NR-LITE2-L Radiómetro de neta
Resistente a la intemperie
Absorbedores recubiertos de teflón en lugar de las frágiles cúpulas
meteorología aplicaciones agua aplicaciones energía aplicaciones gas flux & turbulence aplicaciones infraestructuras aplicaciones suelo aplicaciones

Resumen

El NR-LITE2 es un robusto radiómetro neto que mide el balance de energía entre la radiación solar incidente de onda corta y onda larga infrarroja con respecto la radiación solar correspondiente reflejada por la superficie. Se conecta directamente a nuestro datalogger Campbell Scientific. Se utiliza en aplicaciones relacionadas con la agricultura y hidrología.

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Ventajas y características

  • Compatible con la mayoría de dataloggers Campbell Scientific
  • Nivel de burbuja integrado que garantiza una correcta instalación
  • Incluye varillas que impiden a los pájaros asentarse en el radiómetro
  • Incluye absorbedores recubieros de teflón resistentes a la intemperie sin necesidad de utilizar las frágiles cúpulas de plástico

Imágenes

Descripción técnica

The NR-LITE2 includes two black conical absorbers—one facing upward and the other facing downward. The absorbers are coated in PTFE, making them resistant to weather without using a fragile plastic dome. Both absorbers are calibrated to an identical sensitivity coefficient.

The NR-LITE2 has a bubble level to ensure proper installation and a rod that deters birds from roosting on the sensor. It produces a millivolt signal that is measured directly by a Campbell Scientific datalogger.

Especificaciones

Sensor Description Blackened thermopile
Spectral Response 0.2 to 100 µm
Response Time 20 s (nominal) e-1
Sensitivity 10 µV W-1 m2 (nominal)
Output Range ±25 mV
Measurement Range ±2000 W m-2
Operating Temperature Range -30° to +70°C
Sensor Diameter 8.0 cm (3.1 in.)
Support Arm Diameter 1.6 cm (0.6 in.)
Support Arm Length 80 cm (31.5 in.)
Sensor Weight 200 g (7.0 oz)
Support Arm Weight 635 g (23 oz)

Compatibilidad

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000
CR200X (retired)
CR800
CR850

Miscellaneous

Product Compatible Note
21X (retired)
CR10 (retired)
CR10X (retired)
CR216X (retired)
CR23X (retired)
CR3000
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR9000 (retired)
CR9000X

Información de compatibilidad adicional

Mounting

To avoid shading/reflections and to promote spatial averaging, the NR-LITE2 should be mounted at least 1.5 m above the ground or crop canopy and away from all obstructions or reflective surfaces that might adversely affect the measurement. Campbell Scientific recommends mounting the NR-LITE2 to a separate vertical pipe at least 25 ft away from other mounting structures. The 26120 Net Radiation Sensor Mounting Kit is used to mount the NR-LITE2 to a vertical pole or a horizontal crossarm, such as the CM202, CM203, CM204, or CM206.

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Preguntas frecuentes

Número de FAQs relacionadas con NR-LITE2-L: 12

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  1. Yes, as long as the correct AWG for the cable is used. In addition, the extension point should be water tight. The total cable length should not exceed 100 ft because signal dissipation can become too great along the cable.

  2. The net radiation measurement must be scaled to give total megajoules per square meter (MJ/m2) received during the period between calling the output table with the ETsz() instruction in it. (This is normally the scan interval.) If the sensor is scaled to output flux, the value needs to be converted to megajoules. For example, if the output flux unit is W/m2, multiply the flux value by the scan interval (in seconds) and by 10-6 to convert the value to megajoules (that is, MJ = W x scan x 10-6).

  3. The calibration of the NR-LITE2-L is carried out at zero wind speed. At any other wind speed, the sensitivity will decrease. It has been shown that this decrease in sensitivity is less than 1% of reading per m/s wind speed, and the effect is essentially independent of the radiation level. More information about this can be found in the "Sensitivity to Wind Speed" subsection in the "Overview" section of the instruction manual.

  4. As of June 2013, all of our current and retired net radiation sensors can be mounted using this kit. These include:

    • Current sensors: CNR4-L, NR-LITE2-L, and NR01-L
    • Retired sensors: CNR1, CNR1-L, CNR2-L, NR-LITE-L, and Q7.1-L
  5. Albedo is the fraction of solar energy (short-wave radiation) reflected from the Earth back into space. It is a measure of the reflectivity of the surface of the earth. Because this sensor does not produce separate components of the long-wave and short-wave radiation, it is impossible to properly calculate the albedo.

  6. Mount the net radiometer so that no shadow will be cast on it at any time of day from obstructions such as trees, buildings, the mast, or the structure on which it is mounted.

    Campbell Scientific recommends installing a net radiometer in an open area, away from the main weather station structure on a separate vertical mast. If it is necessary to install this sensor on the main tall tower (30 ft or taller), the sensor should be installed at the top of the tower. In the northern hemisphere, the sensor should be facing south. In the southern hemisphere, the sensor should be facing north. If the tower uses a solar power system (that is, solar panels), ensure that the solar panels are installed away from the main tower.

  7. Because of the loss of IR radiation, nearly all thermopile instruments typically have a negative offset. This offset is most easily visible at night-time, when a small negative value is read instead of zero. This same offset is present during the daytime, but it is not as visible because of the large solar signal.

    Another common issue involves leveling an instrument. Leveling a thermopile instrument can cause errors in the direct beam component because the cosine response is not correct. These errors are more notable when the sun is close to the horizon because the angle is so shallow.

  8. The information included on a calibration sheet differs with each sensor. For some sensors, the sheet contains coefficients necessary to program a datalogger. For other sensors, the calibration sheet is a pass/fail report.

  9. Not every sensor has different cable termination options. The options available for a particular sensor can be checked by looking in two places in the Ordering information area of the sensor product page:

    • Model number
    • Cable Termination Options list

    If a sensor is offered in an –ET, –ETM, –LC, –LQ, or –QD version, that option’s availability is reflected in the sensor model number. For example, the 034B is offered as the 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, and 034B-QD.

    All of the other cable termination options, if available, are listed on the Ordering information area of the sensor product page under “Cable Termination Options.” For example, the 034B-L Wind Set is offered with the –CWS, –PT, and –PW options, as shown in the Ordering information area of the 034B-L product page.

    Note: As newer products are added to our inventory, typically, we will list multiple cable termination options under a single sensor model rather than creating multiple model numbers. For example, the HC2S3-L has a –C cable termination option for connecting it to a CS110 instead of offering an HC2S3-LC model. 

  10. Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:

    • An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
    • An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.

    If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.

    If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.

    • –ET models terminate with the connector for an ET107 weather station.
    • –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
    • –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
    • –PW models terminate with the connector for a PWENC or pre-wired system.

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