SIEMENS QFA2020 Room Indoor Temperature and Humidity Transmitter

IndoorHumidity and Temperature Sensor QFA20
Measure relative humidity and temperature
• Operating Voltage AC 24V or DC 13.5...35V
• Relative Humidity Output Signal: DC 0...10 V
• Temperature output signal DC 0...10 V or LG-Ni 1000 or T1
• Accuracy within the comfortable humidity range is ± 3%
• Application Range: -15…+50 °C / 0…95% Relative Humidity (Non-Condensing)
Applicable
For measuring room air in ventilation and air conditioning applications:
Relative humidity, and
• Temperature
QFA20... for use as.
Sensors and actuators for control and regulation applications
Building Automation System or Measurement Sensors in Display Units
Construction Caution
Power consumption of active indoor sensors can affect temperature measurement. The Symaro™ indoor temperature sensor features a compensation function, which eliminates the impact of heat dissipation from operating voltage (AC24V) on temperature measurement.
Additionally, the following situations will also affect the measurement accuracy:
Indoor Wind Speed
Wall Smoothness (Rough, Smooth)
Wall Materials (Wood, Plastic, Cement, Brick and Concrete)
Wall Type (Interior, Exterior)
A stable measurement accuracy requires stable indoor air convection and the sensor should be continuously powered for a period of time after (greater than 10 minutes).
A safety low-voltage transformer with a separate coil is required to power the sensor. When selecting and protecting the transformer, adhere to local safety regulations.
Select the transformer size, considering the power consumption of the indoor sensors.
Please refer to the sensor technology documentation for proper sensor wiring.
The cable length must be within the permissible range.
Cable laying and cable selection
When laying cables, it must be noted that the longer the parallel laying length and the smaller the spacing, the greater the electromagnetic interference.
In environments with EMC interference, shielded protective cables are required.