Chapter 1 ______________________________________________________General Information  
VAISALA
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Feedback 
Vaisala Customer Documentation Team welcomes your comments 
and suggestions on the quality and usefulness of this publication. If 
you find errors or have other suggestions for improvement, please 
indicate the chapter, section, and page number. You can send 
comments to us by e-mail: manuals@vaisala.com 
Product Related Safety Precautions 
The SPS311 delivered to you has been tested for safety and approved 
as shipped from the factory. Note the following precautions: 
WARNING 
Ground the product, and verify outdoor installation grounding 
periodically to minimize shock hazard. 
 
CAUTION 
Do not modify the unit. Improper modification can damage the 
product or lead to malfunction. 
 
ESD Protection 
Electrostatic Discharge (ESD) can cause immediate or latent damage 
to electronic circuits. Vaisala products are adequately protected 
against ESD for their intended use. However, it is possible to damage 
the product by delivering electrostatic discharges when touching, 
removing, or inserting any objects inside the equipment housing. 
To make sure you are not delivering high static voltages yourself: 
-  Handle ESD sensitive components on a properly grounded and 
protected ESD workbench. When this is not possible, ground 
yourself to the equipment chassis before touching the boards. 
Ground yourself with a wrist strap and a resistive connection cord. 
When neither of the above is possible, touch a conductive part of 
the equipment chassis with your other hand before touching the 
boards. 
-  Always hold the boards by the edges and avoid touching the 
component contacts.