Temperature and Humidity

• Our heat flux sensors are designed for applications up to 120 °C

• The glass fiber composite or silicone structure is robust against humidity and harsh environments.

• For long-term applications with moisture exposure or high humidity, we recommend additional protective measures to limit water vapour ingress.

• Effective sealing can be achieved using aluminium adhesive foil, bituminous foil, or butyl rubber

Optical considerations

• Optical emission and absorption properties of the sensor surface should ideally match those of the measured surface.

• Metal foils sometimes require an additional coating with suitable emissivity.
• By comparing measurements with a matte black surface and a highly reflective surface, radiative and conductive components of the heat flux can be separated

Thermal interface and Adhesives

• Solvent-based or water-based adhesives (e.g. acrylic) can be used on absorbent or diffusion-open substrates

• Note: During the initial measurement phase, thermal effects from evaporation heat may occur.

Signal Noise and Shielding

• Due to the low source resistance, cable resistance can be neglected with high-impedance instruments (typically a few MΩ), so almost any cable cross-section is suitable.

• Interference effects such as mains hum are negligible, so shielded cables are generally unnecessary.