Sercon HS2022稳定同位素质谱仪

分辨率：m/∆m ≥ 110

质量范围：1-96 amu

测量范围：HD、¹³C、¹⁵N、¹⁸O、³⁴S

测试精度：¹³C<0.1

Sercon Ltd., U.K  is the only dedicated manufacturer of Stable Isotope Mass Spectrometers and their associated sample preparation systems for Isotope Ratio Mass Spectrometry (IRMS Instrumentation). Sercon also provides Stable Isotope labelled compounds.

Backed by a wealth of experience in Isotope Ratio Instrumentation, Sercon provides a full range of services specific to isotope ratio scientists and their applications.

Sercon manufactures a family of Stable Isotope Mass Spectrometers; Continuous Flow and Dual Inlet IRMS.

Other modules available are:

• ¹³C and ¹⁵N Analysers,

• Automated Breath Carbon Analysers,

• Elemental analysers,

• Sample Preparation systems for gaseous, solids and Liquids,

• Gas Chromatographic interface - GC Combustion/ Pyrolysis systems,

• Cryogenic Gas purification and concentration systems,

• TOC- Cryo-prep device for high precision 13C analysis from dissolved carbon,

• High temperature elemental analyser system,

• Carbonate Acid preparation system,

• Water Equilibration system  and

• Customised Sample Preparation devices.

指标参数： 

1、Geometry 

120° extended geometry with an 11 cm radius magnetic sector giving an effective 21 cm radius dispersion and double direction focusing. Truly universal Faraday triple collectors for simultaneous collection of adjacent masses in range 28, 29, 30 - 64, 65, 66 with no adjustment of collectors or amplifiers. Additional long spur with 98.8° sector which creates a distance of 24 cm between the focal points for m/z 2 and 3. Additional single Faraday collector for m/z 3. 

2、Materials 

All stainless steel construction with metal gasket seals to ensure ultra clean internal environment. The use of all metal permits bake out of the analyser and negligible water background. Industrial sealing technology (conflat flanges) means no dead volumes within ion optics so eliminating contamination and memory effects. 

3、Ion source 

High sensitivity, electron impact, plug-in design. 

4、Magnet 

Programmable electromagnet. 

5、Resolution

 m m= 90 (N₂ ) 10% valley definition. m m= 40 (H₂ ) 10% valley definition.

6、 Sensitivity

 < 1000 molecules per m/z 44 ion. < 10000 molecules per m/z 2 ion. 

7、Abundance Sensitivity 

< 5 ppm for N₂ , < 30 ppm for CO₂ < 1 ppm for H₂ at 4 x10^-6 mbar He in continuous-flow mode. < 10 ppm for CO₂ - dual-inlet mode. 

8、Linearity < 0.03‰ / nA at beam intensity of 2 x10^-8 A for CO₂ 

9、H³⁺ 

<5 ppm / nA. Stability < 0.03 ppm/nA/hour.

10、 Sample Decay 

Time for a signal of 2E^-8 Amps for m/z 44 to decay below 2E^-10 Amps when inlet is isolated. Continuous flow mode = 30 seconds 

11、Vacuum 

Mass analyser - truly differentially pumped by 2 x drag stage turbomolecular pumps (70 L/s) backed by two-stage rotary pumps. Ultimate vacuum of 1 x 10^-9 mbar. Source pressure monitored by inverted magnetron gauge. (Nb. this configuration is essential for GC-C-IRMS applications). 

12、Inlet 

Zero dead volume capillary interface to allow the use of continuous flow methods e.g. ANCA-MS and GC-C-IRMS. 

13、Data acquisition system 

Data acquisition system uses state of the art highly stable and linear high frequency converters which produce integral slices with zero dead time and quantisation below the beam statistical noise floor at all signal levels. 

14、Software 

Sercon Callisto software. Proprietary operational software for system control and data handling. Fully compatible with all versions of Windows, currently systems are installed with Windows 7. 

15、Electronics 

Sercon System Controller. Flashover-resistant electronics with semiconductors close to ground and isolated from high voltages. Full control of ion source parameters through software and on-board microprocessors. Communication is via USB with PC system. Valve control outputs for 32 valves as standard, can be extended to 64. Four VFC channels for ion beam and other detector readbacks are installed, extendable to eight or twelve depending on system configuration. 

16、Refgas 

Triple-port reference gas injection system to calibrate sample peaks produced by attached continuous flow modules. Fitted with dedicated pneumatic valves and inlet manifold for 3 reference gas bottles. Reference valve array can be expanded to six or more reference gases if required. 

17、Basic unit comprises 

20-22 mass spectrometer. Fitted with a triple and single collector for ¹³C, ¹⁵N, ¹⁸O and ²H, and electromagnet.

18、Precision 

Precision analysis will always yield an SD better than presented below for 5 injections of gases at natural abundance. Major beam of 10 nano amps.

参考0730-1561GDBJ0501：

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气相色谱-稳定同位素质谱联用仪（河北局）