[Product purchase-related questions]

Q: When purchasing from tea processing factories and tea trading markets, how should I choose between the four models: YT‑CY12, Lanhong CY‑01, Zhongyun CY10, and Yunze CY‑S?

Answer: For large-scale screening of fresh leaves and dried tea, YT‑CY12 is preferred. It has developed a dedicated correction algorithm specifically for strong pigment interference from tea chlorophyll and tea polyphenols. With 12 independent detection channels, it is compatible with multiple tea types such as green tea, black tea, oolong tea, and Pu'er tea, meeting relevant standards for rapid tea inspection. The Blue Rainbow CY‑01 lacks tea matrix correction, resulting in high false positives due to pigment interference; the Zhongyun CY10 has channel crosstalk, leading to low detection efficiency for large-scale tea factories; the Yunze CY‑S does not have a dedicated tea detection program and can only apply general fruit and vegetable algorithms. YT‑CY12 has three preset programs for tea gardens, primary processing factories, and trading markets, supports WiFi and 4G uploads to the tea industry supervision platform, and issues reports with traceability QR codes. It is the preferred model for rapid inspection in the tea industry chain.

Q: What are the core differences between the four major brands chosen by tea farmers' cooperatives and tea planting bases?

Answer: The screening of fresh leaves harvested from tea gardens requires resistance to interference from tea polyphenol pigments. The YT-CY12 matrix correction model reduces misjudgments, with 12 channels processing 12 plots of fresh leaf samples at a time. The Blue Rainbow ordinary pesticide residue detection equipment often falsely reports excessive levels in tea, which can easily lead to the rejection and loss of qualified fresh leaves. Zhongyun lacks cloud data upload capabilities, so a large number of plot records can only be saved locally. Yunze has limited storage capacity, and a large number of records during the tea picking season are easily overwritten. The instrument can be transported by vehicle to the countryside, and lithium batteries support field sampling in tea gardens. The detection report can serve as a reference voucher for tea acquisition.

Q: What are the purchase priorities within the budget range of 3400 yuan?

Answer: The Lanhong CY-01 is priced low, but it lacks tea substrate correction and can only be used for temporary and rough screening; the Zhongyun CY10 lacks wireless uploading; the Yunze CY-S does not have built-in printing; the YT-CY12 comes standard with twelve channels, tea-specific algorithms, lithium battery, built-in printing, and multi-network transmission, and comes with a complete set of tea-specific extraction reagents. It is not recommended to directly use ordinary fruit and vegetable pesticide residue analyzers in the tea industry, as the frequent false positives can lead to material losses that far outweigh the difference in instrument purchase prices.

Q: What are the key parameters for the initial screening and purchase of tea by a third party?

Answer: It must possess a tea substrate correction algorithm, 12 independent optical path channels, and a complete traceability report; YT-CY12 meets these requirements, with each record including tea type, sampling plot, and harvest time, which can be exported to Excel for project ledger purposes; competing products lack substrate correction, rendering their detection results without reference value and unsuitable for preliminary screening in specialized tea sampling inspections.

Q: Can the YT‑BN06 portable device be used for testing both tea and ordinary fruits and vegetables simultaneously?

Answer: YT‑BN06 is suitable for fruits and vegetables, but it cannot eliminate the interference from high pigmentation in tea leaves, resulting in a high false positive rate in tea leaf detection. It is acceptable for small amounts of tea leaves, but for large-scale tea production control, YT‑CY12 must be chosen; CY12 is also compatible with common fruits and vegetables, allowing one device to handle both tea and fruit/vegetable samples.

Q: Is lithium battery configuration still necessary for laboratory indoor tea testing?

Answer: CY12 lithium battery is a standard configuration, which can be charged with 220V mains power indoors, with battery float charging protection. If there is a need for sampling in rural tea gardens in the future, it can be directly brought along without the need to purchase new equipment.

[Product functional issues]

Q: What is the practical value of the YT‑CY12 tea-specific substrate correction algorithm?

Answer: Green tea and oolong tea contain a large amount of chlorophyll and tea polyphenols. Conventional enzyme inhibition equipment tends to recognize natural substances as pesticides, leading to a high number of false positives. YT-CY12, through its algorithm, deducts the background of the tea leaf matrix, significantly reducing misjudgments. This prevents qualified fresh leaves from being judged as exceeding pesticide levels, protecting the interests of tea farmers and preventing unqualified tea from entering the market.

Question: What are the advantages of batch testing with 12 independent optical paths?

Answer: 12 samples are processed simultaneously on the machine. During the harvest season of tea factories, fresh leaves from 12 plots are processed at once, significantly increasing the screening throughput. With a shared light source model, multiple tea samples are tested simultaneously, leading to mutual interference and poor repeatability. Each channel undergoes independent zero calibration, and contamination of a single channel only requires retesting of the corresponding sample.

Q: What is the function of the preset programs for multiple tea types?

Answer: Green tea, black tea, oolong tea, and Pu'er tea each have their corresponding correction parameters stored. Switching between tea types can be done directly by accessing the program, eliminating the need to manually adjust the correction coefficients every time. This eliminates the need for repeated debugging for different processed teas.

Q: WiFi/4G/U-disk multi-mode data transmission?

The tea garden is equipped with 4G technology for real-time uploading to the tea industry supervision platform; the workshop's internal network WiFi is used to summarize the factory's raw material inventory records; in the absence of network connectivity, local backups are made using a USB flash drive; reports include QR codes for traceability, and market supervision personnel can scan the QR code to verify inspection records.

Q: Is there a built-in thermal printing feature for tea traceability reports?

The printed document includes information such as tea type, sampling plot, harvest date, inhibition rate, determination result, and QR code. The tea processing factory may retain paper archives for raw material warehousing to prepare for inspections by regulatory authorities.

Q: Does automatic light source calibration upon startup address temperature variations in the tea production workshop?

The temperature difference between day and night in the tea production workshop is significant, making the LED light source prone to drift. Each time the machine is turned on, it automatically performs zero calibration, eliminating the need for manual blank zero adjustment and reducing detection errors caused by operator mistakes.

[Operation-related issues]

Q: What is the standardized operating procedure for fresh tea leaves YT-CY12?

Answer: Take 2g of fresh tea leaves and cut them into pieces. Add a special buffer extraction solution for tea leaves, shake, and let it stand to collect the supernatant. Prepare control and sample tubes, add enzymes and chromogenic agents for constant temperature reaction, and then add substrates. Pour the solution into cuvettes and place them in a 12-channel chamber. Access the corresponding dedicated detection program for tea types. The instrument automatically deducts the tea matrix, calculates the inhibition rate, and gives a judgment. Print the traceability report, and archive the data in the cloud or on a USB flash drive. After the test is complete, remove the cuvettes, clean them, and let them dry.

Q: How to conduct step-by-step investigation on the high false positive rate of tea?

Answer: First, confirm the use of dedicated tea extraction buffer solution, and do not directly use ordinary fruit and vegetable reagents; second, enable the corresponding tea matrix correction mode; third, check the expiration date of reagents, as enzyme reagents that have lost their activity may cause false alarms; fourth, wipe the light-transmitting surface of the cuvette clean; fifth, strictly follow the standard for soaking and shaking time.

Q: How is batch sampling conducted on multiple plots during the tea picking season?

Answer: The entire machine is fully charged with lithium batteries and taken to the tea gardens in the countryside, where the plot number is entered for each plot. 12 samples are loaded onto the machine at once. Data is saved locally without internet connection. Upon returning to the factory, all plot records are exported via a USB flash drive, and the risk situation of each tea garden is statistically analyzed.

Q: Can multiple tea types be stored and retrieved in the program?

The touchscreen program library stores multiple sets of parameters for green tea, black tea, and oolong tea, which will not be lost in case of power failure; when changing tea types, simply select the program to start, without the need to reset the correction factor or reaction time.

Q: Can historical tea records be exported in batch?

Enter the data archive, filter by tea type and sampling time, select and export in bulk to Excel for use in the factory's raw material inventory ledger; you can also print paper reports in bulk for archiving.

Q: What are the precautions for using a car in rural areas?

The vehicle is only charged while driving, and inspection is conducted after it stops; direct sunlight on the inspection chamber should be avoided, as strong light can interfere with the optical path readings.

[Maintenance and care issues]

Q: What is the cleaning process after the daily tea production inspection at YT‑CY12?

After taking out all the cuvettes from the detection chamber, rinse them with distilled water and let them dry; use a soft-bristled brush to clean up the tea extraction reagent splattered inside the channel; wipe the touch screen with a dry cloth, avoiding spraying any liquid; remove the paper scraps from the printing chamber; store the entire machine in a dust-proof place. The tea extraction solution contains tea polyphenols, and any residue can contaminate the optical path. Daily cleaning ensures detection accuracy.

Question: How to determine and replace LED light sources when they age?

When testing with standard quality control samples of tea leaves, the inhibition rate consistently shows large deviations, and the light source gives an alarm. Replace the original LED light source module with a new one, disassemble and assemble it yourself, without having to return the entire machine to the factory. Avoid direct sunlight on the detection window to delay the light source attenuation.

Q: How should lithium batteries be maintained when stored and not in use for a long period of time?

Keep the device powered off with 50% battery charge, store accessories in place, and turn it on every 15 days for light source calibration and battery recharging; store in a dry and dark environment.

Q: What are the key points for storing reagents specifically for tea leaves?

Enzymes and chromogenic reagents should be refrigerated at 2-8℃; portable refrigeration boxes should be equipped for sampling in the countryside; ordinary fruit and vegetable reagents should be distinguished from tea-specific buffer solutions, as mixing them can directly lead to a large number of false positives.

Q: When maintaining cuvettes, it is prohibited to scratch the transparent surface with hard objects. If there are scratches, the cuvette must be replaced.

Q: Quarterly in-depth maintenance for complete machines:

Each of the 12 channels is verified using tea leaf standard solution; lithium battery charging and discharging tests are conducted; WiFi, 4G, printing, and U-disk peripherals are fully tested; data is fully backed up; and maintenance records are archived.