LG Electronics WS-2080 5.13 Calibration Mode

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5.13 Calibration Mode

In addition to the sea-level barometer calibration in the previous section, the following parameters can

also be calibrated:

• Indoor Temperature

• Outdoor Temperature

• Indoor Humidity

• Outdoor Humidity

• Wind Speed

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).

The temperature sensor utilizes a resistive thermal device (RTD), which varies the resistance as a

function of temperature. Due to manufacturing tolerances in resistance, the accuracy of the sensor is ±

2 °F. To improve on this accuracy, the indoor and outdoor temperature readings can be adjusted or

calibrated from the display console.

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 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, available from Ambient Weather.

Wind speed is the most sensitive to installation constraints. The rule of thumb for properly installing a

wind speed sensor is 4 x the distance of the tallest obstruction. For example, if your house is 20’ tall

and you mount the sensor on a 5’ pole: