Fertilizer Production

A challenging environment for monitoring instruments

Process control and emissions monitoring at a fertilizer plant can be difficult due to aggressive process gases in high concentrations, sometimes at high temperatures and pressures. Use of extractive monitoring systems in such an environment requires a lot of maintenance and the instruments are prone to malfunction. However, unlike extractive systems, OPSIS non-contact monitoring technology has no problem handling these challenges.


The OPSIS monitoring systems can be used both for process control and for monitoring emissions. The OPSIS laser diode-based system is particularly well suited for process control thanks to its fast response time with resolution down to a few seconds. If continuous emissions monitoring is to be performed, OPSIS UV-DOAS and IR-DOAS systems are excellent choices, especially as they can monitor concentrations of all relevant gases with high precision.

OPSIS also offers monitoring systems to monitor fugitive emissions to the ambient air. Such systems can both document the pollution levels and function as an alarm system in case of accidental leaks. They can also be used as tools to trace the sources of emissions.


The OPSIS monitoring systems are based on gas analysers that have short response times, are accurate, and require minimal maintenance. The monitoring takes place contact-free along light beams where gas molecules can absorb parts of the light. In process and emissions monitoring, light beams are sent through the gas channels, or some of the gases are led into measurement cells through which the light is sent. The light is captured and led via optical fibres to the analyser which measures the absorption and calculates the gas concentrations.

A single analyser can measure several types of gases along several light paths. It provides a very cost-effective monitoring system. The concentrations of all relevant types of gases can be monitored, for example NH3, NOX, and HF.


There are multiple reasons for choosing OPSIS as supplier of systems for gas analysis. Among the key benefits of the methods and solutions offered by OPSIS are:

  • one system for all components
  • a single system can measure at several monitoring points
  • combines the benefits of the UV-DOAS, FTIR-DOAS, and TDL techniques
  • best performance according to QAL1 certification
  • longest calibration interval according to QAL1 certification
  • optional automatic QAL3 control
  • non-contact monitoring, no sampling
  • long maintenance interval
  • low energy consumption
  • gas calibration only once a year
  • thousands of systems installed worldwide
  • certified by, among others, German TÜV and under British MCERTS standards.


Annual Calibration

System 400 – One system, three solutions

System 400 – One System, Three Solutions – Cross-stack

System 400 – One System, Three Solutions – Fast-loop

System 400 – One System, Three Solutions – HWE

OPSIS Data Services

Contact Matthias T OPSIS 720X480pxl

Contact me if you want to know more about our products for monitoring in fertilizer production!