Infrared Dough Temperature Control in Industrial Mixers

Why Dough Temperature Is Critical in Industrial Mixing Processes

Industrial dough production in bakeries and at manufacturers of dough processing machinery is a sensitive process in which temperature plays a decisive role. Dough mainly consists of water, flour, and yeast. During the mixing and homogenization process, the yeast becomes active, metabolizes sugars, and releases gases that later determine volume, texture, and softness of baked products. This biological activity is strongly temperature dependent and typically takes place in a range between approximately 15 °C and 25 °C, with short-term temperatures of up to 30 °C occurring in certain process phases.

In industrial dough mixers, all ingredients are fed into a container and mechanically mixed. Friction, mixing intensity, and residence time generate heat, which directly affects dough temperature. At the same time, external factors such as ambient temperature, humidity, and raw material temperature influence the process. Without targeted monitoring, temperature deviations can easily occur. If the dough temperature is too low, yeast activity is reduced, resulting in insufficient volume and inadequate softness. If the dough overheats, yeast cells are destroyed, leading to product failure and scrap.

Traditionally, many bakeries rely on operator experience and manual intervention to control the mixing process. Especially under changing environmental conditions, this approach requires skilled personnel to continuously monitor and adjust the process. In a cost-sensitive and highly competitive market, this method is increasingly inefficient. The motivation for automated temperature monitoring is therefore to stabilize product quality, reduce waste, and lower labor costs.

A specific challenge arises from the fact that not only the dough but also the mixer itself enters the sensor’s field of view during operation. Metallic mixing tools exhibit different thermal properties than dough and can distort temperature readings. Reliable infrared temperature measurement must therefore selectively detect the dough surface temperature while suppressing interference from machine components. This is where non-contact infrared temperature measurement using a suitable infrared pyrometer becomes essential.

Infrared Temperature Measurement for Reproducible Dough Quality

The use of the Optris CS LT leads to stable and reproducible temperature control throughout the dough processing stage. Continuous infrared temperature measurement keeps the dough reliably within the optimal temperature window for yeast activity. Deviations are detected at an early stage and automatically compensated before quality losses occur. The result is consistent product characteristics, reduced scrap rates, and significantly improved process reliability.

A major benefit for the user is the high level of automation. The machine operates independently of operator experience and remains stable even under changing ambient conditions. Temperature-dependent adjustments of mixing intensity are performed automatically based on the readings from the infrared pyrometer. This reduces the need for skilled labor and delivers clear economic advantages, particularly in labor-intensive and cost-sensitive bakery operations.

The unique selling points of the Optris solution result from the combination of measurement accuracy, robustness, and ease of integration. The CS LT achieves a system accuracy of ±1.5 % or ±1.5 °C along with excellent repeatability, which is essential for closed-loop process control. Low thermal drift and minimal noise ensure stable temperature readings even when ambient conditions fluctuate.

Compared to an IR camera or thermal imaging solution, the CS LT offers a significantly more cost-effective approach for serial production machines. While a thermal camera or thermal imager can provide additional information on temperature distribution, reliable process control in daily production typically requires only a precise point measurement. This makes the CS LT infrared thermometer the preferred choice for OEMs manufacturing high volumes of industrial dough mixers.

In this application, Optris positions itself not merely as a sensor supplier but as a long-term technology partner. In addition to robust hardware, the company provides extensive expertise in infrared temperature measurement, application consulting, and system integration. High product quality, industrial-grade design, and decades of experience in pyrometers and infrared sensor technology make Optris the preferred partner for bakeries and machine manufacturers aiming to automate and secure their production processes sustainably.