Which is better, BOD tester WTW or hash?

WTW BOD tester model: Oxi Top IS6/IS 12.

■ Piezoelectric crystal sensor sensing, simple operation, no mercury measurement by key operation, accurate test and reliable automatic storage function, which can be stored for 5 days.

■ 2 buttons, m shows the current value, s shows the saved value, and 2-digit LED shows 00~ 50, each unit represents 3.55hPa, and the normal value is less than 40. For specific purposes, it is allowed to display larger values, and five sets of data can be saved, one set every day, without reading every day, because the instrument will save the measured values of the day. This means that you can start the measurement at the weekend and check the measurement result (BOD7) after 7 days without special attention.

■ AutoTemp automatic temperature compensation, when the sample temperature is too low, the instrument will delay the determination until the temperature is stable to a certain value. The longest delay time is 3.5 hours and the shortest is 0.5 hours.

■ Suitable for general testing units, laboratories and waste water treatment places, which makes the traditional complicated BOD measurement easy and pleasant.

2.Hash HACH BODTRAKTM water quality rapid analyzer

Hash BOD analyzer is designed according to the measurement principle of pressure difference method. It simulates the biodegradation process of organic matter in nature. Compared with the traditional dilution inoculation method, it is cumbersome, time-consuming and needs special care. This instrument is simple to operate and convenient to test. When the BOD value is less than 700 mg/L, there is no need to dilute. Put the water sample into the test bottle and connect the pressure sensor to the microprocessor control device. The instrument can automatically complete the subsequent test, and the operation process is unattended. When the set culture time is reached, the test system is automatically closed, and the experimental data is stored in the instrument for easy reading. BODTRAK analyzer can select 5 days, 7 days and 10 days for culture, and can make 6 water samples at the same time. During the test, the instrument records the measurement results every 15 minutes, and the measured BOD value can be displayed on the screen. And it can store 480 data points, and the experimental data can be directly downloaded to the computer through HACHLINK software. Technical indicators: measuring range: 0-35 mg/L, 0-70 mg/L, 0-350 mg/L, 0-700 mg/L power supply.

These are all their own advantages. You can compare it yourself. Hash can measure BOD 10 and record it every 15 minutes. At the same time, it seems that the WTW of six water samples is only on the seventh day, and the data is recorded once a day. However, for water samples, BOD5 is usually enough, depending on your needs. I hope it helps you.

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