Siemens QMX3.P02 - Maintenance and Technical Data; Technical Data: Supply Voltage; Technical Data: Temperature Sensor; Technical Data: Humidity and CO2 Sensors

13 / 16
QMX3... Wall-mounted sensors and room operator units for KNX PL-Link, KNX S-mode and KNX LTE-Mode CM2N1602en_07
Siemens Building Technologies 2017-05-22
• Engineering functions (press keys 1 and 8 simultaneously during 5 s)
– Programming mode (key 2), same function as programming pin
– Connection test (Key 3)
– Reset device to factory settings (key 4)
Note: This operation is irreversible!
• Indicates that the room operator unit is locked by the system.
– Operation is disabled
– The display in line 1 shows the temperature from bus
Maintenance
The device can be cleaned with off-the shelf, solvent-free cleaning agents.
Do not use mechanical aids (rough sponge or similar materials) – only a soft, damp
cloth.
Technical data
Supply voltage
Operating voltage range
KNX / PL-Link DC 21...30 V
The device receives its power from the connected room automation station via the KNX / PL-Link interface
Power consumption
(from room automation station)
QMX3.P02
Max 7.5mA at DC 24 V
QMX3.P30
Max 7.5mA at DC 24 V
QMX3.P34
Max 7.5mA at DC 24 V
QMX3.P40
Max 7.5mA at DC 24 V
QMX3.P37
Max 10mA at DC 24 V
QMX3.P70
Max 15mA at DC 24 V
QMX3.P74
Max 15mA at DC 24 V
Operating data
Temperature sensor (all types)
Measuring element
NTC resistance sensor
Measuring range
0...
50 °C
Measuring accuracy (5…30 °C)
±0.8 K
Measuring accuracy (25 °C)
±
0.5 K
Relative Humidity Sensor (r.h.) (QMX3.P40; QMX3.P74; QMX3.P70)
Measuring range
10%...95% r.h.
Accuracy (20%...80%)
±4% at 25°C
Accuracy (0%...20%, 80%…95%)
±6% at 25°C
CO
2
Sensor (QMX3.P74; QMX3.P70) *)
Measuring range
400..10000 ppm
Measuring accuracy at 23 °C and 1013 hPa
for measured value 400...2000 ppm
for measured value >2000 ppm
±
(30 ppm +4% of measured value)
degraded accuracy.
Temperature dependency
±
2 ppm / °C typical
Pressure dependency
0.14% of measured value / hPa
Long-term drift
±
20 ppm per year
Service life
15 years
*) Notes on CO
2
sensor
• Function: The sensor determines the CO
2
concentration via infrared absorption measurement (NDIR). The sensor is maintenance
free in normal environments, thanks to the built-in self-correcting ABC (Automatic Baseline Correction) algorithm. This algorithm keeps
track of the sensor’s lowest reading within 8 days and corrects for any drift detected. The sensor also contains self-diagnostics to
assure proper operation during lifetime.
• Use: Normal environments, such as offices, class rooms, hotel rooms, or other non-permanently occupied areas, typically reach at
least once a week the CO
2
concentration of fresh air of 400 ppm. However, exposure to a lowest CO
2
concentration other than fresh
air, or incorrect altitude parameter setting, might result in reduced accuracy and incorrect operation.
• Rough handling during transport, storage or mounting might adversely affect accuracy during the first days of operation.
• The specified accuracy is reached after 25 days of continuous operation.
NOTICE