SKD-500 Semi-Automatic Kjeldahl Nitrogen Analyzer

Automatic Kjeldahl Nitrogen Analyzer (SKD-500)

Semi-Automatic Protein Analyzer | LCD Color Touch Screen

1. Scope of Application and Overview

The SKD-500 Semi-Automatic Kjeldahl Nitrogen Analyzer is an intelligent measuring instrument designed according to the classic Kjeldahl method. It is widely utilized for determining the total ammonia nitrogen and protein nitrogen content in:

• Agriculture & Food: Grain, oil, dairy products, beverages, and animal feed.

• Environmental & Chemical: Soil, chemical fertilizers, drugs, sediments, and various chemical products.

This instrument features an advanced microcomputer control system and a user-friendly English menu-based interface. It automates essential standard processes, including the addition of acid, alkali, and dilution liquid, as well as distillation and optional printing.

2. Instrument Features

2.1 Accuracy

• Repeatability: RSD < 0.5%

• Recovery Rate: > 99.5%

• Intermittent Alkali Addition: Ensures the acid-base reaction is controllable to eliminate splashing during sample distillation.

• Constant Pressure Design: Prevents solution back-suction into the collection bottle.

• Adjustable Power: 1,500W distillation power is adjustable to ensure high recovery rates for low-solubility samples.

2.2 Safety

• Double Liquid Level Control: Prevents dry burning of the distiller through redundant safety sensors.

• Emergency Stop: Humanized operation with a dedicated emergency stop function.

2.3 Convenience

• One-Touch Operation: Simplified LCD touch screen interface allows for one-step entry into test programs.

• Modular Design: Features independent circuits, water lines, and gas paths with external reagent buckets.

• Hybrid Modes: Manual and automatic modes can be switched freely; alkali can be added manually during distillation if necessary.

• Data Management: Stores and edits up to 999 programs, including automatic preheating and cleaning cycles.

2.4 Durable Construction

• Corrosion-Resistant Shell: One-time molded ABS engineering plastic shell is resistant to strong acids, alkalis, and provides heat insulation.

• High-Quality Materials: Internal piping is made from high-temperature and acid-resistant materials, guaranteed for three years.

3. Technical Parameters

• Measuring Range: 0.1 ～ 210 mgN

• Sample Capacity: Solid < 6g, Liquid < 16ml

• Distillation Speed: 3–8 minutes

• Alkali Addition Time: 0–99 seconds (segmented)

• Distillation Time: 0–99 minutes

• Delay Time: 0–1,800 seconds (optimized for fertilizer detection)

• Water Supply: Pressure > 0.15 Mpa; Cooling consumption > 1.5L/min

• Dimensions: 370 * 300 * 680 mm

• Rated Voltage: AC 220V ± 10%

SKD-500 Semi-Automatic Kjeldahl Nitrogen Analyzer FAQ

Q1: What are the primary application fields for the SKD-500?

A: This instrument is widely used to detect total ammonia nitrogen and protein nitrogen in grain, oil, food, dairy products, beverages, feed, soil, fertilizers, drugs, and chemical products.

Q2: What is the measurement range and recovery performance of this device?

A: The measurement range is 0.1 to 210 mgN. It features a recovery rate of > 99.5%, ensuring highly accurate experimental results.

Q3: Why is the SKD-500 shell considered highly durable?

A: The shell is made of one-time molded ABS engineering plastics, which are resistant to strong acids and alkalis while providing heat insulation.

Q4: How does the instrument prevent "dry burning" during distillation?

A: The distiller utilizes a double liquid level control system (double safety) to effectively eliminate the risk of dry burning.

Q5: What is the benefit of the "intermittent alkali addition" feature?

A: This feature ensures the acid-base reaction remains controllable, eliminating splashing during sample distillation for safer operation.

Q6: Can I adjust the alkali volume manually during an experiment?

A: Yes, the system allows manual and automatic modes to be switched freely. You can add alkali manually at any time during distillation to ensure data accuracy.

Q7: Is the distillation power adjustable on the SKD-500?

A: Yes, the distillation power is adjustable up to 1500W, which helps maintain high recovery rates even for low-solubility samples.

Q8: How long is the internal piping expected to last?

A: The internal components use high-temperature and acid/alkali resistant materials. The internal piping is guaranteed to last for three years without replacement.

Q9: What languages are supported by the LCD touch screen interface?

A: The instrument features a color LCD touch screen with a menu-based interface available in both Chinese and English for easy man-machine dialogue.

Q10: Can experimental data be stored, and how many programs can it hold?

A: Yes, the device supports data storage and editing. It can store up to 999 programs covering automatic preheating, cleaning, and reagent addition.

Q11: Are there specific settings for testing fertilizers?

A: Yes, the instrument includes a programmable delay time of 0 to 1800 seconds, which specifically facilitates the detection of fertilizers.

Q12: What major accessories are included in the standard packing list?

A: The standard kit includes the SKD-500 host, five dedicated buckets (Cleaning, Acid, Alkali, Diluent, and Distilled Water), fuses, plastic pipes, a power cord, and a user manual.