CA80TN Total Nitrogen Measurement Introduction
CA80TN total nitrogen analyzer is an industrial instrument used for online water quality monitoring. It measures total nitrogen concentration based on the UV digestion-colorimetric method. This instrument is suitable for scenarios such as wastewater treatment, surface water monitoring, and industrial process control, and can continuously provide accurate total nitrogen (TN) data.
Working Principle
CA80TN converts nitrogen-containing compounds in water samples into nitrate through alkaline potassium persulfate digestion, and then measures absorbance in the ultraviolet region to calculate total nitrogen concentration. This method complies with national standards and has the characteristics of strong anti-interference ability and good stability.
Key Reaction Steps
- The water sample is mixed with digestion reagents and reacts under high temperature and high pressure.
- Organic nitrogen and inorganic nitrogen are converted into nitrate.
- After cooling, measure the absorbance at 220nm and 275nm wavelengths.
- Calculate total nitrogen concentration through the calibration curve.
Technical Parameters
The table below lists the main technical specifications of the CA80TN total nitrogen analyzer for model selection and procurement reference.
| Parameter | Specification |
|---|---|
| Measurement Range | 0–50 mg/L (expandable) |
| Detection Limit | 0.05 mg/L |
| Accuracy | ±2% FS |
| Measurement Cycle | Approximately 45 minutes |
| Output Signal | 4–20 mA, RS485 |
| Power Supply | 220 VAC, 50 Hz |
| Protection Rating | IP54 |
Installation and Wiring
Correct installation is the prerequisite for ensuring measurement accuracy. Please follow the steps below and pay attention to electrical safety.
Installation Steps
- Choose a flat, ventilated location without strong electromagnetic interference to fix the instrument.
- Connect the sample inlet tube, waste discharge tube, and reagent tube to ensure no leakage.
- Connect the power supply and signal lines according to the wiring diagram, and ensure reliable grounding.
- Turn on the power and preheat for 30 minutes.
Operation and Calibration
Daily operations include starting measurement, viewing data, and regular calibration. It is recommended to use standard solutions for two-point calibration to ensure data accuracy.
Calibration Process
- Enter the menu and select the "Calibration" mode.
- Measure the zero point and standard solution in sequence, and the instrument automatically calculates the slope.
- Save the calibration results and record the calibration date.
Maintenance and Troubleshooting
Regular maintenance can extend the instrument's lifespan and reduce failures. Common problems include pipeline blockage, expired reagents, and light source attenuation.
Maintenance Points
- Check reagent levels weekly and replace them promptly.
- Clean the digestion cell and colorimetric cell monthly.
- Check the peristaltic pump tube quarterly and replace it if necessary.
- Calibrate the light source and detector once a year.
Common Faults and Solutions
- High measured value: Check whether the reagent is contaminated or the calibration has failed.
- No data display: Check the power supply, signal lines, and communication settings.
- Alarm prompt: Refer to the manual code table and troubleshoot the corresponding components.
Summary
With its stable digestion-colorimetric method and user-friendly operation interface, the CA80TN total nitrogen analyzer has become a reliable choice for water quality total nitrogen monitoring. Following this manual for installation, operation, and maintenance can ensure long-term accurate measurement.