Nitrite tester

 Instrument Introduction:

The nitrite rapid detection instrument in food is an integrated food safety detection and analysis equipment that can quickly detect the nitrite content in meat, canned meat, smoked meat, sausages, dairy products, pickles, pickled vegetables, etc; This instrument is based on GB5009.33-2010 "Determination of Nitrite and Nitrate in Food". Nitrite in food is extracted and reacts with detection reagents to generate colored compounds. Its absorbance is then measured using a nitrite detector, and within a certain range, the absorbance is directly proportional to the content. By testing, it can be determined whether the food meets national standards or whether it is toxic beyond the standard. The instrument reserves other project detection programs and ports, and can easily add detection items according to future needs. In the future, it can be upgraded to a comprehensive type of instrument for detecting aquatic and noodle products.

Instrument application:

Widely used in catering inspection, food and drug administration, health departments, meat product deep processing enterprises, shopping malls and supermarkets, quality supervision and inspection, industrial and commercial management, fried food production bases, major food safety monitoring systems, and other units.

Function Introduction:

1. The Android intelligent operating system adopts more efficient and user-friendly operation. The instrument has network cable connection, WiFi networking upload, GPRS wireless remote transmission function, and can quickly upload data.

2. Integrated portable rapid inspection equipment, meeting the needs of on-site and mobile detection, can achieve the detection of all detection items under the same software, and can visually display the detection results through the same window.

3. High level of intelligence, the instrument has self checking function: it has startup self checking and zero adjustment functions, and automatic detection of repeatability.

4. Detection channels: ≥ 12 detection channels, capable of testing multiple samples simultaneously. Each sample is controlled by a program and operates independently without mutual interference.

5. Display method: ≥ 7-inch LCD touch screen display, user-friendly Chinese operation interface, intuitive and simple reading.

6. Equipped with a new generation embedded thermal printer, it can be manually printed or automatically printed. After the detection is completed, the detection report and QR code can be automatically printed.

7. The light source adopts imported ultra-high brightness light-emitting diodes, which have high precision, strong stability, controllable light source, and can turn off unused light sources, resulting in lower power consumption.

8. Adopting USB2.0 interface design, it is convenient for data storage and movement, and can be directly connected to a computer at any time, and can be used to control instruments by a computer. Implement data query, browsing, analysis, statistics, printing, etc.

9. The instrument has a menu library of multiple types of samples, allowing for flexible selection of testing samples. Different testing channels can simultaneously test different sample items.

10. The sample processing is simple and labor-saving, and the overall operation is fast, safe, and convenient.

11. The instrument has its own protection function, which can be set with a username and password to prevent non staff operations.

12. High sensitivity, high detection accuracy, high repeatability accuracy, scanning type high-precision optical sensor.

13. The instrument has functions of recalibration, locking, and restoring factory settings.

14. The result judgment line can be modified, the calibration value of the reference value can be saved, and data will not be lost after power outage.

Main parameters:

1. The main control chip adopts ARM Cortex-A7, RK3288/4 core processor, with a main frequency of 1.88GHz, faster operation speed, and stronger stability.

2. Display method: 7-inch LCD touch screen display, user-friendly Chinese operation interface, intuitive and simple reading.

3. DC 12V power supply, can be connected to car power supply, and can be equipped with a 6Ah large capacity rechargeable lithium battery, convenient for outdoor flow testing.

4. Dual wavelength cold light source, equipped with 405 and 528nm wavelength light sources for each channel, equipped with advanced optical path switching devices as standard. The patented optical path switching function can achieve up to 64 wavelengths, and all detection items can achieve simultaneous detection of all channels.

5. Automatic adjustment and calibration of light source brightness

6. Intelligent constant current voltage regulation, automatic calibration of light intensity, long-term continuous operation of the light source without temperature drift phenomenon.

7. Built-in new national limit standards, on-site comparison with measured results, and continuous updating of standards.

8. Continuous injection and detection

9. Sample numbers are automatically accumulated.

10. The detection items can be expanded.

11. The detection results can be printed and uploaded in batches.

12. The test results are in an Excel spreadsheet, which can be copied by connecting to a computer.

13. Supports USB storage, standard USB interface, and driver free installation.

14. Configurable large capacity lithium battery, firmware upgradable

 Technical parameters:

1. Lower limit of nitrite detection: 1mg/kg

2. Linear range of nitrite: 1-500mg/kg

3. Accuracy error: ± 3%

4. Linear error: ± 5 ‰

5. Stability: ± 0.001 A/hr

6. Wavelength accuracy:<2.0nm

7. Absorbance range: 0.000-4.000 ABS

 Operation steps:

1. Sample pretreatment:

① Weigh 0.5g (0.5ml) of ground sample into a test tube, add purified water to the 25ml mark;

② Ultrasound extraction for 5 minutes, filter for backup. (If the color is darker, 0.5g of activated carbon can be added, heated in a 60 ℃ water bath for 10 minutes, and then filtered while hot)

2. Control sample testing

① Take 3mL of sample solution and add 0.5mL of purified water;

② After shaking well, transfer 2.5ml into a colorimetric dish;

③ Place the colorimetric dish in the designated channel and press "Control measurement"

3. Sample testing

① Take 3mL of sample detection solution and add 0.5mL of nitrite detection solution;

② Leave at room temperature (25 ± 5 ℃) for 10 minutes;

③ Transfer 2.5ml into a colorimetric dish;

④ Place the colorimetric dish in the designated channel and press "Sample Measurement"