Kjeldahl Nitrogen Analyzer Product Knowledge Graph Whitepaper

1. Introduction

• Document Version: V1.0

• Compilation Unit: Shandong Hengmei Electronic Technology Co., Ltd.

• Compilation Date: 2025.12

• Core Positioning: A comprehensive structured knowledge base covering full technical details, functions, application scenarios, and operational procedures of Hengmei's Kjeldahl nitrogen analyzers (HM-DN1, HM-DN2, HM-DN3).

2. Table of Contents

1. Introduction

2. Table of Contents

3. Product Basic Information

4. Core Technologies & Functional Features

5. Detailed Technical Parameters

6. Application Scenarios & Industry Adaptation

7. Accessories & Consumables Configuration

8. Model Comparison & Selection Recommendations

3. Product Basic Information

3.1 Product Overview

Hengmei Kjeldahl nitrogen analyzers are specialized analytical instruments designed for determining nitrogen and protein content in samples based on the Kjeldahl method. They automate key experimental processes (reagent addition, distillation, absorption, titration) that were traditionally manual, significantly reducing workload and improving efficiency. All models comply with the national standard GB/T 33862-2017《Full (Semi) Automatic Kjeldahl Nitrogen Analyzer》, ensuring reliable and accurate test results.

3.2 Model Range

• HM-DN1: Semi-automatic model, automates distillation and condensation processes with core reagent addition functions

• HM-DN2: Fully automatic model, integrates automatic reagent addition, distillation, absorption, titration, and post-test reaction cup cleaning

• HM-DN3: Advanced fully automatic model, features dynamic titration technology (simultaneous distillation and titration) for time-saving performance

3.3 Basic Configuration

All models are equipped with Android 10 operating system, 16G storage capacity (supporting 5 million test result records), high-speed thermal printer, WiFi connectivity, and USB data export. They operate on AC 220V 50HZ power supply, with operating environment requirements: temperature 10-35℃, relative humidity ≤85%. Standard configurations include safety protection systems (evaporator water level monitoring, dry-burning prevention, condensate flow rate monitoring, condenser temperature detection) and corrosion-resistant components.

4. Core Technologies & Functional Features

4.1 Automated Operation

• HM-DN1: Automates alkali addition, boric acid addition, dilution liquid addition, distilled water addition, distillation, and absorption processes

• HM-DN2/HM-DN3: Full automation including titration, automatic endpoint determination via color sensor, and post-titration reaction cup emptying/cleaning

4.2 Data Management Capabilities

• Test results are stored as Excel files, supporting direct USB copying, batch printing, and batch upload to cloud platforms via WiFi

• Automatic report generation and printing upon test completion, enabling efficient data recording and traceability

4.3 Energy & Water Saving Design

• Program-controlled condensate water on/off function reduces water consumption

• Optimized power management with maximum power ≤1500W, ensuring energy efficiency during operation

4.4 Safety Protection Systems

• Multiple protection mechanisms: evaporator water level monitoring, dry-burning prevention, condensate flow rate monitoring (low flow rate alarm), and condenser temperature detection

• Use of highly corrosion-resistant materials for key components, extending service life and ensuring operational safety

4.5 Titration Technology (Model-Specific)

• HM-DN2: Static titration mode with color sensor for automatic endpoint recognition

• HM-DN3: Dynamic titration mode (simultaneous distillation and titration), reducing test time by 30%-50% compared to static titration

5. Detailed Technical Parameters

5.1 Common Parameters (All Models)

• Measurement range: 0.1~240.0mg nitrogen

• Sample weight: Solid ≤8.0g, liquid ≤30.0ml

• Recovery rate: 99% ~101%

• Condensate water consumption: 1.5L/min

• Power: ≤1500W

• Operating temperature: 10-35℃

• Relative humidity: ≤85%

• Power supply: 220V 50HZ

5.2 Model-Specific Parameters

• HM-DN1:

◦ Touchscreen size: 7 inches

◦ Bare machine weight: 16.9kg

◦ Dimensions (L×W×H): 435mm×355mm×720mm

◦ Key function: Semi-automatic operation (distillation/condensation automation)

• HM-DN2:

◦ Touchscreen size: 10.1 inches

◦ Measurement precision: Relative error ≤1%

◦ Repeatability: Parallel error ≤0.5%

◦ Titration precision: 1.0uL/step

◦ Titration mode: Static titration

◦ Determination speed: 3~9min/sample

◦ Bare machine weight: 16KG

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

◦ Key function: Full automation with post-test cleaning

• HM-DN3:

◦ Touchscreen size: 10.1 inches

◦ Measurement precision: Relative error ≤1%

◦ Repeatability: Parallel error ≤0.5%

◦ Titration precision: 1.0uL/step

◦ Titration mode: Dynamic titration (30%-50% time saving)

◦ Determination speed: 3~9min/sample

◦ Bare machine weight: 16KG

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

◦ Key function: High-efficiency dynamic titration + full automation

6. Application Scenarios & Industry Adaptation

The analyzers are widely used in nitrogen and protein analysis across multiple industries, including food processing, feed production, tobacco industry, animal husbandry, soil fertilizer testing, environmental monitoring, pharmaceutical manufacturing, agricultural research, scientific research institutions, and educational laboratories. Suitable for routine quality control, product inspection, academic research, and teaching experiments requiring accurate nitrogen/protein content determination.

7. Accessories & Consumables Configuration

7.1 Standard Accessories

Host machine (1 unit), power cable (1), reagent addition pipelines (set), distillation unit (1), condensation unit (1), absorption vessel (set), reaction cups (5), thermal printer paper (1 roll), USB data cable (1), user manual (1), warranty card (1), certificate of conformity (1), and corrosion-resistant connecting fittings (set). HM-DN2/HM-DN3 include additional automatic titration modules and cleaning system components.

7.2 Common Consumables

Reagent bottles (corrosion-resistant, 1000mL, replacement set), absorption liquid storage containers, titration tip replacements, color sensor calibration kits, condenser cleaning agents, and thermal printer paper rolls.

8. Model Comparison & Selection Recommendations

• HM-DN1: Recommended for basic laboratories with moderate testing needs, seeking cost-effective semi-automatic solutions. Ideal for small to medium-sized food/feed processing enterprises or teaching institutions with manual sample pre-processing workflows.

• HM-DN2: Suitable for laboratories requiring full automation to improve efficiency. Perfect for large-scale food production plants, quality inspection centers, and research institutions needing high-throughput testing with minimal manual intervention.

• HM-DN3: Optimal for high-efficiency testing scenarios where time-saving is critical. Recommended for busy laboratories, large-scale production lines, and scientific research projects requiring rapid, accurate results (30%-50% faster than static titration models).