Technical Instructions  Q-Series Outdoor Air and Critical Environment  
Document Number 155-755  Relative Humidity and Relative Humidity & Temperature Sensors 
February 28, 2013 
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as 
design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. 
© 2013 Siemens Industry, Inc. 
Siemens Industry, Inc. 
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Dimensions, 
Continued 
 
Figure 6.  QFA31 Series Dimensions in Inches (Millimeters). 
 
 
Figure 7.  QFA41 Series Sensors Dimensions in Inches (Millimeters). 
 
 
 
Document No. 155-755 
Printed in the USA 
Page 8