Cryoconcentration unit CCU-6 (hereinafter referred to as CCU-6) is an integral part of an automated chromatographic complex based on a Crystallux -4000M gas chromatograph and is intended for quality control of helium 99,9999 and hydrogen 99,9999 for trace amounts of Ne, CH4, O2+Ar, N2, CO, CO2 и H2.CCU-6 concentrates gaseous impurities (Ne, H2, O2+Ar, CH4, CO и СО2) in helium and hydrogen in sorption columns at the temperature of liquid nitrogen, which are afterwards focused and desorbed and introduced into GC (equipped with FID-TCD and TCD- CCD detectors) to determine their qualitative and quantitative composition.
|Test gas||helium, hydrogen|
|The temperature of the sorption columns during adsorption,0С||-196|
|Maximum thermal desorption temperature,0С||400|
|Pressure of the analyzed gas, no more than MPa||0,4|
|Inlet gas pressure, not more than MPa||1,0|
|Total analysis time, no more than minutes||17|
|The volume of the vessel with liquid nitrogen, l||6|
|Automatic refill of liquid nitrogen before each concentration cycle||-|
|Power supply||230-240В, 50-60Hz|
|Input power no more than, kW0С||2000|
|Overall dimensions, mm||510х600х1550|
|Weight, no more than kg||30|
This installation is an improved typ, it is made for the determination of trace elements not only in helium, but also in hydrogen.
In UKK-6, liquid nitrogen is added automatically, which minimizes the dangers of contact with such a dangerous substance.
The detection limits of the installation are shown in tables 1 and 2.
Table 1 Detection limits for helium analysis.
|% vol. He , %, no less||99,9999|
|% vol. O2+Ar, %, no less0С||0,000015|
|% vol Ne, %, no less||0,000015|
|% vol N, %, no less||0,000045|
|% vol CO2, %, no less||0,00001|
|% vol CH4, %, no less||0,000005|
|% vol CO, %, no less||0,000005|
|% vol H2, %, no less||0,000005|
Table 2 Detection limits for hydrogen analysis
|% vol H2, %, no less||99,9999|
|% vol O2+Ar, %, no less||0,000015|
|% vol N, %, no less||0,00006|
|% vol CH4, %, no less||0,00001|
|% vol CO + CO2, %, no less||0,000015|
The technical characteristics of the purchased units used are given in the technical documentation for these units supplied with the unit.