow effective adsorption of sampled chemicals on the tube’s sorbent material. However, the higher flow could be used if:
  • The sampling time is shortened so that the maximum sample volume is not exceeded.
  • The increase back pressure caused by a higher flow rate does not exceed sampling pump capabilities.
Do I need a pre-weighed filter cassette for silica sampling? +

In short, most samples taken for silica are analyzed for both respirable dust and silica. The respirable dust is a gravimetric measurement to determine the weight of the respirable dust, and the silica is a component of that dust, usually between 10-20%.

If a customer is trying to determine % silica and the silica result, they will need the pre-weighed filter option because there is weighing involved. If they are only concerned with silica, and have no need for respirable dust information, then they would not need a pre-weighed filter.

Which sample bags are recommended for sampling sulfides? +

231 and 232 Series Tedlar® Sample Bags show good stability for natural gas, methane matrix, low level sulfur compounds, hydrogen sulfide, carbonyl sulfide, and other gases.

252, 253, 262, and 263 Series FlexFoil® Sample Bags show good stability for hydrogen sulfide and carbonyl sulfide. For more information on FlexFoil performance, see the SKC Bag Stability Report.