Inspection items and related requirements for the use of online residual chlorine meter

The online residual chlorine meter has been calibrated by DPD method before leaving the factory. If the measured value is found to be inaccurate during use, it is necessary to re-zero and calibrate the instrument. 1. Zeroing Add about 1ml of deionized water to the colorimetric tube, then add 1 piece of DPD residual chlorine test piece, soak for 1 minute, then gently crush and fully dissolve with a clean glass rod (accessory), add no Add chlorine to the 10ml mark and shake well, wipe off the water stains on the glass surface of the colorimetric tube with rolling paper, put it on the colorimetric seat of the instrument, align it with the scale line on the measuring cell of the instrument, and cover it with a shading cover. Quickly adjust the 'return to zero' potentiometer on the rear panel of the instrument within 4-5 minutes after adding the DPD reagent to display 0.00mg/L. 2. Correction Add about 1 ml of 2.5mg/L--DPD residual chlorine standard solution to the colorimetric tube, then add a piece of DPD residual chlorine speed test piece, soak for 1 minute, gently crush and dissolve with a clean glass rod, Add 2.5mg/L--DPD residual chlorine standard solution to the 10ml mark, dry the water stains on the glass surface of the colorimetric tube with roll paper, put it in the colorimetric seat of the instrument, align the instrument to measure the scale line on the battery and Close the shading cover. Quickly adjust the 'calibration' potentiometer on the rear panel of the instrument within 4-5 minutes after adding the DPD reagent to display 2.50 mg/L. Note: When using the o-toluidine reagent method for determination, the user needs to prepare the potassium dichromate residual chlorine standard solution and the use solution by himself, and the instrument can only be used after calibration. Refer to GB/T 'Standard Test Methods for Drinking Water' for the preparation and use of standard solutions. The residual chlorine meter is a precision measuring instrument combined with photoelectricity. Read the instructions carefully before operation and operate correctly to obtain accurate measurement results. Relevant requirements for the use of online residual chlorine meter: 1. The use environment must meet the working conditions. 2. The measuring pool must be kept clean, dry and dust-free for a long time, and the hood must be covered when not in use. 3. If it is used in a humid climate, the start-up time must be extended accordingly. 4. The solution to be tested should be poured carefully along the wall of the sample bottle to prevent air bubbles from affecting the measurement accuracy. 5. After the sample bottle or standard solution is replaced and repaired, it must be recalibrated. 6. When the low voltage 'LOBAT' is displayed in the upper left corner of the display, the battery should be replaced in time to avoid affecting the measurement. 7. After adding the DPD reagent, the whole test should be completed within 4-5 minutes, otherwise the test result may be inaccurate. When testing, the scale line on the colorimetric bottle should be aligned with the scale line on the test seat of the instrument and pressed to the bottom (the interior is positioned by a steel ball). 8. Non-professional maintenance engineers, please do not open the instrument for maintenance.
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