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CS215-L Sonda temperatura y humedad relativa del aire
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Resumen

El sensor de temperatura y humedad relativa CS215 utiliza un elemento sensor digital hecho en Suiza que proporciona medidas precisas y estables. El elemento sensor está basado en tecnología de Sensirion's CMOSens, que ha sido verificado durante más de dos años en condiciones alpinas. La salida de señal del CS215 es digital con protocolo SDI-12, compatible con la mayoría de nuestros dataloggers Campbell Scientific dataloggers.

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Ventajas y características

  • Medidas precisas y estables
  • Elemento reemplazable en campo que permite recalibración en el lugar
  • Cada elemento sensor es calibrado individualmente y por tanto la sonda no requiere ajustes posteriores
  • Bajo consumo
  • Salida digital SDI-12
  • Amplio rango temperatura funcionamiento

Imágenes

Descripción detallada

La sonda CS215 usa el elemento sensor Sensirion SHT75, que incluye la medida precisa y estable de la temperatura y humedad relativa del aire. El elemento Sensirion SHT75 se puede re-emplazar en campo, lo que evita tener que mandar a fábrica la sonda completa para su recalibración. La salida de señal de la CS215 es SDI-12, que la mayoría de nuestros dataloggers Campbell Scientific puede medir.

Es necesario utilizar siempre un protector de radiación que puede fijarse en un mástil o poste vertical.

Especificaciones

Sensing Element Sensirion SHT75
Measurement Description Temperature, relative humidity
Signal Type/Output SDI-12
Communication Standard SDI-12 V1.3 (responds to a subset of commands)
Housing Material Anodized aluminum
Housing Classification IP65 (NEMA 4)
Sensor Protection Outer glass-filled polypropylene cap. Inner expanded PTFE filter. Filter material has a porosity of 64% and a pore size of < 3μm.
Supply Voltage
  • The supply voltage is typically powered by the data logger's 12 V supply.
  • 7 to 28 Vdc (for serial numbers E13405 and newer)
  • 6 to 18 Vdc (for older models)
Typical Current Drain
  • 120 μA (quiescent)
  • 1.7 mA (measurement takes 0.7 s)
EMC Compliance Tested and conforms to IEC61326:2002.
Operating Temperature Range -40° to +70°C
Field Replaceable Chip or Recalibrate Field-replaceable chip
Diameter
  • 1.2 cm (0.5 in.) at sensor tip
  • 1.8 cm (0.7 in.) at cable end
Length 18.0 cm (7.1 in.) including strain relief
Weight 150 g (5.3 oz) with 3.05 m (10 ft) cable

Relative Humidity

Measurement Range 0 to 100% RH (-20° to +60°C)
Output Resolution 0.03% RH
Accuracy
  • ±2% (10% to 90% range) at 25°C
  • ±4% (0% to 100% range) at 25°C
Short-Term Hysteresis < 1% RH
Temperature Dependence Better than ±2% (-20° to +60°C)
Typical Stability ±1.0% per year
Response Time with Filter < 20 s (63% response time in still air)
Calibration Traceability NIST and NPL standards

Air Temperature

Measurement Range -40° to +70°C
Output Resolution 0.01°C
Accuracy
  • ±0.3°C (at 25°C)
  • ±0.4°C (5° to 40°C)
  • ±0.9°C (-40° to +70°C)
Response Time with Filter < 120 s (63% response time in air moving at 1 m s-1)

Compatibilidad

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

Dataloggers

Producto Compatible Nota
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000X
CR200X (retired)
CR216X (retired)
CR300
CR3000 (retired)
CR3000 (retired)
CR310
CR5000 (retired)
CR6
CR800
CR850
CR9000X (retired)

Miscelaneo

Producto Compatible Nota
21X (retired)
CR10 (retired)
CR10X (retired)
CR23X (retired)
CR500 (retired)
CR510 (retired)
CR9000 (retired)

Información de compatibilidad adicional

Sensor Mounts

When exposed to sunlight, the CS215 must be housed in a 41303-5A radiation shield. To attach the 41303-5A to a CM202, CM204, or CM206 crossarm, place the 41303-5A’s U-bolt in the bottom holes. To attach the radiation shield directly to a tripod mast, tower mast, or tower leg, place the U-bolt in the side holes.

The CS215-L Temperature and RH sensor can also be housed in the 43502 if a special adapter from R. M. Young (R. M. Young pn 43537) is used.

Preguntas frecuentes

Número de FAQs relacionadas con CS215-L: 14

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  1. Relative humidity (RH) from the probe is capped at 100%. If readings of 100% occur during drier conditions, it is possible that the chip, the entire sensor, or both have associated issues. Repair, maintenance, or replacement is likely needed. Contact Campbell Scientific for assistance.

  2. Refer to the “Maintenance and Calibration” section of the instruction manual.

  3. If the values are not within the published range of the sensor, there are several things to check:

    1. If the yellow cap has not already been removed, remove it.
    2. Verify that the program is correct without additional multipliers or offsets.
    3. Ensure that the filter and radiation shield are clean so that air can freely flow into and past the sensor.
    4. If the first value returned in the array is NAN, this is usually an indication that the data logger is unable to communicate with the sensor. This could be caused by a power issue, an incorrect SDI-12 address, one or more disconnected wires, or a broken sensor. 
  4. Yes, using pn 18144Replacement RH and Temperature Element and Filter Cap for CS215. However, Campbell Scientific recommends taking the necessary precautions associated with changing electronics in the field. As this is a relatively small chip, it is not recommended to replace the chip during stormy weather or without having some type of collection container placed underneath in case the chip is accidentally dropped.

    For assistance replacing the chip, refer to the “Maintenance and Calibration” section of the instruction manual.

  5. If the -100 is actually -99.999 for both temperature and RH, this is an indication of what should be a rare condition. This indicates that the microprocessor in the body of the probe cannot communicate with the sensor element correctly. To be more specific, the communication between the microprocessor and the sensor element includes a CRC check. The microprocessor tries up to three times to get data with a good CRC. If it does not succeed, its sets both values to -99.999.

    The following are some reasons why this might happen, as well as some suggested solutions:

    • There is a source of very strong RF interference near the tip of the probe. Check that the probe is not mounted close to a cellular telephone or radios.
    • The sensor element does not have a good connection with its socket, or the socket is corroded. Remove the cap of the sensor, and inspect or reseat the sensor element.
    • The sensor element is faulty. A replacement element can be ordered from the Sensirion website.
    • There is an internal connection issue or dry solder joint inside the sensor body. In 2011, some sealing glue ran down inside the probe’s body into a connector, which caused a poor, intermittent connection. Measures were taken to prevent this from happening in CS215-L sensors produced later.
  6. No. The sensor cannot be calibrated, but Campbell Scientific can perform a calibration verification that includes multiple points (temperature and relative humidity). Campbell Scientific recommends using three points for RH (10%, 50%, and 90%) at one temperature (25 degrees Celsius), as well as an additional temperature point. This verification process has an initial setup charge and an additional per-point charge. Campbell Scientific sends a document indicating the values tested to with the accompanying measurement from the associated sensor.

  7. Yes. This can be purchased from Campbell Scientific (pn 18144, Replacement RH and Temperature Element and Filter Cap for CS215). This chip replaces both the temperature and RH humidity sensing element.

  8. The most significant difference is that the CS215-L has an SDI-12 output and that the HMP60-L has a voltage output. Additional differences are outlined in the “Air Temperature & Relative Humidity” brochure, which compares all of the Campbell Scientific temperature and relative humidity sensors. 

  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. 

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