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Finnigan GasBench
Figure 2-37.
Hardware Components
II ___________________________________________________________ Open Splits
Principle of Reference Gas Introduction
Principle of Reference Gas introduction
•
left side:
reference gas on
•
right side:
reference gas off
To inject a reference gas, the corresponding reference capillary moves to the
bottom of the open split interface (see Figure 2-37). The reference gas,
e.g. CO2, is then mixed with the 4 ml/min He flow. Now, 0.25 ml/min of this
(He + CO2) mixture is transferred to the IRMS resulting in a rectangular
shaped reference gas pulse. The width of this pulse, e.g. 20 s, is defined by the
time between injecting and removing the reference gas capillary.
Thermo ____________________ Finnigan GasBench II Operating Manual __________________ 2-35
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