Bedienungsanleitung Alecto DKW-2012 (Seite 7 von 13) (Englisch)

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Many installations are not perfect and installing the weather station on a roof can be difficult. Thus, you

can calibrate for this error with a wind speed multiplier.

In addition to the installation challenges, wind cup bearings (moving parts) wear over time.

Without a calibrated source, wind speed can be difficult to measure. We recommend using a calibrated

wind meter and a constant speed, high speed fan.

Temperature Calibration

Temperature errors can occur when a sensor is placed too close to a heat source (such as a building

structure, the ground and when placed in direct sunlight without proper shielding in hot weather

environments).

To calibrate temperature, we recommend a mercury or red spirit (fluid) thermometer. Bi-metal (dial) and

other digital thermometers are not a good source and have their own margin of error. Using a local

weather station in your area is also a poor source due to changes in location, timing (airport weather

stations are only updated once per hour) and possible calibration errors (many official weather stations

are not properly installed and calibrated).

Place the sensor in a shaded, controlled environment next to the fluid thermometer, and allow the sensor

to stabilize for 48 hours. Compare this temperature to the fluid thermometer and adjust the console to

match the fluid thermometer.

Humidity Calibration

Humidity is a difficult parameter to measure accurately and drifts over time. Humidity errors can occur

when placed too close to the ground, near grass or other sources of humidity.

The hygrometer sensor utilizes a capacitor, which varies as a function of humidity. Due to manufacturing

tolerances, the accuracy of the sensor is ± 5%. To improve on this accuracy, the indoor and outdoor

humidity readings can be adjusted or calibrated from the display console.

To calibrate humidity, you will need an accurate source, such as a sling psychrometer or Humidipaks

One Step Calibration kit.

Rainfall calibration

The Rain Collector is calibrated at the factory so the bucket tips (and records rainfall) for each 0.01" (or

0.3 mm) of rain. To calibrate rainfall, we recommend a tube type rain gauge. Use a rain gauge with an

aperture of at least 4 inches. Any smaller and the readings obtained may not be accurate. Place the tube

type rain gauge directly next to the rain collector. Compare the totals on three storms. Based on this,

develop an average for how far off the readings are.

Do not compare rainfall readings to reading obtained from television, radio, newspapers, or neighbors’

readings. Such readings are not located in your specific environment and therefore are not an accurate

measurement of the weather readings taking place in your surroundings. The rain collector is carefully

tested at the factory to conform to the specifications listed in the back of this manual.

The history rainfall calibration factor is applied to the running total, not individual tips. All of the rainfall

figures are calculated from the total number of tips recorded by the station since it was reset. The total is

multiplied by 0.3 to get a total in mm. This is then converted to inches if necessary by multiplying by

0.0393700787. The calibration multiplier is then applied to this, and this is the figure that remembers and

compares each time a new total is read from the station.

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