Duration
The duration of the AUTOCAL depends on various factors. It is
• Approx. 12 minutes for analyzers with H
2
S sensor
• Approx. 3 minutes for analyzers with O
2
S sensor
• Approx. 2 minutes for analyzers that measure IR and UV components exclusively
It represents the sum of the following durations:
• Twice the set purging time (see Calibration: AUTOCAL/drift values: Purge time (Page 126))
• Duration of the internal electronic damping (corresponds to two and a half times the time
constant T
90
within (see Parameters: Time constants (Page 132))).
Note
An AUTOCAL is carried out twice during the warm-up phase; the rst time approx. 5 min after
switching on, and the second time after approx. 30 min.
Analyzers with UV module
If a UV module is present in the analyzer, a check is carried out after the rst AUTOCAL as to
whether the UV module has reached its setpoint temperature. As soon as this is the case, there
is a waiting period of 55 minutes before the second AUTOCAL is conducted. This means the
warm-up phase is at least 60 minutes; it can increase to more than 120 minutes in case of cold
ambient temperatures.
6.3.3 Initial calibration
Initial calibration with calibration gas
Following installation of the analyzer, we recommend a calibration using calibration gas
(see Calibration (Page 113)). The calibration must be carried out with a gas containing a
sucient concentration of the measured component (between 70% and 100% of the full-scale
value in nitrogen or synthetic air).
Note
The calibration gas is connected via the sample gas path.
After the initial calibration, the analyzer must have been in operation for at least 180 minutes
(for UV components) or 120 minutes (for all other components) before commencing with
measurements since a good stability of the sensors is only guaranteed after this time (99%
value).
Make sure that the gas ow is between 1.2 and 2.0 l/min.
Any noise which may occur can be suppressed by adjusting various time constants (see
Parameters: Time constants (Page 132)).
Commissioning
6.3 Commissioning
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 83
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