Overview
The BOD5-870 direct-reading BOD tester is a professional water quality testing equipment from JINGQI brand for the measurement of five-day biochemical oxygen demand (BOD) of water samples. The instrument adopts a direct-reading design, which can process 8 water samples simultaneously, foster at 20 +/- 1 ° C thermostatic conditions, and directly read the BOD value through the principle of pressure difference detection.
Features
1. Direct reading display, easy and intuitive to operate
2. Batch processing capacity of 8 water samples, high detection efficiency
3. The measurement range is 0~ 1000mg/L, with a wide range of applications
4. Foster temperature precise control at 20 ℃ +/- 1 ℃, in line with standard requirements
5. Instrument small size (400 * 270 * 350mm), light weight (6kg), easy to place and move
6. Low power consumption (< 15W), energy saving and environmental protection
Principle
The water sample or the pretreated water sample is injected into the foster bottle, and the carbon dioxide absorber (NaOH) is placed in the absorption cup of the bottle mouth, and the special biochemistry cultivating box is placed after sealing. After five days of foster under the thermostatic condition of 20 +/-1 ℃, the water sample undergoes biological oxidation reaction under Stir, and the organic matter is converted into nitrogen, carbon and sulfur oxides. The generated carbon dioxide is absorbed by sodiumhydrate, and the oxygen in the upper space of the foster bottle is continuously supplied to the microbial oxygen demand, resulting in a pressure difference. The BOD value of the water sample during the specified period is calculated by detecting the height of Hg in the glass tube.
Applications
Water quality testing, environment monitoring, sewage treatment, laboratory analysis
Steps
1. Inject the water sample or pretreated water sample into the foster bottle
2. Put carbon dioxide absorber (NaOH) in the bottle mouth absorption cup.
3. sealing foster bottle
4. Place the foster bottle in a dedicated biochemistry cultivating box
5. Five days of thermostatic foster at 20 +/- 1 ° C
6. Biological oxidation reaction at stirring speed
7. Detect the height of mercury in glass tubes
8. Calculate the BOD value of the water sample
Notice
• Ensure that the foster temperature is strictly controlled within the range of 20 +/- 1 ° C
• Foster bottles must be completely sealed to ensure detection accuracy
• Carbon dioxide absorber (NaOH) needs to be placed correctly as required
Maintain proper stirring speed during operation
• Hg height detection requires accurate reading
• Water sample pretreatment should meet relevant requirements
