Chemical Oxygen Demand Analyzer
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| Brand | Thermo Fisher |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Origin | Domestic (China) |
| Model | Orion™ 3106 COD |
| Instrument Type | Online Analyzer |
| Measurement Principle | Potassium Dichromate Oxidation Digestion (Online Mode) |
| Detection Wavelength | 450 nm |
| Measurement Ranges | 20–200–800–2000 mg/L (auto-ranging) |
| Accuracy | ±5 mg/L (for values <50 mg/L) or ±10% (for values >50 mg/L) |
| Repeatability | ≤5% RSD |
| Limit of Detection (LOD) | 4 mg/L |
| Cycle Time | 40 minutes per sample |
| Sample Throughput | Up to 500 samples per batch |
| Brand | Thermo Fisher Scientific |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic (China-manufactured) |
| Model | Orion 8006cX Online COD Analyzer |
| Instrument Type | Online Analyzer |
| Measurement Range | 0–1000 mg/L and 1000–5000 mg/L |
| LOD | 10 mg/L |
| Chloride Interference Tolerance | up to 5000 mg/L |
| Compliance | HJ/T 399–2007, HJ 377–2019, HJ 35X–2019 |
| Certification | CCEP (China Environmental Protection Product Certification) |
| Brand | Thermo Fisher |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Regional Classification | Domestic (China) |
| Model | AquaEZ 3130 COD |
| Instrument Type | Online Analyzer |
| Wavelength | 450 nm |
| Measurement Range | 10–4000 mg/L |
| Accuracy | ±10% of reading (for samples >100 mg/L) |
| Repeatability | <5% of reading |
| Limit of Detection | 15 mg/L |
| Analysis Time | 45 minutes per cycle |
| Batch Capacity | 30 samples per 30-minute interval |
| Zero Drift | ≤5 mg/L |
| Protection Rating | IP65 / NEMA 4 |
| Power Supply | 100–240 V AC, 50/60 Hz |
| Dimensions (W×H×D) | 510 × 775 × 330 mm |
| Weight | 40 kg (excluding reagents) |
| Operating Temperature | 5–45 °C |
| Relative Humidity | ≤85% RH (non-condensing) |
| Output Interfaces | Dual 4–20 mA analog outputs, RS232 standard, RS485 optional |
| Digital I/O | 2 digital inputs, 8 digital outputs |
| Calibration Modes | Automatic scheduled, manual, and external-triggered |
| Data Storage | Up to 2 years of time-stamped measurement history with event tagging (M = maintenance, D = fault, C = calibration) |
| Display | Color LCD screen showing real-time results, calibration curves, and historical trends |
| Digestion Conditions | 165 °C, duration adjustable from 10–30 minutes |
| Measurement Modes | Continuous, periodic, timed, or external signal-triggered |
| Brand | TIANER |
|---|---|
| Origin | Tianjin, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Portable |
| Measurement Principle | Rapid Digestion Spectrophotometry (Lab-Grade) |
| Wavelength Range | 340–900 nm |
| COD Range | 2–20,000 mg/L |
| Accuracy | ≤ ±5% |
| Repeatability | ≤ ±2% |
| LOD | 0.01 mg/L |
| Digestion Time | 30 min |
| Batch Capacity | 8 samples |
| Display | 7-inch color capacitive touchscreen |
| Data Storage | 1,000,000 measurement records |
| Preloaded Calibration Curves | 1,000 |
| Optical System | Fiber-optic detection with imported cold-light source (≥100,000 h lifetime) |
| Wavelength Accuracy | ±1 nm |
| Spectral Bandwidth | 4 nm |
| Resolution | 0.001 AU |
| Dual-Zone Digestion Block | 8-position, independently controlled (0–200 °C) |
| Power | Integrated 40,000 mAh Li-ion battery |
| Connectivity | USB, RS232, optional Bluetooth |
| Compliance | ISO 9001 & ISO 14001 certified |
| Software | Proprietary water quality analysis platform (registered copyright) |
| Brand | Titan Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Manufacturer |
| Origin Category | Domestic |
| Model | ACOD-30 |
| Pricing | Upon Request |
| Instrument Type | Laboratory Benchtop |
| Measurement Principle | Dichromate Oxidation with Automated Potentiometric/Colorimetric Endpoint Detection (Compliant with HJ 828–2017) |
| Brand | TriOS |
|---|---|
| Origin | Germany |
| Model | LISA 254 |
| Instrument Type | Online Analyzer |
| Measurement Principle | UV Absorption Spectrophotometry at 254 nm |
| Wavelength | 254 nm |
| Measurement Range | 10–5000 mg/L COD<sub>eq</sub> |
| Accuracy | ±5% of reading |
| Repeatability | ±5% RSD |
| LOD | 0.01 mg/L COD<sub>eq</sub> |
| Measurement Interval | 1 s |
| Batch Capacity | 15 samples |
| Optical Path Length Options | 1, 2, 5, 10, or 50 mm |
| Turbidity Compensation | Dual-channel (254 nm + 530 nm) |
| Output Interfaces | 4–20 mA analog, Ethernet (TCP/IP), RS-232/RS-485 (Modbus RTU, TriOS protocol) |
| Power Supply | 12–24 VDC (±10%), ≤1 W |
| Operating Temperature | 2–40 °C (sample & ambient) |
| Pressure Rating | Up to 30 bar (SubConn), 3 bar (fixed cable), 1 bar (flow cell) |
| Enclosure Material | Stainless Steel (1.4571 / 1.4404) or Titanium (3.7035) |
| IP Rating | IP68 |
| Dimensions (10 mm path) | 300 mm × 48 mm |
| Weight (10 mm path, stainless steel) | 1.6 kg |
| Brand | VELP |
|---|---|
| Origin | Italy |
| Model | ECO 8 / ECO 25 |
| Instrument Type | Laboratory Benchtop Digestion Unit |
| Measurement Principle | Closed-Tube Thermal Oxidation (Dichromate Reflux Method) |
| Wavelength for Photometric COD Readout | 610 ± 20 nm (requires compatible spectrophotometer) |
| COD Range | 10–5000 mg/L O₂ |
| Accuracy | ±0.5 mg/L (at low range), ±3% (full scale) |
| Repeatability | ±0.5% RSD |
| LOD | 0.1 mg/L |
| Digestion Time Programmable | 0–199 min or continuous mode |
| Batch Capacity | 8 or 25 samples simultaneously |
| Operating Temperatures | 70, 100, 120, 150, 160 °C (user-selectable, PID-controlled) |
| Safety Features | Transparent polycarbonate lid with overheat cut-off, auto-shutdown after cycle completion, thermal insulation housing |
| Optional Accessory | Alphanumeric tube extractor for ECO 25 |
| Brand | VELP |
|---|---|
| Origin | Italy |
| Model | ECO |
| Instrument Type | Laboratory Digestion Block |
| Digestion Principle | Standard 2-hour Closed-Vessel Oxidation (DIN 38409-H41, ISO 6060, APHA 5220C) |
| Temperature Range | Ambient to 200 °C |
| Thermal Stability | ±0.5 °C (ECO 6/16), ±0.3 °C (ECO 8/25) at 150 °C |
| Heating Time Programmable | 0–199 min |
| Sample Volume Capacity | Up to 200 mL per vial (ECO 6) |
| Batch Capacity | 6 / 8 / 16 / 25 positions |
| Construction | Powder-coated steel housing with chemical-resistant epoxy finish |
| Safety Features | Dual independent overtemperature protection, auto-shutdown on cycle completion, audible end-of-cycle alarm |
| Compliance | Designed for use with EPA Method 410.4, ISO 6060, and DIN 38409-H41 workflows |
| Brand | VELP |
|---|---|
| Origin | Italy |
| Model | ECO6, ECO8, ECO16, ECO25 |
| Power Supply | 220–240 V / 50–60 Hz or 110–130 V / 50–60 Hz |
| Temperature Control Accuracy | ±0.5 °C |
| Max Heating Temperature | ECO6 up to 200 °C |
| Sample Capacity | ECO6: 6 × 20 mL tubes |
| ECO8 | 8 × Ø16 mm + 1 × Ø22 mm tubes |
| ECO16 | 14 × Ø16 mm + 2 × Ø22 mm tubes |
| ECO25 | 25 × Ø16 mm tubes |
| Power Consumption | ECO6: 700 W |
| ECO8 | 140 W |
| ECO16 | 550 W |
| ECO25 | 400 W |
| Weight | ECO6: 5.6 kg (12.3 lb) |
| ECO8 | 2.0 kg (4.4 lb) |
| ECO16 | 3.8 kg (8.4 lb) |
| ECO25 | 3.6 kg (7.9 lb) |
| Dimensions (W × H × D) | ECO6: 198 × 132 × 319 mm (7.8 × 5.2 × 12.5 in) |
| ECO8 | 135 × 95 × 230 mm (5.3 × 3.7 × 9.0 in) |
| ECO16 | 168 × 110 × 269 mm (6.6 × 4.3 × 10.6 in) |
| ECO25 | 155 × 95 × 275 mm (6.1 × 3.7 × 10.8 in) |
| Brand | Water Doctor |
|---|---|
| Origin | Hunan, China |
| Model | Dr-T9001 |
| Instrument Type | Laboratory Benchtop Analyzer |
| Measurement Principle | Rapid Digestion Spectrophotometry |
| Wavelength Range | 340–900 nm |
| COD Range | 2–20,000 mg/L |
| Accuracy | ≤ ±5% |
| Repeatability | ≤ ±2% |
| LOD | 2 mg/L |
| Digestion & Measurement Time | 10 min |
| Wavelength Accuracy | ±1 nm |
| Wavelength Repeatability | < 0.2 nm |
| Spectral Bandwidth | 4 nm |
| Transmittance Error | ±0.5% |
| Transmittance Repeatability | ≤ 0.2% T |
| Optical Stability | ≤ ±0.005 Abs/20 min |
| Resolution | 0.001 Abs |
| Light Source | Imported Cold LED (Lifespan > 100,000 h) |
| Pre-stored Calibration Curves | 1,000 |
| Data Storage Capacity | 1,000,000 records |
| Display | 8-inch HD capacitive touchscreen |
| Sample Holders | Rotatable 16-mm tube position (360°), dual cuvette positions (10 mm & 30 mm pathlength), and four independent digital electrode ports |
| Detection Modes | Absorbance, Transmittance, Concentration |
| Calibration Options | Single-point and multi-point standard calibration |
| Data Export | USB flash drive |
| Housing Material | Corrosion- and heat-resistant ABS |
| Dimensions | 392 × 315 × 170 mm |
| Weight | 4.4 kg |
| Brand | Water Doctor (DoctorWater) |
|---|---|
| Origin | Hunan, China |
| Model | Dr-T9901 |
| Instrument Type | Portable |
| Measurement Principle | Rapid Digestion Spectrophotometry (Lab-Grade) |
| Wavelength Range | 340–900 nm |
| Wavelength Accuracy | ±1 nm |
| Wavelength Repeatability | <0.2 nm |
| Spectral Bandwidth | 4 nm |
| Transmittance Error | ±0.5% |
| Transmittance Repeatability | ≤0.2% T |
| COD Range | 2–20,000 mg/L |
| COD Accuracy | ≤±5% |
| LOD (COD) | 2 mg/L |
| Optical Stability | ≤±0.005 Abs/20 min |
| Resolution | 0.001 Abs |
| Photometric System | Fiber-Optic Detection |
| Display | 5-inch HD Touchscreen |
| Calibration Modes | Single-point & Multi-point |
| Pre-stored Curves | 600 |
| Data Storage | 1,000,000 records |
| Power Supply | Rechargeable Li-ion Battery + AC Adapter |
| Housing Material | Corrosion-Resistant ABS |
| Brand | WIGGENS |
|---|---|
| Origin | Germany |
| Model | WD325 |
| Instrument Type | Laboratory Digestion Block |
| Digestion Principle | Standard 2-Hour Closed-Vessel Thermal Digestion (EPA Method 410.4 Compliant) |
| Temperature Range | 60–200 °C (Fixed 150 °C COD Program) |
| Accuracy | ±2 °C at 150 °C |
| Timer Range | 0–1999 min + Continuous Mode |
| Heating Block Quantity | 1 |
| Display | 4-Digit LED |
| Power Supply | 220 V, 50 Hz |
| Dimensions (W×H×D) | 189 × 116 × 315 mm |
| Weight | 4.5 kg |
| Safety Features | Dual-Temperature Interlock (70 °C Warning Light, 240 °C Auto-Shutdown) |
| Programmable Memory | 3 User-Defined Programs |
| Standard Accessories | Main Unit, Aluminum Heating Block (Ø16.5 × 55 mm), 25 Digestion Tubes |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | 14558 |
| Format | Pre-filled Reagent Tubes |
| Compliance | DIN EN ISO 11732, EPA Method 350.1, DIN 38405-16 |
| Measurement Range (NH₄⁺-N) | 0.5–16.0 mg/L |
| Detection Principle | Indophenol Blue Spectrophotometry |
| Compatible Instruments | photoLab® 6100/6600/7100/7600, NOVA 30/60, Prove®, Move 100, photoFlex®, photoLab S6/S12 |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | C3/25 14541 |
| Certification | DIN 38409-41, EPA 410.4 compliant |
| Packaging | 25 vials per kit |
| COD Range | 25–1500 mg/L |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | C3/25 |
| Instrument Type | Portable COD Analyzer Compatible |
| Measurement Range | 10–150 mg/L |
| Accuracy | ±5% (vs. certified COD standard) |
| Repeatability | ≤3% RSD |
| LOD | 10 mg/L |
| Analysis Time | 2 hours |
| Batch Capacity | 25 tests per kit |
| Compliance | EPA 410.4 & DIN 38409-H41 validated methods |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | WTW OxiTop®-i IS 6 BOD |
| Instrument Type | Laboratory Benchtop Analyzer |
| Measurement Principle | Manometric Respirometry (CO₂-absorbed pressure differential method) |
| Measurement Range | 0–40 mg/L (standard), up to 4,000 mg/L (via sample dilution or reduced volume) |
| Accuracy | <10% deviation from reference value |
| Repeatability | ≤ ±2.8% RSD |
| Measurement Duration | Programmable from 1 to 7 days |
| Sample Capacity | 6 independent channels |
| Display | Individual LCD graphic display per sensor head |
| Temperature Compensation | Automatic thermal equilibration delay (1–3 h) |
| Units | mg/L O₂, ΔhPa, hPa, digit |
| Compliance | Designed for ISO 5815-1:2019, EN 25815, and APHA Standard Methods 5210 B |
| Origin | Imported |
|---|---|
| Type | Benchtop Laboratory Analyzer |
| Model | PhotoLab® S6, PhotoLab® S12, photoLab® 6000 Series |
| Measurement Principle | Rapid Digestion Photometry |
| Wavelength Range | 436 nm, 525 nm, 580 nm, 610 nm, 690 nm (S6) |
| Measurement Range | 0–1000 mg/L COD |
| Accuracy | ±5% of reading |
| Repeatability | ≤5% RSD |
| Detection Limit | 0.1 mg/L COD |
| Analysis Time | ≤30 min per batch |
| Batch Capacity | 15 samples |
| Cuvette Recognition | Automatic barcode-based identification for round and rectangular cuvettes (10 mm, 20 mm, 50 mm path lengths) |
| Compliance | Designed for ASTM D1252, ISO 6060, EN 1484, and US EPA Method 410.4 workflows |
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | TresCon COD-3250 |
| Instrument Type | Online Analyzer |
| Measurement Principle | Potassium Dichromate Digestion Method (Online) |
| Wavelength | 610 nm |
| Measurement Range | 20–1500 mg/L (extendable to 5000 mg/L) |
| Accuracy | ±10% of reading for ≥30 mg/L |
| Repeatability | ≤3% |
| Limit of Detection | 5 mg/L |
| Cycle Time | 35 minutes |
| Batch Capacity | 1 sample per cycle |
| Brand | WTW |
|---|---|
| Model | TresCon COD-3250 |
| Type | Online Analyzer |
| Measurement Principle | Potassium Dichromate Digestion (High-Temperature Closed-System) |
| Wavelength | 620 nm |
| Range | 20–5000 mg/L COD |
| Accuracy | ≤ ±10% at ≥30 mg/L |
| Repeatability | ≤ ±3% |
| Detection Limit | Not Specified |
| Cycle Time | 35 min per sample |
| Sample Throughput | 1 sample per cycle |
| Compliance | Designed to meet GB 11914-1989 and HJ 399-2007 requirements |
| Brand | Zming Environmental Technology Co., Ltd. |
|---|---|
| Origin | Jiangsu, China |
| Model | HQ-3300 |
| Instrument Type | Online Analyzer |
| Measurement Principle | Potassium Dichromate Digestion Method (Online) |
| Measurement Range | 15–500 mg/L (extendable up to 25,000 mg/L, user-configurable) |
| Analysis Cycle Time | 40 minutes |
| Chloride Interference Tolerance | ≤75,000 mg/L |
| Detection Limit | Low (optimized for complex wastewater matrices) |
| Optical System | Dual-beam photometry with automatic turbidity and color compensation |
| Sample Delivery | Capacitive volumetric metering |
| Operating Mode | Unattended, long-term remote monitoring |