Training case of GNST-900S multi parameter water quality detector in the laboratory of Nanhai Institute of Oceanography, Guangzhou, Guangdong Province

1、 Training background and objectives

（1） Background OverviewAs the core force of marine scientific research in the South China Sea, the Institute of Oceanography (hereinafter referred to as "Nanhai Institute") has long been committed to cutting-edge scientific research work such as ecological environment monitoring and marine pollution prevention in the South China Sea. The coastal waters of the South China Sea are facing environmental issues such as eutrophication, with core monitoring indicators including dissolved oxygen (DO), chemical oxygen demand (COD), inorganic nitrogen, reactive phosphates, and heavy metal ions such as mercury, cadmium, and lead. In order to comply with the requirements of the "Marine Water Quality Standards" (GB 3097-1997), improve the accuracy and efficiency of water quality sample testing in the South China Sea, and support the promotion of key scientific research projects such as "Eutrophication Evolution Mechanism in the South China Sea Coastal Areas" and "Tracing of Marine Heavy Metal Pollution", the research institute has upgraded its marine environment monitoring laboratory and introduced the GNST-900S multi parameter water quality analyzer. This instrument is designed based on IoT intelligence and is equipped with Genesite intelligent detection system and ST32 ARM processor. It can accurately detect more than 40 water quality indicators. Its low detection limit and high stability are suitable for the detection needs of low concentration pollutants in the South China Sea, and can efficiently support laboratory precision analysis work after field sampling. To ensure that researchers fully master the correct operation, precise calibration, data interpretation, and daily maintenance skills of instruments, and fully leverage the core supporting role of equipment in marine environmental research, the research institute has partnered with instrument supplier Henan Suijing Environmental Protection Technology Co., Ltd. to conduct targeted special training.

（2） Core objective

1. Theoretical level: Enable trainees to understand the detection principle, core technical indicators, and national standard basis of GNST-900S instrument, and clarify the applicable scenarios for different water quality indicators testing.

2. Practical level: Ensure that trainees are proficient in the entire process of instrument startup self check, parameter calibration, sample preparation and testing, data storage and export, and can independently complete the testing of typical water quality indicators.

3. Guarantee level: Master the common troubleshooting methods and daily maintenance points of instruments, extend the service life of instruments, and ensure the long-term stability and reliability of detection data.

4. Application level: To achieve deep integration of theory and scientific research practice, enhance the ability of trainees to use instruments to solve practical scientific research problems, and lay the foundation for the smooth progress of related environmental monitoring scientific research projects.

5. Theoretical level: Enable trainees to understand the detection principle, core technical indicators, and national standard basis of GNST-900S instrument, and clarify the adaptation scenarios of the instrument in water quality monitoring (such as eutrophication indicators and heavy metal detection) in the South China Sea.

6. On the practical level: Ensure that trainees are proficient in the entire process of instrument startup self check, parameter calibration, ocean water sample preparation and testing, data storage and export, and can independently complete accurate detection of typical water quality indicators in the South China Sea.

7. Guarantee level: Master the common troubleshooting methods and daily maintenance points of instruments, extend the service life of instruments, and ensure the stability and comparability of long-term scientific research monitoring data.

8. Application level: To achieve deep integration of theory and scientific research practice, enhance the ability of trainees to use instruments to solve complex water quality sample detection problems in the South China Sea, and lay the foundation for the smooth progress of key marine environmental research projects.

2、 Training preparation

（1） Organizational Structure

（2） Preliminary preparation

1. Site and equipment preparation: The standardization laboratory of the research institute is selected as the training site, and the operation table is organized in advance to ensure good ventilation and that the temperature and humidity meet the requirements for instrument operation (temperature 5-40 ℃, relative humidity ≤ 85% RH). Place the GNST-900S host, multifunctional intelligent digestion instrument, supporting testing tubes, prefabricated reagents and other equipment and materials in place according to the operating line, complete the power connection and power on self-test, and ensure that all equipment is in normal working condition; Prepare calibration solution, simulated water sample, deionized water, lens cleaning paper and other practical consumables at the same time.

2. Site and equipment preparation: The standardized marine environment monitoring laboratory of the research institute is selected as the training site. The operation platform is organized in advance, and the sample processing area and instrument operation area are divided to ensure good ventilation and temperature and humidity meet the requirements of instrument operation (temperature 5-40 ℃, relative humidity ≤ 85% RH). Place the GNST-900S host, multifunctional intelligent digestion instrument, supporting testing tubes, prefabricated reagents and other equipment and materials in place according to the operating line, complete the power connection and power on self-test, and ensure that all equipment is in normal working condition; At the same time, prepare calibration solutions, actual water samples from the South China Sea (including comparison samples from different coastal areas), standard samples, deionized water, filter membranes, and other practical consumables.

3. Preparation of materials and tools: Each participant shall be equipped with one set of "GNST-900S Multi parameter Water Quality Tester Manual", training materials (including theoretical knowledge points, operation process diagrams, and common problem manuals), and electrical insulation tools, equipment debugging tools, and materials such as "Training Sign in Form" and "Practical Assessment Scoring Form".

3、 Training Implementation Process

（1） Theoretical explanation session (9:00-10:30)

1. Technical specifications and functions: Introduce key technical parameters such as the detection range, detection limit, relative error, and repeatability of the instrument, demonstrate the operation logic of the 8-inch IPS high-definition color touch screen, and explain the application scenarios of core functions such as data storage (supporting 100000 data storage), automatic printing, and batch testing.

1. Maintenance and troubleshooting basics: Briefly explain the core points of daily instrument maintenance, such as probe cleaning, reagent storage, battery maintenance, etc; Briefly introduce the preliminary judgment methods for common faults such as unresponsive startup and data drift.

（2） Practical demonstration session (10:40-11:40)

1. Instrument initialization: Demonstrate the power on self-test process and explain how to determine the operating status of the instrument hardware (display screen, buttons, light source) and software system; Introduce the parameter adjustment methods for the system settings interface, such as date and time settings, measurement unit switching, etc.

1. Data export: Demonstrate the operation steps of exporting detection data to a computer through a USB interface, and explain the interpretation method and archiving requirements of data files.

2. Closing operation: Explain the cleaning process of the instrument after the detection is completed (rinse the probe and detection channel with deionized water), the correct storage method of the probe, and the key points of equipment organization.

（3） Group practice session (13:30-16:00)

1. Fault simulation and troubleshooting: The instructor sets common fault scenarios, such as "instrument unresponsive", "large data fluctuations", "data export failure", etc., and divides the trainees into groups to troubleshoot and solve them, strengthening their grasp of fault handling methods.

（4） Assessment and Summary Session (16:10-17:00)

1. Feedback collection: Distribute training feedback questionnaires to collect opinions and suggestions from trainees on training content, lecturer level, practical arrangements, and other aspects, providing reference for optimizing training work in the future.

4、 Training effectiveness

1. Management standards: Established a registration system for instrument use, regular calibration and maintenance system, and clarified equipment management responsibilities for trainees, effectively reducing instrument failure rates and extending equipment service life.

5、 Experience Summary and Prospect

（1） Experience summary

1. Practical orientation is the core: adopting a practical teaching mode of "demonstration+practice+fault simulation", participants can master skills in practice, and correct erroneous operations in a timely manner through one-on-one guidance, effectively improving learning efficiency.

（2） Future prospects