The inspection of leak detectors with integrated cameras requires a comprehensive evaluation of five core standards: leak detection accuracy, camera performance, system integration functionality, environmental adaptability, safety, and compliance. The following are specific inspection standards and analysis:
1、 Leakage detection accuracy and sensitivity
Minimum detectable leakage rate:
The instrument should be able to detect extremely small leaks, for example, the LD500/510 leak detector can locate tiny leaks of 0.1l/min (0.003cfm), which is equivalent to a cost loss of 1 euro per year.
During inspection, a standard leakage source should be used for calibration to ensure the accuracy of the instrument's detection at different leakage rates.
Response time and purification time:
Response time refers to the time it takes for the instrument to observe the indication signal from its appearance to stability, and should be as short as possible to quickly locate the leak.
The purification time refers to the time it takes for the instrument output to decrease to 37% of the initial value after the gas stops being applied to the inspection system. It should also be as short as possible to improve detection efficiency.
System sensitivity and calibration:
The sensitivity of the system should be measured before inspection, after inspection completion, and during the inspection process, with each measurement not exceeding 2 hours.
If the instrument deflection, audio alarm, or indicator light indicates that the system cannot detect the specified leakage rate, the system sensitivity needs to be recalibrated and all parts after the last qualified calibration need to be rechecked.
2、 Camera performance and image quality
Resolution and clarity:
The camera should have high resolution to capture clear images of the leakage point.
During inspection, standard test images and light sources can be used for image quality testing to evaluate the resolution and clarity of the camera.
Low light performance:
The camera should be able to provide clear images even in low light environments to meet the detection needs under different lighting conditions.
During inspection, images can be taken under low light conditions and quality can be evaluated.
Color restoration and signal-to-noise ratio:
The camera should be able to accurately reproduce the color information of the leakage point, improving detection accuracy.
The signal-to-noise ratio is also an important indicator for evaluating camera performance. A high signal-to-noise ratio helps reduce image noise and improve image quality.
3、 System integration and functional testing
Data management and report generation:
The instrument should be able to store photos of leaks and related information, such as necessary operations for repairing leaks.
During inspection, it is necessary to test whether the instrument can transmit detailed leakage information to computer software via USB and generate a leakage report.
Laser ranging and cost calculation:
The instrument should be equipped with a laser ranging module to accurately focus and determine the leakage rate.
When inspecting, it is necessary to test whether the instrument can determine the priority of each leak based on its size and cost, and calculate the potential savings (in currency/year).
User interface and operational convenience:
The instrument should have an intuitive user interface that is easy for operators to quickly get started.
During inspection, the ease of operation of the instrument can be evaluated, such as the response speed of the touch screen and the rationality of menu settings.
4、 Environmental adaptability and durability
Working temperature and humidity range:
The instrument should be able to operate normally within a certain temperature and humidity range to meet the detection needs of different environments.
During inspection, it is necessary to test the performance stability of the instrument under different temperature and humidity conditions.
Protection level and durability:
The instrument casing should have sufficient protection level to prevent solid particles and liquids from entering.
During inspection, testing can be conducted in accordance with GB4208-2017 "Degrees of Protection Provided by Enclosures (IP Code)".
At the same time, it is necessary to evaluate the durability of the instrument's casing, such as applying mechanical impact, vibration, etc., and observe whether the casing is damaged or deformed.
5、 Safety and Compliance
Electrical safety testing:
The instrument should comply with relevant electrical safety standards, such as withstand voltage testing, leakage current testing, insulation resistance testing, etc.
During inspection, testing must be conducted in accordance with standards such as GB4943.1-2011 "Information Technology Equipment Security Part 1: General Requirements".
Electromagnetic compatibility testing:
The instrument should be able to operate normally in an electromagnetic interference environment without generating excessive electromagnetic interference.
During inspection, it is necessary to conduct conducted interference tests, radiation interference tests, etc. to ensure that the instrument meets relevant electromagnetic compatibility standards.
Hazardous substance detection:
The instrument should not contain harmful substances such as heavy metals such as lead, mercury, cadmium, as well as organic compounds such as polybrominated biphenyls and polybrominated diphenyl ethers.
During inspection, chemical analysis methods should be used to detect the content of harmful substances to ensure that the instrument meets relevant environmental standards.