Vaisala HMM100 - Manual (Page 13)

Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 11
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages, and the product
nomenclature of the HMM100.
Introduction to HMM100 Series Humidity
Modules
The HMM100 series humidity measurement modules are open frame
modules intended for integration into environmental chambers and other
chambers where high temperature tolerance is important. The modules
provide a single analog output channel for relative humidity (RH) or
dewpoint (T
d
). Dewpoint is the recommended quantity if the
measurement environment has significant temperature differences.
Table 3 Quantities Measured by HMM100
Quantity Range
Relative humidity (RH) 0 ... 100%
Dewpoint (Td) -20 ... +100 ºC (-4 ... +212 ºF)
All HMM100 modules include automatic temperature compensation
across the operating temperature range using an integrated PT1000
sensor. No external temperature compensation should be applied to the
output.
HMM100 modules do not incorporate probe heating or chemical purge
functionality. If the measurement environment is prone to condensation,
or likely to cause chemical contamination of the sensor, other Vaisala
instruments may be more suitable to the application.
The cable and probe of the HMM100 are attached at the factory. They
should remain connected to the module at all times; do not cut and re-
connect the cable.