Ammonia nitrogen water quality automatic analyzer

The ammonia nitrogen water quality automatic analyzer has a digital communication interface, which outputs commands, relevant data, and operation logs through the digital communication interface, and can receive remote control commands from the management platform, including remote start, remote timing, and other functions.

　　Ammonia nitrogen water quality automatic analyzerPrinciple:

The mixture of water sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate as a catalyst can effectively oxidize linear fatty compounds), and mercury sulfate solution is heated to 165 ℃. After the oxidation of organic matter in the solution by dichromate ions, the color will change. The analyzer detects this color change and converts it into COD value output. The amount of dichromate ions consumed is equivalent to the amount of oxidizable organic matter.

The reducing inorganic substances in water samples, such as nitrite, sulfide, and ferrous ions, will react with potassium dichromate, affecting the measurement results. The amount of potassium dichromate consumed by them will be recorded in the measurement results, making the measurement results higher.

　　Characteristics of ammonia nitrogen water quality automatic analyzer:

1. It has the function of automatically collecting, storing, processing, querying, displaying, and outputting all data, instrument parameters, and operation logs.

2. It has a large storage capacity and can store historical data for no less than 5 years (with a measurement cycle of 1 hour per time).

3. Equipped with automatic standard sample verification function.

4. It has multiple ranges and can automatically switch ranges, and the instrument displays the final test results.

5. Capable of adding identification to different test data.

6. It has a digital communication interface that outputs commands, related data, and operation logs through the digital communication interface, and can receive remote control commands from the management platform, including remote startup, remote timing, and other functions.

7. Can achieve serial port output and network port output of monitoring data.

8. It has the function of collecting and storing waste liquid and cleaning wastewater separately.

9. Abnormal alarms and power outages will not result in data loss.

10. After abnormal reset and power failure, the instrument will automatically discharge residual reactants and restore working status.

11. Selecting valve components, selecting reagent sampling timing, flexible and diverse channels, with advantages such as minimum dead volume, easy maintenance, and high lifespan.

Main components:

1. Sample injection/metering unit: including sample, standard solution, reagent and other import parts (including sample channel and standard solution channel) as well as metering part.

2. Physical/chemical pretreatment unit: removes interference from the water sample matrix through physical and chemical means, and completes the enrichment, dilution, etc. of the analyte.

3. Reagent storage unit: a functional unit that stores various standard solutions and reagents, ensuring the safety and quality of their storage.

4. Analysis and detection unit: composed of a reaction module and a detection module. The online automatic analysis of the measured substance is completed through the control unit, and the measured value is converted into an electrical signal output part.

5. Control unit: including hardware and software for system control, implementing operations such as injection, digestion, and drainage. It has functions such as data collection, processing, display and storage, security management, data and operation log query and output, output sample retention, trigger sampling, etc.

Ammonia nitrogen water quality automatic analyzerTechnical parameters:

1. Method basis: Dichromate spectrophotometric method.

2. Measurement range: (0-5000) mg/L.

3. Quantitative lower limit: ≤ 15mg/L (indication error ± 30%).

4. Repeatability: ≤± 5%.

5. Low concentration drift: ± 5mg/L.

6. High concentration drift: ≤ 5%.

7. Indication error: Basic range 0-200mg/L.

8. Extended range: indication error: ± 3%, repeatability: ≤ 5%, high concentration drift: ≤ 3%.

9. Chloride ion influence test: ± 10%.

10. Measurement cycle: The measurement cycle is 20 minutes, and according to the actual water sample, the digestion time can be modified arbitrarily within 5-120 minutes.

11. Sampling period: time interval (adjustable from 10 to 9999 minutes) and whole point measurement mode.

12. Calibration cycle: 1 to 99 days, adjustable at any interval and time.

13. Maintenance cycle: usually once a month, about 60 minutes each time.

14. Output: RS-232, RS-485, 4-20mA (optional).

15. Environmental requirements: Indoor with adjustable temperature, recommended temperature range of+5-28 ℃; Humidity ≤ 90% (non condensing).

16. Power supply: AC220 ± 10% V, 50 ± 10% Hz, 5A.

The following interfering factors should be avoided:

1. Organic compounds in glass or the atmosphere may cause serious interference.

Therefore, when preparing reagents and diluting samples for the water quality tester, it is necessary to avoid organic matter from entering the distilled water as much as possible. The glassware used in the test should be blank treated to eliminate the interference of organic matter.

2. A certain amount of chloride can interfere with the oxidation of potassium dichromate. Adding mercuric sulfate to the digestion bottle effectively eliminates the chloride interference from saltwater and estuarine samples.

3. If sulfuric acid is added during the heating of the water sample, the detection data may deviate due to the loss of some volatile substances. Therefore, in order to reduce this error, everyone should add sulfuric acid during the cooling process of the flask.