Ammonia nitrogen in water refers to ammonia that exists in the form of free ammonia, mainly derived from the decomposition products of nitrogen-containing organic matter in domestic sewage by microbial action, industrial wastewater such as coking synthetic ammonia, and agricultural drainage. When the ammonia nitrogen content in water is high, it exhibits toxic effects on fish and poses varying degrees of harm to humans. The determination of ammonia nitrogen content in water is helpful in evaluating the pollution and "self purification" status of water bodies, therefore, ammonia nitrogen content is an important indicator for characterizing water quality pollution.
After mixing the water sample and masking agent, the ammonia nitrogen formed as free ammonia or ammonium ions reacts with salicylic acid colorimetric reagent in an alkaline environment and in the presence of sensitizers to generate a colored complex. The analyzer detects the color change and converts it into ammonia nitrogen value output. The amount of colored complex generated is equivalent to the ammonia content.
1. The digestion colorimetric process of the instrument is completed in one, with a simple and reliable structure, reducing the possibility of errors.
2. Adopting imported modified polytetrafluoroethylene transparent hose with a diameter greater than 1.5mm, reducing the probability of particle blockage in water samples.
3. It can automatically clean the sampling pipeline to prevent the formation of algae or biofilm.
4. After abnormal reset and power failure, the instrument will automatically discharge residual reactants and restore working status.
5. Low failure rate, minimal maintenance, and low reagent consumption.
6. The intelligent fault self diagnosis function, alarm prompt, instrument management and maintenance are very convenient.
7. Adopting multi-channel valves, it has strong anti-corrosion performance, long service life, and is safe and reliable.
model | YK-DH311N1 |
Method basis | HJ/T 101-2003 "Technical Requirements for Ammonia Nitrogen Water Quality Automatic Analyzer" - Salicylic Acid spectrophotometric method |
measuring range | 0.1~300mg/L ammonia nitrogen |
Accuracy | Indication error ≤± 10% |
Repetitive error | ≤±5% |
Measurement cycle | The minimum measurement cycle is 20 minutes, and according to the actual water sample, the digestion time can be arbitrarily modified within 5-120 minutes |
sampling period | Time interval (adjustable from 20 to 9999min) and hourly measurement mode |
correcting | The instrument can perform sensitivity and zero calibration at regular intervals |
Calibration cycle | Adjustable at any interval and time from 1 to 99 days |
Maintenance cycle | Usually once a month, about 30 minutes each time |
Analog output | 1-channel 4-20mA output (optional 2-channel 4-20mA output) |
Signal interface | RS232 or RS485 |
Switching quantity | Optional 1-6 relay outputs, capacity 220VAC/2A |
Comparison of actual water samples | Error ≤± 10% |
MTBF | ≥ 720h/time |
Environmental requirements | Suggested temperature+5-28 ℃; Humidity ≤ 90% (non condensing) |
Size | Height 1430 x Width 500 x Depth 403 (mm) |
Power Supply | AC220±10%V，50±10%Hz，5A |
other | Abnormal alarms and power outages will not result in data loss; Touch screen display and command input; After abnormal reset and power failure, the instrument will automatically discharge residual reactants from the device and restore its working state |
Typical applications | Online monitoring of import and export water quality of municipal sewage treatment plants, online monitoring of industrial pollution source wastewater, and industrial process use Online monitoring of water, etc |
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