Urea or ammonia (NH₃) is often used in the reduction of nitrogen oxides from combustion processes. In the process known as selective catalytic reduction, ammonia must be dosed very precisely in order to achieve the desired conversion to nitrogen with the highest possible efficiency. The Axetris LGD F200P2-H NH3/H2O laser gas detection OEM module detects ammonia down to the sub-ppm range, ensuring stable processes.