Siemens 7MB2335, Operating Instructions Manual, Page: 36 / 168

Technical Description
3-14 Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
Technical data, infrared channel
Measuring ranges See Ordering Data
Smallest measuring range See Ordering Data
Largest measuring range See Ordering Data
Chopper section purging
- Input pressure
- Purging gas consumption
approx. 3000 hPa
approx. 100 ml/min
Time response
Warm-up period Approx. 30 min (maximum accu-
racy is achieved after approx. 2
hours)
Response time (T
90
time) Dependent on the length of the
sample gas cell, the sample line
and the programmable damping
Damping (electronic time constant) Selectable from 0 to 99.9 s
Measuring response
Noise of output signal <
±
1 % of the current measuring
range (see rating plate)
Display resolution Max. 4.5 digits, dependent on
selected measuring range; the
number of digits after the decimal
point can be selected
Resolution of output signal < 0.1% of output signal span
Characteristic Linearized
Linearity error In largest measuring range:
<
±
1% of full-scale value;
in smallest measuring range:
< 2% of full-scale value
Reproducibility
≤ ±
1% of current measuring range
Influencing variables
Drift
• With AUTOCAL Negligible
• Without AUTOCAL < 2% of smallest measuring
range/week
Temperature Max. 2% of smallest possible
measuring range according to
rating plate per 10 K with an
AUTOCAL cycle time of 6 h
Atmospheric pressure < 0.2% of measuring range per
1% change in pressure
Power supply < 0.1% of output signal span with
a variation of
±
10%
Power frequency
±
2% of full-scale value with a fre-
quency variation of
±
5%
Technical data, oxygen channel
Measuring ranges 0 ... 5% to 0 ...25% O
2
, parameter
can be set
Auxiliary gas the oxygen sensor must not be
used when the auxiliary gas con-
tains the following components:
H
2
S, chlorine or fluorine com-
pounds, heavy metals, aerosols,
mercaptans, alkaline components
(as e.g. NH
3
in % range)
Typical combustion exhaust gas Influence: < 0.05% O
2
Lifetime Approx. 2 years with 21% O
2
;
continuous operation < 0.5% O
2
will damage the measuring cell
Time response
Response time (T
90
time) Dependent on dead time and
selectable damping
< 30 s with a sample gas flow of
approx. 1.2 l/min
Measuring response
Noise of output signal < 0.5% of full-scale value
Display resolution < 0.2% of full-scale value
Resolution of output signal < 0.2% of output signal span
Reproducibility
≤
0.05% O
2
Influencing variables
Oxygen content operation at times < 0.5 % O
2
dis-
torts the measured value
Humidity H
2
O dew point
≥
2 °C;
the oxygen sensor must not be
used with dry sample gases (no
condensation)
Drift
• with AUTOCAL Negligible
• without AUTOCAL 1 % O
2
/year in air, typical
Temperature < 0.5% O
2
per 20 K, referred to a
measured value at 20 °C
Atmospheric pressure < 0.2% of measured value per 1%
pressure variation