Water Analysis Instruments
Water Auto-Sampler
Model: Stek 300
The ULT200 ultrasonic level transmitter provides reliable non-contact level measurement for liquids, solids and slurries. With advanced echo processing technology, it delivers high accuracy even in challenging industrial environments.
- 24-Hour Response Fast turnaround time
| Model | PT6000 | Stek 300 | ||||||
| Detection Principle | Potassium Dichromate Oxidation Spectrophotometry | Nessler’s Reagent Spectrophotometry | Salicylic Acid Spectrophotometry | Potassium Persulfate Oxidation-Ammonium Molybdate Spectrophotometry | Alkaline Potassium Persulfate UV Digestion UV Spectrophotometry | — | ||
| Measuring Range | 0-20000mg/L | 0-10，20，50mg/L Range Segmentation (Graded Ranges) ：0-2，5 ，10，30，100，500，1000mg/L | 0-1/5/10/30/150 mg/L | 0-1 ，2 ，10，20 ，50，100， 200mg/L | 0-2.5/20/50/100/200 mg/L | — | ||
| Indication Error | Upper Range Limit 20%* | ±5% | 20%* | ±3% | ±3% | TP<0.10 mg/L时， ±0.003mg/L | TN≤0.5mg/L ±0.025mg/L | Sampling Volume Error: ±5% Proportional Sampling Volume Error: ±7% System Clock Time Control Error: ≤0.1% (A1) and Δt ≤ 30 seconds (A12) Refrigerator Temperature Control Error: ±2°C |
| Upper Range Limit：50%* | ±1% | 50%* | ±3% | |||||
| Upper Range Limit：80%* | ±1% | 80%* | ±3% | TP≥0.10 mg/L时，±3% | TN>0.5mg/L ±5% | |||
| 0-1000Upper Range | ±10% | |||||||
| Lower Limit of Quantification (LLOQ) | ≤5mg/L(±30% of reading） | ≤0.05mg/L(±30% of reading） | ≤0.005 mg/L | ≤0.005 mg/L | ≤0.1 mg/L | — | ||
| Repeatability | ≤3% | ≤2% | ≤1% | ±1% | ±3% | — | ||
| 24h Zero Drift | ±5 mg/L | ≤0.005mg/L | ≤0.01 mg/L | Zero Drift：±0.5% | Zero Drift：±3% | — | ||
| Chloride Interference | ±3% | — | ≥720h/cycle | — | ||||
| Real Sample Comparison | Accuracy for COD < 50 mg/L: ≤ ±3 mg/L | NH3N<2 mg/L | ≤0.1mg/L | NH3N<2 mg/L ≤0.1mg/L | TP<0.1 mg/L时，≤ ±0.01mg/L | TN<2mg/L ±0.2 mg/L | — | |
| COD ≥ 50 mg/L: ≤ ±5% of reading | NH3N≥2mg/L | ≤5% | NH3N≥2mg/L ≤5% | TP≥0.1 mg/L时，≤±10% | Tn≥2mg/L ±10% | — | ||
| Minimum Maintenance Interval | ≥720h/cycle | Vertical Sampling Height： ≥ 8m | ||||||
| Measurement Time | ≤40 min | ≤30 min | ≤40 min | ≤45 min | Horizontal Sampling Distance：250m | |||
| Dimensions (H×W×D) | 3 6 0 m m * 2 5 0 m m * 5 0 0 m m ( W * D * H ) + including Pre-treatment Unit | 480*485*1394mm (W × D × H) | ||||||
| Weight | Net Weight<18Kg;Shipping Weight<20Kg | 70kg | ||||||
| Environmental Conditions | Temperature：5 – 40℃:Humidity： ≤90% | Temperature：5～40℃ Humidity：(65±20)% | ||||||
| Power Supply | 90V-250V,50HZ±10% | 220VAC±10%/50-60Hz | ||||||
| Data Interface | Digital Communication: MODBUS protocol via RS232/RS485, RJ45 (dedicated interface for water quality cloud) Analog Output: 4 – 20 mA | Multi-functional Data Transmission Interface: 4- 20mA, RS232, RS485, supports I/O input and output, and has a reserved flow meter communication interface. | ||||||
| Key Features | Low quantification limit (5 mg/L), significantly exceeding national COD analyzer standards, suitable for diverse applications. 5-year reliability design with optimized reagent formula minimizes sulfuric acid corrosion on valves, ensuring long-term stability. Low operational cost: Separate disposal for waste liquid and water; waste generation as low as 6 mL per test. Patented design solves measurement inaccuracies in high-salinity water samples. Patented micro-volume dosing technology (5 μL) guarantees measurement accuracy. | Fully compliant with latest national standards for pollution source monitoring. Separate waste liquid/water disposal minimizes waste volume. Compact design for easy transportation and installation. Customizable solutions based on water conditions to reduce user operational costs. Routine maintenance completed within 5 minutes. Remote diagnostics and maintenance; fault reporting via WeChat QR code scan for precise after-sales service. Compliant with dynamic control technical requirements. | Built-in turbidity and color compensation; resists turbidity interference up to 800 NTU for improved accuracy. Separate waste liquid/water disposal reduces waste volume and operational costs. Low detection limit with auto- dilution and intelligent multi – range switching for diverse applications. Automatic zero andspan verification ensures data accuracy and validity. | Proprietary algorithm and optical design resists turbidity interference up to 800 NTU. High reliability with premium pumps, valves, detectors, and chips. Patented dosing technology ensures precise measurement for complex water matrices. “One-Touch Operation” for simplified use. Optimized reagent formula extends shelf life to 3 months, solving reagent degradation issues. | Innovative UV-catalyzed oxidation technology eliminates digestion tube breakage caused by high temperatures, enhancing instrument reliability. Dual-optical-path measurement system removes interference from organic matter in samples. High-quality imported light source ensures accurate and reliable measurements. Deep-cleaning of critical valves prevents clogging and reduces | Sampling Modes: Quantitative, time-based quantitative, time/flow proportional, and fixed-flow quantitative sampling. Sample Retention: Supports retention for (exceedance), synchronized, direct, serial port controlled, and manual sampling. Sample Distribution: Provides real-time or composite samples to multiple online analyzers simultaneously. Data Logging: Retains records for samples, door access, power outages, and alarms. Self-Diagnostics: Features system fault auto-alarm and status information display/output. Precise Temperature Control: Digital refrigeration ensures accurate and uniform temperature in the storage chamber. | ||
| Typical Applications | Monitors Chemical Oxygen Demand in pollution sources, surface water, and other water bodies. | Monitors Ammonia Nitrogen in pollution sources (industrial & domestic wastewater). | Primarily monitorsAmmonia Nitrogen insurface water,groundwater, pollution sources, and drinkingwater. | MonitorsTotalPhosphorusin pollutionsources,surface water,groundwater,drinkingw ater, and other waterbodies. | Primarily monitors Total Nitrogen in surface water, groundwater, drinking water, and other water bodies (online). | For surface water monitoring (rivers, lakes, reservoirs) and enterprise pollution source discharge outlets. | ||
| Certifications | Software Copyright Registration | |||||||
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