Ambient Weather Support

Temperature errors can occur when a sensor is placed too close to a heat source (such as a building structure, the ground or trees).

To calibrate temperature, we recommend a mercury or red spirit (fluid) thermometer. Here is an example:

https://www.amazon.com/dp/B00551N8Q2

Bi-metal (dial) and digital thermometers (from other weather stations) are not a good source and have their own margin of error. Using a local weather station in your area is 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).

1. Place the sensor in a shaded, controlled environment next to the red spirit thermometer, and allow the sensor to stabilize for 3 hours. We recommend bringing both sensors inside.  Compare this temperature to the red spirit thermometer and adjust the console to match the fluid thermometer.
2. Adjust the temperature from the console.  Note that the sensor will always read the non-calibrated or measured value.
3. While in the normal node, press and hold the SET/CH and BARO/- keys for five seconds to enter calibration mode (note: the SET/CH mode will appear after three seconds. Continue pressing the two keys until you see the CAL icon appear in the upper right hand corner of the display).
4. Enter the calibration offset to match the calibration source. Here is a detailed guide for all of the settings:

   

   Example:
   The calibrated temperature from a red spirit thermometer, or actual temperature is 60.0 °F.
   The uncalibrated or measured temperature is 58.7 °F.
   Offset = Calibrated Temperature – Uncalibrated Temperature = 60.0 – 58.7 = 1.3 °F.
   Enter the temperature offset +1.3 °F.