Why Airis can do what other devices can’t – Multi-wavelength Temperature Analysis

Airis uses a unique patented temperature measurement technique to accurately measure the temperature of pans on a cooktop

We are often asked how Airis differs from other cooker safety technology. Safera technology works reliably in all situations, thanks to more than a decade of research and development.

The difference can be seen in everyday use. A practical example is familiar to many: traditional cooker shut-off devices may alarm unnecessarily or even fail to work in an emergency. They rely on a simple but flawed method of temperature measurement that ignores a fundamental issue: pots and pans aren’t all made of the same materials. The problem is caused by a familiar phenomenon in physics: different materials radiate heat in different ways, even though they are just as hot. Safera developed and patented a solution to this problem.

The most important consideration for safety is to ensure that the temperature of cookware does not rise so high that an oil fire ignites. However, the real challenge is to ensure that safe, normal high-temperature frying can continue if there’s no danger.

If cooking is to be safe and unencumbered, the safety device must therefore be able to measure the temperatures of different cookware accurately.

Measuring temperature is not as simple as one might think. Oftentimes,  pans of different sizes and made of different materials are used on the hob simultaneously. Identifying a dangerously hot pan amongst them requires more than a single-wavelength type measurement.

Traditional single-wavelength and multi-pixel IR sensors cannot distinguish between the thermal radiation of different materials

The difference between the heat radiation of the pans can be one factor of many. If you were to use an off-the-shelf infrared sensor to measure the temperature of a shiny stainless-steel pan, it might, for example, read 40C, even though the actual temperature of the pan is 100C. If a single wavelength of IR is measured, it is practically impossible to reliably identify the actual temperature of different pans. Airis is the only cooking safety device to overcome this problem.

Some manufacturers are trying to solve the problem by using multi-pixel, even 64-pixel sensors. These can provide information on the temperature differences of the hob surface, but they are not able to accurately measure the differences in the thermal radiation of different materials and thus the actual temperatures of the cookware.

In fact, by adding pixels, more incorrect measurements can end up being taken! Instead of increasing the number of sensors, the problem needs a different, more sophisticated solution.

Measuring the temperature of the pan is difficult because different materials radiate differently

Measuring the temperature directly at the surface of each pan would produce an accurate result, but this is impractical. Infrared measurement is therefore the only practical option for cooker shut-off devices.

The challenge of indirect IR measurement is that different materials radiate heat in very different ways.

Black cookware, such as cast iron pots or Teflon frying pans, strongly radiate heat. In contrast, shiny pans such as stainless steel emit significantly less heat.

Why is pan temperature important?

The infrared ‘seen’ by the sensor comes from the sides and bottoms of the pans. Even where the bottom of a pan is covered in oil, the signature of the infrared emitted still relates to the type of pan underneath. Taking account of the emissivity of the pan surfaces is therefore key to obtaining an accurate assessment.

The sensor system developed by Safera is designed to reliably measure the temperature of various cookware

There are no ready-made sensors for reliable measurements of the hob surface temperature. Safera has solved the problem by developing its own patented sensor system that measures several different wavelengths of thermal radiation at the same time.

By combining several measurements in different wavelength ranges, Airis is able to detect temperatures reliably and accurately for all types of cookware, regardless of what material they are made of.

Thanks to this unique technology, Airis is able to detect a single dangerously overheated vessel amongst several.

The technology in Airis is evident in everyday use

Because the temperature measurements taken by Airis accurately correspond to a real risk situation, Airis quickly detects hazards and does not alarm unnecessarily during normal cooking – whether you have a Teflon-coated pan, a steel kettle, or both at the same time.