1、 Daily cleaning and inspection

1. External cleaning
   • Gently wipe the instrument casing with a soft, dry cloth or tissue to remove surface dirt and dust.
   • Avoid using chemical cleaners or cloths with moisture to wipe the instrument to prevent damage.
   • The display screen needs to be gently wiped with a specialized screen cleaner or a soft damp cloth to ensure clear display.
2. Internal cleaning
   • Regularly turn on the instrument and wipe the internal parts with a soft damp cloth, taking care to avoid water dripping into the instrument.
   • Check the measuring pool, pipelines, and other components, rinse with pure water to remove residual water samples and reagents, and prevent blockage or contamination.
   • After each use, ensure that there are no residues in the injection and waste ports to prevent blockages that may affect the next measurement.

2、 Regular calibration and verification

1. Calibration preparation
   • Use standard solution for zero calibration of the instrument to ensure accurate baseline readings under ammonia free conditions.
   • Perform multi-point calibration using a standard solution of known concentration, and adjust parameters by comparing instrument readings with standard values.
2. Calibration execution
   • Strictly follow the instrument manual to avoid errors.
   • The calibration frequency is determined based on the usage frequency and manufacturer's recommendations, usually every 3-6 months.
3. Verify measurement
   • Regularly validate with actual water samples or known concentration samples to test the measurement accuracy and stability of the instrument.
   • Record calibration data, including calibration time, standard solution concentration, instrument readings, etc., for subsequent analysis.

3、 Component maintenance and replacement

1. sensor check
   • Sensors are critical components, and their integrity should be checked regularly.
   • When the sensor is found to be damaged or aged, replace it in a timely manner or contact professional personnel for repair.
2. consumable replacement
   • According to the instrument manual requirements, regularly replace consumables such as reagents and filter cartridges.
   • Pay attention to the expiration date and appearance of the reagent, and replace it promptly if there are any abnormalities.
3. Inspection of circuit board and connecting wires
   • Regularly check whether the circuit board and connecting wires are intact, and replace them in a timely manner if they are damaged or aged.

4、 Environmental control and storage

1. Work environment requirements
   • The temperature should be controlled between 5-35 ℃ to avoid accelerating the aging of electrical components and lamps due to excessive temperature.
   • The relative humidity should not exceed 85% to prevent electrical components from aging or burning out, and to prevent mold growth on the aluminum coating on the surface of optical components.
   • Avoid strong electromagnetic interference sources such as large motors, transformers, etc.
2. storage requirements
   • When the instrument is not in use, store it in the instrument box.
   • The storage environment should be dry, ventilated, dust-free, and avoid direct sunlight and high temperatures.
   • When not in use for a long time, empty the reagent system and rinse the pipeline with protective solution.

5、 Troubleshooting and Maintenance

1. troubleshooting
   • Based on the instrument error information or abnormal phenomena, gradually investigate the possible causes, such as whether the power supply is normal, whether the pipeline is blocked, whether the reagent is expired, etc.
   • Record the fault symptoms, handling methods, and results to form a fault database for future reference.
2. Professional maintenance
   • For faults that cannot be resolved by oneself, contact the instrument manufacturer or professional maintenance organization for repair.
   • Provide detailed fault descriptions and usage information during maintenance to enable maintenance personnel to accurately diagnose the problem.

6、 Operating standards and training

1. Operating Specifications
   • Strictly follow the instrument manual and operating procedures to avoid damage to the instrument or inaccurate measurement results caused by misoperation.
   • Before use, check if the power cord, sensors, etc. are connected properly to avoid loosening and affecting the operation of the instrument.
   • Choose the appropriate detection range and measurement range as needed to avoid exceeding the maximum range of the instrument.
2. personnel training
   • Provide instrument operation and maintenance training to new users to familiarize them with the various functions and operation steps of the instrument.
   • The training content includes instrument principles, operation methods, daily maintenance, fault handling, etc.