R-Value Measurement System from FluxTeq

The FluxTeq R-value measurement system is an easy way of measuring the R-value of building materials. It consists of an inexpensive Arduino-based data acquisition system that measures R-value directly using its heat flux and temperature sensors.

The system comprises of a PHFS-09e heat flux sensor and an additional temperature sensor to allow for simultaneously measuring the inside and outside temperatures along with the heat flux. The calculated R-value is then stored on an SD card in Excel file format.

The equipment is standalone and does not require a computer. The tap of a button will immediately begin data collection. It uses the ASTM C1046 and ASTM C1155 standards and is the only method of measuring R-values in situ.

An extra thermocouple allows for outside surface temperature measurements.

Key Features

  • User-friendly
  • Non-invasive
  • Standalone, no computer needed, with readout displayed on an LCD screen
  • SD card
  • Micro USB power adapter for charging device
  • Can measure R-value of thermal insulation, walls, windows, etc. in situ
  • Cost: $750 for the system and sensors, can be rented for $50 per month in the US (sensors need to be purchased)


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Input Signal Type: Heat flux sensor and Type-T Thermocouple Analog DC Voltages
Number of Channels: 8 Differential (3 used but can request custom programming/sensors)
Type of ADC: 24-bit Delta-Sigma
Voltage Resolution: <1 µV
Heat Flux Resolution Using PHFS-01: Approximately 1–2 W/m2
Heat Flux Resolution Using PHFS-09: Approximately 0.1–0.2 W/m2
Maximum Sampling Rate: Up to 2.5 Hz
Overall Package Dimensions: 5.0" x 4.2" x 3.5" (12.7 x 10.7 x 8.9 cm)
Standard Features: Integrated Thermistor for Cold Junction Temperature Compensation
SD Memory Card Storage Capacity: 8 Gigabytes (SD card included)
Number of Measurements: Approx. 10 million measurements using all 8 channels

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