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The core technical principle of the MacLehose turbidity meter has blossomed and yielded results in multiple fields
Date: 2025-12-13Read: 1
In the daily work of microbiology laboratory, rapid and accurate determination of bacterial solution concentration is a key link to ensure the success of experiments. As an optical density measuring instrument based on McFarland units, the McFarland turbidity meter has become an indispensable professional tool for researchers and laboratories due to its precise measurement principle and convenient operation characteristics.
Core technical principle: precise application of light scattering method
The core working principle of the MacLehose turbidity meter is based on the Lambert Beer law, and rapid determination of microbial concentration is achieved through photoelectric sensing technology. The instrument has a built-in LED light source that emits a specific wavelength of light beam. When the light penetrates the suspension of the tested bacteria, the bacterial particles in the water sample will scatter the incident light. The scattered light intensity detected at a 90 degree angle is proportional to the concentration of microorganisms in the bacterial suspension. The light signal is received by a photoelectric sensor and converted into an electrical signal. After circuit amplification and microcomputer data processing, it is directly displayed as the McF turbidity unit (MCF value).
This measurement method can accurately capture subtle changes in bacterial solution concentration, covering a measurement range of 0.0-5.0 McFarland units, corresponding to a microbial concentration range of 0-150 × 10 ^ 7 cells/ml. The resolution can reach 0.001 MCF, and the repeatability error is ≤ 1%, ensuring the reliability and consistency of experimental data.
Widely applicable fields
The Marsh turbidity meter plays an important role in multiple fields. In clinical testing, it is used to standardize bacterial solution concentration and ensure the accuracy of drug susceptibility testing; In the field of industrial fermentation, real-time monitoring of bacterial growth status can help optimize the fermentation process; Provide reliable methods for rapid screening in microbial identification; In antibiotic sensitivity testing, the degree of microbial response to antibiotics can be quickly evaluated. In addition, the instrument can also be used for absorbance measurement and color solution concentration estimation, providing a convenient tool for dye or indicator concentration detection in microbial experiments.
Convenient operation and intelligent design
The modern MacLehose turbidity meter adopts a brand new Android intelligent operating system, equipped with an 8-inch high-definition color LCD touch screen and a user-friendly Chinese operation interface, making the reading intuitive and simple. The instrument supports one click measurement and can output results in 6 seconds, greatly improving detection efficiency. Simultaneously equipped with wireless communication function, supporting WIFI, RJ45, mobile hotspot network transmission, detection data can be exported through USB flash drive, andall alongStore 8 million sets of data for users to easily query and analyze historical records.
The instrument adopts a precision colorimetric cell design and uses consistent light sources, effectively solving the problem of detection result deviation caused by light source errors. The light source adopts imported ultra high brightness light-emitting diodes, and the brightness can be automatically adjusted and calibrated to ensure the accuracy of measurement results. In addition, the instrument also supports HDMI output, making it convenient for users to train and explain. The built-in thermal line printer can print test results at any time.
Precautions for use
To ensure the accuracy of the measurement results, it is important to note when using a MacLehose turbidity meter that the sample should be thoroughly mixed to avoid bacterial aggregation affecting turbidity; Avoid the generation of bubbles during measurement; Different bacterial strains have differences, and Gram positive bacteria are more prone to aggregation than negative bacteria, requiring additional homogenization treatment; The instrument needs to be calibrated regularly and validated using a standard turbidity tube; The colorimetric tube should be stored away from light to prevent precipitation of barium sulfate. In addition, the operating environment should be kept stable to avoid direct sunlight or drastic temperature changes that may affect the measurement results.
The MacLehose turbidity meter has become the mainstream equipment in the field of microbial concentration detection due to its high accuracy, fast and convenient operation, and simple operation. Whether it is clinical testing, scientific research and teaching, or industrial production, this instrument can provide users with reliable and accurate solutions, and is a powerful assistant to improve work efficiency and ensure the reliability of experimental results.