Fully Automatic Kjeldahl Nitrogen Analyzer Model: JK9870B

Product Application:

The Kjeldahl method is a classic method for determining nitrogen. It is currently widely used for determining nitrogen-containing compounds in soil, food, animal husbandry, agricultural products, feed, and other applications. This method requires three steps: sample digestion, distillation separation, and titration analysis.

The JK9870 series fully automatic Kjeldahl nitrogen analyzer is a nitrogen (protein) analysis system developed based on the classic Kjeldahl method. It utilizes fully automatic distillation and titration technology, with a colorimetric endpoint determination method. Its methods and manufacturing procedures comply with the "GB/T 33862-2017 Fully (Semi) Automatic Kjeldahl Nitrogen Analyzer" manufacturing standard and relevant international standards.

Reliable Actuation System:

· Utilizes R, G, and B color sensors for a wide color range, high accuracy, and fast response.

· A plunger-type titration pump, comprised of a German-made linear motor and syringe, offers high control accuracy and excellent stability.

· Metal (304 stainless steel) steam boiler: Stable, reliable, and pressure-resistant.

Safety Protection Systems:

· Leakage protection system prevents leakage and electric shock, ensuring operator safety.

· If the digestive tube is missing, the system will not add reagents or heat, preventing injuries from reagents or steam.

· If the safety door is not closed, the system will not operate. A 5mm thick transparent safety door ensures personal safety.

· Automatic shutdown and alarm for water shortages in the steam system, preventing accidents.

· Automatic shutdown and alarm for overheating of the steam boiler.

· Alarm and shutdown for overpressure, preventing accidents.

· Sample overtemperature alarm prevents sample temperature increases that could affect analytical data.

· Safe alkali addition mode reduces the risk of strong reactions during alkali addition, preventing tube bursts.

Convenient Operating System:

· The embedded operating system, with proprietary intellectual property rights, features a 10-inch color touchscreen and a Chinese-character interactive menu, making operation simple and easy to learn.

· Automatic power-off function: The system automatically shuts down after 60 minutes of unattended operation, ensuring energy conservation, safety, and peace of mind.

· Operation instructions, reagent preparation, precautions, and maintenance information are displayed on the screen for easy access.

· Three titration curves (R, G, and B) allow you to monitor sample changes during the titration process, providing assistance during analysis.

· Titration accuracy verification ensures the accuracy of analytical data.

· The exposed titration beaker allows you to observe the titration process. The instrument features a built-in protein coefficient lookup table for easy access, querying, and system calculations.

Automatically uploads and inputs sample weighing data, reducing the tedious manual input and potential errors.

16MB of data storage allows for storage of 100,000 sample records for user review, and a 5.7cm thermal printer with automatic paper cutter is included.

99 user-defined program (recipe) management system.

Stored data can be exported via the instrument's USB port for storage, editing, and use on a computer.

Multi-function interface connects to the cooling system and reagent tank level sensor.

Product Features:

«  This fully automatic Kjeldahl nitrogen analyzer, which requires no tap water and is equipped with a highly efficient refrigerated water circulation system, is controlled by the nitrogen analyzer main unit for energy efficiency, environmental friendliness, and excellent stability.

«  The internal standard titrant concentration eliminates systematic errors caused by discrepancies between human and instrument judgment, resulting in high accuracy and convenience.

«  Automatic power-off function: The system automatically shuts down after 60 minutes of unattended operation, ensuring energy efficiency, safety, and peace of mind.

«  Automatic upload and input of sample weighing data reduces the tedious manual input and the risk of errors.

·Distillation-while-titration mode: Distillation and titration are performed simultaneously. When the titration reaches the endpoint, distillation ends simultaneously, saving analysis time.

·Automatic digestion wastewater discharge reduces operator workload.

·Steam flow rate is adjustable from 50% to 100% to accommodate samples of varying concentrations.

·The steam system provides constant pressure steam flow for excellent stability and safety.

·Automatic alkali line cleaning during shutdown prevents blockage and ensures liquid supply accuracy.

·Cooling water flow monitoring prevents sample loss due to insufficient cooling water flow, which can affect analysis results.

·Delayed analysis allows measurement of nitro-containing samples.

Technical Specifications:

· Analysis Range: 0.1-240 mg N

· Precision (RSD): ≤0.5%

· Recovery (or error of indication): ≥99.5% (±0.5%)

· Titration Accuracy: 0.75 μL/step

· Sample Analysis Time: 4-6 min (cooling water temperature 18°C)

· Titrant Concentration Range: 0.01-5 mol/L

· Titrant Concentration Input Method: Manual Entry/Instrument Internal Standard

· Titration Mode: Standard/Steaming and Titration

· Touch Screen: 10-inch Color LCD

· Data Storage: 100,000 Data Sets

· Printer: 5.7cm Thermal Printer with Automatic Cutter

· Communication Interfaces: 232/Network/Cooling Water/Reagent Level; Computer Operating System

· Digestive System Waste Discharge Mode: Manual/Automatic (5-99 seconds)

· Delayed analysis: Response time 0-2 hours

· Steam flow adjustment: 50%-100%

· Safety alkali addition mode: 0-999 seconds

· Automatic shutdown time: 60 minutes

· Operating voltage: AC220V/50Hz

· Heating power: 2000W

· Dimensions: 500*460*710mm

· Net weight: 36kg

JK9870B Product Configuration:

· Host 1 unit

· Reagent barrels 3

· Waste liquid collection container 1

· 1L titrant bottle 1

· Refrigeration circulation system 1 unit

· Printer paper 8 rolls

· Reagent tubing 4

· Cooling water inlet and outlet pipes 1 each

· Power cord 1

· M19 open handle 1

· Communication cables 2

· Computer operating software (USB flash drive) 1