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VAISALA ________________________________________________________________________ 3 
 
 
Table of Contents 
CHAPTER 1 
GENERAL INFORMATION............................................................................ 7 
About This Manual ................................................................... 7 
Contents of This Manual ....................................................... 7 
Version Information ............................................................... 8 
Related Manuals ................................................................... 8 
Documentation Conventions................................................. 8 
Safety......................................................................................... 9 
ESD Protection...................................................................... 9 
Recycling ................................................................................10 
Regulatory Compliances ....................................................... 10 
Patent Notice .......................................................................... 10 
Trademarks ............................................................................. 11 
License Agreement ................................................................ 11 
Warranty.................................................................................. 11 
CHAPTER 2 
PRODUCT OVERVIEW................................................................................ 13 
Introduction to DPT146.......................................................... 13 
Basic Features and Options.................................................. 14 
Transmitter Structure............................................................. 15 
Connection Cables................................................................. 16 
Loop-Powered Display (Optional) ........................................ 17 
Sampling Accessories (Optional)......................................... 18 
CHAPTER 3 
FUNCTIONAL DESCRIPTION..................................................................... 19 
Sensor Technology................................................................ 19 
MPS1 Multiparameter Sensor............................................. 19 
DRYCAP® Technology....................................................... 20 
Auto-Calibration ............................................................. 20 
Sensor Purge ................................................................. 20 
Sensor Warming in High Humidities .............................. 21 
BAROCAP® Technology .................................................... 21 
DPT146 Startup Sequence .................................................... 22 
CHAPTER 4 
INSTALLATION............................................................................................ 23 
Transmitter Configuration Before Installation .................... 23 
Selecting the Location........................................................... 24 
Installing the Transmitter ......................................................24 
Wiring ......................................................................................26