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Overview of Calibration Method for Online Residual Chlorine Detector

by:BOQU     2023-04-03
The online residual chlorine detector is simply an instrument for quickly detecting residual chlorine. The instrument is equivalent to a small spectrophotometer. After the water sample is reacted with a special reagent, the residual chlorine/total chlorine value is calculated by the spectrophotometric method. . The residual chlorine detector is designed to use the reagents needed in the detection process into a special reagent package, and the instrument itself also contains a standard curve. Users do not need professional knowledge to prepare reagents and curves, and can accurately detect residual chlorine within a few minutes. It is very convenient for enterprises to quickly monitor the content of residual chlorine in water. Chlorine concentration was detected using the DPD colorimetric method. Establish a zero reference point by measuring the absorbance of a blank to compensate for color and turbidity of the sample prior to measuring chlorine. Afterwards, the indicator solution and the buffer solution are added to the sample, and a color reaction occurs in the sample through a magnetic stirring bar. The colorimeter then measures the absorbance that passes through the sample, and compares the resulting absorbance to a reference standard to produce the measurement. The post-sample chamber is filled with new samples, which is repeated every 2.5/10 minutes. Calibration method of online residual chlorine detector: Because the zero current and electrode slope of each residual chlorine electrode are different, with the loss of electrolyte, the zero current and slope will gradually age during use, and increase each time Electrolyte or replacement of permeable membrane will also cause changes in zero current and slope, which requires regular calibration to ensure measurement accuracy. 1. Enter the correct password before entering the menu. 2. Zero point calibration: Arrange the residual chlorine electrode in chlorine-free water, and calibrate the zero point of the electrode. 3. Slope calibration: Arrange the residual chlorine electrode in the solution with known residual chlorine concentration or in the measured water sample to calibrate the slope of the electrode. 3. Follow the screen prompts for zero point calibration, which can be conveniently and intuitively calibrated. After the calibration is completed, you can enter the parameter menu to view the calibration results. 4. Use the up and down keys to move the cursor, select the calibration mode, press OK to start, and press Add after correct calibration to return to the display interface. 5. Calibrate the zero point of the residual chlorine electrode on time, soak the membrane head to clean, and slowly dry the water droplets at the bottom of the electrode with clean filter paper before calibration. Do not wipe the electrode with filter paper to avoid scratching the electrode membrane. Put it in chlorine-free water (such as distilled water, dirty water, etc.), operate the instrument and press the confirmation key to enter, and then operate according to the screen prompts. 6. Before slope calibration, put the residual chlorine electrode in the residual chlorine standard solution of known concentration (stirrer is required), and the electrode can also be put in, press the confirmation key to enter the instrument, and then operate according to the screen prompts. 7. If the residual chlorine standard solution cannot be set, please place the residual chlorine electrode and the electrode directly in the plexiglass measuring cup, connect the water sample, and let the instrument run for about 30 minutes. At this time, use the residual chlorine reagent and pen type residual chlorine meter Or other measuring devices detect the actual residual chlorine value in the water sample, output the actual residual chlorine value to the instrument calibration menu, please output the residual chlorine concentration, then press OK to calibrate, and then press OK to save the marked data.
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