Laboratory common heating instruments and methods
Hebi Tianhua Instrument Co., Ltd. 2014.7.28
(1) Tianhua electric heating constant temperature water bath The electric constant temperature water bath has two holes, four holes and six holes. Its structure is divided into two layers inside and outside. The inner layer is made of aluminum plate, the outer shell is made of thin plate, and the surface is covered with paint: copper tube is installed at the bottom of the groove . The electric wire is connected with the porcelain terminal to connect the double-strand wire to the controller; the surface of the controller has a power switch, a temperature adjustment knob and an indication. Lamp: There is a drain valve on the lower left side of the water bath, and a thermometer can be inserted on the upper side. The shape is shown in Figure 2-5 . Water bath a temperature in the range of 37 l00 ℃, the supply voltage is 220 volts. Thermostat heating and as an evaporator. When using, remember that the water level must not be lower than the electric heating tube, otherwise the electric heating tube will be burned immediately. Pay attention to moisture . Check the water bath for leaks at any time. See the instructions for each instrument for the method of use.
(2) Tianhua Electric Furnace Electric furnace is a device that converts electrical energy into heat energy by using electric heating wire. The temperature can be controlled by adjusting the resistance. When in use, the asbestos net is separated between the container and the electric furnace to make the heat uniform. Tianhua Instruments provides a variety of experimental instruments
(3) Alcohol lamps Alcohol lamps are generally made of glass. It consists of three parts: lamp cap, wick and lamp pot. The lamp flame temperature is usually up to 400-500 °C, the outer flame is the highest, the inner flame is second, and the flame heart is the lowest. Alcohol lamps are used for experiments where the temperature is not too high. When igniting, do not use a ignited alcohol lamp to ignite directly. When adding alcohol, the flame must be extinguished and the amount added must not exceed two-thirds of the lamp capacity; extinguish the alcohol. The lamp must be extinguished with a lamp cover. Do not blow with your mouth.
Analysis of several heating methods
( 1 ) Direct heating A solution or pure liquid that does not decompose at a higher temperature can be placed in a beaker or a flask and heated directly on an asbestos web. Laboratory heating equipment, laboratory testing equipment
(2) water bath was required when heated uniformly heated. With a temperature not exceed 100 "C. Water bath heating. The heating temperature in the following 90 ℃, may be partially filled container in a water bath was granted.
(3) Oil bath, sand bath heating If heating is required at 100"C : above to 250" ( : The following temperature, oil bath can be used: If you need to heat to a higher temperature, use a sand bath
This article comes from : Hebi Tianhua Instrument
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