Dissolved Oxygen Meter
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| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic |
| Model | L-501 (Fluorescence Method) |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence Quenching |
| Measurement Range | 0–99.00 mg/L |
| Accuracy | ±0.1 mg/L |
| Repeatability | ≤±0.05 mg/L |
| Detection Limit | 0.01 mg/L |
| Display | 7-inch Color Touchscreen |
| Parameters Displayed | DO Concentration (mg/L), Saturation (%), Temperature (°C/°F) |
| Temperature Compensation | Automatic & Manual |
| Electrode Status Monitoring | Intelligent Diagnostic Algorithm |
| Sensor Design | Solid-State Fluorescent Cap, No Electrolyte, No Polarization Required |
| Cap Replacement | Tool-Free, Quick-Swap Mechanism |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-503 |
| Instrument Type | Benchtop Laboratory Analyzer |
| Measurement Principles | pH (glass electrode), Conductivity (4-electrode AC conductivity), Dissolved Oxygen (fluorescence quenching), Temperature (Pt1000 RTD) |
| pH Range | 0.00–14.00 |
| pH Accuracy | ±0.01 pH |
| pH Repeatability | ≤±0.01 pH |
| Conductivity Range | 0.000 µS/cm–2000 mS/cm |
| Conductivity Accuracy | ±0.5% FS |
| Conductivity Detection Limit | 0.01 µS/cm |
| DO Range | 0.00–99.00 mg/L |
| DO Accuracy | ±0.2 mg/L |
| DO Repeatability | ≤±0.1 mg/L |
| DO Detection Limit | 0.01 mg/L |
| Temperature Range | –5.0 to 55.0 °C |
| Temperature Accuracy | ±0.2 °C |
| Display | 7-inch capacitive color touchscreen (1024×600) |
| IP Rating | IP54 |
| Data Storage | Internal memory for ≥2000 datasets with timestamp, operator ID, and audit trail metadata |
| Compliance | Supports GLP/GMP data integrity requirements including user-defined access levels, electronic signature readiness, and calibration history logging |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | L-701 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based Dissolved Oxygen (DO) Detection |
| DO Range | 0–99.00 mg/L |
| DO Accuracy | ±0.5% of reading (ion concentration), ±0.01 pH |
| Repeatability | ≤±0.2% |
| Detection Limit | 0.01 mg/L |
| pH/pX Range | –2.00 to 20.00 |
| pH Resolution | 0.01 pH |
| mV Range | –1999.9 to +1999.9 mV |
| mV Resolution | 0.1 mV |
| Temperature Compensation | Automatic & Manual |
| Display | 7-inch color TFT capacitive touchscreen |
| Operating System | Built-in bilingual (English/Chinese) firmware with adjustable brightness, time stamping, and °C/°F switching |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | M901 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence Quenching (DO), Potentiometric (pH) |
| DO Range | 0–99.00 mg/L |
| pH Accuracy | ±0.002 |
| mV Accuracy | ±0.1 mV |
| pH Repeatability | ≤±0.001 |
| mV Repeatability | ≤±0.1 mV |
| pH Range | −2.00 to 20.00 |
| pH Resolution | 0.001 |
| mV Resolution | 0.1 mV |
| Display | 7-inch color capacitive touchscreen |
| IP Rating | IP54 |
| Temperature Compensation | Automatic/manual with integrated high-stability temperature electrode |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | M902 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based Dissolved Oxygen (Note: *Correction required — device is a conductivity meter |
| Conductivity Range | 0.000 μS/cm to 2000 mS/cm |
| Accuracy | ±0.5% FS (Conductivity) |
| Repeatability | ≤ ±0.2% |
| Detection Limit | 0.01 μS/cm |
| Display | 7-inch color capacitive touchscreen |
| Temperature Compensation | Automatic/manual with integrated high-stability temperature electrode |
| IP Rating | IP54 |
| Data Compliance | GLP-compliant audit trail, calibration history logging, method recall, USB/printer/computer connectivity |
| Calibration | Multi-point (1–5 points), auto-standard recognition, calibration expiry alert |
| Sample Handling | Built-in magnetic stirrer, endpoint stability criteria configurable |
| Environmental Protection | Dust and splash resistant (IP54) |
| Brand | Yoke |
|---|---|
| Origin | Shanghai, China |
| Model | M907 |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence Quenching |
| DO Range | 0–99.00 mg/L |
| DO Detection Limit | 0.01 mg/L |
| DO Accuracy | ±0.5% of reading (ion concentration) |
| Repeatability | ≤±0.2% |
| Display | 7-inch color capacitive touchscreen |
| pH/pX Range | −2.00 to 20.00 |
| pH/pX Resolution | 0.01 (default), selectable to 0.001 or 0.1 |
| mV Range | −1999.9 to +1999.9 mV |
| mV Resolution | 0.1 mV (selectable to 0.01 or 1) |
| Temperature Compensation | Automatic/manual with integrated high-stability temperature electrode |
| Data Management | GLP-compliant storage, audit trail, method recall, USB/printer/PC connectivity |
| Enclosure Rating | IP54 |
| Ion Modes | Direct concentration, standard addition, sample addition, Gran plot |
| Supported Ions | H⁺, Ag⁺, Na⁺, K⁺, NH₄⁺, Cl⁻, F⁻, and user-definable |
| Units | mg/L, g/L, mol/L, pX |
| Calibration Tracking | Auto-log with expiry alert |
| Stirring | Integrated magnetic stirrer |
| Endpoint Detection | Configurable stability criteria |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | PRO1020 |
| Measurement Parameters | Temperature, pH, Dissolved Oxygen (DO) |
| DO Method | Polarographic (Clark-type) or Galvanic Cell (user-selectable) |
| DO Range | 0–50 mg/L (0–500% air saturation) |
| pH Range | 0–14 |
| pH Resolution | 0.01 |
| pH Accuracy | ±0.2 |
| Temperature Range | –5 to +55 °C |
| Temperature Accuracy | ±0.2 °C |
| ORP Range | –1500 to +1500 mV |
| ORP Accuracy | ±20 mV |
| DO Resolution | 0.01 or 0.1 mg/L (selectable) |
| DO Accuracy | ±2% or ±0.2 mg/L (0–20 mg/L), ±6% (20–50 mg/L) |
| Data Storage | 50 measurement sets |
| Display | Backlit LCD with dual backlight (screen + keypad) |
| Enclosure Rating | IP67 |
| Dimensions | 8.3 × 21.6 × 2.3 cm |
| Weight | 475 g (with batteries) |
| Power | Two AA alkaline batteries |
| Cable Options | 1 m / 4 m / 10 m / 20 m / 30 m detachable cables |
| Connector | MIL-spec waterproof quick-disconnect |
| Probe Housing | Stainless steel protective sleeve |
| Battery Compartment | Independently sealed from electronics |
| Bend Endurance | ≥300,000 cable flex cycles |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | Pro20i |
| Instrument Type | Portable |
| Measurement Principle | Polarographic Electrochemical Probe |
| DO Range | 0–50 mg/L |
| Accuracy | ±0.2 mg/L (at 0–20 mg/L) |
| Temperature Range | −5 to 55 °C |
| Temp Accuracy | ±0.3 °C |
| Pressure Range | 53–133 kPa |
| Pressure Accuracy | ±0.4 kPa |
| Resolution (DO) | 0.01 or 0.1 mg/L (selectable) |
| Resolution (Temp) | 0.1 °C |
| Resolution (Pressure) | 0.01 kPa |
| Data Storage | 50 sets |
| IP Rating | IP67 |
| Drop Test | 1 m |
| Battery Life | 400 h (2 × C-cell alkaline) |
| Certifications | RoHS, CE, WEEE, IP67 |
| Brand | YSI |
|---|---|
| Origin | USA |
| Model | ProSolo |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based Optical Sensing |
| DO Range | 0–50 mg/L (0–500% air saturation) |
| DO Accuracy | ±0.1 mg/L |
| DO Repeatability | ≤±0.5% |
| Temperature Range | –5 to 70 °C |
| Temperature Accuracy | ±0.2 °C |
| Ingress Protection | IP67 |
| Battery Life | Up to 48 h (rechargeable Li-ion) |
| Data Storage | >100,000 readings |
| Calibration Records | 400 entries |
| Compliance | EPA-approved method for BOD testing |
| Cable Options | 1–100 m (standard: 4 m) |
| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Principle | Fluorescence Quenching at 470 nm excitation |
| Range | 0–20 mg/L (standard), 0–50 mg/L or 0–20,000 ppb (trace) |
| Accuracy | ±0.2 mg/L (0–20 mg/L) |
| Resolution | 0.01 mg/L or 1 ppb |
| Operating Temperature | −5 to 50 °C |
| IP Rating | IP68 |
| Submersion Depth | Up to 30 m |
| Compensation | Automatic temperature, barometric pressure, and salinity compensation |
| Output Interfaces | RS485 (Modbus RTU), 4–20 mA analog |
| Response Time (t₉₀) | ≤30 s |
| Fluorescent Cap Lifetime | 1–3 years |
| Drift | <1% per year |
| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Range | 0–20 mg/L DO / 0–200% saturation |
| Accuracy | ±0.1 mg/L (0–10 mg/L), ±0.2 mg/L (10–20 mg/L) |
| Temperature Compensation | 0–60 °C (automatic) |
| Response Time (t₉₀) | ≤60 s |
| Output Signals | 4–20 mA analog + RS485 digital (Modbus RTU) |
| Power Supply | AC 220 V ±10% or DC 24 V |
| Operating Environment | 0–50 °C, ≤90% RH (non-condensing) |
| Installation Options | Submersible, Flow-through, Pipe-mount |
| IP Rating | IP68 (sensor), IP65 (transmitter) |
| Brand | YST (Dalian Yist Instrument Co., Ltd.) |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Principle | Fluorescence Quenching (Pt-porphyrin sensor) |
| Excitation Wavelength | 470 nm |
| Emission Detection | Phase-shift analysis of red fluorescence |
| Range | 0–20 mg/L (0–20,000 ppb) |
| Accuracy | ±0.2 mg/L (0–20 mg/L), ±1 ppb + 2% (ppb range) |
| Resolution | 0.01 mg/L or 1 ppb |
| Response Time (t₉₀) | ≤30 s |
| Operating Temperature | −5 to 50 °C |
| IP Rating | IP68 |
| Submersible Depth | Up to 30 m |
| Compensation | Automatic temperature, atmospheric pressure, and salinity compensation |
| Output | RS485 (Modbus RTU), 4–20 mA analog |
| Sensor Lifetime | 1–3 years (fluorescent cap) |
| Drift | <1% per year |
| Calibration | Air-saturated water auto-calibration |
| Installation Options | Immersion, flow-through, buoy-mounted |
| Brand | YST |
|---|---|
| Origin | Liaoning, China |
| Model | YST809B-DO660 |
| Measurement Range | 0.00–20.00 mg/L DO |
| Accuracy | ±0.5% FS |
| Fluorescent Cap Lifetime | ≥12 months (typical operation) |
| Temperature Compensation | Automatic, 0–50 °C |
| Enclosure Rating | IP68 |
| Communication Interface | RS485 |
| Power Supply | AC 220 V or DC 12 V (solar-compatible) |
| User Interface | Chinese LCD, one-button calibration |