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Model：
HD-STN
Introduction：
Handheld Total Nitrogen Meter measures total nitrogen in water by the alkaline potassium persulfate digestion UV spectrophotometric method per HJ636-2012 with a 6-hole digester. Widely used for outdoor rapid testing....
The handheld total nitrogen meter is designed with reference to HJ 636-2012, the alkaline potassium persulfate digestion method. Equipped with a high-definition colour LCD touch screen, the Android smart operating system and a bilingual keyboard, it is simple and user-friendly. Together with the 6-position smart digester it enables rapid total nitrogen testing in the field.
Emergency monitoring, industrial wastewater, domestic sewage, sewage treatment, pharmaceutical and chemical plants, food and beverage, textile printing and dyeing, electroplating, papermaking, petroleum and metallurgy, river treatment, research institutes and universities.
1. Android smart operating system for simpler and faster operation.
2. Cloud monitoring platform: results are transmitted wirelessly to the platform for short- and long-term water quality analysis and assisted management.
3. Built-in operating procedures: no training is required and the meter is ready to use out of the box.
4. Fast detection: results are read directly on site.
5. Compact and lightweight: easy to carry for field testing.
6. Small, elegant housing with stable, maintenance-free operation and excellent cost performance.
7. Imported cold light source with stable optical performance and a service life of up to 100,000 hours.
8. AC/DC dual power supply with a built-in rechargeable lithium battery for continuous indoor and outdoor work.
| Measuring item | Total nitrogen (TN) |
| Reference standard | HJ 636-2012 |
| Measuring range | 0.5–30 mg/L, 2–200 mg/L |
| Wavelength selection | Automatic |
| Repeatability | < 0.5% |
| Stability | < 0.5% |
| Sample compatibility | 16 mm (round), 22 mm (round) |
| Colorimetric method | Integrated digestion and colorimetric tube |
| Operating system | Android smart operating system |
| Display | 3.5-inch colour LCD touch screen |
| Sensitivity (absorbance) | 0.001 |
| Operating environment | 0–50 °C, 0–90% RH |
| Data storage | More than 80,000 records |
| Communication | Type-C, Wi-Fi, Bluetooth |
| Printer | Optional portable Bluetooth printer |
| Battery | 5,600 mAh lithium battery |
| Continuous operating time | 8 hours |
| Power supply | 5 V DC |
| Dimensions | 190 × 77 × 72 mm |
| Net weight (main unit) | 325 g |
| Supported language | Simplified Chinese / English |
| Digestion positions | 6 |
| Heating rate | Rises to 165 °C within 10 min |
| Digestion volume | 0–10 mL |
| Temperature control mode | Intelligent PID |
| Temperature control accuracy | ±0.5 °C |
| Digestion temperature | Room temperature – 200 °C |
| Time setting | 0–999 min |
| Digestion well diameter | φ16 mm / 10 mL digestion colorimetric tube |
| Tube depth | 55 mm |
| Display | 3.5-inch colour capacitive touch screen |
| Power consumption | 400 W |
| Preset digestion modes | COD, total phosphorus, total nitrogen |
| Special functions | One-key digestion, over-temperature protection, buzzer prompt, user-defined settings, countdown timer |
| Dimensions | 245 × 163 × 192 mm |
| Weight | < 2.5 kg |
| Language | Chinese / English |
| Ambient temperature | 5–40 °C |
| Relative humidity | ≤ 85% (non-condensing) |
| Power supply | AC (220 ± 22) V, (50 ± 0.5) Hz |
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