Description: The Finnigan MAT 252 IRMS has a dual micro-volume inlet system, electromagnet, 24X multiport manifold interfaced with a Pentium PC using ISODATTM software. 
Stanford University
Geological and Environmental Sciences, Bldg. 320
Stanford, CA 94305-2115
Finnigan MAT 252 Isotope Ratio Mass Spectrometer (IRMS):
Description: The Finnigan MAT 252 IRMS has a dual micro-volume inlet system, electromagnet, 24X multiport manifold interfaced with a Pentium PC using ISODATTM software.
Power requirements = 230V (-10%, + 6%), 16A three phase, 50/60Hz. Max permissible voltage between ground and neutral lines < 400mV.
Compressed air supply = 50 to 75psig. (350 to 500Kpa).
Reference gases = N2 and CO2.
Environment = Heat output 2.5kW during normal operation; 4.5kW during system bake-out.
Ambient temperature range = 64 to 82°F (18-28°C).
Relative humidity range = 20 to 70%.
Dimensions = 4.3ft H x 5.3ft W x 4.4ft D (130cm H x 160cm W x 134cm D).
Weight = 1,430lbs (650kg).
Finnigan MAT 252 IRMS specs:
Sensitivity = 800 - 1500 molecules CO2/mass 44 ion
Internal precision 2s 13C @ 1 µl CF = 0.03ppt; @ 3 µl CF = 0.005ppt.
Internal precision 2s 18O @ 4 µl CF = 0.02ppt; @ 10 µl CF 0.01ppt.
Internal precision 2s 15N @ 20 µl CF = 0.010ppt.
Internal precision 2s 32S @ 10 µl CF = 0.006ppt.
External precision 1s 13C @ 1 µl CF = 0.1ppt; @ 3 µl CF = 0.01ppt.
External precision 1s 18O @ 4 µl CF = 0.05ppt; @ 10 µl CF 0.03ppt.
External precision 1s 15N @ 20 µl CF = 0.1ppt
External precision 1s 32S @ 10 µl CF = 0.01ppt.
Linearity 0.02 ppt/nA ion current mass 44
A Finnigan Kiel III carbonate device is interfaced with MAT 252 IRMS. For more information refer to the Kiel III specification sheet.