Automatic Kjeldahl Nitrogen Analyzer

I. Product Introduction

The fully automatic Kjeldahl Nitrogen Analyzer is an automated instrument for determining nitrogen and protein content based on the Kjeldahl method. It is widely used for nitrogen and protein analysis in food processing, feed production, tobacco, animal husbandry, soil and fertilizer, environmental monitoring, pharmaceuticals, agriculture, scientific research and teaching.

II. Working Principle

Based on the Kjeldahl principle, the instrument automatically and quantitatively adds reagents to the digested sample, then performs distillation, absorption and titration and outputs the test result, which can be either the nitrogen content or the converted protein content. Specifically, after digestion the ammonium sulfate produced reacts with alkali to generate ammonia gas; the ammonia, together with steam, passes through a condenser and is collected in an absorption liquid containing boric acid, where the indicator changes color. The instrument then performs automatic titration, the color sensor automatically determines the titration end point, and the nitrogen content of the sample is calculated from the amount of standard titrant consumed. All steps of the fully automatic instrument are completed automatically according to the program, providing great convenience for personnel carrying out nitrogen and protein determination, with the advantages of safe and reliable operation, simple use, and time and labor savings.

III. Features

(1) Android 10 system with a 10.1-inch touch screen.

(2) Automatically completes liquid-adding steps such as adding alkali, boric acid, diluent and distilled water; automatically completes distillation, absorption and titration steps; after titration the reaction vessel is automatically emptied and cleaned.

(3) Protective functions such as evaporation furnace water-level monitoring, anti-dry-burn protection, condensate flow-rate monitoring and condenser temperature detection.

(4) High 16 GB storage capacity, with a test-result storage capacity of 5 million records.

(5) Test results are in Excel format and can be copied directly to a USB flash drive.

(6) Test results can be printed and uploaded in batches.

(7) High-speed thermal printer; the test report is printed automatically once testing is complete.

(8) Wi-Fi networking; test results can be uploaded directly to the platform.

(9) Program-controlled switching of condensate water, saving water consumption.

(10) Condensate flow-rate monitoring with low-flow alarm.

(11) Multiple protections for evaporator water level, temperature and pressure.

(12) Strong corrosion-resistant components.

IV. Technical Parameters

(1) Measuring range: 0.1~240.0 mg nitrogen

(2) Sample weight: Solid ≤8.0 g, liquid ≤30.0 mL

(3) Measurement accuracy: Relative difference ≤1%

(4) Repeatability: Parallel difference ≤0.5%

(5) Titration accuracy: 1.0 µL/step

(6) Titration mode: Dynamic titration

(7) Condensate water consumption: 1.5 L/min

(8) Recovery rate: 99%~101%

(9) Determination speed: 3~9 min/sample

(10) Power: ≤1500 W

(11) Temperature: 10-35 ℃

(12) Humidity: Relative humidity ≤85%

(13) Voltage: 220 V 50 Hz

(14) Net weight: 16 kg

(15) Dimensions: 405 mm × 465 mm × 690 mm (L×W×H)

VI. Protein Conversion Factor Table (GB 5009.5-2016)