Vaisala HUMICAP HMP155 User's Guide download pdf (Page 13)

Chapter 2 __________________________________________________________ Product Overview

VAISALA _______________________________________________________________________ 11

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features, advantages, and the product

nomenclature of the Vaisala HUMICAP

Humidity and Temperature

Probe HMP155.

Introduction to HMP155

The HMP155 probe provides reliable humidity and temperature

measurement in a wide range of applications. Humidity measurement is

based on the capacitive thin film HUMICAP

polymer sensor.

Temperature measurement is based on resistive platinum sensors (Pt100).

Both the humidity and temperature sensors are located at the tip of the

probe, protected by a removable filter.

The HMP155 comes in active and passive output models where the

relative humidity voltage output is similar, but the temperature output is

either active or passive (resistive). Active output version has either two

analog outputs or an RS-485 digital output. Passive output version has 4-

wire temperature measurement and an analog voltage output for relative

humidity measurement.

The quantities measured by HMP155 are presented in Table 3 below.

The quantities calculated from the measured quantities are presented in

Table 4 on page 12.

NOTE

Calculated quantities are not available with the passive output version.

Table 3 Quantities Measured by HMP155

Quantity Abbreviation Metric

Unit

Non-Metric

Unit

Relative humidity (RH) RH %RH %RH

Temperature (T) T ºC ºF

Additional T-probe temperature

)

ºC ºF

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 83 84

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Vaisala HUMICAP HMP155 User's Guide Page 13