What are the common faults of the four-ring lyophilization experimental lyophilizer

The four-ring lyophilization experimental lyophilizer is a cold-drying equipment
that freezes the aqueous substances into a solid state first, and then sublimates the water in them from the solid state to a gaseous state to remove the moisture and preserve the substance.

Freeze-drying is a technology that uses the principle of sublimation for drying, which can quickly freeze the dried material at low temperature, and then in the appropriate vacuum environment, the frozen water molecules are directly sublimated into a process of
water vapor escape.

The product usually obtained by freeze-drying is called lyophilized, and this process is also called lyophilization
.

In the freeze-drying process, because the material is at a low temperature before drying, and the ice crystals are evenly distributed in the substance, the concentration phenomenon will not occur due to dehydration during the sublimation process, avoiding the foam and oxidation of
water vapor.

Four-ring lyophilization experimental lyophilizer common faults and troubleshooting methods 1, the vacuum level does not reach the index to check whether the outlet valve of the lyophilizer is closed
.

The valve can also be repeatedly opened and closed during the pumping process, so that the outside air can blow the valve hole to blow away the possible impurities in the lyophilizer valve, so as to ensure the sealing
of the valve.

The vacuum pump is connected to the main machine by a vacuum tube, and the clamp at the two connections is checked to see if the clamps at the two connections are tightened
.

The stainless steel joint of the exhaust port on the right side of the lyophilizer main engine can be tightened
clockwise with a large wrench.

Check that the bottom surface of the plexiglass cover is smooth and flat
.

Whether the "O" rubber seal is broken
.

When the lyophilizer starts working, press down hard with the face glass cover for a moment to facilitate the sealing
.

Check the quality of lyophilized oil, observe whether the pump oil becomes turbid or mixed with impurities from the oil mirror, under normal circumstances, continuous work for about 200 hours, it is necessary to replace the lyophilized oil
.

2.
Freeze dryer oil leakage check the oil leakage part of the lyophilizer and replace the corresponding new accessories
.

3, the cold trap temperature is high, generally due to the lyophilizer heat dissipation is poor, or the ambient temperature is high
.

4.
Vacuum display "---" to check the vacuum gauge connection of the lyophilizer