1. About this document
1.1 Version information
This document provides instructions for installing, operating, and maintaining Vaisala
HUMICAPâ Humidity and Temperature Module HMM170.
Table 1 Document versions (in English)
Document code Date Description
M212259EN-D June 2021 This manual.
Added sections:
• HUMICAP technology (page 13)
• Condensation prevention functions (page 14)
• Cleaning HUMICAP 180L2 sensor (page 22)
• FCC Part 15 compliance statement (page 47)
Updated sections:
• Output parameters (page 9)
• Chemical purge (page 13)
• Cleaning probe (page 22)
• HMM170 specifications (page 26)
• Measurement data registers (page 34)
• Status registers (page 40)
• Modbus communication examples (page 44)
M212259EN-C April 2020 Previous version. Updated technical specification, installation
instructions, and Modbus reference appendix. HMM170 now
supports 24 V AC supply voltage, starting from serial number
S1231134.
M212259EN-B October 2019 Updated section Output parameters (page 9). Updated
technical specification. Removed content related to MI70
handheld indicator.
1.2 Related manuals
Table 2 Related manuals
Document code Name
M212260EN Vaisala HMM170 Quick Guide
M210185EN Vaisala HMK15 User Guide
Chapter 1 – About this document
5
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