Rotronic HF420-DB6XXXXX, HF432-WB6XDXXX, HF420-DB6XDXXX, HF432-WB6XXXXX, HF420-WB6XDXXX User manual

E-M-HF4-V1_24

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Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

HygroFlex HF4

Humidity Temperatur e Transmitters

User Guide

Instruction Manual

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

Instruction Manual

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Table of contents

1

Overview .............................................................................................................................................. 3

2 Mechanical configurations and dimensions ..................................................................................... 4

2.1 Display and keypad option ............................................................................................................... 5

3 General description ............................................................................................................................. 5

3.1 Power supply .................................................................................................................................... 5

3.2 Measured parameters ...................................................................................................................... 6

3.3 Calculated parameters ..................................................................................................................... 6

3.4 Analog output signals (HF42 and HF43) .......................................................................................... 6

3.5 Digital interface (HF45) ..................................................................................................................... 7

3.6 Service connector ............................................................................................................................. 8

3.7 Sensor protection (dust filter)............................................................................................................ 8

4 User configurable settings and functions ......................................................................................... 8

4.1 Function overview ............................................................................................................................. 9

4.2 Factory default settings .................................................................................................................. 10

5 Mechanical installation ..................................................................................................................... 12

5.1 General guidelines .......................................................................................................................... 12

5.2 HF4 enclosure ................................................................................................................................ 12

5.3 Installation of the HF4 type D (through wall mount) ........................................................................ 12

5.4 Installation of the HF4 type W (surface mount)............................................................................... 13

6 Electrical installation ........................................................................................................................ 14

6.1 General wiring guidelines ............................................................................................................... 14

6.2 Guidelines for RS-485 wiring ( H F45) .............................................................................................. 15

6.3 Cable grip and cable specifications ................................................................................................ 15

6.4 Wiring ............................................................................................................................................. 15

7 Operation ........................................................................................................................................... 19

7.1 Minimum load requirements for the HF43 with voltage outputs ...................................................... 19

7.2 HF42 and HF43 transmitters (analog outputs)................................................................................ 19

7.3 HF45 (digital output) ....................................................................................................................... 20

7.4 Internal menu (optional keypad and display) .................................................................................. 21

7.5 Displayed parameters (optional keypad and display) ..................................................................... 21

8 Maintenance....................................................................................................................................... 22

8.1 Service cable .................................................................................................................................. 22

8.2 Location of the service connector (mini USB type) ......................................................................... 22

8.3 Periodic calibration check ............................................................................................................... 22

8.4 Cleaning or replacing the dust filter ................................................................................................ 23

8.5 Validation of the output signals transmission .................................................................................. 23

9 Firmware updates .............................................................................................................................. 24

10 Technical data ................................................................................................................................... 25

10.1 Specifications ................................................................................................................................. 25

10.2 Dew point accuracy ........................................................................................................................ 27

11 Accessories ....................................................................................................................................... 28

12 Supporting documents ..................................................................................................................... 28

13 Document releases ........................................................................................................................... 29

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Transmitters: User Guide

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Applicability:

This manual applies to all instruments of the HF4 series with firmware version 3.0 or higher. 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 HF4 transmitter measures temperature, relative humidity and the dew or frost point. The HF4 series is
designed for fixed installation in HVAC and light indust ria l applications where a high measurement accuracy is
required at conditions within the range of 0 to 100 %RH and -50 to 100°C (-58 to 212°F). The electronics
operating range is limited to -40…60 °C (-10…60°C with the optional LC display).

The HF4 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 HF4 series 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

• Fail safe mode

• Data recording

The ability for the user to easily update the AirChip 3000 firmware means that instruments of the HF4 series
can be kept up-to-date regarding any future functionality improvement.

HF4 transmitters with analog output signals: two types of electronic circuit are available: HF42: 2-wire,
loop powered (4…20 mA current signal) and HF43: 3-wire (voltage or current signal). Both circuit types
provide linear analog outputs 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.

HF4 transmitters with digital output: the HF45 is available with the following digital interface options: RS­485, 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.

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Models with USB or Ethernet interface

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

2 Mechanical configurat ions and dimensions

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

2.1 Display and keypad option

The LC display option for the H F43 and HF45 has a
backlight. The LC display option for the HF42 does
not have a backlight.

The upper line corresponds to relative hum idi ty or
dew / frost point and the bottom line corresponds to
temperature.

The display can be configured to show a trend indicator on each line:

▲: increasing value
▼: decreasing value

In the event of an alarm the display shows the symbol [ ! ] to the right of the value.
For instructions see the following HW4 manual: E-M-HW4v3-F2-003.

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3 General description

3.1 Power supply

Depending on the circuit type, the HF4 requires the following power supply:
a) HF42 (2-wire, loop powered): 10… 28 VDC - depending on the load connected to the output(s). The

minimum supply voltage can be determined as follows:
V min = 10 V + (0.02 x Load*) *Load resistance in ohms.
For the maximum load of 500 Ω, the minimum supply voltage is 10 + (0.02 x 500) = 20 VDC. With both

output circuits closed, the maximum current consumption is 40 mA.

b) HF43 (3-wire with analog outputs): 18 to 40 VDC (see note below) or 13 to 28 VAC. With both output

circuits closed and enabled backlight, the maximum current consumption is 100 mA for DC powered
devices and 260 mA for AC powered devices.

Note: depending on the type of output signal, the HF43 will operate with the following minimum voltage
0…1 V outputs: 6 VDC or 5 VAC

0…5 V outputs: 10 VDC or 8 VAC
0…10 V outputs: 18 VDC or 13 VAC
0…20 mA or 4 …20 mA outputs: 6 VDC or 5 VAC with 0 Ω load
18 VDC or 13 VAC with 500 Ω load

c) HF45 (3-wire) with digital outputs: 6 to 40 VDC or 5 to 28 VAC. Maximum current consumption:

Model with USB interface: 100 mA (DC powered), 260 mA (AC powered)
Model with Ethernet (TCP/IP) interface: 220 mA (DC powered), 350 mA (AC powered)

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Signal type

Maximum offset at range bottom

0…1 V

10 mV

0…5 V

50 mV

0…10 V

100 mV

0…20 mA

0.26 mA

4…20 mA

No offset

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

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3.2 Measured parameters

The HF4 measures relative humidity with a ROTRONIC Hygromer® IN1 capacitive sensor and temperature
with a Pt100 RTD.

3.3 Calculated parameters

Using the ROTRONIC HW4 software, the HF4 can be configured by the user to calculate either the dew point
or the frost point.

3.4 Analog output signals (HF42 and HF43)

HF42 and HF43

With the ROTRONIC HW4 software any of the two analog ou tput sign als can be made to correspond to one of
the following:

• Relative humidity

• Temperature

• Dew or frost point

Any output can also be disabled.
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.
The D/A converters used to generate the analog output signals feature a 16-bit resolution and exhibit a small

positive offset at the bottom of the signal range as indicated below:.

HF43

The ROTRONIC HW4 software allows changing the type of output signal to one of the following: 0…20 mA,
4…20 mA, 0…1V, 0…5V or 0…10V. Both output signals are automatically configured with the same signal
type. No calibration or adjustment is required after changing the type of output signal.

In the case of voltage output signals, load requirements apply to the external device or circuit connected to the
HF43 transmitter. These requirements are defined in the “Operation” chapter

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3.5 Digital interface (HF45)

a) RS-485 serial interface

The HF45 has always a RS-485 serial interface. When the number of available network ports is limited, this
interface can be used to connect together up to 64 devices in a multi-dropped arrangement. In principle, an
unlimited number of such networks can be monitored with the HW4 software, but each RS-485 multi-drop
network is limited to 64 devices. The HF45 can be used either as a slave or a master, without special
configuration. The master is automatically the device that is directly connected to a network (PC or LAN) by
means of a USB port or TCP/IP port.

RS-485 Compatibility: The communication protocol used by the HF45 and other AirChip 3000 products is not
compatible with the protocol used by the previous generation of ROTRONIC instruments. Do not connect
legacy products and AirChip 3000 products to the same RS-485 multi-drop network.

b) USB or Ethernet interface

The HF45 is also available with the following interface combinations: USB + RS-485 or Ethernet +RS-485. In
that case the protection grade of the HF4 enclosure is no longer IP65 / NEMA 4 rated.

c) Communication protocol options

The measurement data can be read without having to use the ROTRONIC HW4 software. Starting with
firmware version 1.3, the HF4 offers the following communication protocol options (ASCII) which can be
selected by connecting the HF4 to a PC running the ROTRONIC HW4 software (version 2.1.1 or higher):

o RO-ASCII: this is the standard (default) communication protocol used by all AirChip 3000 devices and by

the HW4 software. In principle, this protocol supports all of the AirChip 3000 functions but some of the
functions require a certain amount of computations to be carried out by an external device such as a PC.

o Custom: this communication proto col can be used to provide compatibility of the HF4 with an existing

communication system. The Custom communication protocol is limited to reading measurement data from
the HF4. Functions such as device configuration, humidity and temperature adjustment, etc. are not
supported. The Custom protocol is applicable to all AirChip 3000 devices with a digital interface and
allows RS-485 networking

o Modbus: the Modbus protocol available with the HF4 is limited to reading measurement data from the

HF4. Functions such as device configuration, humidity and temperature adjustment, etc. are not
supported by the Modbus protocol.

When using either the RO-ASCII or the Custom protocol, the HF4 can be set to send data automatically after
each refresh cycle without requiring a data request. When this mode is enabled, the receiving device must be
listening at all times in order to get the measurement data.

For details, see document E-M-AC3000-CP

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3.6 Service connector

The service connector is a UART digital interfac e (Univ er sal Asy nchro nous Receiver Transmitter) with a mini­USB type connector. This allows connecting the HF4 either to a PC running the ROTRONIC HW4 software or
to a probe input of another instrument that is compatible with the HygroClip 2 (HC2) probes. In both cases a
service cable is required. S ee “Maintenance” for the location of the service connector and for the type of
service cable to be used.

• Connecting the HF4 to a PC is used to configure the HF4, gain access to the HF4 functions such as
humidity and temperature adjustment, read data from the HF4 on the PC and update the AirChip 3000
firmware.

• Connecting the HF4 to the probe input of another instrument is useful only when the other instrument has
its own display and keypad, and has an internal menu equivalent to the menu of the HP23 hand-held
calibrator. The connection allows showing the data measured by the HF4 on the other instrument display
and also allows using the other instrument internal menu to do for example a humidity and temperature
adjustment of the HF4.

o HF45 (digital outputs): the digital interface (USB, Ethernet and RS-485) offers the same functionality as

the service connector but does not allow connecting the HF4 to a HP23 hand-he ld cal ibrator.

3.7 Sensor protection (dust filter)

The HF4 is supplied with a Polyethylene filter to protect the sensors against dust particles and high air
velocity.

4 User configurable settings and functions

The HF4 ships configured as specified on the customer order. Models with analog outputs can be installed
and used just as any conventional humidity and temperature transmitter and most users will never need to use
the HF4 configurable settings and functions. Model s with a digital interface generally require some
configuration by the user.

Making use of the HF4 configurable settings and functions is entirely up to the user and the appropr iat e
settings depend on the user application. We have provided below a short description of the HF4 functions and
also indicated the factory default settings.

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AirChip 3000 Functions

Description

► Humidity / temperature adjustment

o 1-point or multi-point humidity calibrat ion or adjus tme nt

o Generate calibration and adjustment protocols

► Automatic humidity sensor test

Tests the humidity sensor for drift caused by contaminants and

shown as Good, SQ-tuned (corrected for drift) or Bad (defective)

► Data recording

The data recording function differs from a true data logging

HW4 software, time stamped and viewed

AirChip 3000 Functions

Description

► Simulator mode

Used to make the HF4 generate fixed values for the humidity,
enabled or disabled

AirChip 3000 Functions

Description

► Device write protection

Used to protect the HF4 with a password to prevent
enabled or disabled

► Internal menu access from keypad

Used to prevent accidental changes to the HF4 settings and
the optional keypad. Can be enabled or disabled

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

4.1 Function overview

MEASUREMENT ACCURACY AND RELIABILITY

o 1-point or 2-point temperature calibrat ion or adjus tme nt
o Generate a time stamp for calibrations and adj ust ment s
o Retain and view last adjustment date and adjustment values

and optional drift compensat ion

can be used to automatically apply a correction. The test is
automatically carried out at regular interv a ls of time. Can be
configured, enabled, or disabled

The humidity sensor status can be verified either with the HW4
software or with the instrument display (if available) and is

function in the sense that the AirChip 3000 does not time stamp
the data. This data recording function can be used to investi gate
events such as a sensor malfunction as well as to retrieve data
that would otherwise be lost

o Start or stop data recording - up to 2000 value pairs (%RH

and temperature). Starting a recording session erases all
previously recorded data

o The recording mode and log interval can be specified
o When the device is powered off, the recording session is

paused but not ended As long as the recording se ss ion has
not been ended, the device automatically resumes recording
data when powered up again

o The recorded data can be downloaded to a PC with the

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MEASUREMENT LOOP VALIDATION

temperature and calculated parameter. Can be configured,

DEVICE SAFEGUARDS

unauthorized digital access by a digital user. Can be configured,

temperature-humidity adjustment by disabling the MENU key on

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AirChip 3000 Functions

Description

► Limit humidity output to 100 %RH

Used to prevent the humidity signal from exceeding
enabled or disabled

► Out-of-limit value alarm

Used to specify the normal range for humidity, temperature and

seen on the optional display

► Bad sensor alarm

Built-in function. Cannot be disabled

which can be also be seen on t he optio nal dis play

► Fail safe mode

Used to specify a "safe" fixed value for humidity and for
enabled or disabled

Configurable Settings

Applicability

Factory default

Unit system (Metric or English)

K

HF42, HF43, HF45

As per ordering code

Analog signal type (4…20 mA or
other)

Psychrometric calculation

HF42, HF43, HF45

As per ordering code

Output 1 parameter, scale and unit

HF42, HF43

As per ordering code (%RH or DP)

Temperature, unit as per ordering
code

Display resolution (optional)

HF42, HF43, HF45

1 decimal

Display backlight (optional)

K

HF43, HF45

Always on

Displayed parameters

K

HF42, HF43, HF45

As per ordering code

Trend indicator (display)

HF42, HF43, HF45

Enabled

Communication protocol

HF43 with DI, HF45

RO-ASCII

RS-485 address

HF43, HF45

0

TCP/IP settings

HF45

See document IN-E-TCPIP-Conf

Device name

HF43, HF45

Instrument model

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HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

PROCESS PROTECTION / PROTECTION OF OTHER DEVICES

100 %RH when condensation forms on the sensor. Can be

the calculated parameter depending on the user application.
Can be configured, enabled or disabled

Out-of-limit values tri gger a dig ital alarm which can be also be

A bad humidity or temperature sensor triggers a digital alarm

temperature in the event of a sensor failure. Can be configured,

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4.2 Factory default settings

Notes:

o Configuration of the HF4 by the user and access to its functions requires a PC with the ROTRONIC HW4

software (version 2.1.1 or higher) installed. Service cable AC3006 or AC3009 is used to connect the HF4
service connector to a USB port of the PC (see Maintenance > Service Cable). The HF45 can also be
connected to the PC using either its USB or Ethernet interface

o Settings and functions that can also be either partially or fully accessed from the optional keypad are

marked with the letter K (see also Operation > Internal Menu).

HF43 As per ordering code

Output 2 parameter, scale and unit HF42, HF43

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Functions

Applicability

Factory default

Humidity / temperature adjustment

K

HF42, HF43, HF45

Device write protection

HF42, HF43, HF45

Disabled

Menu access from keypad

HF42, HF43, HF45

Enabled

Limit humidity output to 100 %RH

HF42, HF43, HF45

Enabled

Out-of-limit value digital / display
alarm

Enabled (loop mode – 10 min.
interval)

Automatic humidity sensor test

HF42, HF43, HF45

Disabled

Humidity sensor drift compensation

HF42, HF43, HF45

Disabled

Fail safe mode

HF42, HF43, HF45

Disabled

Simulator mode

HF42, HF43, HF45

Disabled

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HF42, HF43, HF45 Disabled

Data recording

o For a detailed description of all AirChip 3000 / HF4 main functions see document E-T-AC3000-DF-V1
o Instructions regarding the conf igur at ion of the HF4 and ac cess to its functio ns are provided in the

following manuals:

E-M-HW4v3-Main
E-M-HW4v3-F2-003
E-M-HW4v3-DR-001
E-M-HW4v3-A2-001
E-M-AC3000-CP

.

o Instructions for configuring the TCP/IP settings of the HF45, are provided in document

E-M-TCPIP-Conf

o The factory default setting for dew / frost point calculation is frost point below freezing

K

HF42, HF43, HF45

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Vertical:

HF42 and HF43 type D
without keypad and display

Horizontal:

HF42 and HF43 type D with
keypad and display

HF45 type D

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5 Mechanical installat ion

5.1 General guidelines

Relative humidity is extremely dependent on temperature. Proper measurement of relative humidity requires
that the probe and its sensors be at exactly the temperatur e of the environ me nt to be meas ur ed. Beca use of
this, the location where you choose to install the probe can have a significant effect on the performance of the
instrument. The following guidelines should guarantee good instrument performance:

a) Select a representative location: install the probe where humidity, temperature and pressure

conditions are representative of the environment to be measured.

b) Provide good air movement at the probe: air velocity of at least 200 ft/ minute (1 meter/second)

facilitates adaptation of the probe to changing temperature.

c) Avoid the following: (1) Close proxim ity of the probe to a heating element, a cooling coi l, a cold or

hot wall, direct exposure to sun rays, etc. (2) Close proximity of the probe to a steam injector,
humidifier, direct exposure to precipitation, etc. (3) Unstable pressure conditions resulting from

excessive air turbulence.
d) Immerse as much of the probe as possible in the environment to be measured.
e) Prevent the accumulation of condensation water at the level of the sensor leads. Install the

probe so that the probe tip is looking downward. If this is not possible, install the probe horizontally.

5.2 HF4 enclosure

The HF4 enclosure consists of a base and a cover held together with 4 screws. To open the enclosure, use a
metric 2.5 mm hex key. Prior to re-assembling the enclosure, verify that the red seal is sitting properly in its
groove on the base.

5.3 Installation of the HF4 type D (through wall mount)

Mounting position of the enclosure

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Horizontal:

HF42

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Mounting hardware

Part AC5005 is a flange with compression fitting that is designed to hold the probe of
the HF4 type D when mounted through a wall (see Accessories). The HF4 does not
require any additional support. The AC5005 allows easy installation and rem ov al of the
HF4.

5.4 Installation of the HF4 type W (surface mount)

Mounting position of the enclosure

, HF43 and HF45 type W

Mounting hardware

Method 1: The HF4 is supplied with 2 screws, 2 drywall anchors and two
rubber washers. The base of the enclosure has 2 screw-wells (see drawing)
that are normally closed at the bottom. Use the template provided with the HF4
to drill mounting holes in the wall and insert the drywall anchors. Place a rubber
washer on each screw. Insert a screw in each well and push to open the
bottom of the well.

Method 2: When a DIN-rail (35 mm / 1 3/8 “) is available use part AC5002 (not
included). This is a DIN-rail mounting kit consisting of 2 clamps that attach to
the back of the enclosure with the screws provided.

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6 Electrical installation

6.1 General wiring guidelines

Power supply wiring

Heavy machinery and instrumentation should not share the sam e power supply w iring. If this cannot be
avoided, noise filters and surge protectors shou ld be used. Most UPS devices have those features already
integrated.

General guidelines for signal cables

The following guidelines are derived from European Standard EN 50170 for the transmission of signals by
copper wires. When planning an installation, the rules provided by EN 50170 should be followed under
consideration of local circumstances to determine the position of machines and equipment.

All ROTRONIC products are tested for Electromagnetic Compatibility according to EMC Directive
2004/106/EG and following European standards:

- EN 61000-6-1: 2001, EN 61000-6-2: 2005

- EN 61000-6-3: 2005, EN 61000-6-4: 2001 + A11

Whenever the level of electromagnetic interference is expected to be high, both the instruments and signal
cables should be placed as far away as possible from the source of interference.

In general, signal cables should be installed in bundles or channels / conduits, separate from other cables as
indicated in the table below:

• Bus signals such as RS485

• Data signals for PCs, printers etc.

• shielded analog inputs

• unshielded direct current (<= 60V)

• shielded process signals (<= 25 V)

• unshielded alternate current (<= 25V)

• coaxial cables for CRT monitors

• direct current from 60 V to 400 V

(unshielded)

• alternate current from 25V to 400 V
(unshielded)

• direct and alternate current > 400 V
(unshielded)

• Telephone lines

• lines leading into EX-rated areas

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in common bundles or channels / conduits

in separated bundles or channels /
conduits, without minimum distance

in separated bundles or channels /
conduits, without minimum distance

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Terminals

Description

Temperature output (+)
OUT-2

K2-1: V+

Power supply: 10…28 VDC (+)

Relative humidity or dew point (+)
OUT-1

K1-1: V+

Power supply: 10…28 VDC (+)

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Lightning protection

Cabling in areas with a risk of lightning requires a lightning protection. For cabling underground in between
buildings, we recommend the use of special fiber optic cables. If this is not possible, use copper cables that
are suitable for underground installation.

6.2 Guidelines for RS-485 wiring (HF45)

See document E-DV04-RS485.01: RS485 Network Installation and Start-up Guidelines

6.3 Cable grip and cable specifications

The HF4 is supplied either with one M16 sealing cable grip or with a ½” conduit adapter. The M16 cable grip
provides effective sealing only with cables having the proper outside diameter. Preferably, use a cable with an
outside diameter of 6 to 7 mm (0.236 to 0.275 inch) with 18 AWG wires.

6.4 Wiring

6.4.1

Electrical diagram

Terminal block diagram

HF42: 2-wire, loop powered transmitter

The maximum permissible cable length connecting
the HF42 to other devices is determined by the total
resistance resulting from the addition of the cable
resistance and that of the devices connected in series
with the unit. This resistance should not exceed 500
ohms.

K2-2: T-OUT

K1-2: H-OUT

Note: connect the + of the power supply to only one of the V+ terminals. The two terminals marked V+ are
internally connected.

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Measuring humidity or temperature only

Unless configured to measure either humidity only or temperature only, proper operation of the HF42 requires
both current loops to be closed. The HF42 can be directly ordered fr om the fact ory to meas ure eit her hum idity
or temperature only. When necessary, any unused output of the HF42 can be disabled with the ROTRONIC
HW4 software. When the HF42 is configured with one of the two outputs disabled, close only the loop that is
being used.

6.4.2 HF43: 3-wire transmitter

Electrical diagram for voltage outputs

The maximum permissible cable length can be
determined under consideration of the voltage drop
caused by the current flowing to the devices
connected to the unit. The voltage drop in the cable
depends both on cable resistance and on the
equivalent resistance of the devices connected in
parallel to the unit. The total resistance connected to
each unit output should be at least 1000 ohms.
Cable resistance should not be more than 1/1000 of

the load resistance.
Minimum load requirements apply to the external device or circuit connected to the HF4 transmitter. These

requirements are defined in the “Operation” cha pter

Electrical diagram for current outputs

The maximum permissible cable length, connecting
the unit to other devices, is determined by the total
resistance resulting from the addition of the cable
resistance and that of the devices connected in series
with the unit. This resistance should not exceed 500
ohms.

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Terminals

Description

Power supply (-) or neutral
(tied with other GND)

Power supply: 18…40 VDC (+)
or 13…28 VAC (Phase)

Temperature output (+)

Power supply (-) or neutral
(tied with other GND)

Power supply: 18…40 VDC (+)
or 13…28 VAC (Phase)

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Terminal block diagram

Type D and W (horizontal mount)

K1-1: GND

K1-2: V+

K1-3: -► Protective ground (see note below)

Type D (vertical mount)

K2-4: GND Ground (tied with other GND)

K2-3: GND Ground (tied with other GND)

K2-2: OUT2

K2-1: OUT1 Relative humidity or dew point (+)

K6-1: GND

K6-1: V+

K6-3: -► Protective ground (see note below)

Note: Terminals K1-3 or K6-3 (protective or earth ground) are tied with GND. If this is not wanted, a land
(B18) on the PCB must be removed.

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Terminals

Description

Power supply (-) or neutral
(tied with other GND)

Power supply: 6…40 VDC (+)
or 5…28 VAC (Phase)

RS-485 Bi-directional
TX- / RX -

RS-485 Bi-directional
TX+ / RX +

DC (+) 18…40 VDC (+)
(optional, see note below)

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Measuring humidity or temperature only

Operation of the HF43 does not require both current loops to be closed. When using the HF43 to measure
either humidity only or temperature only, close only the loop that is being used.

Using the ROTRONIC HW4 software, any unused output of the HF43 can be disabled.

6.4.3 HF45: digital output

Connectors and terminal block diagram

K1-1: GND

K1-2: V+

K1-3: -► Protective ground (see note below)

K3-4: D-

K3-3: D+

Notes:
Terminal K1-3: this terminal (protective or earth ground) is tied with GND. If this is not wanted, a land (B18)

on the PCB must be removed.
Terminal block K3 (RS-485): pins K3-1 and K3-2 can be us ed to pow er all instrum ents on a RS-485 multi-

drop from a single external 18 VDC power supply with adequate mA rating. In this case, do not use terminals
K3-1 and pin K1-2 (normally used to power the HF45).

WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.
Before connecting the HF4, make sure that it is properly configured for your network

K3-2: GND Ground / Power supply (-)

K3-1: PWR

6.4.4 Grounding (all models)

We generally recommend grounding the (-) side of the power supply, especially if the electronics will be
subjected to a low humidity environment (35 %RH or less).

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HF43 output signal

Input resistance RL

0…1V

>=1kOhm

0…5V

>=5kOhm

0…10V

>=10kOhm

HF43 signal

VCC

R pull-up

RL

0…1V

3.3V

≥ 250 kOhm

1 kOhm

HF43 signal

VCC

R pull-up

RL

0…1V

5.0V

≥ 400 kOhm

1 kOhm

0…5V

5.0V

≥ 400 kOhm

5 kOhm

HF43 signal

VCC

R pull-up

RL

0…1V

10.0V

≥ 1 MOhm

1 kOhm

0…5V

10.0V

≥ 1 MOhm

5 kOhm

0…10V

10.0V

≥ 1 MOhm

10 kOhm

RL

GND

HF43

Voltage Output

R Pull-up

RL

GND

VCC

HF43

Voltage Output

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7 Operation

7.1 Minimum load requirements for the HF43 with voltage outputs

The following requirements apply to any external device or circuit connected to the HF43 transmitter with
voltage outputs:

In the situation where the external device uses an internal pull-up resistor the value of this res istor should
meet the requirements shown below. It is also necessary to add a pull-down resistor RL connected to ground
in order to be able to read 100% of the range of the HF43 voltage output.

7.2 HF42 and HF43 transmitters (a nalog outputs)

If so desired, use the HW4 software to configure the HF4. Complete the mechanical and electrical installation
and simply power up the HF4.

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7.3 HF45 (digital output)

Configuration and full access to all HF45 functions requires a PC with the ROTRONIC HW4 software installed.
Starting with firmware version 1.3, the HF45 offers several communi cat ion prot o col options that allow users to

read the measurement data without the HW4 software. When using the standard RO-ASCII protocol, access
to some of the HF45 functions is also possible without HW4. For details, see document E-M-AC3000-CP.

IMPORTANT: Depending on the type of digital interface, either the PC or the HF45 must be configured
by the user as indicated below.

a) USB network connection

Prior to connecting the HF45 to a USB port you must install the ROTRONIC USB driver on the HW4 PC. For
instructions see the HW4 manual E-M-HW4v3-Main (§ 7.3)

b) Ethernet (TCP/IP) network connection (wired or wireless)

Prior to connecting the HF45 to an active Ethernet network you must configure the HF45 TCP/IP settings. For
instructions see the HW4 manual E-M-HW4v3-Main (§ 7.4) and technical note E-M-TCPIP-Conf

WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.
Before connecting the HF4, make sure that it is properly configured for your network

c) RS-485 serial interface (multi-drop)

Instructions for using the HF45 with a RS-485 network are provided in the following manuals:
E-M-HW4v3-Main (§ 7.5), E-M-HW4v3-F2-003 and E-DV04-RS485.01.

Notes:
o Instruments connected to the same RS-485 network must use the same baud rate and each instrument

must be given a unique RS-485 address

o RS-485 Compatibility: The communications protoco l used b y the HF45 and other AirChi p 3000 products

is not compatible with the protocol used by the previous generation of ROTRONIC products. Do not
connect legacy products and AirChip 3000 products to the same RS-485 multi-drop network.

The specifications of the RS-485 interface are as follows:
Baud rate : 19200

Parity : none
Data bits : 8
Stop bits : 1

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Main Menu

Menu Items

Selections / Information

Notes

Settings

Data recording (max. 2000
values)

Unit

°C / °F

Temperature / dew or frost point

Back Light

Key Press / On / Off

Display backlight mode

Device Information

Version

Firmware version

Serial Nbr

Serial number

Address

RS-485 address

Type

Device type

Name

Device name

User defined

SensorTest

Humidity sensor status

Off / Good / SQ-Tuned / Bad

Humidity Adjust

RefValue

Humidity reference value

± 0.1 %RH steps

<Adjust>

1-point adjustment only (offset)

Temperature Adjust

Temperature reference
value

<Adjust>

1-point adjustment only (offset)

MENU key: open / close menu

ENTER key: menu item selection

Menu navigation keys + / -

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7.4 Internal menu (optional keypad and display)

Note: Unauthorized access to the menu can be prevented by disabling the “display menu” setting
(use the HW4 software > Device Manager > Display)

Record

On / Off

Change value up / down

Document Type

RefValue

o Record: both the recording mode (start / stop and the log interval cannot be changed from the menu and

are as configured with the ROTRONIC HW4 software

o SensorTest: Off means that the humidity sensor has not been tested due to the configuration settings of

the test. For a description of the automatic humidity sensor test and drift compensation (SQ-tuning) see
documents E-T-AC3000-DF-V1 and E-M-HW4v3-F2-003

± 0.1 ˚C steps

7.5 Displayed parameters (optional keypad and display)

When the menu is not active, press the ENTER key to change which parameters are shown on the display:

o Relative humidity and temperature
o Dew / frost point and temperature (when the calculated parameter is enabled)

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HF32

Vertical mount: the service conne ctor is

located either on the left side or on the
right side of the enclosure.

Horizontal mount: the service
connector is located at the bottom of
the enclosure (black arrow)

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8 Maintenance

8.1 Service cable

IMPORTANT:

o Use service cable AC3009 with all 2-wire, loop powered transmitters. This cable powers up the

transmitter via the service connector. Do not use any other method for powering the transmitter when
using this cable AC3009 as this will create a ground loop and damage the transmitter. For the same
reasons do not use cable AC3006 with a 2-wire, loop powered transmitter.

o Use service cable AC3006 with all 3-wire transmitters as well as with digital models. This cable doe s

not provide power to the transmitter and the transmitter should powered separately when using this
cable

• Both cables AC3006 and AC3009 convert UART (service connector) to USB and are used to connect the
transmitter to a USB port of a PC running the ROTRONIC HW4 software. Prior to using any of these
cables, the ROTRONIC USB driver must be installed on the PC. Both the driver and the installation
instructions (document E-M-HW4v3-Main) are located on the HW4 CD.

• As an alternative, cable AC2001 is used to connect the HF4 to a probe input of the HP23 hand-held
calibrator. For service purposes, the HP23 offers essentially the same functionality as the HW4 software.

8.2 Location of the service connector (mini USB type)

WARNING: the service connector is a UART interface with a mini-USB connector type. Do not connect the

service connector directly to the USB port of a PC or hub.
The service connector can be accessed without opening the enclosure after removing the small red sealing

cover.

8.3 Periodic calibration check

Both the Pt 100 RTD temperature sensor and associated electronics are very stable and should not
require any calibration after the initial factory adjustment.

Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year.
For maximum accuracy, calibration of the HF4 should be verified every 6 to 12 months. Applications
where the HF4 is exposed to significant pollution may require more frequent verifications.

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a) Procedure for adjusting the HF4 from the optional keypad

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The optional keypad of the HF4 allows a 1-point adjust men t of te mpera ture or humi dity aga inst a
reference. A 1-point adjustment has the effect of adding the same offset to all measured values. A multi­point adjustment is not possible from the keypad and requires using either a PC with the HW4 software
installed or another instrument such as the HP23 hand-held cali br ato r.

• When the parameter to be adjusted is stable, press the MENU key to show the internal menu on the
display

• Use the (-) key to select either H-Adjust or T-Adjust and press the ENTER key

• Make sure that the text line beginning with RefValue is highlighted and press the ENTER key

• Use the (+) or (-) key to change the reference value as desired

• Use the (-) key to highlight the Adjust text line and press the ENTER key

• The HF4 confirms the adjustment with the message “Adjust OK”

• Press the MENU key twice to exit the menu and return the HF4 to normal operation

Notes:

o The calibration point is automatically deleted from the probe memory after an adjustment
o Because the HF4 has no real time clock, the date of the adjustment is not written to the HF4. If

retaining the adjustment date is important, use the HW4 software to adjust the HF4.

o Instructions for using the ROTRONIC calibration devices and humidity standards are provided in

document E-M-CalBasics

b) Procedure for adjusting the HF4 wi t h the ROTRONIC HW4 software:

• Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the
service connector of the HF4 to a USB port of a PC with the HW4 software installed. Note that the
ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual E-M-HW4v3­Main. In the case of the HF45, a connection with the PC can be established via the USB
(ROTRONIC USB driver) or Ethernet interface.

• Start HW4 on the PC and search for the HF4 (HW4 Main Menu Bar > Devices and Groups > Search
for USB Masters).

• After finding the HF4 with HW4, expand the device tree to see the HF4 functions.
Select Probe Adjustment. Instructions for using the ROTRONIC calibration devices and humidity
standards are provided in document E-M-CalBasics

• For further instructions see HW4 manual E-M-HW4v3-A2-001

8.4 Cleaning or replacing the dust filter

Depending on the application, the dust filter may require cleaning from time to time, Cleaning should be done
without removing the filter from the probe. Clean the filter with a fine brush. If this is not sufficient, the filter
should be replaced. To do this, unscrew the filter from the probe. Before putting on a new dust filter, check the
alignment of both sensors with the probe. The wires that connect the sensors to the probe are very thin and
bend easily. If this happens, correct the alignm ent by holdin g the sen sor very gently with a pair of small flat
nosed pliers.

8.5 Validation of the output signals transmission

If so desired, transmission of the HF4 output signals can be validated by using the simulator function. The
HW4 software is required to enable and configure this function. When this function is enabled the HF4
generates fixed digital and ana log signals as specified by the user. For instructions see document
E-M-HW4v3-F2-003

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9 Firmware updates

Firmware updates will be available on the ROTRONIC website for downloading. Firmware f iles are giv en a
name that shows both to which device the file applies and the version number of the firmware. All firmware
files have the extension HEX. Procedure for updating the firmware:

• Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the
service connector of the HF4 to a USB port of a PC with the ROTRONIC HW4 software installed.
Note that the ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual
E-M-HW4v3-Main. In the case of the HF45, a connection with the PC can be established via the
USB (ROTRONIC USB driver) or Ethernet interface.

• Copy the firmware update file from the ROTRONIC website to the PC.

• Start HW4 software on the PC and search for the HF4 (HW4 Main Menu Bar > Devices and Groups

> Search for USB Masters).

• After finding the HF4, expand the device tree to see the HF4 functions. Select Device Manager. In
the Device Manager menu bar select Tools > Firmware Update. For instructions see document
E-M-HW4v3-F2-003

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General

HF42

HF43

HF45

Humidity temperature
output

Circuit type

2-wire, loop powered

3-wire

Mechanical configuration types

D and W

Power supply and connections

HF42

HF43

HF45

10…28 VDC

resistance in ohms.

Model with USB

interface: 300 mA

Connector (USB or

or ½” conduit adapter

Humidity measurement

HF42

HF43

HF45

Sensor

ROTRONIC Hygromer ® IN1

Measuring range

0…100 %RH

Measurement accuracy at 23 °C

±1.0 %RH

Repeatability

0.3 %RH

Long term stability

< 1 %RH / year

Sensor time constant

Typical 10 sec, 63% of a 35 to 80 %RH step change (1m/sec air flow at sensor)

Temperature measurement

HF42

HF43

HF45

Sensor

Pt100 RTD, IEC 751 1/3 class B

Measuring range limits

-50…100 °C / -58…212 °F

Measurement accuracy at 23 °C

±0.2 °C

Repeatability

0.05°C

Long term stability

< 0.1°C / year

Sensor time constant

Typical 4 sec, 63% of a step change (1m/sec air flow at sensor)

Calculated parameters

HF42

HF43

HF45

Psychrometric calculations

Dew or frost point (user configurable option)

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10 Technical data

10.1 Specifications

Device type

Supply voltage (VDD)

Nominal current consumption 2 x 20 mA < 50 mA

Humidity temperature transmitter with analog output
signals

V min = 10 V + (0.02 x
Load*) *Load

18…40 VDC or
13…28 VAC

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transmitter with digital

6…40 VDC
or 13…28 VAC

interface: 50 mA
Model with Ethernet

Electrical connections

Polarity protection Protective diode on V+

Terminal block and M16 cable grip or ½” conduit
adapter

Ethernet), terminal block
(power supply and RS-

485) and M16 cable grip

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Start-up time and data refresh rate

HF42

HF43

HF45

Start-up time

3.4s (typical)

1.9s (typical)

1.9s (typical)

Data refresh rate

3.4s (typical)

1.7s (typical)

1.7s (typical)

Configurable analog outputs

HF42

HF43

Output 1

Can be made to correspond to any parameter

Factory default parameter

Relative humidity or dew / frost point

Factory default scale

As per ordering code

Output 2

Can be made to correspond to any parameter

Factory default parameter

Temperature

Factory default scale

As per ordering code

Output 1 and Output 2

0…20 mA

(user configurable)

User configurable scaling limits

-999.99 … +9999.99 engineering units

0…1V signal range : 10 mV

4…20 mA signal range : no offset

Short circuit tolerant

Yes

Maximum external load

500 Ω

500 Ω (current output)

1 kΩ (0…1 V output)

0 Ω (current output)

Digital interface

HF45

Interface type

RS-485, USB and RS-485 or Ethernet (TCP/IP) wired or wireless and RS-485

Service connector

HF42

HF43

HF45

Interface type

UART(Universal Asynchronous Receiver Transmitter)

Maximum service cable length

5 m (16.4 ft)

General specifications

HF42

HF43

HF45

LC, 1 or 2 decimals

indication

Probe material

Polycarbonate

Probe dust filter material

Polyethylene

Housing material

ABS

Housing protection grade

IP 65 (except HF45 – USB or Ethernet)

Physical dimensions

See Models

Weight

250 g (8.8 oz)

250 g (8.8 oz)

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Signal type 4…20 mA

Page

4… 20 mA
0… 1 V
0… 5 V
0… 10 V

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Maximum offset at bottom of
signal range

Mini mum external load 0 Ω

Optional display

no offset

resolution, no backlight,
trend and alarm

0…5 V signal range : 50 mV
0…10 V signal range : 100 mV
0…20 mA signal range : 0.26 mA

5 kΩ (0…5 V output)
10 kΩ (0…10 V output)

LC, 1 or 2 decimals resolution, backlight, trend and
alarm indication

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Conformity with standards

HF42

HF43

HF45

EMC Directive 2004/108/EG: EN 61000-6-1: 2001, EN 61000-6-2: 2005
EN 61000-6-3: 2005, EN 61000-6-4: 2001 + A11

Solder type

Lead free (RoHS directive)

Fire protection class

Corresponds to UL94-HB

FDA / GAMP directives

compatible

Environment a l limits

HF42

HF43

HF45

Storage and transit

-50…+70 °C / -20...+70 °C (models with display), 0…100 %RH, non condensing

Operating limits at electronics

-40 … +60 °C / -10….60 °C (models with display), 0…100 %RH, non condensing

Temperature limits at probe

-50…+100 °C (valid for type D)

100 %RH up to 80 °C (176 °F)
75 %RH at 100 °C (212 °F)

Maximum air velocity at probe

20 m/s (3,935 ft /min)

Critical environments

Humidity sensor: as per DV04-14.0803.02 - Critical chemicals

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CE / EMC imm unity

Maximum humidity at sensor

10.2 Dew point accuracy

The HF4 can be configured to calculate either the dew point or frost point based on the measurement of
relative humidity and temperature. The accuracy of this conversion varies, depending on the humidity and
temperature conditions as shown in the graph below:

Example: at a temperature of 20 ˚C, a frost point value of -25 ˚C is measured with an accuracy of
± 0.5 ˚C or better.

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Document File Name

Contents

HW4 software version 3: General instructions and functions common to all
devices

HW4 software version 3: HF4 transmitters
Device configuration and AirChip 3000 functions

Configuration procedures for ROTRONIC devices
with Ethernet (TCP/IP) interface

Humidity Definitions
Instructions for using the ROTRONIC humidity standards

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11 Accessories

For accessories and parts such as the HW4 configuration software, service cables, calibration accessories
and spare dust filters, please see document E-M-HC2-accessories

12 Supporti ng doc um e nt s

E-M-HC2-accessories

E-T-AC3000-DF-V1

E-M-HW4v3-DIR

E-M-HW4v3-Main

Accessories and parts for probes, indicators and transmitters

AirChip 3000 Description and Main Functions

List of the HW4 manuals

E-M-HW4v3-F2-003

E-M-HW4v3-A2-001

E-M-HW4v3-DR-001

E-M-AC3000-CP

E-DV04-RS485.01

E-M-TCPIP-Conf

E-M-CalBasics

E-T-HumiDefs

Note: All document file names have an extension corresponding to the document release number (example of

a first release: E-M-HW4v3-Main_10). This extension is not shown in the above table.

HW4 software version 3: Probe Adjustment function AirChip 3000 devices

HW4 software version 3: Data Recording Function AirChip 3000 Devices

AirChip 3000 Communication Protoc ol Options

RS485 Network Installat ion an d Start-up Guidelines

Temperature and humidity calibration basics

© 2009-2013; Rotronic AG E-M-HF4-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF4-V1_24

Document title

Updated this document regarding the model of service cable to
be used with 2-wire and 3-wire models.

Update for firmware v3.0
Update of offset specifications

Document code Unit

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF4 Humidity Temperature
Transmitters: User Guide

Page

13 Document releases

Doc. Release Date Notes

_20 Apr. 11, 2009 Original release
_21 Jun. 18, 2010 Updated document for HW4 software v.3

_22 Oct. 28, 2011

_23 Jan. 12, 2014

_24 Oct. 21, 2015 Update Zero offset specifications

Update of power supply specifications

Instruction Manual

Document Type

29 of 29

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© 2009-2013; Rotronic AG E-M-HF4-V1_24

www.GlobalTestSupply.com