First, the precautions for choosing a well-type digestion furnace:
Pit digesters play a very important role in protein detection. Choosing a suitable pit digester is the prerequisite for accurate testing. How to choose a well-type digestion furnace? The matters needing attention in choosing a well-type digestion furnace will cause you to pay enough attention.
Second, the indicators of well digestion furnace should pay attention to several points:
1. The temperature should be constant, the fluctuation should be small, each sample can have a consistent digestion time,
2. The temperature of each sample hole should be the same to prevent the sample digestion time from being too different.
3. It can effectively control the process of temperature change, so as to avoid the sample hanging on the wall during digestion.
4. Effective thermal insulation measures to improve the stability of the temperature in the furnace cavity
3. The investigation of well digestion furnace needs attention:
1. Effective temperature control, so that the digestion can control the temperature as needed. If there is a programmed temperature control, it can effectively achieve the desired.
2. Well-type digestion furnace has good insulation measures. If the insulation material is thin, it will cause temperature instability. The thicker insulation layer of the instrument is required for temperature stability. Therefore, the thickness and material of the insulation material are an important indicator,
3. For the selection of heating body and heat carrier, different heat carriers can be selected according to the needs of users. Let's discuss the choice of heating body and heat carrier.
Fourth, there are two main ways of heating:
The far-infrared quartz heating element adopts pearlescent opalescent quartz tube with electric heating material, so that the original has excellent and reliable far-infrared radiation characteristics. After energization, 97% of the infrared light and visible light emitted by the thermal material are blocked and absorbed by the opalescent tube so that the wall temperature Elevated to produce silicon-oxygen bond molecule vibration radiation far infrared, so that 97% of visible light and near infrared light can be converted into far infrared radiation. It overcomes the shortcomings of using transparent quartz glass to transmit visible and near infrared rays, thereby effectively converting electrical energy into far infrared rays. The sample is heated by thermal radiation, which is characterized by fast temperature rise, small thermal inertia, and accurate temperature control. Generally used in the digestion of samples with high requirements. For example: there is a faster heating and cooling rate. Programmable temperature increase can enable users to choose the temperature increase curve according to the characteristics of their own samples, or choose a segmented temperature increase, which is more beneficial to sample digestion, thereby eliminating the phenomenon of sample hanging on the wall, and thereby greatly improving the efficiency of sample digestion
The aluminum ingot is heated and the heat is transferred to the sample by the aluminum ingot. Features: slower temperature rise, greater thermal inertia, and stable temperature. Due to the good thermal conductivity of the aluminum ingot, the temperature consistency between each sample hole is good. It is widely used in the heat carrier of pit digestion furnace, but it should also be noted that a thin aluminum ingot can not keep the temperature constant, so the aluminum ingot pit digestion furnace is selected, and the thickness of the aluminum ingot is also an index for investigation.
Graphite is heated, and the heat is transferred to the sample by graphite. Features: The thermal inertia is large and the temperature rises slowly. Due to the poor thermal conductivity of graphite (compared to aluminum ingots), the temperature between the sample pores is not uniform, which tends to cause the digestion time between samples to increase. However, due to the low cost of graphite, the cost of graphite well digestion furnace is cheap, which has certain appeal to some low-end users.
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