Bilfinger Life Science 

Bilfinger Life Science

detex – CO detection for spray towers

The detex early fire detection system is used to detect thermal decomposition processes in the spray drying process. The aim is to detect a possible event at an early stage, before it becomes a potential hazard to the process or, in the worst case, before the production plant breaks down.

A proven method of detection is the monitoring of drying processes for carbon monoxide (CO). The use of non-dispersive infrared absorption (NDIR) makes it possible to map a very small measuring range. This is necessary due to the high air dilution in the process to reliably detect small traces of CO.

To meet these requirements, our Detex is equipped with a two-channel analysis module. This offers the advantage that both the absolute measured value of the exhaust air and the absolute measured value of the supply air are available at all times. This ensures that disruptive CO sources outside the process are detected at an early stage. The intelligent control system ensures that these disturbing influences are eliminated during alarm evaluation.

To ensure the longest possible trouble-free and maintenance-free operating time, the Detex is equipped with state-of-the-art probe technology for sample gas extraction. The exhaust air probe meets the high hygienic requirements in the food industry through the selection of the filter material, the design as an in-line filter and the use of a special mounting flange. Due to many years of experience of our process engineering department, only selected components are used for sample gas conditioning. These are characterized on the one hand by their long service life and on the other hand by their rapid availability.

A major challenge for early fire detection is safe and reliable detection during continuous operation of a production plant. In the Detex, an interval check of the analyzer is specifically provided for this purpose. Not only is a system check performed at the beginning of a drying period, but the system repeats this check at specified intervals.

Modern drying systems often have the possibility to dry different products. Fixed product-dependent parameters are set on the drying system by a simple recipe changeover. The synchronicity of the measured value recording in the early fire detection is usually set to one main product, so that a change of product can lead to a shift in the gas running times (supply air / exhaust air). For this reason, the Detex includes a modern measured value recording and evaluation, which is able to use the shift and ensure a safe alarm evaluation without delay.

The design of the Detex early fire detection system is compact and easy to maintain. The decisive factor for the use of “standard” control cabinets is the feedback from our customers coupled with our many years of experience in control cabinet construction. For the evaluation of the measured values, Detex is supported by a modern PLC and a touch panel in the on-site control cabinet. The use of a UPS system is of course included in the overall package.

The vast experience of our own programmers comes into full play in the creation and support of the software. All parameters and limit values can be set individually for each application and stored as a recipe.

Solutions for spray towers

detex – CO detection
vertex – cooling system
Fire extinguishing system
Mannloch-closure system
Retrofit spraying tower

“We trust in the innovative and secure solutions of GreyLogix.”

Dieter Geiken, Rücker GmbH / Aurich


The German Dairy Newspaper in conversation with Olaf Literski

Learn more


  • 2-channel analyzer
  • Interference detection
  • cyclic function test
  • Leak test included
  • hygienic probe technology
  • Compact design
  • easy to maintain

“We trust GreyLogix’s innovative and secure solutions.”

»For our company at the Aurich site, in my function as head of electrical engineering, I have the requirement to keep our plants at the cutting edge of technology. With the Detex CO detection system, we have a state-of-the-art solution that offers maximum availability and safety for our spray dryer. With this system we have the possibility to get the modernization of the safety technology from one source.
The company Bilfinger Greylogix foodtec offers us good solutions for this.«

Dieter Geiken (Rücker GmbH – Aurich)