Siemens 7MB2335, Operating Instructions Manual, Page: 46 / 168

Start-up
4-4
Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
4.3 Start-up
Once you have established that the analyzer is set to the required
voltage and that all connections have been made, connect it to the
power supply. Switch the analyzer on and permit it to warm up (see
Section 5.3).
4.3.1 AUTOCAL
The analyzer carries a calibration with the connected medium when
switched on. This AUTOCAL calibrates the zero and sensitivity of the
IR channels. If an O
2
sensor is present, its sensitivity is calibrated in
addition.
Notice
In analyzers without an O
2
sensor, the AUTOCAL can be executed
with nitrogen, in the case of analyzers with an O
2
sensor, it must be
executed with air. The supplied medium is selected depending on the
analyzer configuration (gas connections) and cannot be parameterized
using the software.
The chopper section purging must be connected in analyzers with
certain CO
2
ranges. This can be achieved using nitrogen or synthetic
air with an input pressure of 300 to 350 kPa (3 to 3.5 bar), and should
be connected at least 30 minutes prior to switching on in order to
guarantee good purging of the analyzer section
.
You can manually trigger an AUTOCAL during operation by pressing
the
CAL key. The ULTRAMAT 23 can also execute an AUTOCAL
cyclically, i.e. at adjustable, regular intervals (see below).
The duration of the AUTOCAL depends on various factors. It takes
approx. 3 min and is comprised as follows:
S
Twice the set purge time (see Section 5.8.4)
S
Duration of internal electronic adjustment (corresponds to
two-and-a-half times the time constant ”T90 within”; see Section
5.9.3); if an O
2
sensor is used, the electronic adjustment is at least
60 s.
Switching on the
power supply
General
Duration