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Q-Series 

Technical Instructions

Document No. 155-755

February 28, 2013

 

Relative Humidity and 
Relative Humidity & 
Temperature Sensors for 
Critical Environments 
and Outdoor Air 

     

    

 

 

Siemens Industry, Inc. 

Description 

The Q-Series Relative Humidity and Relative Humidity & Temperature Sensors for 
Critical Environments and Outdoor Air monitor and transmit changes in humidity and 
temperature to the building control systems. 

Features 

  Operating voltage 24 Vac/13.5 to 35 Vdc 

  Signal output 0 to 10 Vdc/4 to 20 mA for relative humidity and temperature 

  Very high measuring accuracy across the entire measuring range 

  Capacitive humidity measurement 

  Precise, stable humidity sensing 

  Available in 2% and 2%, certified models 

 Optional 

display 

  Recalibration service available (QFA41 Series only) 

Application 

The Q-Series Outdoor Air rh and rh/T Sensors are for use in HVAC applications where 
high accuracy and short response times for measuring relative humidity are required. 
The measuring range covers the entire humidity range of 0 to 100%. Some application 
examples: 

  Storage and production facilities in the paper, textile, pharmaceutical, food, chemical 

and electronics industry, etc. 

 Laboratories 

 Hospitals 

  Computer and EDP centers 

 Greenhouses 

  Outdoor use requires AQF3100 Outdoor Mounting Kit 

Summary of Contents for Q Series

Page 1: ...ure Very high measuring accuracy across the entire measuring range Capacitive humidity measurement Precise stable humidity sensing Available in 2 and 2 certified models Optional display Recalibration service available QFA41 Series only Application The Q Series Outdoor Air rh and rh T Sensors are for use in HVAC applications where high accuracy and short response times for measuring relative humidi...

Page 2: ... 24 Vac or 13 5 to 35 Vdc QFA4171 None QFA4171D 2 certified Yes Field selectable 32 F to 122 F 0 C to 50 C 31 F to 95 F 35 C to 35 C or 40 F to 158 F 40 C to 70 C Active 4 to 20 mA 0 to 100 Active 4 to 20 mA 13 5 to 35 Vdc Accessories 74 662 01040 US rigid 1 2 inch conduit adapter AQF3101 Sensor filter cap replacement AQF3150 Replaceable 2 sensor tip AQF4150 Replaceable certified sensor tip AQF310...

Page 3: ... active 0 to 10 Vdc or 4 to 20 mA output signal corresponding to a temperature range of 32 F to 122 F 31 F to 95 F or 40 F to 158 F 0 C to 50 C 35 C to 35 C or 40 C to 70 C The measuring range is selected by repositioning factory supplied jumpers Resistive Load Diagram Figure 1 Output Signal Terminal I1 I2 Mechanical Design The room sensor consists of housing printed circuit board connection termi...

Page 4: ...age at signal output U2 I2 is 0V 4 mA after 60 seconds The humidity signal at signal output U1 I1 increases to 10V 20 mA If the humidity sensor is faulty the voltage at signal output U1 I1 is 10V 20 mA after 60 seconds The temperature signal remains active Calibration Certificates QFA41 Series only The sensor and its exchangeable AQF4150 measuring tip are numbered registered and calibrated prior t...

Page 5: ... the north or northwest side of the building If possible mount in the middle of the wall at least 8 feet 2 5 meters above the ground Do not mount above or below windows above doors or ventilation shafts or below balconies or eaves Mounting Position The sensor and AQF3100 must be mounted in a vertical position with the sun shield at the top NOTE When using the AQF3100 outdoor mounting kit the senso...

Page 6: ...ment for combination rh T units only Operating temperature jumper selectable 32 F to 122 F 0 C to 50 C or 31 F to 95 F 35 C to 35 C 40 F to 158 F 40 C to 70 C Time constant 32 F to 122 F Approximately 20 s in moving air 0 C to 50 C and 10 to 80 rh Accuracy 32 F to 122 F 0 C to 50 C 1 8 F 1 C 31 F to 95 F 35 C to 35 C 1 4 F 0 8 C 32 F to 158 F 0 C to 70 C 1 8 F 1 C Output signal 4 to 20 mA or 0 to ...

Page 7: ...mens Industry Inc Page 7 Wiring Terminals QFA3100 QFA3101 QFA3160 QFA3160D QFA4160 QFA4160D QFA3171 QFA3171D QFA4171 QFA4171D Figure 3 Wiring Terminals QFA4160 QFA4160D Front View Connector fitted body removed QFA4171 QFA4171D Front View Connector fitted body removed Figure 4 Connectors Dimensions Figure 5 QFA31 Series Sensors with AQF3100 Dimensions in Inches Millimeters ...

Page 8: ...Product or company names mentioned herein may be the trademarks of their respective owners 2013 Siemens Industry Inc Siemens Industry Inc Building Technologies Division 1000 Deerfield Parkway Buffalo Grove IL 60089 USA 1 847 215 1000 Your feedback is important to us If you have comments about this document please send them to SBT_technical editor us sbt siemens com Dimensions Continued Figure 6 QF...

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