Thermo Scientific EA IsoLink IRMS System, Operating Manual

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6
Using EA IsoLink IRMS System for CNSOH
Setting Up a HO Method
Thermo Scientific EA IsoLink IRMS System for CNSOH Operating Manual 97
If no hydrogen peak can be found, Isodat Software Suite waits, for example, 25s. Data acquisition
follows immediately after injection. See
Figure 104 .
Dual Measurement
Thermo Fisher Scientific assumes that the user already has working experience with the ConFlo IV
interface and the IRMS. Thermo Fisher Scientific recommends to perform a simple check in order to
test the analytical condition of the complete system before measuring any samples. Before the dual
measurement can be started, some preparation are necessary.
Before running a dual measurement, the Peak Jump from H
2
to CO must be created. See “Performing
a Jump Calibration” on page 85 . If a jump is already defined, make sure the jump is re-calibrated
regularly. It is recommended to perform a re-calibration on a daily basis.
Preparing the Hardware
 To prepare the hardware components
1. Set the reactor temperature to 1450 °C.
2. Set the GC column temperature to 90 °C. Set it to 70 °C if you are running N-containing samples.
3. Set the helium flow to >100mL/min.
4. Set the reference flow to 100 mL/min.
5. Make sure that the standard gas (H
2
and CO) on ConFloIV are available.
Determining the H3-Factor
The H3-factor is determined as described in the section “H3-Factor Determination” on page 107 .
Creating a New Method for Dual Measurement
As a guideline for creating a new dual measurement method, the method HD_CO.met should be
used.
 To create a new method for an dual measurement
1. Open Acquisition .
2. Click New to create a new method.
3. In the File New dialog box, double-click Method .
4. Click the tab Instrument of the new dual measurement method, see Figure 105 .