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
View Top 5 Mobile Chargers in India as on 08 Feb 2023. This rundown is compiled according t...
Recently posted . 5K views . 6 min read
The following list of India's Top 5 Mobile Charger manufacture Brand 2019
Recently posted . 3K views . 0 min read
Rolls Royce cars are extremely luxurious. While there are many expensive pieces of equipment in Rolls Royce cars, their most relaxing feature is the silence that ...
Recently posted . 3K views . 2 min read
XUV300 is the latest entrant in the compact SUV segment.
Recently posted . 3K views . 0 min read
More in Electronics & Gadgets
The following list of India's Top 5 Mobile Charger manufacture Brand 2019
Recently posted. 3K views . 0 min read
This new update comes along the same time when WhatsApp developers are working on adding Sticker support to the app.
Recently posted. 972 views . 0 min read
Fb stated on Thursday a prison challenge against the way it transfers ECU consumer statistics to the use was "deeply wrong" and need to not be mentioned t...
Recently posted. 1K views . 23 min read
Recently posted . 1K views
Recently posted . 1K views
Recently posted . 2K views
Recently posted . 2K views
Recently posted . 1K views . 12 min read
Recently posted . 2K views . 217 min read
Silicon Valley youngster Pi on Monday claimed it had developed the world’s first wireless charger that does away with cords or mats to charge devices. Pi char...
Recently posted. 1K views . 4 min read
Like other portable projectors, you can use the Sony Xperia Touch to beam images up walls, tables, and other flat surfaces. Unlike them, you can interact with any i...
Recently posted. 841 views . 1 min read