ROTRONIC HF8 - Manual (Page 3)

E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide Instruction Manual
Document Type
Page 3 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
Applicability:
This manual applies to all instruments of the HygroFlex HF8 series with firmware version 2.x, where 2.x can
be 2.0, 2.1, 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.
Software compatibility warning
The HF8 with firmware version 2.x is designed for use with the ROTRONIC HW4 software version 3.2.0 or
higher. Do not try to configure the HF8 with any version of the ROTRONIC HW4 software lower than
2.4.0 as this will damage the HF8 firmware and prevent normal operation of the transmitter.
1 Overview
The HygroFlex HF8 transmitter series is designed for fixed installation in applications where high
measurement accuracy is required. The HF8 has two probe inputs which can be individually configured for
use with a HygroClip 2 plug-in probe or with a 1-channel analog probe.
The wide assortment of HygroClip 2 humidity-temperature probes can meet almost any application
requirement. The HygroClip 2 probes feature well proven, durable sensors. Digital signal processing within the
probe ensures consistent product performance and also facilitates the task of field maintenance with features
such as potentiometer free – digital calibration, hot-swapping of the probe, etc.
Depending on the HygroClip 2 probe model, the HF8 can measure conditions within the range of 0 to 100
%RH and -100 to 200
°C (-148 to 392°F). The HF8 can be configured to calculate a parameter as dew point,
enthalpy, mixing ratio, etc.
The HF8 can be ordered for different types of supply voltage, including DC voltage with galvanic separation
and is available with several combinations of analog output signals (up to 4), digital interface (RS-485,
Ethernet) and relay contacts (up to 4).
Based on the ROTRONIC AirChip 3000 digital technology the HF8 series and HygroClip 2 probes offer the
following user functions:
• User configurable settings
• Calculation of psychrometric parameters such as the dew or frost point
• Custom Calculations (user defined) such as the difference between dew point and temperature
• Humidity temperature calibration and adjustment
• Simulator mode
• Automatic humidity sensor test and drift compensation
• Sensor failure mode
• Data logging
The HF8 has an internal real time clock and can be used to record up to 10,000 pairs of relative humidity and
temperature values provided by a single HygroClip 2 probe or up to 10,000 data values provided by a single
1-channel analog probe. Data logging by the HF8 adds another layer of data protection when the HF8 is
connected to network.
The ability for the user to easily update both the HF8 and HygroClip 2 probe firmware means that instruments
of the HF8 series can be kept up-to-date regarding any future functionality improvement.