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1.1. Explosive, flammable and volatile materials should not be placed in a dry box to avoid explosion.
1.2. The average load of the sample shelf should not exceed 15kg.
1.3. Items cannot be placed on the shelf between the sample chamber and the heating chamber to avoid affecting heat exchange.
1.4. Always check the presence or absence of overlap or short circuit of the nickel wire before use.
1.5. The heating indicator does not light, there are generally three reasons: 1 the bulb is broken; 2 the bulb is in poor contact; 3 the heating system is faulty.
Maintenance and maintenance of electric drying oven:
1.6. Turn on the heating switch without heating. There are four reasons for this:
1 nickel-chromium wire breaking;
2 switch and line desoldering;
3 temperature control knob refers to the zero position (rotate the temperature control knob to the specified temperature scale);
4 The relay is damaged.
1.7. Temperature control failure, there are generally three reasons:
1 The temperature probe is damaged (replace the thermistor);
2 relay damage;
3 Other components of the temperature control system are faulty (use the universal meter to measure the fault, repair according to the situation).
The electric drying oven is used for drying, baking, waxing and sterilization of industrial and mining enterprises, laboratories and scientific research units. The microcomputer intelligent binocular temperature control system has temperature control protection, which is accurate and reliable. The working temperature is arbitrarily set, and has a deviation alarm function, the air inlet switch is free, and the hot air is circulated.
2.1. Before use, you must pay attention to whether the power supply voltage used is consistent. When using, the power outlet ground wire must be grounded as specified.
2.2. When using the power, do not touch the electrical parts of the space on the left side of the box with your hands or use a damp cloth and rinse with water. The power should be cut off during maintenance.
2.3. The power cord should not be wrapped around metal objects. It should not be placed in a place with high temperature or humidity to prevent the rubber from aging and causing leakage.
2.4. Do not over-squeeze the contents of the box, and leave room for natural convection of the air so that the humid air can accelerate and escape on the wind top.
2.5. Regularly check whether the silver contact of the temperature regulator is hairy or uneven. If it is, use the fine gauze to level the contact, then use it, and always wipe it with a cleaning cloth to make it in good contact (be careful to cut off) power supply). Do not hit the metal pipe of the indoor temperature regulator to avoid affecting the sensitivity.
2.6. Do not put flammable materials in the dry box without explosion-proof device.
2.7. After each use, the power supply must be cut off, and the inside and outside of the box should be kept clean. Hang the corresponding logo after cleaning.
On the other hand, if it is exothermic, the solubility decreases as the temperature increases. It should be noted that for heat-labile drugs, the dissolution temperature should not be too high. For soluble drugs, particle size has little effect on solubility, while for poorly soluble drugs, the solubility of the drying oven is related to particle size. When the particle radius is, generally its solubility increases as the particle size decreases, and when the particle radius is greater than 2 x 10e. There is no effect on the solubility. According to Herry's law, under the assumption of the molar volume of the drug, if the solubility is increased by 5%, the pulverization of the drug needs to be pulverized to a particle size of at least less than 0.1 μm.
How to ensure the efficiency of vacuum drying oven
The effect of the temperature of the vacuum oven drying oven on the solubility depends on whether the dissolution process is endothermic or exothermic. When endothermic, the solubility increases with increasing temperature; when the solid drug dissolves, the solubility of most solid drugs in the liquid generally increases with increasing temperature because of the need to dissipate the crystal lattice and must absorb heat. (similar: biochemical vacuum dryer)