Data Sheet for Product

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QMX3... Wall-mounted sensors and room operator units for KNX PL-Link, KNX S-mode and KNX LTE-Mode CM2N1602en_08
Siemens Smart Infrastructure 2020-04-03
· 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.P44 Max 10mA 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.P44, 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