Turbidez / OBS-3+
RETIRED ›
This product is not available for new orders. We recommend ordering: ClariVUE10.
OBS-3+ Sensor de turbidez
Services Available
Repair No
Free Support Yes

Resumen

La OBS-3+ es una sonda sumergible con ópticas laterales 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 más

Ventajas y características

  • Las ópticas laterales evitan las obstrucciones encima y debajo 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) )
  • Precisa y robusta
  • 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
  • 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 OBS-3+ uses its sideways-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 sideways-facing optics avoids obstructions above and below the probe. The OBS300 is available for locations that have obstructions around the sides of the probe.

OBS® is a registered trademark of Campbell Scientific.

Preguntas frecuentes

Número de FAQs relacionadas con OBS-3+: 28

Expandir todoDesplegar todo

  1. What is the difference between the backscatter measurement of the OBS-3+ and the side-scatter measurement of the ClariVue™10 sensor?

    The most significant difference between backscatter and side-scatter measurements is the sample volume. A backscatter sensor has a much larger sample volume that helps measure higher turbidity values. The smaller sample volume of side-scatter sensors works better at lower turbidities.

  2. Does it matter how sediment calibration standards are prepared?

    Read this application note to learn more about the effect of drying and grinding sediment for calibration.

  3. Is fouling of OBS sensors something to be concerned about?

    This application note contains information regarding biological and chemical fouling.

  4. What light sources and detectors are used in OBS sensors?

    This application note provides a description of infrared-emitting diodes, laser diodes, photodiodes, daylight filters, and operating spectra.

  5. Does water color affect OBS measurements?

    The application note includes results of tests on dissolved organic and inorganic NIR-absorbing substances in the environment.

  6. What are the differences between the different turbidity units used, such as NTU, FBU, FTU, and FNU?

    It used to be that NTUs were the unit for all turbidity sensors. In 2007, an ASTM committee formed and established different units for each category of turbidity sensor technology, and there are many. Backscatter sensors such as the OBS-3+ and the OBS501 have units of FBU (Formazin Backscatter Units), whereas ISO 7027 side-scatter sensors have units of FNU (Formazin Nephelometric Units). The side-scatter OBS501 and the ClariVue™ sensors are part of this category. While sensors of different technical designs can be calibrated and measure Formazin the same, they will not make the same measurement in natural waters where size, shape, color, reflectivity, etc., of the particles vary. The ClariVue™ sensor measurements will not match the OBS-3+ measurements in natural waters.

  7. How does sediment concentration affect an OBS sensor?

    This application note shows sample calibrations for sand, silt, and clay.

  8. How do OBS and other optical sensors measure turbidity and suspended solids?

    This application note provides general information about sediment sensors, light sources and detectors, optical designs, applications, and turbidity standards.

  9. Can NTUs be directly converted to SSC?

    Read this application note to learn about SSC turbidity relationships.

  10. How big are the effects of sediment color on OBS measurements?

    This application note includes information on sediment color and NIR reflectivity.

Visite la librería de FAQ

Compatibilidad

Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.

Dataloggers

Producto Compatible Nota
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR216X (retired)
CR23X (retired)
CR300 (retired)
CR3000 (retired)
CR310
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Especificaciones

Range
  • 0 to 250 NTU
  • 0 to 500 NTU
  • 0 to 1000 NTU
  • 0 to 3000 NTU
  • 0 to 4000 NTU
Maximum Submersion Depth
  • 500 m (1640.5 ft) for stainless-steel body
  • 1500 m (4921.5 ft ) for titanium body
Concentration Accuracy
  • 2% of reading or 1 mg/l (whichever is larger) for mud
  • 4% of reading or 10 mg/l (whichever is larger) for sand
Maximum Concentration Range
  • Maximum concentration depends on sediment size, particle shape, and reflectivity.
  • 5,000 to 10,000 mg/l (for mud)
  • 50,000 to 100,000 mg/l (for sand)
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 14.7 cm (5.79 in.)
Weight 181.4 g (0.4 lb)

-2.5 Output Option
Output Voltage 0 to 2.5 V (over selected NTU range)
Supply Voltage 5 to 15 Vdc
Current Drain 15 mA

-5 Output Option
Output Voltage 0 to 5 V (over selected NTU range)
Supply Voltage 5 to 15 Vdc
Current Drain 15 mA

-20 Output Option
Output Voltage 4 to 20 mA (over selected NTU range)
Supply Voltage 9 to 15 Vdc
Current Drain 45 mA

Artículos y notas de prensa