Siemens ULTRAMAT 23, Manual, Page: 83 / 244

Commissioning
6.4 Commissioning
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
83
Note
Analyzers with small CO
2
measuring ranges
In the case of analyzers with small CO
2
measuring ranges, it is necessary to connect the
chopper section purging. This can be carried out with nitrogen or synthetic air with an inlet
pressure of 300 ... 350 kPa (3 ... 3.5 bar). The purging equipment must be connected at least
30 min before switching on in order to guarantee good purging of the analyzer unit.
You can manually trigger an AUTOCAL during operation by pressing the CAL key or also
activate an AUTOCAL via the binary input or the communication interface. The analyzer can
also execute an AUTOCAL cyclically, i.e. at regular intervals.
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 which only measure IR components
This is made up as follows:
● Twice the set purge time (see Calibration: AUTOCAL/drift values: Purge time (Page 123))
● Duration of the internal electronic adjustment (corresponds to two and a half times the
time constant T
90
within (see Parameters: Time constants (Page 129)).
Note
An AUTOCAL is carried out twice during the warm-up phase; the first time approx. 5 min
after switching on, and the second time after approx. 30 min.
6.4.3 Initial calibration
Initial calibration with calibration gas
Following installation of the analyzer, we recommend a calibration using calibration gas (see
Calibration (Page 111)). The calibration should be carried out with a gas containing a
sufficient 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.