ROTRONIC HF65 - Manual (Page 3)

E-M-HF63_65-V1_11
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroFlex HF63/HF65 Humidity Temperature
Transmitters: User Guide
Document title
Page 3 of 34
© 2008; Rotronic AG E-M-HF63_65-V1_11
Applicability:
This manual applies to all instruments of the HF63 and HF65 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 HF6 transmitter series are designed for fixed installation in industrial applications. The HF6 measures
relative humidity and temperature and can be configured to calculate the dew or frost point. Depending on the
model, the HF6 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 -40…60 °C (-10…60°C with the optional LC display).
The HF6 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 HF6 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
• Sensor failure mode
• Data recording
The ability for the user to easily update the AirChip 3000 firmware means that HF63 and HF65 transmitters
can be kept up-to-date regarding any future functionality improvement.
HF63 transmitter with analog output signals: The HF63 features a 3-wire circuit with two voltage or two
current output signals corresponding to relative humidity, temperature or to the dew or frost point. The analog
outputs are linear and allow signal transmission over a length of cable to a remote display, recorder, controller
or data processing unit. As an option, the HF63 is available with a second Pt100 RTD installed on the probe.
When ordered with this option, the HF63 is supplied with an additional terminal block to allow a direct 4-wire
connection with the RTD.
HF65 transmitter with digital interface only: the HF65 is a digital transmitter available with the following
digital interface options: RS-485, USB + RS-485 or Ethernet (TCP/IP) + RS-485. Use of a digital interface
allows the simultaneous reading of relative humidity, temperature and calculated parameter. The
communication protocol used by the RS-485 interface offers several options that can be configured by the
user. This includes a Modbus compatible protocol.