<< Click to Display Table of Contents >> Navigation:  Humidity & Temperature Devices > Transmitter > HF3A > Device Description

Overview

The Humidity and Temperature Advanced Transmitters HF3A are designed for fixed mounting in applications where good measurement accuracy is required.

 

Main features and benefits

•Good measuring accuracy and long-term stability

•Interval time of one second

•LED display of the operating status1

•Optional LCD display for measured parameters, errors, alarms and operating status

•Two analog output signals, freely configurable and scalable

•Permanently mounted humidity and temperature sensor as wall, duct and cable version

•New housing with high immunity to dust and moisture

•Service interface as primary communication interface

•NFC interface for communication with external devices

•Firmware updates over NFC-Interface and HygroSoft Software

•Optional digital version with RS485 digital Interface and MODBUS RTU communication protocol2

 

1 Not available with the HF3A-2

2 Available only with the HF3A-D

 

 

HygroFlex Transmitter Variants

There are 3 different transmitter variants available as a standard product, each available with or without display and 3 different mechanical installation. For special configuration requirements, customization is available across a wide range of possible settings. However, a minimum order quantity of 20 pieces is required.

 

 

 

Adjustment Points

The Probe is adjusted @23°C and 10, 35, 80%rh.

 

Start-Up

The typical start up time is for all HF3A around 5 seconds.

 

 

Measurement interval
The measuring interval of HF3A Advanced variants corresponds to 1 second

 

 

Current Consumption

HF3A-2:  The maximum current consumption is 2x23 mA.

HF3A-3 & HF3A-D: < 50 mA.

 

 

Analog output scaling and signal types

With the ROTRONIC HygroSoft software any of the two analog output signals for HF3A-3 and HF3A-D can be used as a current or voltage output for temperature measurement. For the HF3A-2 the output signal is available only as 4...20mA. By default for all HF3A the analog output 1 is used for the humidity and the output 2 is used for the temperature. Its scaling can be set within the numerical limits of -999.99 and 9999.99. The D/A converters used to generate the analog output signals feature bigger than 15-bit resolution.

 

 

Note: Both circuits have an internal polarity protection. Incorrect supply voltages as well as excessive loads on the outputs can damage the Transmitter.

 

Overview of Hygrosoft Functions

The device-specific configuration functions are detailed in the Chapter Hygrosoft below the section Supported devices:HF3A/TF5A

 

 

Simulator mode

A simulation value can be enabled for each measured parameter on a HygroFlex device. When a simulation value is activated, it replaces the current measured value with the defined value. This feature allows to test whether the HygroFlex device correctly processes a specified fictitious value. The simulation value can only be configured, activated, or deactivated via the NFC interface using the corresponding smartphone or PC application.

 

 

Status LED

The HF3A-3 and HF3A-D come with three default status LED colors, each indicating a different operational status. The HF3A-2, however, does not have a LED indicator.

 

 

 

 

Hierarchy of error messages

To achieve a normal operation status indicated by a green light, the following errors must be resolved:

 

•Serious errors (These prevent the device from functioning normally)

•Sensor errors

•Power, output, or scaling errors

•Simulator mode

•Alarm mode

 

In the event of a serious error, please disconnect the power supply and then reconnect the device. If the issue persists, contact Rotronic Support for further assistance.