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Design
Bench top module containing cryo-trapping interface and oxidation furnace
on ‘swing out’ plate to enable easy changing of combustion
tube. GC columns housed in isothermal gas chromatograph.
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Analytical
Mode Gas samples are flushed by helium from septum sealed bottles and
purified by a user defined combination of gas chromatography, combustion,
cryo-trapping and cryo-focusing.
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Gas
Chromatography Dual selectable GC columns which include megabore capillary
columns comprising of a Poraplot-Q and Molsieve PLOT columns to cover
many gas analysis methods.
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Cryo-focusing
Stage Cryo-trapping and focus device (3 automated cryo units) which is
capable of trapping and purifying condensable gases such as N2O,
CO2 and NO.
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Sub-sampling
valve Valve to allow samples in the 1 ml range to be analysed as well
as trace gases. Example applications are N2 and O2 analysis or N2/Ar ratio analysis.
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Oxidation
stage Ceramic capillary tube packed with oxidising chemicals for combustion
of CH4 to CO2. Close fitting conversion reactor
with the facility to maintain a temperature of up to 1200°C.
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Isothermal
GC Separate fan assisted oven with digital temperature controller. Temperature
range: ambient to 250°C (0.3°C accuracy, 2°C uniformity).
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Gas
Control High quality stainless steel diaphragm regulators.
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Reference
System Isotope ratios are calibrated by a reference gas injection system
that pulses a relevant bottle gas into the mass spectrometer or against
internal standards of air placed in the autosampler rack.
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Software
The software takes care of system operation (source ionization, IRMS data
collection, peak scanning, flow diversion control) and data processing
& reporting (isotope ratio reduction, peak detection).
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Autosampler
A modified Gilson 222 autosampler has been designed for batch analyses
of air samples. Sample trays to accommodate 12 ml, 30ml, 60ml, 125ml or
250ml bottles are provided.
