Model HFP01 Soil Heat Flux Plate
6.2 Wiring
Connections to Campbell Scientific dataloggers are given in Table 6-1 and
Figure 6-2. The output of the HF01 can be measured using a single-ended
analog measurement (
VoltSE()
in CRBasic or Instruction 1 in Edlog) or a
differential analog measurement (
VoltDiff()
in CRBasic or Instruction 2 in
Edlog).
TABLE 6-1. Datalogger Connections for a
Single-Ended Measurement
Description
Color
CR10(X), CR510,
CR500
CR800, CR850,
CR1000, CR3000,
CR5000, CR23X,
21X, CR7,
Signal
White
Single-Ended Input
Single-Ended Input
Signal Reference
Green
AG
Shield Clear
G
6.3 Programming
To calculate the calibration multiplier, divide 1000 by the nominal calibration
sensitivity (i.e., 1000/sensitivity). The nominal calibration sensitivity is unique
for each HFP01. Each sensor is accompanied with a calibration certificate and
has a label on it with the calibration values. The label is located on the pigtail
end of the sensor leads.
In example 1, the nominal calibration sensitivity is 67.1
μ
V/W
-2
for the
HFP01#1 and 67.0
μ
V/W
-2
for the HFP01#2. In examples 2 and 3, the
nominal calibration sensitivity is 67.1
μ
V/W
-2
.
TABLE 6-2. Wiring for Example 1
Description
Color
CR3000
Sensor Signal #1
White
7H
Sensor Signal Reference #1
Green
7L
Shield #1
Clear
Sensor Signal #2
White
8H
Sensor Signal Reference #2
Green
8L
Shield #2
Clear
5
