Mass-spectrometer MTI-350GS
The mass-spectrometer MTI-350GS is intended for automatic control of the blend composition at sublimate production of the uranium hexafluoride and operative control of the technological process. Fluorination of the uranium protoxide-oxide in the flame reactor is performed during the sublimate production. In order to check the process it is necessary to analyze the contents of the following substances: hydrogen fluoride (HF), nitrogen (N2), oxygen (O2), fluorine (F2), argon (Ar) and uranium hexafluoride (UF6). By comparing the results of composition measurement of the substances with the predetermined set-points the selection of the control and emergency signals is carried out. The mass-spectrometer MTI - 350GS provides for measurement of the gas blend composition and control over the reactor operation round-the-clock and continuously in fully automatic mode.
Features:
original ion-optical diagram of the mass-analyzer;
constant magnet with highly uniform magnetic field;
common boundary for entering of ions of compositions, separate outlet boundaries for ions of heavy and light components;
registration of uranium hexafluoride UF6 simultaneously by the maximum number of components of its mass-spectrum;
five-chamber collector of light masses with the adjustable position of collecting chambers;
two reserve ion sources stored in the special vacuum volumes make a part of the device;
electronic part executed with application of the modern hardware components;
controller computer on the basis of the advanced reliability industrial computer;
specialized software ensuring the device control.
Characteristics of mass-spectrometer:
| Simultaneously registered components of the blend under test (registered mass numbers) |
HF, (20) N2, (28) O2, (32) F2, (38) Ar, (40) UF6, (234 – 352) |
| Resolving capacity, |
not less than 100 |
| Rundown time to the level of 0,1% |
not more than 20 sec |
| Instability of accelerating voltage |
not more than 2•10-5 |
| Upper boundary of mass range |
not less than 350 amu |
| Relative standard deviation of the unit composition of component part of the gas blend under test |
not more than 10 % |
| Full average service life of the mass-spectrometer |
not less than 10 years |
The instrument is equipped with a protection system against voltage fluctuation and blackout in the supply mains.
The instrument of equipped with the vacuum system state signalization and means for emergency shut-down of assemblies at loss of vacuum.
Power is supplied from three-phase AC network, voltage 380/220 V, frequency 50±0,5Hz.
Area occupied by the mass-spectrometer does not exceed 10 m2
Mode of operation – continuous, round-the-clock
In order to provide commutation of gas flows to the ion source, calibration of the mass-spectrometer, control over the mode of the analyzed samples puffing, preparation and storage of calibration mixtures in the mass-spectrometer use is made of the stand for preparation of the calibration mixtures (CPCM). In order to keep samples containing uranium hexafluoride in gaseous state and to prevent condensation of uranium hexafluoride on the walls of the gas communications a part of the CPCM vacuum circuit is isolated from the environment by means of the active thermostat, and a temperature of 70°С to 90°С is maintained in the elements and assemblies located inside the thermostat. The CPCM is equipped with valves providing commutation of gas flows in the process of measurements and at preparation of the calibration mixtures, sensors and controllers of pressure in different parts of the vacuum circuit, as well as heaters, temperature sensors and controllers regulating the heating of separate assemblies of the temperature-controlled part.
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