Campbell Scientific HFP01 Soil Heat Flux Plate - Manual (Page 11)

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 μV/W -2 for the
HFP01#1 and 67.0 μV/W -2 for the HFP01#2. In examples 2 and 3, the
nominal calibration sensitivity is 67.1 μV/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
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