Compatible with most Campbell Scientific dataloggers
Overview
The CMP3, manufactured by Kipp & Zonen, is an ISO-second-class pyranometer that monitors solar radiation for the full solar spectrum range. It connects directly to a Campbell Scientific datalogger and is used for many meteorological applications.
Read MoreBenefits and Features
- Includes a white snap-on sun shield that reduces the sensor's temperature
- Measures reflected solar radiation when inverted
- Provides measurements in direct sunlight, under plant canopies, when the sky is cloudy, and in artificial light
- Includes bubble level and leveling screws, eliminating the need for a separate leveling base and simplifying installation
- Acceptable for providing the solar radiation data used in stability estimations
- Dome protects thermopile and allows water to roll off of it
- Designed for continuous indoor and outdoor use
Technical Description
The CMP3 measures solar radiation with a high-quality blackened thermopile protected by a dome. The blackened thermopile provides a flat spectral response for the full solar spectrum range, which allows the CMP3 to be used under plant canopies or lamps, when the sky is cloudy, and for reflected radiation measurements.
The CMP3 includes a white snap-on sun shield that reduces the sensor's temperature. It also has a bubble level and adjusting leveling screws, which enable the sensor to be leveled without using a leveling base.
The CMP3 produces a millivolt signal that is measured directly by a Campbell Scientific datalogger.
Two CMP3 pyranometers can be mounted back-to-back to make a low cost albedometer. Contact Campbell Scientific for more information.
Images
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | ||
| CR1000X (retired) | ||
| CR300 (retired) | ||
| CR3000 | ||
| CR310 | ||
| CR350 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
Mounting
The CMP3-L includes a bubble level and adjusting leveling screws, which allow the sensor to be leveled without using a leveling base. The CM225 Solar Sensor Mounting Stand is typically used to attach the sensor to a mast, crossarm, or pole (1.0 in. to 2.1 in. outer diameter). The CM225 consists of a rectangular plate, mounting bracket, U-bolts, washers, lock washers, and nuts. The CMP3-L should be mounted away from all obstructions or reflective surfaces that might adversely effect the measurement.
Alternatively, the CM245 Adjustable Angle Mounting Stand may be used. It includes slots that can be adjusted to any angle from horizontal to vertical.
Specifications
| Sensor | Blackened thermopile protected by a dome |
| Measurement Description | Monitors solar radiation for the full solar spectrum range |
| Spectral Range | 300 to 2800 nm |
| Maximum Irradiance | 2000 W/m2 |
| Sensitivity | 5 to 20 µV/W/m2 |
| Operating Temperature Range | -40° to +80°C |
| Temperature Dependence | ±5% (-10° to +40°C) |
| Non-Linearity | < ±2.5% (0 to 1000 W/m2) |
| Tilt Response | < ±2% at 1000 W/m2 (±80°) |
| ISO Classification | Class C (second class) |
| Dome Diameter | 3.2 cm (1.3 in.) |
| Width | 7.9 cm (3.1 in.) |
| Height | 6.7 cm (2.6 in.) |
| Weight | 600 g (1.2 lb) with 10 m (32.8 ft) cable |
Resources and Links
Manuals
FAQs for
Number of FAQs related to CMP3-L: 7
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If the dome becomes damaged, contact Campbell Scientific or Kipp & Zonen to discuss replacing the dome. The sensor will need to be sent to Kipp & Zonen for any repairs.
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This may be caused by conditions in which the dome of the sensor is warmer than the thermopile. Most users see a small negative value at night. This offset, as it is commonly termed, can be important for monitoring the performance of the sensor.
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The CMP3-L has a passive thermopile that produces a small analog voltage that can be equated to a representative amount of incident solar radiation. Campbell Scientific recommends connecting the leads of the CMP3-L to a Campbell Scientific data logger through a differential analog input terminal.
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No. The sensor needs to be connected to a data acquisition system, such as a Campbell Scientific data logger.
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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.
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The LP02-L is a sensor manufactured by Hukseflux, whereas the CMP3-L is manufactured by Kipp & Zonen. Both sensors meet the ISO classification of a Second Class pyranometer.
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To incorporate a sensor that is compatible with wireless sensor interfaces into a wireless network, a CWS900-series wireless sensor interface is needed, as well as an A205 CWS-to-PC interface to configure it.
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