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• Filter — It is a Plexiglas filter. The filling materials used are according to the NC analytical
determination.
To set the temperature
The following procedure is recommended for heating up the furnace of the combustion reactor when
operating with chromium oxide (Cr
1. Increase the temperature from room temperature to 400°C and check the background signals on
the Mass Spectrometer. Check the system for leaks.
2. Increase the temperature from room 400°C to 900°C in steps of 100°C and hold at 900°C for at
least 15 min. This avoids melting the copper within the reactor, which will cause poor
performance.
3. Increase it to the operating temperature of 1020 °C.
WARNING Immediate temperature increase to 1020 °C can cause copper melting. Cooling down
in steps can avoid reactor breaking. Alternatively, you can use the HeatUp and CoolDown script in
Isodat. Right-click on the Flash IRMS visualization window in Isodat and choose the appropriate
context menu item. See
Thermo Scientific
quartz glass reactor of 25 mm OD (Macro Reactor)
Note The EA IsoLink IRMS System for CN/OH comes standardized for a 18 mm OD
quartz glass reactor. For 25 mm reactor tubes the MAS Plus and the top of the EA must be
modified. See the section
page
82.
"Upgrading EA for 25 mm OD Macro Reactor"
O
) at 1020°C:
2
3
EA IsoLink IRMS System for CNSOH Operating Manual
2
Analytical Principles
Preparation of Reactors and Adsorption Filter
on
page
131.
45
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