Siemens Building Technologies QFA Series Data Sheet
Room/Outdoor Relative Humidity and
Relative Humidity/Temperature Sensors
QFA Series
AQY2010
Remote Sensing Cable
Shown with QFA3100.
Description
The QFA Series Outdoor Air Relative Humidity and
Relative Humidity/Temperature Sensors monitor and
transmit changes in humidity and temperature to the
building control systems. Standard models available
are 2% and 2% certied, for both humidity only and
combination humidity with temperature sensing.
Sensors are offered with either 4 to 20 mA or
0 to 10 Volt output signals.
Features
• 4 to 20 mA or 0 to 10 Vdc output signals
• High degree of accuracy
• Removable, replaceable sensing tip sold seperately
on B-39
• "D" sufx models include LCD Display*
* Units with display are not intended for outdoor use.
QFA3100 Series
Outdoor Air Relative Humidity and
Relative Humidity/Temperature Sensor.
AQF3100
Sunshield for Sensor.
Sold Separately.
Applications
The QFA Series Relative Humidity and Relative Humidity/
Temperature Sensors are especially suited for applications
where precise, stable humidity sensing is required.
For outdoor applications, an AQF 3100 sunshield is
required (sold seperately).
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Sensors
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QFAx1 Specifications
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General
Installation ................................................ 18 AWG cable length shared in
conduit with other sensor wiring 750 ft. (229 m) max
Connections ................................................................... Screw Terminals
Dimensions
Outdoor Air Probe................. 6" O.D. x 3.3" L (15 mm O.D. x 84 mm L)
Outdoor Air Housing .......................................... 3.1" L x 2.3" W x 1.5" D
(80 mm L x 60 mm W x 40 mm D)
Shield (mounted) ............................................ 3.43" H x 3.5" W x 4.1" D
(87 mm L x 89 mm W x 104 mm D)
Voltage Requirement .................................................. 13.5 to 35 Vdc and
24 Vac ( for sensors with 0-10 Vdc outputs)
Material Type ........................................................... Polycarbonate plastic
CE and UL listed ...................................UL 873 standard for Temperature
Indicating and Regulating Equipment
Humidity Element
Operating Range ................................................................. 0 to 100% RH
Measurement Range ............................................................ 0 to 95% RH
Accuracy at Room Temperature (73°F, 20°C) ..........±2% RH, 0-95% RH
Operating Temperature ...............................-31 to +140°F (-35 to +60°C)
Temperature Effect .....................................Less than 0.1% per degree C
Sensing Element............................. Capacitive humidity sensing element
Output Signal
RH only units .. 4 to 20 mA or 0 to 10 Vdc, 0 -100% Linear, Proportional
RH & T units ... 4 to 20 mA or 0 to 10 Vdc, 0 -100% Linear, Proportional
Polarity Protection...............................................................................Yes
Temperature Element (for Combination RH/T Units Only)
Application Temperature
Operating Temperature Jumper Selectable 32 to 122°F (0 to 50°C) or -31 to +95°F (-35 to +35°C)
32 to 122°F (0 to 50°C) or -31 to +140°F (-35 to +60°C)
Time Constant at 0 to 50°C and 10 to 80% RH Approx. 20 seconds in moving air
Accuracy at 59 to 95°F (15 to 35°C): ±0.8 K
at 31 to 122°F (-35 to +50°C): ±1 K
at 31 to 140°F (-35 to +60°C): ±1 K
Output Signal 4 to 20 mA or 0 to 10 Vdc, 0 -100% linear, proportional, (terminal U2)
Calibration Adjustments None
Sensors
QFAx1 Series Product Ordering
Application RH Description Part No.
Room/Outdoor Air Humidity 2% 0 to 10 Vdc QFA3100
Room/Outdoor Air Humidity 2% 4 to 20 mA QFA3101
Room/Outdoor Air Humidity & Temperature 2% 0 to 10 Vdc / Temp 0 to 10 Vdc QFA3160
Room Air Humidity & Temperature 2% 0 to 10 Vdc / Temp 0 to 10 Vdc with Display QFA3160D
Room/Outdoor Air Humidity & Temperature 2% 4 to 20 mA / Temp 4 to 20 mA QFA3171
Room Air Humidity & Temperature 2% 4 to 20 mA / Temp 4 to 20 mA with Display QFA3171D
Room/Outdoor Air Humidity & Temperature 2% 4 to 20 mA / Temp 4 to 20 mA (Certied) QFA4171
Room Air Humidity & Temperature 2% 4 to 20 mA / Temp 4 to 20 mA (Certied) with Display QFA4171D
Room Outdoor Air Humidity & Temperature 2% 0 to 10 Vdc, Temp 0 to 10 Vdc (Certied) QFA4160
Room Air Humidity & Temperature 2% 0 to 10 Vdc, Temp 0 to 10 Vdc (Certied) with Display QFA4160D
QFAx1 Series Accessories
Description Part No.
Outdoor Air Sunshield AQF3100
Remote Sensing Cable, 10 Foot AQY2010
Remote Sensing Cable, 30 Foot AQY2030
Accessories & Service Kits
www.usa.siemens.com/hvac
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