Campbell NL100 Manual do Utilizador descarregar pdf (Página 11)

November 2005, ARM-TR-069

B-1

SURTHREF

Six-Month Calibration Procedures

Frequency: Twice a year

Mentor: Michael Ritsche, Barry Lesht

To verify the accuracy and installation of the six temperature and RH probes the following will

need to be accomplished:

Remove the humidity cap from each of the sensors and clean or replace. The Vaisala probe

humidity cap is replaced on a similar time frame to the SMOS replacement. The Rotronic

humidity cap is made of wire mesh. This cap should be gently cleaned using a mild detergent and

soft bristled brush. It will need to dry thoroughly before re-installation. If major damage has

occurred, the humidity cap should be replaced.

Verification of the sensors is done with the Vaisala HMI31/HMP35 temperature and RH meter.

Set or hold the measuring portion of the meter inside the polypropylene aspirated chamber.

Ensure that the meter is centered and at similar height to the measuring portion of the six probes.

Turn on the meter and allow it to stabilize so that the meter readings are changing by less than

0.2°C and 1% RH. When the meter has stabilized, wait an additional five minutes before taking

readings. The readings from the sensors are available inside the sonde trailer and are located on

the PC in the program called BBSSRef.RTMC.

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Campbell NL100 Manual do Utilizador Página 11