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HFP01SC heat flux sensor

HFP01SC heat flux sensor
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Thermal Sensors Self-calibrating heat flux sensorTM HFP01SC self-calibrating heat flux sensorTM is a heat flux sensor for use in the soil. It offers the best available accuracy and quality assurance of the measurement. The on-line self-test verifies the stable performance and good thermal contact of sensors that are buried and cannot be visually inspected and taken to the laboratory for recalibration. The self-test also includes self-calibration which compensates for measurement errors caused by the thermal conductivity of the surrounding soil (which varies with soil moisture content), for sensor non-stability and for temperature dependence. Figure 1 HFP01SC self-calibrating heat flux sensor. The opposite side has a blue coloured cover. HFP01SC measures soil heat flux in W/m2. It is used when the highest level of quality assurance and a high measurement accuracy are required. In essence, HFP01SC is a combination of a heat flux sensor and a film heater. The heat flux sensor output is a voltage signal that is proportional heat flux through the sensor. At a regular interval the film heater is activated to perform a self-test (see figure 4). The self-test results in a verification of sensor contact to the soil and in a new sensitivity that is valid for the circumstances at that moment. The latter is called self-calibration. Implicitly also cable connection, data acquisition and data processing are tested. The result is a much improved accuracy & quality assurance of the measurement relative to measurements with conventional sensors such as model HFP01. Soil heat flux sensors are preferably left in the soil for as long as possible, so that the soil properties become representative of the local conditions. Using self-testing, the user no longer needs to take sensors to the laboratory to verify their stable performance. A typical measurement location is equipped with 2 or more sensors for good spatial averaging. Unique features and benefits • • • • • • Figure 2 HFP01SC is used in soil heat flux measurements in high-accuracy surface energy flux experiments low thermal resistance large guard area (required by the ISO 9869 standard) low electrical resistance (low pickup of electrical noise) high sensitivity (good signal to noise ratio in low-flux environments) robustness, including a strong cable (essential for permanently installed sensors) IP protection class: IP67 (essential for outdoor application) incorporated film heater for self-testing Copyright by Hukseflux. Version 1808. We reserve the right to change specifications without prior notice Page 1/3. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hu

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Thermal Sensors high-accuracy scientific measurement of soil heat flux, with a high level of data quality assurance Measurement and control Requirements for data acquisition and control: • for heat flux: one millivolt measurement • for heater current: one current measurement (or voltage over a current sensing resistor) • for switching the heater current on and off: one relay with 12 VDC nominal output Calibration HFP01SC calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130. HFP01SC specifications Measurand On-line...

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Thermal Sensors MARKET LEADER IN HEAT FLUX MEASUREMENT HFP01SC outperforms competing models: how? HFP01SC is the world’s market leading model for soil heat flux measurement with self-test. Purchasing a HFP01SC is a good investment in accurate and stable measurement. Durable cable with strain relief World market leader Low disturbance: small thermal resistance HFP01SC is 5.6 mm thick, but thanks to its ceramicsplastic composite body it is thermally thin. Its thermal resistance is comparable to 1.6 mm normal plastic, causing little disturbance of the undisturbed heat flux. HFP01SC is on the...

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HFP01SC heat flux sensor 3Pages

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HFP01SC heat flux sensor
3Pages