Chapter 2 __________________________________________________________ Product Overview 
VAISALA_______________________________________________________________________ 17 
CHAPTER 2 
PRODUCT OVERVIEW 
This chapter introduces the features, advantages, and the product 
nomenclature. 
Introduction to HMT310 
The Vaisala HUMICAP
®
 Humidity and Temperature Transmitter 
HMT310 is a small size humidity and temperature transmitter that 
powers up with 12 ... 35 VDC. Output alternatives are analog outputs 
0/4 ... 20 mA and an RS-232 serial line. The following optional functions 
are available: 
-  Several probes for various applications 
-  Calculated humidity quantities 
-  Different mounting kits, sensor protection options and probe cable 
lengths 
-  Warmed probe and sensor heating for high humidity conditions 
(HMT317) 
-  Chemical purge for applications where there is a risk of interfering 
chemicals in the measuring environment