1Introduction

This instrument features a liquid crystal display, a separate design for the digester and host, built-in curves, a built-in printer, and a USB interface for uploading data. It is widely used in environmental monitoring, sewage treatment, large, medium, and small water plants, industrial and mining enterprises, domestic or industrial water use, universities, research institutions, and other departments. The specific models are as follows:

TW-5288 COD analyzer

TW-5298 Ammonia Nitrogen Analyzer

TW-5225 Total Phosphorus Analyzer

TW-5235 Total Nitrogen Analyzer

TW-5255 COD · Ammonia Nitrogen · Total Phosphorus Analyzer

TW-5265 COD · Ammonia Nitrogen · Total Phosphorus · Total Nitrogen Analyzer

2Instrument features

1) The separation of the measuring instrument and the digestion instrument does not affect the stability of the optical system.

2) The measuring instrument is a cold light source and narrowband interferometric optical system with good optical stability.

3) The digestion instrument has PID automatic temperature control and timing, with high accuracy.

4) Simple and time-saving operation. Dissolving colorimetric does not require changing the tube.

5) The digestion temperature and time can be infinitely set for other purposes.

6) 10 standard curves and 99 measured values of COD, ammonia nitrogen, total phosphorus, and total nitrogen can be saved separately without loss during power outage.

7) LCD large screen LCD display, easy and intuitive operation.

8) Equipped with factory working curve recovery function.

9) Printing function: It can print test records immediately or query records for printing.

3. Main technical indicators

1) Measurement range: (measured after dilution in excess range)

COD：（5～2000）mg/L；

Divided into three ranges: (5-200) mg/L, (200-1000) mg/L, and (1000-2000) mg/L

Ammonia nitrogen: (0.02-25) mg/L; Divided into two ranges: (0.02-5) mg/L and (5-25) mg/L

Total phosphorus: (0.00-10) mg/L; Divided into two ranges: (0-2) mg/L and (2-10) mg/L

Total nitrogen: (0.5-100) mg/L; Divided into two ranges: (0.5-10) mg/L and (10-100) mg/L

2) Indication error: COD: ≤± 5%; Ammonia nitrogen: ≤± 3% (F.S); Total phosphorus: ≤± 5% (F.S); Total nitrogen: ≤± 3%

3) Repeatability: ≤ 3%

4) Anti chlorine interference: ≤ 2000mg/L (COD determination)

5) Temperature control system: (room temperature~180) ℃ can be set

CODThe digestion temperature is 165 degrees Celsius℃, total phosphorus digestion temperature: 120 ℃, total nitrogen digestion temperature: 125 ℃

6) Temperature control accuracy: ± 1 ℃

7) Dissolving time: adjustable from 1 to 999 minutes

CODThe digestion time is 15 minutesThe total phosphorus digestion time is 30 minutes, and the total nitrogen digestion time is 30 minutes

8) Optical stability: The instrument's absorbance value drifts less than 0.002A within 20 minutes

9) Batch processing capacity: 16 water samples

10) USB interface, can be connected to a computer.

11) Environmental temperature: (5-45) ℃;

12) Relative humidity: ≤ 85%;

13) Power supply:AC220V(165V-240V)；

14) External dimensions:400x310x158mm；

15) Weight: 5kg;

16) Power consumption:<30W