Turbidity Sensor Calibration Procedure at Instronline
Friday, September 14, 2018 IST
The turbidity method is based upon a comparison of intensity of light scattered by a sample under defined conditions with the intensity of light scattered by a standard reference suspension. A turbidimeter is a nephelometer with a visible light source for illuminating the sample and one or more photo-electric detectors placed ninety degrees to the path of the light source. Note: the below calibration procedure is for a turbidimeter which the sample is placed into a cuvette.
Some instruments will only accept one standard. For those instruments, the second, third, etc., standards will serve as check points.
Calibration Procedure:
1. Allow the calibration standards to equilibrate at the ambient temperature. The use of commercially available polymer primary standards (AMCO-AEPA-l) is preferred; however, the standards can be prepared using Formazin (read the warning on the label before use) according to the EPA analytical Method 180.1. Other standards may be used if they can be shown that they are equivalent to the previously mentioned standards.
2. If the standard cuvette is not sealed, rinse a cuvette with deionized water. Shake the cuvette to remove as much water as possible. Do not wipe dry the inside of the cuvette because lint from the wipe may remain in the cuvette. Add the standard to the cuvette.
3. Before performing the calibration procedure, make sure the cuvettes are not scratched and the outside surfaces are dry and free from fingerprints and dust. If the cuvette is scratched or dirty, discard or clean the cuvette respectively. Note: some . manufacturers require the cuvette to be orientated in the instrument in a particular direction for accurate reading.
4. Select a low value standard such as a zero or 0.02 NTU and calibrate according to manufacturer’s instructions. Note: a zero standard (approximately 0 NTU) can be prepared by passing distilled water through a 0.45 micron pore size membrane filter.
5. Select a high standard and calibrate according to manufacturer’s instructions or verify the calibration if instrument will not accept a second standard. In verifying, the instrument should read the standard value to within the specifications of the instrument. If the instrument has range of scales, check each range that will be used during the sampling event with a standard that falls within that range.
6. Record the calibration information on calibration log sheet.
Related Topics
Trending News & Articles
Lung cancer is usually not noticeable during the early stages. Most people are diagnosed when the disease is at an advanced stage. According to Cancer.org, it is ...
Recently posted . 9K views . 2 min read
The scientists likewise shared how much liquor an individual can drink prior to facing overabundance risk challenges their wellbeing, contrasted with somebody who...
Recently posted . 8K views . 1 min read
The health benefits of wood apple include [1] relief from constipation, indigestion, peptic ulcer, piles, respiratory problems, diarrhea, and dysentery. It also b...
Recently posted . 6K views . 2 min read
Bael, also known as the “Wood Apple”, is a species native to India. The bael tree is considered to be sacred to the Hindus. A famous drink known as sh...
Recently posted . 6K views . 2 min read
More in Electronics & Gadgets
If you’re like most folks, you love to slather your food in butter or olive oil. In moderation, these fats can be healthy. Of course, there are those who woul...
Recently posted. 980 views . 1 min read
A common bacterium found in improperly cooked chicken can cause Guillain-Barre Syndrome - the leading cause of acute neuromuscular paralysis in humans, res...
Recently posted. 1K views . 20 min read
India’s largely unorganised healthcare sector is focused on curing sick people rather than preventing sickness itself
In...
Recently posted. 898 views . 40 min read
Recently posted . 1K views
Recently posted . 1K views
Recently posted . 2K views
Recently posted . 2K views
Recently posted . 3K views . 126 min read
Recently posted . 2K views . 46 min read
Scientists have developed coatings for dental implants that can prevent bacterial infection, kill it if it arises, as well as facilitate anchoring to the bone.
...
Recently posted. 1K views . 13 min read
Being 40 is wonderful. You’re smart, sophisticated, and you no longer worry about the little things. If you have kids — they are old enough that you c...
Recently posted. 1K views . 2 min read