Working principle The nitrogen blower completes the rapid concentration of samples by blowing nitrogen quickly, controllably, and continuously onto the surface of the heated liquid sample. It is suitable for concentrating a large number of samples. After the nitrogen blower is installed, the chassis is supported in a constant temperature water bath, the water bath power is turned on, the water bath temperature is set, and the water bath begins to heat up. Raise the nitrogen blower, place the samples that need to be evaporated and concentrated on the sample positioning frame, and be supported by the tray. The height of the tray and the positioning frame can be adjusted according to the size of the sample test tube. Open the needle valve of the flowmeter. Nitrogen reaches the gas distribution plate through the flowmeter and the gas pipe. After the gas is distributed, it is sent to the needle valve tube (installed on the gas distribution plate) above each sample position. Then, by adjusting the needle valve needle valve, nitrogen is blown to the liquid sample test tube through the needle valve tube and the needle. The needle valve tube can be slid up and down by adjusting the lock nut to adjust the height of the needle to blow the surface of the sample, and the sample Splashed as well. Finally, place the nitrogen blower in the water bath until the evaporation and concentration is complete.
The nitrogen blower should be used according to the operating instructions in the manual. The following is the general safety knowledge that should be known when using the nitrogen blower. (1) Do not use the nitrogen blower for materials with a flash point below 100 ° C. (2) When using a nitrogen blower, hands and eyes should be protected. (3) The nitrogen blower should be used in a fume hood to ensure good ventilation. (4) Do not move the nitrogen blower during heating to prevent burns. (5) Use three-wire grounded power supply. (6) Do not open the shell of the water bath with power on to prevent electric shock. (7) The maintenance of the nitrogen blower should be carried out by professionals. Improper replacement of components may cause damage to the nitrogen blower or cause safety risks. (8) Do not use nitrogen blower for highly flammable substances like petroleum ether. (9) Do not use acidic or alkaline substances, otherwise the nitrogen blower will be damaged.
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