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| Brand | In-situ Marine |
|---|---|
| Origin | Australia |
| Model | IMO-NTU |
| Product Type | Portable Submersible Turbidimeter |
| Measurement Range | 0–400 NTU (factory-customizable) |
| Resolution | 0.05 NTU |
| Operating Temperature | 0–40 °C |
| Accuracy | ±0.05 NTU |
| Scattering Angle | 120° |
| Detector | Silicon Photodiode |
| Light Source | 890 nm LED |
| Calibration Standard | Formazin (NTU) |
| ADC Resolution | 16-bit |
| Max Sampling Rate | 10 Hz |
| Ambient Light Rejection | Yes |
| Communication Protocol | RS-232 @ 19200 bps |
| NMEA-Style Output | Yes |
| Supply Voltage | 7–24 VDC |
| Current Draw | 15 mA (sampling), 150 mA (cleaning) |
| Analog Output | 0–5 VDC |
| Connector | MCBH6M |
| Length | 148 mm (plus 36 mm connector protrusion) |
| Diameter | 67 mm |
| Weight (air) | 650 g |
| Weight (water) | 150 g |
| Housing Material | Acetal |
| Brush & Panel Material | Copper |
| Maximum Depth Rating | 300 m |
| Brand | In-situ Marine |
|---|---|
| Origin | Australia |
| Model | IMO-NTU-LPT |
| Type | Portable Submersible Turbidimeter |
| Measurement Range | 0–400 NTU (factory-customizable) |
| Resolution | 0.05 NTU |
| Scattering Angle | 120° |
| Light Source | 890 nm LED |
| Detector | Silicon Photodiode |
| ADC | 16-bit |
| Max Sampling Rate | 10 Hz |
| Environmental Light Rejection | Yes |
| Communication | RS-232 (configurable baud rate) |
| Power Input | 7–24 VDC |
| Operating Current | 40 mA (sampling), 250 mA (cleaning), 60 µA (sleep) |
| Internal Battery | 11.1 V, 5.2 Ah Li-ion (rechargeable) |
| Housing Material | Acetal |
| Depth Rating | 300 m |
| Operating Temperature | −10 to +40 °C |
| Dimensions | 285 mm (L, including 36 mm connector), 67 mm (diameter) |
| Weight | 1.4 kg (air), 0.3 kg (water) |
| Data Storage | 16 GB microSD card |
| Built-in Sensors | Pressure, Temperature, Real-time Clock, Tilt Sensor |
| Self-cleaning Mechanism | Integrated copper-brush wiper |
| Brand | Wetlabs |
|---|---|
| Origin | USA |
| Model | ECO-NTU |
| Type | Submersible Online Turbidimeter |
| Measurement Ranges | 0–70 NTU, 0–200 NTU, or 0–1000 µg/L (selectable) |
| Resolution | 0.01 NTU |
| Accuracy | ±0.01 NTU |
| Wavelength | 700 nm |
| Housing Material | Polyoxymethylene (POM), seawater-corrosion-resistant |
| Dimensions | Ø63 × 127 mm |
| Weight | 0.4 kg (air), 0.02 kg (water) |
| Depth Rating | Standard 600 m, optional 6000 m |
| Output | RS-232 (19200 baud), 0–5 V analog |
| Digital Resolution | 12-bit |
| Sampling Rate | 8 Hz |
| Internal Data Logging | Optional, up to 65,000 samples |
| Power Input | 7–15 VDC |
| Current Draw | 80 mA (active), 85 µA (sleep mode) |
| Connector | SUB-CONN Micro 5-pin male |
| Optional Features | Internal Li-ion battery, anti-fouling copper brush (programmable cycle), biofouling guard, handheld terminal interface |
| Brand | AQUALABO |
|---|---|
| Origin | France |
| Model | NTU |
| Type | Online Turbidity Sensor |
| Measurement Range | 0–4000 NTU |
| Resolution | 0.01 NTU |
| Accuracy | ±5% of reading |
| Operating Temperature | 0–50 °C |
| Output Protocols | Modbus RTU over RS-485 (standard), SDI-12 (optional) |
| Enclosure Rating | IP68 |
| Power Supply | 5–12 V DC |
| Typical Current Consumption | 820 µA (RS-485, 1 Hz), 4.2 mA (SDI-12, 1 Hz) |
| Dimensions | Ø27 mm × 170 mm (sensor + 3 m cable) |
| Weight | 300 g |
| Pressure Rating | 5 bar |
| Optical Principle | 90° infrared scattered light nephelometry at 850 nm |
| Calibration Standard | Formalin-based turbidity standards per NF EN 872 (0–500 mg/L) and NF T 90-105-2 (>500 mg/L) |
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