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Diffraction Limited - Boltwood Cloud Sensor for Portable Use


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Manufactured by: Diffraction Limited

Diffraction Limited - Boltwood Cloud Sensor for Portable Use


The Portable Cloud Sensor is designed to alert you when the cloud conditions change. It consists of a sensor head and a control box, connected by a cable. The sensor head is placed outside, pointing up at an unobstructed sky. The control box can be conveniently located inside a tent or building, as needed. The control box includes batteries that will power the unit for over 100 hours, plus an alarm beeper, a headphone jack for "silent" alarms, and simple user controls.

The Portable Cloud Sensor measures the amount of cloud cover by comparing the temperature of the sky to the ambient ground level temperature. The sky temperature is determined by measuring the amount of radiation in the 8 to 14 micron infrared band. A large difference indicates clear skies, whereas a small difference indicates dense, low-level clouds. This allows the sensor to continuously monitor the clarity of the skies, and to alert the user when conditions change.

A built-in daylight sensor is also included. When the sensor is set to detect "Clear & Dark" conditions, it will alarm for clear skies unless the sun comes up first, in which case it lets you sleep in. When the sensor is set to detect "Cloudy or Light" conditions, it will alert you when clouds roll in or dawn approaches, so you can protect your telescope against the elements (including the sun!).

Although the Portable Cloud Sensor uses the same cloud detection technology as it's big cousin, the Boltwood Cloud Sensor II, it is not designed for permanent installations. It does not detect rain/moisture, wind, or humidity. The sensor is gently heated to prevent dew or frost, but it does not have the power to clear itself after a rain shower; it must be wiped off. It cannot connect to a computer or trigger an observatory dome closure. For permanent installations please use the Boltwood Cloud Sensor II.

Additional Information

Name Diffraction Limited - Boltwood Cloud Sensor for Portable Use
Manufacturer Diffraction Limited
Model BCS
Manufacturer Part No BCS