Functional description
5
gas-lab
Q1
Page 39
By confirming the selection the
gas-lab
Q1 terminates the calibration process.
The process will be aborted automatically if an alarm occurs during calibration.
Afterwards, the
gas-lab
Q1 uses the same calibration data as before, provided
such data exists.
The basic calibration consists of the following steps:
1. Preparation
2. Zero point adjustment with nitrogen
via path 3
3. Calibration with methane (1. calibration gas)
via path 2
4. Calibration with H2-11K (2. calibration gas)
via path 3
5. Calibration with L1-8K (3. calibration gas),
via path 3
optional with a binary gas mixture (5% CO2 in methane)
1. Preparation
For successful completion of a 3-point calibration, the methane cylinder, also
used for the automatic calibration, has to be connected correctly to the second
gas path (see 5.1.4). The cylinder regulator must be set to approximately 2 bars
and the precision pressure regulator (M2R) of the second gas path to about
80 mbars.
If the methane cylinder has not been opened yet, open it and perform a purge
first (see 5.1.5).
Furthermore nitrogen and two other calibration gases (H2-11K, L1-8K or binary
mixture) will be connected one after another to the third gas path during the
calibration process. Since they are not needed for normal operation, they have
to be connected first.
The nitrogen is needed first, so his connection to the third gas path is described
next and stands also for the other two gases.