Device description

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Device description

Overview

The HygroFlex Advanced HF5A Transmitters are designed for fixed mounting in applications where high measurement accuracy is required and can be operated with different sensors. The wide range of HygroClip2 Advanced humidity and temperature probes, as well as probes equipped with MODBUS protocol such RMS-HCD-X (Humidity - Temperature), PCD-S-XXX (Differential Pressure) and RMS-TCD-S-001 (Temperature) meets almost all possible application requirements.

 

 

Main features and benefits

Interchangeable, plug-in HygroClip2 Advanced probe (sold separately)

Probe separation: Up to 5 m /16.4 ft (50m / 165 ft with a digital signal booster)

Relative humidity, temperature, dew point or other psychrometric parameter

High transmission accuracy and long-term stability

NFC-Interface for communication with the device

Firmware updates over NFC-Interface and HygroSoft Software

LED on front display of the operating status of the device1

The analog output signals are monitored2

Optional LCD display for measured parameters, errors, alarms and operating status1

Optional digital version with RS-485 digital Interface and MODBUS RTU communication protocol3

Optional galvanic isolation of power supply and analog outputs

Two analog output signals, freely configurable and scalable1

New housing, high immunity to dust and moisture within the device

 

1 Restricted with the HF5A-2 2-wire

2 Not available with the HF5A-2 2-wire

3 Only with HF5A-D 3-/4-wire

 

 

Variants

There are 3 different transmitter variants available, each available with or without display:

 

 

Variants

Description

Output

HF5A-21D0300210100

2-wire with Display

Analog 4...20 mA

HF5A-21X0000210100

2-wire without Display

Analog 4...20 mA

HF5A-31D0300210100

3-/4-wire with Display

Analog 0(4)...20 mA, 0...5(10) V

HF5A-31X0000210100

3-/4-wire without Display

Analog 0(4)...20 mA, 0...5(10) V

HF5A-D1D0300210100

3-/4-wire with Display

Analog 0(4)...20 mA, 0...5(10) V & Digital Modbus RTU

HF5A-D1X0300210100

3-/4-wire without Display

Analog 0(4)...20 mA, 0...5(10) V & Digital Modbus RTU

 

 

Power Supply

HF5A-21

The power supply is connected via K1-1-OUT1+ / K1-2-OUT1- and K1-3-OUT2+ / K1-4-OUT2- to the circuit and depends on the output load.

The minimal voltage:   HF5Aclip00017

In addition a reserve voltage of approx 6 Volt is added.

HF5Aclip00018 , HF5Aclip00019

 

First time Start up 2-wire

A 2-wire devices receives both its operating voltage and the control signal via the same two wires.

This means that the entire power supply and data communication takes place via just two wires.

 

The longer initial start up time for a 2-wire device is due to the fact that power cap has to be charged.

This capacitor stores energy and makes it available to the device to ensure stable and reliable operation.

After the initial charging phase, the device is fully functional and benefits from the additional stability provided by the power cap.

 

The improved starting behavior of the HF5A-2wire is as follows:

 

When power supply is first time applied to a HF5A-2, the inbuilt power condenser has to be loaded, before measurement values can be shown.

 

First time start up defined at 23 °C:

Display turns on after 10 sec.

No Display, Status LED blinks after 10 sec.

After 30 seconds Start Up time the measured values can be displayed

 

Note: The starting behavior of an HF5A-2 wire can be optimized with two separated power supply!

 

Faster charging of the Power Cap, due to higher current supply, as more energy is available

The device reaches the state in which the power cap is sufficiently charged more quickly to ensure  stable operation

 

 

 

HF5A-31 & HF5A-D1

The power supply is connected via K1-1-V- and K1-2-V+ to the circuit and depends from 18 VDC to a maximum of 36 VDC.

HF5Aclip00018 , HF5Aclip00019

 

First time Start up 3-/ 4-wire

Typical: < 3 sec.

 

 

Current Consumption

HF5A-21: When both Outputs are connected, the maximum current consumption is 50 mA.

HF5A-31 & HF5A-D1: When both Outputs are connected, the maximum current consumption is under 100 mA.

 

 

Load

Type

Power supply

Load

Output

2-wire

HF5A-21

18...36 VDC

Max. 500 Ω

4...20 mA

3- / 4-wire

HF5A-31

18...36 VDC

Max. 500 Ω

4...20 mA

0...20 mA

Min. 10 kΩ

0...5 V

0...10 V

 

HF5A-D1

Max. 500 Ω

4...20 mA

0...20 mA

Min. 10 kΩ

0...5 V

0...10 V

-

Digital RS485

 

 

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

 

 

General information

Functions

Description

Order code standard

HF5A-21D0300210100, HF5A-21X0000210100

HF5A-31D0300210100, HF5A-31X0000210100

HF5A-D1D0300210100, HF5A-D1X0300210100

Order code special

With a minimum order quantity of 20 pieces possible

Dimensions

134 x 94 x 52 mm

Housing material

Top: PC

Bottom: ABS

Weight

Display version: 277 g, Others: 270 g

Power Supply

Please see chapter Electrical Connections

Software

Configuration Software HygroSoft

NFC Interface

Equipped with an NFC Interface and can be accessed via a mobile phone or an NFC Reader equipped PC

Digital Interface

The digital version has an RS485 Interface (on screw terminal), where the device data can be processed with MODBUS protocol

 

 

Measured Parameters

The HygroFlex Advanced HF5A Transmitter can process up to 3 measured variables:

 

Depending on the connected sensor, 1 or 2 measured variables are sent to the transmitters.

For probes with 2 measured parameters, a psychrometric calculation can be carried out as a third measured variables.

 

 

Probes

Variants

Applicable Probes

Measured variables

HF5A-21

HC2 Probes

HC2A Probes

HCD Probes

Humidity

Temperature

Psychrometric calculation

TCD Probes

Temperature only

HF5A-31

HF5A-D1

HC2 Probes

HC2A Probes

HCD Probes

Humidity

Temperature

Psychrometric calculation

TCD Probes

Temperature only

PCD Probes

Differential Pressure

 

 

 

Measurement interval
The measuring interval of HygroFlex 5 Advanced variants:

 

Variants

Applicable Probes

Measurement interval

Analog Output refresh interval

HF5A-21

HC2 Probes

HC2A Probes

HCD-IC Probes

TCD Probes

4..10 sec.

4..10 sec.

HCD Probes

1 sec.

1 sec.

HF5A-31

HF5A-D1

HC2 Probes

HC2A Probes

HCD Probes

HCD-IC Probes

TCD Probes

1 sec.

1 sec.

 

 

 

Calculated parameters

Using the ROTRONIC HygroSoft software together with an NFC reader, the HF5A can be configured by the user to calculate one of the following parameters:

 

Dew Point (Cdp) above and below freezing

Frost Point (Fp) below freezing and dew point above freezing

Wet-bulb Temperature (Tw)

Enthalpy (H)

Vapor Concentration (Dv)

Specific Humidity (Q)

Mixing ratio by weight (R)

Vapor concentration at saturation (Dvs)

Vapor partial pressure (E)

Vapor saturation pressure (Ew)

Volume mixing Ratio

 

 

 

Analog Output signals

With the ROTRONIC HygroSoft software any of the two analog output signals can be made to correspond to one of the following:

 

• Relative humidity

• Temperature

• Calculated parameter

 

Any output can also be disabled.

 

HF5A-21D0300210100

2-wire with Display

Analog 4...20 mA

HF5A-21X0000210100

2-wire without Display

Analog 4...20 mA

HF5A-31D0300210100

3-/4-wire with Display

Analog 0(4)...20 mA, 0...5(10) V

HF5A-31X0000210100

3-/4-wire without Display

Analog 0(4)...20 mA, 0...5(10) V

HF5A-D1D0300210100

3-/4-wire with Display

Analog 0(4)...20 mA, 0...5(10) V & Digital Modbus RTU

HF5A-D1X0300210100

3-/4-wire without Display

Analog 0(4)...20 mA, 0...5(10) V & Digital Modbus RTU

 

Output Scale:

The scale of each analog output 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 a 16-bit resolution.

 

 

Signal Type:

Both analog outputs provide the same type of signal. With the exception of the HF5A-2 (always 4…20 mA), the type of signal can be selected with the ROTRONIC HygroSoft software to any of the following:

Current output: 0…20 mA, 4…20 mA.

Voltage output: 0…1V, 0…5V or 0…10V.

 

 

Load

Type

Power supply

Load

Output

2-wire

HF5A-21

18...36 VDC

Max. 500 Ω

4...20 mA

3- / 4-wire

HF5A-31

18...36 VDC

Max. 500 Ω

4...20 mA

0...20 mA

Min. 10 kΩ

0...5 V

0...10 V

 

HF5A-D1

Max. 500 Ω

4...20 mA

0...20 mA

Min. 10 kΩ

0...5 V

0...10 V

-

Digital RS485

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

 

 

Simulator mode

A simulation value can be activated for each measured value if a HygroFlex device. If a simulation value is activated for a measured value,

the set simulation value is used instead of the current measured value. This allows you to test whether the corresponding HygroFlex device

processes a defined fictitious measured value correctly. The simulation value can only be set, switched on and off via the NFC interface and the

corresponding mobile phone or PC application.

 

 

Display mode

The HygroFlex devices have a multi-colored LED for displaying device statues and, optionally , an LC display for displaying all possible device statues.

For the error display the user can choose between a detailed and a simple error display. The selection is made in the properties of the device.

 

 

Status LED

The HF5A has per default 3 different status LED light colors, which are indicating 3 different statuses.

The 3/4-wire or digital version of the HF5A are permanently illuminated.

The HF5A 2-wire version has only a flashing light.

 

Green stands for normal operation:

 

 

Orange stands for simulation mode:

 

 

 

Red stands for error mode:

 

 

In addition to the simple or standard status lighting, the HF5A offers a special flashing pattern (particularly useful for devices without a display), which can provide the user with more detailed error descriptions.

See more: LED status light

 

 

Hierarchy of error messages

 

In order to get the normal operation status Green, the following errors have to be resolved:

 

Serious errors (Serious errors are errors that prevent the regular operation of the device)

Probe & Sensor errors (Probe errors are errors of the connected probe that must be resolved before the device can resume regular operation)

Power errors / Output errors and scaling errors (Output errors in case no load is on current output(only with a 3- and 4-wire), or out of scaling)

Alarm mode

Simulator mode

Normal Operation

 

In case of a serious error, please disconnect the power supply and re power the device again.

If the failure still exist you may get in contact with Support department.

 

 

For example:

If an RMS-TCD-S-001 is mounted on the transmitter, and the Output 2 is not used, it is necessary to change the Output2 to unused within the HygroSoft software, otherwise

the device will show you a constant error mode.

 

 

To prevent an error message within the current Output Monitoring, the current version should have at least a 100 Ohm Resistor applied to the OUT1- and OUT2-.

See more: Probe Error Messages Operation Error Messages Simulator and Alarm Output Monitoring