AWG 64 MB MEMORY CARD FOR WII Specifikace Strana 40

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TEAM Climate Monitoring Protocol 3.0
40
6.4.1 Temperature/RH sensor (Vaisala HMP45C)
The sensor head should be recalibrated every two years (the manufacturer recommends every
year, but keeping duplicate sensors calibrated annually is expensive). However, the first time this
is done, one sensor would need to be operational for two years while the duplicate is sent out for
calibration at the end of the first year. Afterwards, each sensor will be sent out for calibration at
the end of its second year of operation in an alternate schedule to keep two sensors operational at
all times (see Figure 13).
To replace the sensor head follow these steps (you will need to fill out the Sensor Calibration
Form Appendix A4):
Detach the sensor housing of the radiation shield from the top portion of the shield by loosing
the four clamps that retain the housing to the rest of the shield. Do not disconnect the sensor
cable or power cable coming from the shield.
Remove the sensor head: Unhook one of the temperature sensors and pull it out of the housing
without disconnecting the cables from the sensor to the cabling box. Once the sensor is out, pull
out the sensor head at the end. Write down the Serial Number of the sensor head in the
Sensor Calibration Form (Appendix A.4).
Replace the sensor head: Write down the serial number of the replacement sensor head in the
Sensor Calibration Form (Appendix A.4). Insert the replacement head into the probe (there is
only one way to do it).
Put back everything in place: Put the probe back in the radiation shield housing making sure
that the two sensor heads are not touching each other. Clamp back the sensor housing tube into
the fan housing section of the shield.
Send the sensor head out for calibration: Complete a Sensor Calibration Metadata Form
(Appendix A.5) for each sensor that is sent out for calibration. Obtain an RMA number from the
closest regional Campbell Scientific office and mail the sensor head out. When the sensor comes
back, fill the rest of the Sensor Calibration Metadata Form and keep the sensor as a duplicate.
Repeat the process above a year later when the other sensor in the pair will need to be
recalibrated.
Submit the information to the TEAM portal: Every time a sensor is sent out for calibration,
submit the information on the Sensor Calibration Form to the TEAM portal.
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