Electrothermal Digester

Abstract

The present invention relates to the field of analytical instruments, in particular to an electrothermal digestion instrument, which includes a heating body, the heating body is connected to an AC power supply through a heating main circuit to form a heating circuit, and the heating main circuit includes an air circuit breaker connected in series, a unit Phase full-bridge rectification and filtering unit and Buck main circuit; also includes a temperature sensor arranged on the heating body, the temperature sensor is respectively connected with the single-chip microcomputer and the PWM control driving unit through the filtering amplification unit, and the single-chip microcomputer is connected with the PWM control driving unit, The PWM control drive unit is connected to the Buck main circuit through an isolation drive unit; the PWM control drive unit samples the current in the heating circuit through a sampling resistor; The set input device. After adopting the above structure, the electrothermal digestion instrument of the present invention adopts a power switch tube to realize precise adjustment of output power, and then can realize precise control of the heating process.

Description

technical field [0001] The invention relates to the field of analytical instruments, in particular to an electrothermal digestion instrument. Background technique [0002] The digestion instrument is a constant temperature device specially used for heating and pretreatment of various analysis samples. It is used together with spectral instruments such as atomic absorption spectrometer, atomic fluorescence spectrometer, IC P atomic emission spectrometer and IC P mass spectrometer. It is very important in sample analysis and testing. Pre-processing equipment. At present, when most laboratories conduct inorganic sample analysis and testing, the sample pretreatment time accounts for about 70% of the entire analysis time. Therefore, the development of a new generation of digestion instrument is the key to improving the efficiency of sample analysis and testing. [0003] In the existing technology, the traditional electric heating mantle and electric furnace can only heat the sam...

AI Technical Summary

Problems solved by technology

At present, the existing electric heating methods, such as transformer voltage regulation direct heating, solid state relay heating, thyristor controlled heating, etc., have disadvantages such as low heating efficiency and poor control accuracy, large temperature control overshoot, and low temperature control accuracy.

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