Manual

E-M-HF5-V1_25
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF5 Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
3 of 30
Document title
© 2009-2013; Rotronic AG E-M-HF5-V1_25
Applicability:
This manual applies to all instruments of the HygroFlex HF5 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 HygroFlex HF5 transmitter series is designed for fixed installation in applications where high
measurement accuracy is required and can be used with any of the HygroClip 2 plug-in probes. The most
basic HF5 models provide analog output signals corresponding to any two of the following: relative humidity,
temperature or calculated value such as dew point, enthalpy, mixing ratio, etc. Other models provide either a
digital interface and two analog output signals or a just a digital interface. The digital interface allows the
simultaneous reading of relative humidity, temperature and calculated value. Depending on the probe model,
the HF5 can measure conditions within the range of 0 to 100 %RH and -100 to 200 C (-148 to 392 F).
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.
Based on the ROTRONIC AirChip 3000 digital technology the HF5 series and HygroClip 2 probes offer the
following user functions:
User configurable settings
Calculation of psychrometric parameters such as the dew or frost point
Humidity temperature calibration and adjustment
1)
Simulator mode
Automatic humidity sensor test and drift compensation
1)
Sensor failure mode
1)
Data recording
1)
1) Except model HF52 (2-wire transmitter)
The ability for the user to easily update both the HF5 and HygroClip 2 probe firmware means that instruments
of the HF5 series can be kept up-to-date regarding any future functionality improvement.
HF5 transmitters with analog output signals and optional digital output: two types of electronic circuit are
available: HF52: 2-wire, loop powered circuit (4…20 mA current signal) and HF53: 3-wire circuit with voltage
or current signals. Both circuit types provide linear analog 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 HF53 (3-wire circuit type) can be ordered with two analog outputs
and either a RS-485 port or USB + RS-485.
HF5 transmitters with digital output only: the HF55 is available with the following digital interface options:
RS-485, USB + RS-485 or Ethernet (TCP/IP) + RS-485.