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Resumen
La OBS300 es una sonda sumergible con ópticas enfocadas hacia abajo para medir la turbidez. Utiliza la tecnología OBS® para medir los sólidos en suspensión y turbidez, en aplicaciones que van desde monitorización de la calidad de agua en ríos y riachuelos hasta el transporte de sedimentos y dragados. Los dataloggers Campbell Scientific miden la salida de la sonda y calculan la turbidez.
Leer másVentajas y características
- Con las ópticas enfocadas hacia abajo se evitan las obstrucciones por los lados de la sonda
- Mide sólidos suspendidos y turbidez hasta 4000 NTU
- Sonda compacta, de bajo consumo
- Compatible con todos los datalogger Campbell Scientific (incluso serie CR200(X) )
- Cuerpo de acero inoxidable que permite su uso hasta 500m de profundidad en agua natural
- El cuerpo de titanio permite su uso hasta 1500m de profundidad en agua natural o marina
- Precisa y robusta
- Incluye conector sumergible MCBH-5-FS—disponibles variedad de longitud de cable
- Disponible opcionalmente calibración sedimento en cinco puntos para mejorar la medida
Imágenes
Descripción detallada
The OBS300 uses its downward-facing optics to emit a near-infrared light into the water. It then measures the light that bounces back from the water’s suspended particles.
If an obstruction is in the emitted light’s range, the light will scatter back and the turbidity reading will be too high. This probe's downward-facing optics avoid obstructions around the sides of the probe. The OBS-3+ is available for locations that have obstructions above and below the probe. (OBS® is a registered trademark of Campbell Scientific.)
Especificaciones
| Range |
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| Maximum Submersion Depth |
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| Maximum Concentration Range |
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| Concentration Accuracy |
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| Operating Temperature Range | 0° to 40°C |
| Drift over Time | < 2% per year |
| Maximum Data Rate | 10 Hz |
| Minimum Warm-up Time | 2 s |
| Infrared Wavelength | 850 nm ±5 nm |
| Daylight Rejection | -28 dB (re: 48 mW/cm-2) |
| Optical Power | 2000 µW |
| Turbidity Accuracy | 2% of reading or 0.5 NTU (whichever is larger) |
| Housing Material | 316 stainless steel or titanium |
| Connector | MCBH-5-FS, wet-pluggable |
| Diameter | 2.5 cm (0.98 in.) |
| Height | 13.1 cm (5.15 in.) |
| Weight | 181.4 g (0.4 lb) |
-2.5 Output Option |
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| Output Voltage | 0 to 2.5 V (over selected NTU range) |
| Supply Voltage | 5 to 15 Vdc |
| Current Drain | 15 mA |
-5 Output Option |
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| Output Voltage | 0 to 5 V (over selected NTU range) |
| Supply Voltage | 5 to 15 Vdc |
| Current Drain | 15 mA |
-20 Output Option |
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| Output Voltage | 4 to 20 mA (over selected NTU range) |
| Supply Voltage | 9 to 15 Vdc |
| Current Drain | 45 mA |
Compatibilidad
Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.
Documentos
Folletos producto
Documentos técnicos
- OBS and Turbidity Sensors Basics (2Q-P)
- OBS: Effects of Light Absorption and Scattering in Water Samples on Measurements
- OBS Sensors: Light Sources and Photodetectors
- OBS: Effects of Suspended Solids Concentration (SSC)
- OBS Measurements: Effects of Sediment Size
- OBS Measurements: Effects of Sediment Color
- OBS Measurements: Effects of Water Color
- OBS: Effects of Bubbles
- OBS Sensor: Effects of Fouling on the Lens
- OBS Sensors: Sediment Calibration
- OBS Sensors: Turbidity Calibration
- OBS: Comparison of Suspended Solids Concentration (SSC) and Turbidity
Preguntas frecuentes
Número de FAQs relacionadas con OBS300: 13
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Typically, users use a clamp (a hose clamp, for example) to fasten the sensor to a permanent structure in the water so that the optics are orientated toward the open water.
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Yes. The OBS300 is not harmed by being dry. The optics, however, need to be cleaned of any dust or contamination before the measurements are resumed.
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Sensors are calibrated at the factory for measurements up to 4,000 NTUs, if requested at the time of order. Sensor ranges cannot be adjusted outside the factory.
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The beam divergence angle of the sensor is 42°. (Within this 42° cone, 95% of the beam power is contained.)
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The following are some suggestions:
- Keep the optics clean.
- Site-specific field calibration may be necessary for the best performance.
- Prevent the sensor from freezing.
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The OBS-3+ and the OBS300 are essentially the same sensor but with differing optic placement. The OBS-3+ has sideways-facing optics, whereas the OBS300 has downward-facing optics.
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The OBS-3+ or OBS300 provides two separate outputs to match the two turbidity ranges selected at the time of purchase. Use the curve that matches the turbidity range likely to be experienced during monitoring. Program the datalogger to record and store data from each output, or choose which output to use automatically depending on the turbidity.
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The accuracy is 0.5 NTU or 2% of reading.
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No. A datalogger is necessary.
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This has not been tested; however, it is likely that, as the sensor moves through the water, disturbances or bubbles are created that could distort the turbidity measurements.