Overview, E-m-hf7-v1_24, 1overview – ROTRONIC HF7 User Manual
Page 3
E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page 3 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
Applicability:
This manual applies to all instruments of the HF7 series with firmware version 1.x, where 1.x can be 1.0, 1.1,
etc. Changes to the last digit of the version number reflect minor firmware changes that do not affect the
manner in which the instrument should be operated.
1
Overview
The HF7 transmitter series are designed for fixed installation in industrial applications. The HF7 measures
relative humidity and temperature and can be configured to calculate the dew or frost point. Depending on the
model, the HF7 can measure environments within the range of 0 to 100 %RH and -100 to 150 C (-148 to
302 F). The electronics operating range is limited to -
50…100 °C (-58…212 °F)
Two types of electronic circuit are available:
HF72: 2-
wire, loop powered (4…20 mA current signal)
HF73: 3-wire (voltage or current signal).
Both circuit types provide linear analog outputs signals for transmission over a length of cable to a remote
display, recorder, controller or data processing unit and can be used to measure humidity only, temperature
only or both parameters.
The HF7 features well proven sensors and a robust housing. Digital signal processing ensures consistent
product performance and also facilitates the task of field maintenance with features such as potentiometer
free
– digital calibration.
Based on the ROTRONIC AirChip 3000 digital technology the HF7 series offers the following functions:
User configurable settings
Calculation of the dew or frost point
Humidity temperature calibration and adjustment
Simulator mode
Automatic humidity sensor test and drift compensation
Fail safe mode
Data recording
The ability for the user to easily update the AirChip 3000 firmware means that instruments of the HF7 series
can be kept up-to-date regarding any future functionality improvement.