The detection methods of environmental monitoring instrument products vary due to their types and uses, but usually include the following basic steps and aspects:

I. Basic detection methods
Calibration:
Use calibrated and verified standard instruments to calibrate the environmental monitoring instrument to be tested.
Calibration includes adjusting the zero point, sensitivity, and range of the instrument to ensure that the measurement results of the environmental monitoring instrument are consistent with those of the standard instrument.
Verification:
Use environmental samples of known concentrations to measure with the environmental monitoring instrument to be tested and the standard instrument respectively.
Compare the measurement results of the two, calculate the error rate, and ensure that the error rate is within an acceptable range.
Record and analysis:
During the calibration and verification process, record the date, time, instrument model, serial number, and measurement results in detail.
Analyze the recorded data, calculate the average error rate of calibration and verification, and perform statistical and trend analysis.
II. Examples of specific detection methods
Test paper colorimetry:
Soak the filter paper in the reagent to make a test paper, and hang it in the air to be tested when using it, or place the test paper in the sampling clamp and use a syringe to extract a certain amount of gas sample.
The harmful substances in the gas sample react with the color developer, the test paper changes color, and the color is compared with the standard color plate for quantitative determination.
This method is mostly used to determine gaseous, vaporous, and mist substances in the air, and is not suitable for determining smoke and dust.
Rapid solution method:
The harmful substances in the air to be tested react with the color developer, and after color development, the standard tube or artificial standard tube is used for colorimetric determination.
Its sensitivity and accuracy are higher than the test paper method.
Automatic monitoring system:
The automatic monitoring system is connected to many monitoring stations through electronic computers, and continuously analyzes, records, and displays the situation of the monitored area.
It can automatically monitor multiple air parameters and water quality parameters, and the computer and telemetry information center receive the air and water quality parameters input by each monitoring station.
When it does not meet the regulations, immediately notify the water quality and air source management office and take measures to eliminate pollution.
3. Detection methods of other specific instruments
Portable monitors:
Such as portable monitors of total hydrocarbons, methane, and non-methane total hydrocarbons in ambient air and exhaust gas, vibration tests, oxygen impact tests, response factor tests, etc. are required in accordance with technical requirements.
BOD monitor:
Preparation work is required before use, including checking whether the instrument is intact, connecting the power supply, preparing reagents and standard solutions, etc.
When performing BOD monitoring, it is necessary to prepare samples, pour the samples into the BOD monitor, and select the appropriate monitoring mode and parameter settings.
The instrument will automatically measure and calculate according to the set parameters, and display the changes in BOD values ​​in real time.
IV. Testing standards and requirements
Accuracy:
The calibration error rate of environmental monitoring instruments should meet the provisions of relevant national and local regulations.
The verification error rate should be controlled within a reasonable range within the measurement range, and the specific error limit should be set according to the specific environmental monitoring projects and requirements.
Representativeness:
The environmental samples used in the calibration and verification process should be representative, and the sample concentration range should cover the measurement range of the environmental monitoring instrument to be tested.
Regular calibration and verification:
To ensure the accuracy of environmental monitoring instruments, calibration and verification should be performed regularly.
The standard instruments used for calibration and verification should have high accuracy, and their accuracy should be confirmed by regular calibration and verification.
In summary, the testing methods for environmental monitoring instruments vary depending on their type and purpose but usually include basic steps such as calibration, verification, recording, and analysis. At the same time, different types of instruments have their own specific testing methods and requirements. When conducting tests, relevant standards and regulations should be strictly followed to ensure the accuracy and reliability of the test results.