Siemens ULTRAMAT 23 Series - Page 35

Climatic conditions (restrictions)
Permissible ambient humidity
• During operation
30% ... 85% RH (relative humidity); in󹪞uence on measurement of SO
2
and
NO exists
In󹪞uencing variables
Note:
After longer periods of storage or transport, the device should be switched
on for 48 hours to meet the drift speci󹪝cation.
Drift
• AUTOCAL cycle activated
• AUTOCAL cycle deactivated
At an ambient temperature of 25 ±2 °C
Drift with 24 h Autocal <3% based on the smallest measuring range ac‐
cording to the nameplate
Drift <3% based on the smallest measuring range according to the name‐
plate per 24 h
Temperature Max. 2% of the smallest measuring range according to rating plate
per 10 K with an AUTOCAL cycle time of 6 h
Air pressure < 1% of the measuring range per 1% pressure change
Auxiliary power supply < 0.1% of the output signal span with a change of ±10%
Line frequency ±2% of full-scale value with a frequency variation
of ±5%
Limitations of the measuring range 0 ... 200 mg/m
3
SO
2
(analyzer versions 7MB2335-xNBxx-xAAx, 7MB2337-xNBxx, 7MB2337-xxxxx-xNBx, 7MB2338-xxxxx-xNBx)
Availability Max. 95%
AUTOCAL cycle time Max. 6 h
Temperature variations Max. 1 °C (1.8 °F)
The device must not be operated in an area subject to drafts. This is espe‐
cially valid for the rear panel with large cooling element.
Other This measuring range has not been suitability-tested.
Note
Device series 7MB235x
• Maintenance intervals: Refer to the current certi󹪝cates in accordance with EN 15267.
• The current certi󹪝cates can always be found on the Internet at: Approvals and certi󹪝cates
(https://support.industry.siemens.com/cs/de/en/ps/17728)
Description
3.4 Technical speci󹪝cations
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 35