AA-7020 atomic absorption spectrophotometer Introduction
Nine new features
1. New furnace body (square): Solve the hidden danger of water leakage, the graphite tube will not be burned due to water leakage, which greatly improves the life of the graphite tube.
2. Replaceable graphite cones: The graphite cones can be replaced in time after they are worn out, ensuring the stability of the electrode's conductivity.
2. Improvement of water seal pipe
The float is associated with the solenoid valve to control ignition, prevent leakage of acetylene caused by lack of water in the water seal, and further improve safety performance.
3. Improvement of combustion head
The combustion head can be automatically raised and lowered to find a suitable flame height, which improves the automation of operation.
4. Laughing device
Laughing gas device can be installed to expand the analysis quantity of high-temperature elements, so that the scope of the instrument can be improved.
5. QC quality control system
The slope of the calibration curve changes with the increase of the number of test samples. It can be set to input the standard solution for the calibration curve calibration at the Nth measurement. The measurement accuracy is improved, and the operability to correct the measurement error is facilitated.
6. Graphite Furnace Autosampler-AA7020 optional parts
Added automatic concentration and dilution functions.
VII. Improvement of internal air circuit, using double air circuit
When the temperature is below 500 ℃, the tested component is ashed to remove water, and 5 ~ 10% oxygen is added under argon atmosphere to change the organic component into CO2, which can effectively reduce interference and improve the analysis accuracy.
When it is above 500 ℃, it is converted into single argon gas to prevent the oxidation of the graphite tube and improve the service life of the graphite tube.
8. Background of Self-Suction Buckle
The background function of self-sucking buckle has been further improved.
9. Light-controlled heating
When the graphite furnace is atomized, a light-controlled temperature increase function is added to increase the temperature increase rate and temperature control accuracy. Features
1. Fast and automatic switching can be achieved within 2 seconds
The two atomizers of the flame / graphite furnace are installed on the same special platform (patent number: ZL 2006 2 0023297.4). The arrangement of the graphite furnace and the element light circuit has been precisely mechanically positioned. All the water, electricity and gas pipelines are installed in place. The automatic conversion analysis of flame / graphite furnace can be completed in 2 seconds, reaching the international level. This greatly facilitates the user to switch from micro analysis to trace analysis. It can also be quickly converted to hydride analysis within 1 minute. This arrangement is very conducive to the use of grassroots operators, avoiding the instrument damage and failures that often occur when the flame / graphite furnace is interchanged and disassembled, and is more conducive to instrument maintenance.
2. Quick peak search
Automatic slit switching, lamp current, automatic gain, energy and negative high voltage automatic balance, automatic wavelength scanning and positioning, all of these tasks can be completed in more than 40 seconds.
3. Integration of flame / graphite furnace atomizer and graphite furnace power supply-reaching international level
The graphite furnace power supply is placed in the main unit. It has a small size and low power consumption (220V, power 4KW). No additional power supply is required. The size of the whole machine is 880mm × 540mm × 450mm. It is one of the compact AAS. This graphite furnace power supply technology has applied for a patent, patent number ZL 2006 2 0023298.9.
4. Optical system suspension design
The entire optical system is suspended on a shock-proof and heat-insulating optical base (patent number: ZL 2006 2 0023296.X). The vibration and temperature changes in the surrounding environment do not affect the stability of the instrument, and it is very practical for places with poor laboratory working conditions.
5. Advanced longitudinal graphite tube heating technology
Mature, advanced longitudinal heating technology, the temperature can reach 3000 ℃, trace analysis of high temperature elements such as Al, Ni, Pd, Sr with atomization temperature above 2600 ℃ can also be easily completed, which can fully meet the needs of disease control and prevention .
6.1800 lines / mm grating score
7. Adopt 1800 strips / mm large area CT monochromator, resolution and sensitivity are higher than 1200 strips / mm monochromator
8. All-titanium combustion head and atomization chamber
It adopts all-titanium combustion head and atomization chamber, which is cast by mold, never deforms, has the characteristics of acid and alkali resistance, non-corrosion, long life, etc., and solves the problems of aging and deformation caused by polypropylene made of atomization chamber .
9. Flame / graphite furnace can perform background correction
The specially designed background deduction device enables high-salinity, high-background samples (such as soy sauce, food) to achieve more accurate analysis results.
10. Safe and reliable automatic protection
Safe automatic protection system of gas circuit: real-time monitoring of pressure, with various protection functions of alarm, power off and gas off for acetylene leakage, air underpressure, abnormal fire extinguishing and other situations.
Safe graphite furnace automatic protection system: it has alarms for insufficient cooling water flow, insufficient protective gas pressure and automatic power-off protection, overheating and overcurrent protection of the furnace body.
11. High degree of automation
Atomizer automatic fast switching
Automatically set the combustion conditions;
Automatic control of graphite furnace heating program;
Automatic control of lamp selection, lamp current, gain, slit, wavelength scanning, etc. is completed;
12. Short optical path design
The whole machine is 880 (length) × 540 (width) × 480 (height) mm, with a shorter optical path. It also has sufficient energy for As, Se and other elements to achieve a low detection limit.
The combustion head of AA-7020 atomic absorption spectrophotometer can be automatically raised and lowered to find a suitable flame height, which improves the automation of operation. The AA-7020 atomic absorption spectrophotometer can be equipped with a nitrous oxide device, which expands the analysis number of high-temperature elements and improves the application range of the instrument.
