Operator`s manual

Installation, Operation and Maintainance of Buoy Operated Automatic Meteorological Stations

Sensors

Annex 3, which one is used for Wind Direction and use the “A” key to advance to this location.

Manually rotate the wind vane to its maximum location; this is where the value on the keyboard jumps back to zero.

Write down the maximum wind direction (e.g. 367 degrees). Adjust the multiplier in the Wind Direction Instruction

in BUOY_METSTAT by multiplying this value with 360 divided by the maximum wind direction. For this necessary

modification of BUOY_METSTAT, the reader is referred to the Campbell Scientific Operators Manual for the CR10X

Storage and Control Module.

3.2 Q-7.1-L REBS NET RADIOMETER

3.2.1 General

Q-7.1-L Net Radiometer is a high output thermopile sensor, which measures incoming short-wave and outgoing

long-wave solar radiation. Solar radiation is an important parameter for determining potential and actual evapora-

tion. It is used both in the Penman-Monteith and Priestley-Taylor approach. The incoming radiation consists of direct

and diffuse solar radiation plus long-wave irradiance from the sky on a horizontal surface. Out-going radiation con-

sists of reflected solar radiation plus the terrestrial long-wave component. The initial current output of this sensor

is transferred to voltage, which facilitates direct connection to the datalogger.

The technical specifications of this sensor are discussed in detail in the corresponding Campbell Scientific Instruc-

tion Manual for the Q-7.1-L Net Radiometer. The reader is referred to this text in case of need of more information.

3.2.2 Installation

Attach the supplied square mounting plate to the vertical pipe or rod of less than diameter 1.5 inches using the

larger two U-bolts (supplied). Attach the Radiometer support arm to the square mounting plate using the two

smaller U-bolts (supplied). Fasten the cable to the pipe with tape or plastic ties to prevent strain on the wires and

damage to the instrument. In the Northern hemisphere, install the Radiometer so that the sensor head is pointing

the South and vice versa.

Note: Ensure that the cable is tied to the support arm close to the ball joint and not hanging.

The Radiometer must be leveled. To level the instrument, bend the ball joint between the support arm and the

instrument using the 5/8 inches wrench on the hexagonal coupling nut on the instrument stem. An error will occur

in measurements if the sensor is not leveled.

Note: Do not bend the ball joint by holding the instrument head alone, as this may break the stem.

Attach the cable to the wiring panel of the CR10X logger according to the diagram in Annex 2, as follows:

- Black wire to terminal L5

- Clear wire to terminal G

- Jumper from AG to L5

- Red wire to terminal H5

- Jumper from L5 to AG