Pegasus FlyAway Kit
38
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Columbia Weather Systems, Inc.
Enter the barometric pressure offset in 1/100 of in.Hg using the
BAR-OFFSET command.
Calibrating the Wind Sensors
The wind speed sensor contains no components that can be
calibrated by the user. Refer to the Installation Section for sensor
North orientation.
Calibrating the Temperature Sensors
All Temperature sensors are calibrated at the factory to a superior
grade ASTM mercury thermometer traceable to NIST. The
calibration offset is recorded on the temperature sensor and on the
end of the cable.
After initializing all the temperature sensors, enter the temperature
offsets using the TCAL command. Please refer to Section 4:
Operation for more information. TCal offsets are labeled on the
sensor cable.
To calibrate the temperature sensors on-site, perform the following
steps:
Prepare an ice bath by mixing two cups of crushed ice in two cups
of water. Use an insulated container for best results. Allow the
temperature throughout the ice bath to stabilize by waiting for about
twenty minutes.
Stir the ice bath to mix the ice and water, wait for the ice to separate
from the water, place the temperature sensor in the ice bath. Make
sure that the sensor is not in direct contact with ice.
Take a temperature reading from the Pegasus using SAMPLE or
POLL.
Calculate the temperature offset as follows:
Temperature offset = (32 - Pegasus reading) * 100
Enter the temperature offset using the TCAL command. Please refer
to Section 4: Operation for more information.
Record the temperature offset on a label attached to the sensor.
Repeat the process for any other temperature sensor.
