Melting Point Apparatus
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Melting Point Apparatus
Melting point determination apparatus is important in the study of chemical industry, medicine, is a necessary instrument to produce drugs, spices, dyes and other organic crystal material. In the field of organic chemistry, melting point measurement is the basic means to identify the physical nature, is also one of the important methods to determine the purity of.
Working principle:
Melting point apparatus is designed in accordance with the melting point detection method of Chinese Pharmacopoeia, the instrument uses the electronic technology to realize the temperature control, initial melting and final melting digital display. Application of the platinum resistance linear correction for detecting element, linear and electronic circuit used to achieve fast "temperature" setting and four alternative heating rate. The instrument adopts capillary Pharmacopoeia as the sample tube, the high rate of amplification melting process, samples were observed in the capillary is clear and intuitive, instrumentation, chemical, dyestuff, melting pharmaceutical spices, rubber ideal.
Melting point determination:
Starting temperature of 1 by the starting temperature dial input needed, the initial temperature setting should be lower than the melting point of the substance to be measured (not more than 280 ℃), according to the linear heating rate, choosing the recommended as the following table for the reference of the users.
Rate selection start temperature below the melting point
0.5 C 3 C /min
1 ℃, /min 3 ～ 5 ℃
1.5 ℃, /min 6 ～ 10 ℃
3 ℃, /min 9 ～ 15 ℃
2 turn on the power to shape, through the observation window can see the lights, silicone oil was motor agitation, the instrument has been switched on, the screen will display the current oil bath temperature, then the instrument automatically reach the preset temperature and automatic balance, if you want to modify the preset temperature, the re enter the preset temperature, click "placement" button.
3 instruments to warm up for 20 minutes, the capillary with the substances to be measured from the small holes into the mouth in into the oil bath tube (insert and remove the capillary inlet must be circumspect, do not bend).
4 according to the needs of heating rate, press the corresponding button, the upper left is a light indicator, the instrument has entered the linear temperature working condition, four speed linear heating rate key can change at any time, for unknown melting point values of samples can be used to get the initial rapid heating melting range and precision measurement.
5 through the observation window view inside the capillary sample melting process, melting at first appear, press the "by melting" key, initial melting storage indicating lamp is bright, the initial melting has been stored. The final fusion appears, press the final melting bond, the digital display is hold, this value is the value of the final weld.
Note: if the malfunction, you cannot modify initial, final melting readings, but re measurement.
6 if you want to read the initial melting, click on the initial melting reading key, the display of digital is the initial melting value, but after a few seconds, the digital display and conversion to the final melting value. This has been repeated reading.
7 carefully remove capillary measurement.
8 if you want to repeat the same sample, then click on "into the" key, the instrument automatically enter the starting temperature setting, balance after 3-7 steps can be repeated.
9 If you want to test other substances through the melting point, the initial temperature dial to enter the starting temperature of the new, and then click the "placement" key repeat 3 - 7 steps can be.
10 generally recommend users to measure material of low melting point, high melting point substances after.
11 if you have what problem instrument in use process, can contact and Chengdu Science and Technology Department elegant source Engineer in time, so as not to affect the operation of your experiment.
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