What needs to be done before using the BOD analyzer?

When there are biodegradable organic substances in the water sample, the organic substances are assimilated by the microorganisms in the biofilm, and the cellular respiration of the microorganisms is also enhanced, which consumes part of the dissolved oxygen and reduces the dissolved oxygen diffused to the surface of the oxygen electrode. When the diffusion rate (mass) of dissolved oxygen in the water sample to the electrode reaches a constant again, a constant current is generated again. Since the difference between the two constant currents has a quantitative relationship with the concentration of biodegradable organic matter in the water sample, Therefore, after the current signal is amplified, analyzed and processed by a computer, the device that can directly display the BOD detection result is called a bod tester. Before starting the BOD analyzer, it is necessary to ensure that all reagents are properly placed in place. 1. Initialization work: the initial operation of the instrument; the reagent concentration fluctuates greatly after the reagent is replaced; after the abnormal maintenance of the instrument, when there is no reagent in all the sampling tubes; when the instrument is out of service for more than 3 days, it is recommended to insert the sampling tubes of all reagents into distilled water , do this to flush the instrument. When the instrument is in standby mode, after entering the measurement interface, activate the 'initial liquid filling' button, and it will be completed immediately. 2. Calibration work: Observe the photoelectric signals related to the equipment. In the standby state, adjust the measurement signal of the equipment at 2400, and the high/low signals at 1200. After the initial operation of the instrument and the initialization of the instrument, or at the set calibration time, the instrument executes the calibration procedure. After entering the setting interface, start the 'immediate calibration' to start the calibration procedure immediately; when the instrument clock reaches the set calibration time, the calibration procedure can also be started. 3. Measurement work: Before the instrument performs measurement operation, please ensure that the instrument has been initialized and calibrated. In the standby state of the instrument, after entering the setting interface, start the 'immediate measurement' to start the measurement program immediately; in the standby state of the instrument, the instrument clock reaches the set sampling measurement time, and the measurement program can also be started. 4. Cleaning work: When there is residual liquid in the system that needs to be manually emptied, please perform the following cycle: When the actual temperature is higher than 80°C, wait for the temperature to drop below 80°C, or turn on the fan to force cooling to below 80°C. Manual—Valve Calibration—Digestion Valve—Fast Forward—Select Waste Valve after Pump Stop—Quick Reverse—Select Digestion Valve After Pump Stop. Repeat this until empty.
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