How to Calibrate the Ozone Gas Detector?

The ozone gas detector is indispensable for the ozone preparation workshop, chemical industry, petroleum, paper-making, textile, pharmacy, flavors and fragrances. The ozone gas detector is based on the ultraviolet ray absorption principle. Use the steady ultraviolet to generate ultraviolet lines and the light-wave filters to filter out other ultraviolet light of other wavelengths. Only the ultraviolet light with the wavelength of 253.7nm is allowed to pass. The ultraviolet light passes the sample photoelectric sensor and the ozone absorption pool to reach the sampling photoelectric sensor. The electric signals passing by the sample photoelectric sensor and the sampling photoelectric sensor are compared. The mathematical model is calculated to obtain the ozone concentration. After clarifying the principle, we will easily know how to calibrate the ozone detector.

There are two methods to calibrate the ozone gas detector:
First, use the calibration device for calibration. Use the ozone gas detector designed based on the ultraviolet light method to choose ten test points on the ozone detector for comparison. Control the error scope within ±1% to be qualified. Second, use the chemical titration for calibration. The internationally-acknowledged chemical method, namely potassium iodide and sodium thiosulfate titration for detection of the ozone concentration. We will also select ten test points, and compare them with ten points tested by the chemical titration using the ozone detector.

Control the error scope within ±1%. The potassium iodide titration method is based on the principle of using the strong oxidant, ozone, to react with the potassium iodide to separate the iodine out to the water. The water will then take a tea color. The chemical reaction can be written as "O3+2KI+H2O O2+I2+KOH." Following that, use the sodium thiosulfate standard liquid for titration, turning the ionized iodine into the sodium iodine until the reaction terminal point with fully faded water. (The reaction chemical reaction expression can be written as below: I2+2Na2S2O3 2NaI+Na2S4O6.) The oxygen concentration can be written as: C= (Ana×B×2400) / V0 unit: (mg/l) (Note: Ana----Sodium thiosulfate standard solution volume,  ml; B---Sodium thiosulfate standard solution concentration, mol/l; V0-----Other sampling volume of ozone oxidation, ml).