As a supplier of Dongguan brand nitrogen making machine equipment, the current climate has been no longer high temperature, and the user should know more about the usual maintenance in the equipment work, so that the machine can be used more easily. Today's nitrogen generator gives us a brief introduction.

1, some electrical control is the normal operation of the nitrogen system reuse some, this aspect is the most important;

2, some drainage valves (automatic drainers) of the pre-filter must have drainage function;

3, some frozen dryers plus hot days, must do a good job of heat dissipation of the machine, many are not in operation.

4, the drainage of the gas storage tank, it is necessary to manually discharge, many customers do not know (once to a customer put 80% of the water).

Can not be used under atmospheric pressure (standard atmospheric pressure), there is a serious liquid return (liquid return) appearance, in order to prevent liquid return, the manufacturer describes a variety of equipment to dispose of, but can not dispose of the root question after all, he is to add water, once the equipment fault will constitute the gas path and chromatograph scrap, serious and even lead to the chromatograph scrap. The purity of nitrogen is low, and the thermal element of the TCD chromatograph will constitute oxidation, and the sensitivity of TCD will decrease over time. In summary of the above 3 points exist questions, many chromatograph manufacturers and instrument dealers and other instrument repair personnel do not advocate the use of nitrogen generators as chromatograph carrier gas. If the imported nitrogen generator does not add liquid, the cost is very valuable, if the membrane separation is more difficult, the cost is high, and the maintenance of the film is also very expensive!

But can not just say that chromatography, mass spectrometry with nitrogen generator is not good. Do we know that the domestic now a DF series of nitrogen generator, its function is the same as the imported nitrogen generator, the selection of pure physical chromatography separation method (not membrane separation, no water), no consumables, simple operation. The cost is similar to that of other domestic nitrogen generators. Therefore, I think it is still very good to use this nitrogen generator on chromatography and mass spectrometry.

The role of the cold drying machine is to ensure that the compressed air entering the nitrogen machine is dry, to ensure that the nitrogen machine can work better and extend the life of carbon molecular sieve.

There are three situations in which the dry machine jumps:

First, low voltage jump machine:

1, refrigerant leakage or insufficient refrigerant charge, this situation should be blocked or add refrigerant,

2, is the expansion valve capillary rupture, the treatment method is to replace the top component of the valve body or replace the entire valve,

3, refrigerant pipe throttling, find out the throttling reasons and repair, 4, low pressure disconnect improper setting, reset or replace;

Second, high pressure jump:

1, the high voltage break switch is set improperly, reset or replace,

2, the cooling water is insufficient or the water temperature is too high, to ensure that the sufficient amount of cooling water to improve the water temperature,

3, cold fan burned out, replace the fan,

4. Excessive refrigerant charging, excessive refrigerant discharge,

5, the heat fin is too dirty, the heat exchange effect is not good, need to clean the heat fin;

Three, compressor overload jump:

1, compressor overcurrent (low power supply or lack of phase), check the power supply, contactor and connection and repair,

2, insufficient refrigeration to overheat the compressor, check the refrigerant charging (plugging) if necessary, then add refrigerant,

3, compressor coil short circuit, replace the compressor.