Campbell HFP01SC Manual do Utilizador descarregar pdf (Página 8)

Model HFP01SC Self-Calibrating Soil Heat Flux Plate

TABLE 2. Datalogger Connections for a Differential Measurement

Description Color CR10(X) CR23X & CR5000

Sensor Signal White Differential Input (H) Differential Input (H)

Sensor Signal Reference Green Differential Input (L) Differential Input (L)

Shield Clear G

Heater Resistor Signal Yellow Differential Input (H) Differential Input (H)

Heater Resistor Signal

Reference

Purple Differential Input (L) Differential Input (L)

Shield Clear G

Power Red SW12 SW12

Power Reference Black G G

External Power Control Jumper wire SW12-CTRL to

Control Port

External Power

Control Not Needed

4. Wiring

Connections to Campbell Scientific dataloggers are given in Tables 1 and 2.

The output of the HFP01SC can be measured using a single-ended analog

measurement (Instruction 1 or VoltSE()), however, a differential analog

measurement (Instruction 2 or VoltDiff()) is recommended.

The wiring convention is that the white wire is positive with respect to the

green wire, when energy is flowing through the transducer from the side with

the text “this side up” to the other side.

The switched 12 vdc port on the black CR10X wiring panel can

source enough current to calibrate five HFP01SC plates; the

CR23X and CR5000 switched 12 vdc port can be used to

calibrate four HFP01SC plates. If additional HFP01SC plates

are needed an external relay is required to power the additional

plates (see example 4).

NOTE

For dataloggers without a SW12V output (CR7X, 21X and CR10), a relay

(A21REL-12) is required for the in-situ calibration (see Example 4).

5. Example Programs

The HFP01SC has a nominal calibration of 15 W m

-2

-1

. Each sensor is

accompanied by a calibration certificate. Each sensor also has a unique

calibration label on it. The label is located on the pigtail end of the sensor

leads.

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Campbell HFP01SC Manual do Utilizador Página 8