Chapter 1 _________________________________________________________ General Information 
 
VAISALA _________________________________________________________________________ 9 
 
Safety 
The transmitter delivered to you has been tested and approved as shipped 
from the factory. Note the following precautions: 
WARNING 
-energized wires. 
 
CAUTION 
If you connect more than one transmitter to a single 24 VAC transformer, 
always connect the phase (~) to the +Vs connector in each transmitter.
 
 
CAUTION 
trimmers only turn 135 degrees each way, less than half a rotation. 
Do not force the trimmer past the stopping point.
 
 
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. It is possible to damage the product, 
however, 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: 
-  When installing the transmitter, do not touch exposed contacts on the 
component board. 
-  Handle ESD sensitive components on a properly grounded and 
protected ESD workbench. 
-  Always hold component boards by the edges and avoid touching the 
component contacts.