Following successful checking, connect the analyzer to the power supply and switch it on. Wait
for the warm-up phase to elapse (see Warm-up phase (Page 93)).
6.3.2 AUTOCAL
After switching on and after a short warm-up phase (5 minutes), the analyzer performs an initial
automatic calibration with the connected medium. This AUTOCAL adjusts the zero point of all IR
and UV measured gas components. If an O
2
sensor is present, its sensitivity is additionally
calibrated using the connected ambient air (20.95% O
2
).
At the end of the complete warm-up phase (minimum 30 minutes), a second automatic
calibration is performed. Zero gas should be connected during the entire warm-up phase.
Note
Analyzers with H
2
S sensor
The hydrogen sulde sensor is not calibrated during the course of this rst AUTOCAL. The zero
point of the H
2
S sensor is only calibrated starting from the second AUTOCAL of the analyzer.
Note
Analyzers without electrochemical O
2
sensor
In the case of analyzers without an electrochemical O
2
sensor, the AUTOCAL can be carried out
with nitrogen, but in the case of analyzers with an electrochemical O
2
sensor, it is essential to use
air. The correct medium is selected depending on the used conguration (gas connections) and
cannot be parameterized using the software.
Note
Analyzers with paramagnetic O
2
sensor
In the case of analyzers with a paramagnetic O
2
sensor, the input menu can be used to select
whether the AUTOCAL is to be carried out with air or N
2
, and thus whether the sensitivity
(20.95% O
2
) or the zero point of the sensor is calibrated.
Note
Analyzers with small CO
2
measuring ranges
In the case of analyzers with small CO
2
measuring ranges (useful below 1000 vpm), the chopper
compartment purging must be connected. 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.
The device performs an AUTOCAL at regular intervals. You can manually trigger an AUTOCAL
during operation by pressing the CAL key, or activate an AUTOCAL via the binary input or the
communication interface, for example via Siprom GA. The analyzer can also execute an
AUTOCAL cyclically, i.e. at regular intervals.
Commissioning
6.3 Commissioning
ULTRAMAT 23
82 Equipment Manual, 04/2022, A5E37100388-012
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