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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
Read-in tolerance (worst case device accuracy excluding sensor error).
Temperature Range Tolerance Resolution
DHW temperature 1 / 2
Boiler flow / return temperature
25...75 °C
0...100 °C
± 2.3 K
± 3.4 K
0.14 K
0.3 K
Outside temperature
-25...+25 °C
-35...+35 °C
± 1.6 K
± 2.0 K
0.12 K
0.16 K
Flue gas temperature type A and B
50...125 °C
50...150 °C
± 3.2 K
± 4.9 K
0.2 K
0.32 K
The flue gas sensor is used in 2 types of applications:
Type A: Flue gas systems up to 80 °C, sensor can withstand 150 °C
Type B: Flue gas systems up to 120 °C, sensor can withstand 150 °C
Sensors type A and B use the same NTC sensing element as the boiler temperature
sensors, the only difference being the measuring range.
The LMU... measures the ionization current passing through the probe. It can be
displayed directly in µA:
1. Via the QAA73...:
This value can be displayed on the LMU’s parameterization level. It is a data point
that the QAA73... can only read. The time required for updating is about 3 seconds.
2. Via the PC tool.
3. Via the HMI (AGU2.303..., AGU2.310... or AGU2.361...)
Display of ionization
current
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