Heat Flux Plate Sensors

HFP01

The HFP01 Heat flux plate is the world’s most popular sensor for heat flux measurement in the soil as well as through walls and building envelopes. The total thermal resistance is kept small by using a ceramics-plastic composite body. The sensor is very robust and stable. It is suitable for long term use on one location as well as repeated installation when a measuring system is used at multiple locations. If measuring in soil, in case a more accurate measurement is needed the model HFP01SC should be considered.

HFP01SC

The HFP01SC self-calibrating heat flux sensor™ 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.

• 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

HFP03

The HFP03 is an Ultra sensitive heat flux plate for measurement of small heat fluxes in the soil as well as through walls and building envelopes. The total thermal resistance is kept small by using a ceramics-plastic composite body. Putting several HFP01 sensors electrically in series is an alternative for using HFP03.