HFP01SC

Self-Calibrating Soil Heat Flux Plate
HFP01SC

HFP01SC

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Self-Calibrating Soil Heat Flux Plate

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Model:
HFP01SC
Item Number:
45186
Warranty:
1 year

Overview

The HFP01SC, manufactured by Hukseflux, measures soil heat flux—typically for energy-balance or Bowen-ratio flux systems. It is intended for applications requiring the highest possible degree of measurement accuracy. The HFP01SC outputs a voltage signal that is proportional to the heat flux of the surrounding medium. At least two sensors are required for each site to provide spatial averaging. Sites with heterogeneous media may require additional sensors.

Key Advantages

Extreme Accuracy
Self-calibrating; ideal for energy-balance in eddy-covariance and Bowen-ratio systems

Technical Description

The HFP01SC consists of a thermopile and a film heater. The thermopile measures temperature gradients across the plate. During the in-situ field calibration, the film heater is used to generate a heat flux through the plate. The amount of power used to generate the calibration heat flux is measured by the data logger. Each plate is individually calibrated, at the factory, to output flux.

Self-calibration corrects for errors due to differences in thermal conductivity between the sensor and surrounding medium, temperature variations, and slight sensor instabilities.

Note: In an energy-balance installation, all sensors must be completely inserted into the soil face before the hole is backfilled.

Benefits

  • Corrects for errors due to differences in thermal conductivity between the sensor and surrounding medium, temperature variations, and slight sensor instabilities
  • Compatible with most Campbell Scientific data loggers
  • Uses Van den Bos-Hoeksma self-calibration method to provide a high degree of measurement accuracy

Specifications

Sensor Type
Thermopile with film heater
Sensitivity
50 μV W-1 m-2

(nominal)

Nominal Resistance
2 Ω
Temperature Range
-30° to +70°C
Expected Typical Accuracy
±3% of reading
Heater Resistance
100 Ω

(nominal)

Heater Voltage Input
9 to 15 Vdc
Heater Voltage Output
0 to 2 Vdc
Duration of Calibration
±3 minutes @ 1.5 W

(typically performed every 3 to 6 hours)

Average Power Consumption
0.02 to 0.04 W
Plate Diameter
80 mm

(3.15 in.)

Plate Thickness
5 mm

(0.20 in.)

Weight
200 g

(7.05 oz) without cable

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