The SkyVUE™PRO LIDAR ceilometer measures cloud height and vertical visibility for meteorological and aviation applications and is ideal for long-term research applications where a high level of detail is required.
Its robust construction is ideal for long-term installation, as it requires minimal maintenance and features a unique stratocumulus calibration procedure—allowing the ceilometer to be calibrated in the field.
The SkyVUE™PRO complies with CAA, WMO, and ICAO guidance and meets or exceeds all recommendations and specifications, including CAP437, CAP670, and CAP746.
With an operational reporting range of 10 km, the SkyVUE™PRO is easy to use yet boasts advanced signal processing and unique optical arrangements to provide superior resolution and performance.
The SkyVUE™PRO has many standard features, from a tilting base and two-axis inclinometer for automatic correction of cloud heights to heaters, blowers, and a sun filter for operation under all conditions—making deployments possible around the world.
Unique standard features include an easy-to-operate stratocumulus calibration, long-life back-up battery, and twin clocks to augment its many continuous diagnostic self-checks and provide assurance of continuous, reliable, and accurate performance.Read More
The SkyVUE™PRO LIDAR ceilometer measures cloud height and vertical visibility for meteorological and aviation applications or long-term research applications where a high level of detail is required. Using LIDAR (LIght Detection And Ranging) technology, the instrument transmits fast, low-power laser pulses into the atmosphere and detects backscattered returns from clouds and aerosols above the instrument.
A unique, efficient single-lens design increases optical signal-to-noise ratio and allows for larger optics in a compact package, improving accuracy and measurement performance. The optics are immune to damage from direct sunlight.
This approach, along with state-of-the-art electronics, provides a powerful and stable platform from which to measure cloud height and vertical visibility to high accuracy. The SkyVUE™PRO measures the atmosphere with high stability and repeatability, delivering excellent performance in even the harshest of conditions.
The SkyVUE™PRO provides information on cloud height, sky condition (up to five layers), vertical visibility, and raw backscatter profiles to a range of 10 km.
An automated Mixing Layer Height (MLH) option is available for air-quality applications. MLH is an important parameter in modelling air quality and air pollution episodes. The MLH is determined based on the operational algorithm used by KNMI, which detects the top of boundary layers.
The algorithm runs within the SkyVUE™PRO itself, and the results are incorporated in data messages, making it easy to incorporate the MLH into whatever systems are already in use without the need to run external special software. If you require the MLH option, please contact us.
The unique stratocumulus calibration capability, which allows users to calibrate measurements of scatter coefficients, uses a simple and user-friendly field method, giving complete confidence in the scatter profiles reported and removes the requirement to have the unit sent back for calibration.
Reliable range measurement is further assured by cross-checking two separate internal quartz clocks, eliminating the possibility of unidentified errors due to clock drift.
The SkyVUE™PRO can be tilted at various angles up to 24°. A small tilt is important, as it allows the ceilometer to resist high levels of reflection from large raindrops and frozen particles that can impair vertical-type sensors. The tilt also improves rain run-off on the ceilometer window, resulting in a much higher performance compared with vertical ceilometers.
Tilting to 24° also means that it can be operated anywhere in the world without the sun shining into the lens and resulting in missing data. An internal two-axis inclinometer provides automatic correction of cloud height at all angles, ensuring ease of installation and confidence that cloud heights are automatically corrected throughout the lifetime of the installation.
Software for data visualization and interpretation
Ceilometer data can be displayed using Campbell’s Viewpoint software or fed directly into existing data systems. The Campbell Viewpoint software will display the output from the ceilometer in a convenient and configurable form, including information on sky condition, mixing layers, and scatter profiles. All can be displayed simultaneously or separately with ranges and time scales. For more information on Viewpoint click here.
|Dimensions||100 x 32.7 x 28.1 cm (39.4 x 12.9 x 11.1 in.) including base|
|Shipping Dimensions||120 x 45.0 x 45.0 cm (47.2 x 17.7 x 17.7 in.)|
|Weight||32 kg (71 lb) without cables|
|Shipping Weight||58 kg (127.9 lb)|
|Reporting Range||0 to 10 km (0 to 33,000 ft)|
|Minimum Reporting Resolution||5 m (15 ft)|
|Hard Target Range Accuracy||±0.25%, ±4.6 m|
|Reporting Cycle||2 to 600 s|
|Cloud Layers Reported||Up to four layers|
|Sky Condition||Up to five layers with cover in oktas according to WMO requirements for SYNOP and METAR codes as standard|
|Vertical Visibility||Reported when no clouds selected|
|Laser Wavelength||912 nm (±5 nm)|
|Eye Safety Standard||Class 1M|
|Power||110, 115, 230 Vac ±10%, 50 to 60 Hz, 470 W maximum|
Internal 12 Vdc, 2 Ah battery backup
Provides 2 h measurement, without blower/heater, in the event of mains failure.
|Laser Safety Compliance||EN60825-1:2001|
|Electrical Safety Compliance||EN61010-1|
|Humidity Range||0 to 100% RH|
|Maximum Wind Speed||55 m/s (123 mph)|
|IP Rating||IP66 (NEMA 4x)|
Campbell Viewpoint is viewing software designed to accompany the Campbell Scientific optical sensor range, including the CS135 ceilometer, CS120A visibility and CS125 present weather sensors. It is free to download and use for 100 hours, after which you will need to purchase a key to continue using it. It is available with single or multiple sensor viewing options and also with data logging capability, please contact your Campbell Scientific office or representative for further information.
Campbell Scientific has introduced a new operating system, OS12 for the CS135 ceilometer. It is fully backwards compatible. OS12 is available free of charge.
OS12 has introduced improvements to the optical overlap correction function. This has corrected previous over-sensitivity to signal returns at very low altitudes.
This change results in the reduced detection of false, fixed-level, low cloud height reports during some types of rain and the reporting of cloud layers when there are returns from low lying layers of mist or pollution.
Number of FAQs related to SkyVUE™PRO: 7
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The CS135 has LED indicator lights that flash to indicate normal or fault statuses.
The output messages also contain information about Warnings and Alarms, known as the WA output. This is a single character with one of the following values:
W or A are output in the message strings when necessary.
The description of the warning or alarm is obtained from the fault Flag code at the end of each message.
Alarms are identified by the instrument if a self-test parameter goes beyond the range of a user-defined or manufacturer-defined setting.
Examples of manufacturer-defined settings include temperatures and circuit power. Alarms arise when a fault is identified that prevents measurements from being taken.
User-definable alarms include tilt-angle and lead-acid battery shut-down voltage. If the ceilometer senses that these are out of range, it will report alarms in the message string, as well as in the Alarm Flag section of each message.
Warnings are identified by the instrument when system parameters go beyond the optimum manufacturer-defined range, but where this does not prevent the operation of the sensor. An example of this is a temperature that is non-critically beyond its normal range.
Note: For some warnings, you might not be able to take corrective action yourself.
The cloud ceiling height relates to the height of the base of the cloud where the sky is overcast or has broken cloud cover.
In the unlikely event that a warning or an alarm is issued, the warning flag output indicates the nature of any fault.
Few warnings or alarms are actionable by the user—except, for example, the dirty photo-diode and Laser windows alarm. Other alarms may indicate a failure requiring work that cannot be performed by the user.
Cloud height is commonly used to refer to the height of the cloud base above ground level. (This is what the ceilometer reports.) However, it can also be used to refer to the thickness of a cloud, which is the difference in height between the base and very top of the cloud. It is possible for a ceilometer to estimate the thickness of thinner clouds. Occasionally, when reporting satellite data, it can also be used to refer to the height of the very top of a cloud above ground level.
At any one time, there may be several separate layers of cloud above a point on the ground. Each of these is a cloud layer, and each is given a cloud base height when it is detected by a ceilometer. The WMO (World Meteorological Organization) has set out rules that govern the minimum vertical separation that is required between layers before reporting more than one layer of cloud.
The cloud base is the lowest part of a cloud that passes overhead. It is typically measured with a ceilometer.
Some alarms, such as the tilt-angle and low-power battery shutdown voltages, are configurable. Most parameters are not configurable because they relate to the internal safe functioning of the ceilometer.