In the fields of sewage treatment, industrial discharge, and drinking water safety, ammonia nitrogen (NH3-N) is a key indicator for measuring water pollution, and its concentration directly affects the ecological environment and human health.The online ammonia nitrogen detector monitors the ammonia nitrogen content in water in real time, transforming invisible water quality risks into intuitive data and becoming a 'digital sentinel' for environmental supervision.Mastering its standardized operating procedures is the foundation for ensuring the accuracy of monitoring data.

　　1、 Installation and calibration: a prerequisite for precise monitoring

Equipment installation must strictly follow environmental requirements: choose a location with good ventilation, away from corrosive gases and strong electromagnetic interference, ensure a stable connection between the water sample inlet and the power supply, and place the device horizontally on a stable table. Zero and range calibration is required before initial use - zero calibration is performed by injecting ammonia free pure water, and then range calibration is performed using standard ammonia nitrogen solution to control the deviation between the measured value and the standard value within ± 5%. Some devices also need to automatically compensate for pH, temperature, and potassium ion interference, and stability needs to be verified after calibration (with a continuous measurement deviation of less than 0.1mg/L for 3 times).

　　2、 Detection and operation: automated monitoring and real-time feedback

After starting the instrument, the system automatically completes initialization and enters continuous monitoring mode. The water sample flows into the pre-treatment unit through a pipeline and is then mixed with reagents to undergo a color reaction - ammonia nitrogen forms a specific color complex with the reagent (such as a green compound). The detector captures changes in color intensity or electrical signal, and converts it into ammonia nitrogen concentration value (unit mg/L) through a built-in algorithm. It is displayed on the screen in real time and synchronously transmitted to the monitoring system (supporting RS485 Modbus protocol, such as PM8202I type 2-channel 4-20mA output). During operation, it is necessary to maintain a stable water sample flow rate (usually 0.5-2L/min) to avoid bubbles or blockages affecting detection accuracy.

　　3、 Maintenance and Data Management: Long term Stable Guarantee

Daily maintenance includes regular cleaning of the injection port and reaction tank, checking the remaining amount of reagents, and verifying the calibration cycle. The device automatically stores historical data and supports export analysis (such as generating daily/weekly/monthly concentration change curves). Abnormal data triggers an alarm, prompting operators to investigate pollution sources or equipment failures. When not in use for a long time, the residual water sample in the pipeline should be drained, the power should be cut off, and a dust cover should be covered to extend the life of core components (such as light sources and electrodes).

From installation and calibration to real-time monitoring, and then to maintenance and management, the online ammonia nitrogen detector achieves precise tracking of water pollution through standardized operating procedures, building a technological defense line for water environment governance and ecological security.