Vilitek AKV-20 automatic Kjeldahl apparatus

The Kjeldahl method as an arbitration method is used to measure protein and nitrogen-containing compounds. VILITEK AKV-20 and AKV-21 Kjeldahl apparatuses are widely used to measure protein weight parts in food, dairy products, animal products, meat products, agricultural products, drinks, beer products, medicines, medical devices and animal feed, as well as in testing of soil fertilizers in agriculture, environmental research.

VILITEK AKV-20 and AKV-21 Kjeldahl apparatuses are used in laboratories of food industry enterprises, dairies, in research institutes, universities and colleges, and are also used to measure nitrogen-containing compounds in the chemical industry and in the study of fertilizers. The main difference between the AKV-20 apparatuses and other Kjeldahl apparatuses (distillators) is a high level of automation and at the same time low cost. There is a multi-user menu and all the most necessary functions and settings for operation, but at the same time there are no unnecessary and rarely used functions. AKV-20 and AKV-21 Kjeldahl apparatuses automatically dispense pre-set volumes of acid, alkali and distilled water during analysis by Kjeldahl method. The distillation may be automatically stopped after expiration of set time. In total, one can pre-configure many different programs, for example, for various products in accordance with specific standards. The menu contains a reference¹ table with a protein ratio of the most common foods and animal feed. The programming of the AKV-20 and AKV-21 apparatuses is very simple and does not require any special skills, it is carried out by means of a touch screen. Programming takes only about two minutes. High accuracy of reagent supply is provided by the integrated pump calibration function. A separate pump is used for each reagent.

Features and advantages:

• High-quality chemically resistant pump made in Germany is used to supply reagents. The built-in pump can significantly simplify the work with the apparatus.
• Kjeldahl flask is made of first-class chemically resistant and heat-resistant borosilicate glass.
• Special chemically resistant tubes and sealed compounds made in the USA.
• Easy-used control system with high fault tolerance is made of Siemens components.

Security systems:

• Current leakage protection system provides personal safety for operators.
• Protection in the absence of a test tube or Kjeldahl flask — the system will not function if the test tube or flask is not installed.
• Security door provides operator safety during distillation.
• Protection against overpressure of the steam system — to avoid danger of too high pressure in the steam system.
• Protection against lack of water in the distillation system — the system will stop working if the water level in the distillator is low or absent.
• Pre-dilution mode — first, a certain amount of water (pre-programmed according to the method used) is added to dilute the concentrated sulfuric acid in the test tube before adding alkali, due to which the reaction of acid and alkali takes place less intensively (without splashing and foam formation).
• Gradual alkalinization — the process of alkali adding is not simultaneous and not instantaneous, but occurs at intervals. It also allows the extinguishing of too sharp reactions of acids or alkalis.

Control system:

• Convenient and easy to use interface.
• User-friendly menu on a large touch-screen display.
• The presence of a multi-user interface with an individual account allows several operators to use the apparatus without changing the list of other user programs.
• Supplied amount of liquid (reagent) and indication mode are in ml. The value which is input on a keyboard is the actual reagent volume to be added by the apparatus, since the analyzer pumps have a calibration function. Accurate, reliable and convenient.

A set of polymer containers for reagents with quick-disconnect chemical fittings and hoses is included in the standard delivery set.

Specifications:

• Measurement range: 0-200 mg nitrogen.
• Distillation rate: ≈15-20 ml/min; ≤5-8 min for each sample.
• Completeness of recovery: 99.5% ±0.5%.
• Distillation time: set randomly between 0-999 s.
• Cooling water consumption: 1.2-2.4 L/min.
• Adding water, alkali or acid: 0-150 ml.
• Operating modes: manual distillation / dual-mode automatic distillation.
• Dual-mode automatic distillation: easy set of distillation programs.
• Kjeldahl flask made of borosilicate glass.
• Display mode: 7-inch LCD touch screen.
• Rated voltage: 220 V / 50 Hz.
• Rated power: 2,000 W.
• Overall dimensions: 500x460x410 mm.
• Overall dimensions of packaging: 630x540x810 mm.
• Net weight AKV-20 / AKV-21: 32.6 kg / 36 kg.

Titration system with an automatic burret and magnetic stirrer

AKV-20 Kjeldahl apparatus is delivered either as a separate apparatus or as a complete unit with PMP digester (furnace for chemical mineralization of a sample), an automatic titration system, and a scrubber for the disposal of acid vapours released during mineralization of samples.

Vilitek AKV-21 Kjeldahl apparatus has the following features in addition to the basic functions available in AKV-20:

• Automatic draining of liquid from a Kjeldahl flask after distillation completion.
• Function of alkali tube flushing.
• Protection against excessively high vapor pressure in the system. In this situation, the device will automatically turn off and alert about a malfunction.
• Distillation temperature control system. To avoid errors in the received data due to insufficient cooling or too high temperature, the system turns off the apparatus and notifies of a malfunction.
• Steam control system by the operator.
• Automatic photometric titrator connection.

Sets of equipment for protein weight parts measuring by Kjeldahl method based on AKV-20 automatic Kjeldahl apparatus at a favorable price

AKV-20 Kjeldahl apparatus. Start package

Complete set:

1. Automatic AKV-20 Kjeldahl apparatus.
2. PMP-8 digester.
3. Water-jet pump.
4. Eight Kjeldahl flasks (c/w digester).
5. Set of polymer containers for reagents.

AKV-20 Kjeldahl apparatus. Optimal package

Complete set:

1. Automatic AKV-20 Kjeldahl apparatus.
2. PMP-8 digester.
3. Gas waste system based at membrane chemically-stable SKB-4 vacuum pump.
4. Water-jet pump.
5. Eight Kjeldahl flasks (c/w digester).
6. Manual titration system based at TUR-1 magnetic stirrer.
7. Set of polymer containers for reagents.

AKV-20 Kjeldahl apparatus. Advanced package

Complete set:

1. Automatic AKV-20 Kjeldahl apparatus.
2. PMP-8 digester.
3. Gas waste system based at membrane chemically-stable SKB-4 vacuum pump.
4. Water-jet pump.
5. Eight Kjeldahl flasks (c/w digester).
6. Manual titration system based at automatic burret and magnetic stirrer.
7. Set of polymer containers for reagents.

AKV-20 Kjeldahl apparatus. Expanded package

Complete set:

1. Automatic AKV-20 Kjeldahl apparatus.
2. Exhaust hood.
3. PMP-8 digester.
4. Gas waste system based at membrane chemically-stable SKB-4 vacuum pump.
5. Water-jet pump.
6. Eight Kjeldahl flasks (c/w digester).
7. Manual titration system based at automatic burret and magnetic stirrer.
8. Set of polymer containers for reagents.

Vilitek AKV-20 Kjeldahl apparatus screen samples:

To perform a Kjeldahl protein analysis in accordance with current standards, you may need the following additional equipment:

• Laboratory balance with permissible absolute error of a single weighing ±0.0001 g. We recommend using the Ohaus PA114C analytical balance.
• Laboratory balance with a permissible absolute error of a single weighing of ±0.01 g. We recommend using the Ohaus STX222 laboratory balance.
• Rotary homogenizer with a four-blade knife, knives’ rotation speed is 1,000-10,000 rpm, including a container with a capacity of 1.0 dm. We recommend using the laboratory homogenizer HT Machinery HM-302.
• Thermostatically controlled water bath allows maintaining the temperature from 0 °C to +100 °C with a permissible error of ±2 °C. We recommend using the Digisystem WB-500D laboratory unstirred water bath.
• Laboratory hot air oven providing temperature maintenance from +50 °C to +150 °C with a permissible error of ± 2 °C, we recommend using the Digisystem DSO laboratory hot air ovens.