Has anyone used an ammonia leak detector (infrared measurement method) on their urea production plants?

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We have a new urea production project, Project 40.80, and we plan to install an ammonia leak detection analyzer. I was wondering if anyone here has one that they can recommend? How is it working? Among the factories we examined, Haoyuan and Hengsheng (both equipped with synthesis towers and scrubbers) have leak detection analyzers installed. Leak detection in the synthesis towers is carried out using nitrogen or air; the gas flow is collected through the leak detection ports and then sent to the analyzer for pressure reduction, followed by preprocessing before it enters the analyzer. Each leak detection tube at the site is equipped with a drain valve and a shut-off valve. The analyzer used is a Beifen Mahak analyzer model 0-300PPmNH3 analyzer (integrated with the XFS-2006 model by Nanjing Xinfen Measurement and Control Instruments Co., Ltd.); the price of one such analyzer is around 30,000 to 40,000 yuan. Setting up alarms on monitoring makes it safer and more reliable. Firstly, ammonia leak detection alarms help ensure the safe operation of equipment: On August 24, 2005, the General Administration of Quality Supervision, Inspection and Quarantine issued Document No. Guo Jian Zhi Te Han 689, titled “Notice on Further Strengthening the Inspection Work Related to the Production and Use of Urea Synthesis Towers.” This document sets out detailed requirements regarding the design structure, manufacturing materials, pre-shipment inspections, service life, and safety management of urea synthesis towers. With regard to the safety management of such towers in use, it stipulates that regular inspections and tests must be carried out, as well as strict adherence to startup and shutdown procedures and control of process parameters. In addition, it recommends carrying out online leak detection on urea synthesis towers during operation, using infrared analyzers to monitor leaks in the interior of these towers in real time, so as to identify and eliminate potential hazards promptly. Second, it can reduce the number of inspections and decrease the use of medications. In addition to the regular maintenance of the analyzer, reducing the frequency of inspections has saved a great deal of manpower and resources.