Siemens ULTRAMAT 23, Руководство пользователя, Страница: 39 / 244

Description
3.4 Technical specifications
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
39
Influencing variables
Oxygen content
In the case of occasional operation < 1% O
2
, the measuring accuracy
below 1% O
2
is limited.
An improvement in the measuring accuracy at concentrations <1% O
2
is
possible under the following conditions:
• Permanent measurement of concentrations <1%
•
No mixed operation with occasionally high concentrations and occa-
sionally low concentrations (brief high concentrations e.g. by means
of an AUTOCAL with air at intervals of at least 3 hours are permissi-
ble)
Typical combustion exhaust gases Influence: < 0.05% O
2
Humidity H
2
O dew point ≥ 2 °C (36 °F); the oxygen sensor must not be used with
dry sample gases (no condensation)
Drift
•
With AUTOCAL
•
Without AUTOCAL
Negligible
1% O
2
/year in air, typical
Temperature <0.5% O
2
per 20 K, relating to a measured value at 20 °C (68 °F)
Air pressure < 0.2% of measured value per 1% pressure change
3.4.5 Paramagnetic oxygen sensor
General information
Measuring ranges
2 per component
Min. 0 ... 2 vol % O
2
(limited accuracy)
0 ... 100 vol % O
2
Permissible ambient pressure 700 ... 1 200 hPa absolute
Permissible operating temperature 5 ... 45 °C (41 ... 113 °F)
Measuring response
Response time (T
90
time) <60 s
Output signal noise < 1% of smallest measuring range
Reproducibility ≤ 1% of smallest measuring range