What is light obscuration method?
What is light obscuration method?
Light obscuration works by passing a dilute stream of particles in a liquid suspension between a light source and a detector. In the HIAC 9703+ liquid particle counter, the light source is a laser diode, which illuminates individual particles in the stream to generate a shadow or blockage of light on the detector.
What is light obscuration particle count?
Light obscuration particulate matter testing uses a liquid particle counter machine that, based on the principle of light scattering, allows for an automated determination of the size of particles in a sample and the number of particles according to size.
How do you test particulate matter?
There are basically two tests, light obscuration, which uses light blockage to determine the size and count of particulate matter in the solution; and microscopic assay, which is a measurement of un-dissolvable particles or substances present in the solution – usually plastics, metals or dust.
What is obscuration in PSD?
This light blockage is termed obscuration. The detector measures this reduction in light intensity and using a calibration curve, processes the signal to determine the size of the particle. Light Obscuration is another widely accepted particle sizing technique in many fields.
What is obscuration range?
We use the obscuration, or the amount of light blocked or scattered by the particles, as a measure of the concentration of particles within the Mastersizer 3000. We recommend ranges of obscuration based on the expected particle size, which are different for wet and dry dispersions.
When Coulter Counter apparatus is employed for powder analysis the following criterion is important?
| Q. | When coulter-counter apparatus is employed for powder analysis, the following criterion is important: |
|---|---|
| B. | dispersion medium should be conducting |
| C. | suspended particles should be charged |
| D. | suspended particles should be spherical |
| Answer» b. dispersion medium should be conducting |
What is particle count test?
The particle count is the most important of tests, for confirming that a Clean Room functions in conformity with the specified requirements of the user and of international standards. This test determines the Air Cleanliness and the Classification of the Clean Room as specified in GMP and ISO 14644-1.:2015.
How do you count particles in a clean room?
Particle Counter Flow Rate & Location Sampling To do this you will need this formula: Vs = 20/Cnm) x 1000. Vs is the minimum single sample volume per location. Cnm is the class limit for the largest considered particle size specified for the class of your cleanroom.
What is obscuration per meter?
It is the measurement unit for sensitivity of the smoke detectors. Higher the value of obscuration, higher the smoke concentration levels and lower the visibility. Lower the value, lower is the smoke concentration and higher the visibility. It is measured in obs/m or obs/ft.
What is a obscuration?
/ˌɒb.skjʊəˈreɪ.ʃən/ the act of preventing something from being seen or heard, or something that prevents something else from being seen or heard: Obscuration can be obtained by the use of blackout curtains.
Which test is evaluated by Coulter Counter method?
Red blood cell counts (RBC), mean corpuscular volume (MCV) of red blood cells, and platelet counts may be determined using an automated device such as a Coulter counter to take direct measurements.
