Specifications

54
TEAM Climate Monitoring Protocol 3.1
6.5 Sensor Calibration
The sensors need to be calibrated periodically to ensure that the measurements are consistent through
time. Having duplicate sensors facilitates this process and ensures there is always a backup in case
one of the sensors fails. While a sensor is out for calibration, a replacement sensor needs to be
installed in its place (just the head for the Temperature/RH sensor). A summary of the calibration
schedule can be found in Table 6 below. Sensor calibrations will be recorded in the
Sensor
Installation/Calibration Form
(Appendix A.4). For each sensor calibrated also please complete the
Sensor Calibration Metadata Form (Appendix A.5). This form keeps track of vendors, costs and
calibration certificates for each of the sensors used. All sensor calibration events will be scheduled
automatically in the TEAM online Sampling Scheduler before the start of each data collection year.
Both of these forms must be uploaded to the TEAM Network portal following the instructions included
in Section 6.5.4.
SSeennssoorr
CCaalliibbrraattiioonn pprroocceessss
FFrreeqquueennccyy
Temperature/RH Vaisala
HMP45C
Sent to manufacturer for calibration.
Fill in information on the
Sensor Calibration Form
Submit information to the TEAM portal
Yearly
Precipitation (TB4) Level and pour 314 cc of water. Gauge should tip 39
times. If not send out for calibration
Fill in information on the
Sensor Calibration Form
Submit information to the TEAM portal
Yearly
Solar Radiation (LI 200X) Sent to manufacturer for calibration.
Fill in information on the
Sensor Calibration Form
Submit information to the TEAM portal
Every two
years
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6.5.1 Temperature/RH sensor (Vaisala HMP45C)
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:
 Pen/Pencil
 Replacement Temperature/RH sensor
 Blank
Sensor Installation/Calibration Form
 Blank
Sensor Calibration Metadata Form
The sensor head should be recalibrated every year. Figure 24 on the following page illustrates how the
replacement and recalibration schedule should work. Note that there is a lag the first year the sensors
are installed. Sensor 1 is removed after a year of operation, but since two sensors need to be running
at a time, Sensor 2 is not removed until a
a
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Sensor 1 is recalibrated and returned to the field. Follow
the steps below for removing and replacing sensors. Use a
Sensor Installation/Calibration Form
(Appendix A.4. Sensor Installation/Calibration Form) to record the event.
1. D
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Unhook the bottom portion of the
radiation shield from the top by loosening 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.