在航空应用上, CS120A符合UK CAA，FAA和ICAO规范和参数要求（包括CAP437, CAP670 和 CAP746）
Compared to many such sensors, the CS120A design means that visibility is being measured in a relatively clean space because the position of the heads and body minimize disturbance of the airflow at the measurement volume.
The CS120A uses continuous high-speed sampling, which improves the accuracy of the measurements taken during mixed weather such as rain and hail, while providing reliable readings during more stable events such as fog and mist. High-speed sampling also allows the sensor to better respond to suddenly changing conditions.
The CS120A has several design features that keep its optics clean. Downward-facing optics minimize dirt and snow buildup. Low-powered heaters prevent the formation of dew, and a higher-powered heater prevents the formation of ice.
The sensor is very power efficient, drawing just 3 W during normal operation including the dew heaters; power can be reduced further by reducing the sample rate and manual control of the heaters.
Two configurable alarm outputs are provided and, via relays, these can drive external warning systems such as lights and foghorns. They can also be used to switch the intensity of wind turbine warning lights depending upon current visibility levels.
|Maximum Reported Visibility||75 km (46.6 mi)|
|Minimum Reported Visibility||5 m (16.4 ft)|
|Resolution||1 m (3.3 ft)|
|Mounting||Stainless-steel V-bolt bracket that attaches to a pole with a 32 to 52.5 mm (1.25 to 2 in.) outer diameter|
|Electronics Supply Voltage||7 to 30 Vdc|
|Total Unit Power||< 3 W while sampling continuously (including dew heaters)|
|Standards||Frangible masts are available to customer requirements to meet ICAO recommendations (typically placing the sample volume at 2.5 m [8.2 ft]).|
|Sensor Dimensions||540 x 640 x 246 mm (21.26 x 25.2 x 9.7 in.) including mount|
|Sensor Weight||~3 kg (6.6 lb) depending on mounting system|
|LED Center Wavelength||850 nm|
|LED Spectral Bandwidth||±35 nm|
|Light Pulse Rate||1 kHz|
|Operating Temperature Range||-25° to +60°C (standard)|
|Extended Operating Temperature Range||-40° to +70°C (This extended version is available as a special. Contact Campbell Scientific for more information.)|
|Operating Humidity Range||0 to 100%|
|Sensor Sealing||Rated to IP66|
|Wind Speed||Up to 60 m s-1|
|Sensor Heater Threshold||
DSP & Dew Heaters
|Power||2 x 0.6 W (total of 1.4 W) for dew heater|
|Typical Current Consumption @ 12 Vdc||
|Supply Voltage||24 V dc or ac|
|Power||2 x 30 W (total of 60 W)|
|Serial Interface||RS-232 or RS-485, 8 bit data bytes, 1 stop bit|
|Serial Data Rates||1200 to 115,200 bps (38,400 bps default rate)|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Campbell Scientific has introduced a new operating system, OS13, for the CS120A visibility sensor and CS125 present weather sensor. It is fully backwards compatible and is easily installed on all CS120A and CS125 sensors (but not older CS120 sensors). OS13 is available free of charge and can be downloaded here or supplied by email on request.
Upgrade to OS 13 is recommended.
Changes to both CS120A and CS125
To optimise user calibrations, OS13 temporarily disables hood heaters during calibration and resumes normal hood functionality once the calibration is complete.
Hood heaters now operate down to the fault alarm levels of -56°C, but will turn off at low temperatures if a thermistor fault is detected.
OS13 better flags DC saturation, which under very bright conditions might occasionally produce a dirty lens alarm.
OS13 has corrected the potential for level 1 dirty window alarms to occur during heavy fog and rain where visibility drops below 10m.
Changes to CS125 only
OS13 contains improved filtering to reduce the occurrence of short duration precipitation reports caused by transient insect activity. The sensor still retains its sensitivity to the detection of precipitation.
Automatic optimisation to differing background light levels reduce the occurrence of erroneous particles reported in bright light.
OS13 includes a software switch to turn off BCFG from the CS125 message output. If triggered by broken fog, the BCFG message could affect AWOS systems. This does not affect the CS120A.
Campbell Viewpoint is viewing software designed to accompany the Campbell Scientific optical sensor range, including the CS135 ceilometer, SkyVUE PRO, SkyVUE 8, SkyVUE 8M, CS120A visibility and CS125 present weather sensors. It is free to download (or via email on request) and use for 100 hours, after which you will need to purchase a key to continue using it.
Viewpoint version 220.127.116.11 has introduced our new ceilometer sensors to the list of instruments that can be monitored. This includes the SkyVue PRO, SkyVUE 8 and SkyVUE 8M.
Previous sensors are still available.
Version 18.104.22.168 also includes some minor bug fixes and improvements to the help menu.
不是每一种传感器都有不同的线缆尾端选项。通过查找传感器产品页面的订购栏 (Ordering tab) 中的两个位置，可以检查某种特定传感器的可用的线缆尾端选项：
如果传感器以 –ET, –ETM, –LC, –LQ, 或 –QD 等版本的型号供应，那么线缆尾端选项已经反映在该传感器的产品型号中。例如，034B 以 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, 和 034B-QD 等型号供应。
所有其它的线缆尾端选项，如果可用，会列在该传感器产品页面的订购栏 (Ordering tab) 中的线缆尾端选项 (“Cable Termination Options) 区域。例如，034B-L 风速风向传感器具有 –CWS, –PT, 和 –PW 等线缆尾端选项，显示在 034B-L 产品页面的 订购栏 (Ordering tab) 位置。
注： 当更新的产品添加到我们的库存中时，一般来说，我们会在单个传感器的产品型号下面列出多种线缆尾端选项，而不是创建多个产品型号。例如，HC2S3-L 具有 –C 线缆尾端选项用于连接到 CS110，而我们并没有使用 HC2S3-LC 产品型号。