User manual

Capricorn 2000EX Weather Station 65
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Columbia Weather Systems, Inc.
SECTION 6: CALIBRATION
Calibrating the Barometric Pressure
Sensor
The barometric pressure sensor is calibrated at the factory to a highly
accurate digital pressure gauge (±0.02% of full range) and, therefore,
requires no further calibration.
Altitude Setting
After calibration at the factory, the altitude is set to zero. To get an
accurate barometric pressure reading, the local altitude needs to be set
in the weather station.
To set the altitude, use the ALT command and enter the altitude in feet.
Please refer to Section 4: Operation for more information. The altitude
can also be set using weather software or display console. Please refer
to the product user manual.
Note: The electronic transducer used to measure air pressure is
sensitive to changes in elevation of as little as 10 ft. (3 m).
Note: For systems with a MicroServer, the altitude setting should be
entered in the MicroServer/Parameter Settings
Optional Calibration Procedure
Even though the barometric pressure sensor is calibrated at the factory,
the sensor can be calibrated on-site. This might be required if the original
barometric pressure offset has been erased from memory, or if weather
station needs to match a local source.
To calibrate the barometric pressure on-site:
Using a terminal program set the barometric pressure offset to zero by
entering: 0 BAR-OFFSET
Wait approximately 5 seconds, then take a pressure reading using
SAMPLE, POLL or P1
Record the barometric pressure from a local reliable source at the same
elevation as the Capricorn 2000EX.
Calculate the barometric pressure offset as follows:
Barometric Pressure Offset = Source Reading - Capricorn 2000EX
Reading.