Rotronic HF332-SB6XXXXX, HF320-WB6XXXXX, HF332-WB6XXXXX, HF332-DB6XXXXX, HF332-SB6XDXXX User manual

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

HygroFlex HF3

Transmitters

User Guide

Instruction Manual

Page

1 of 27

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

2 of 27

Table of contents

1 Overview ............................................................................................................................................... 3

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

2.1 Display option ..................................................................................................................................... 5

3 General description ............................................................................................................................. 6

3.1 Power supply ...................................................................................................................................... 6

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

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

3.4 Analog output signals (HF32 and HF33) ............................................................................................ 7

3.5 Service connector ............................................................................................................................... 8

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

4 User configurable settings and functions ......................................................................................... 9

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

4.2 Factory default settings .................................................................................................................... 11

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

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

5.2 Type D – through wall mount ........................................................................................................... 12

5.3 Type W – surface mount .................................................................................................................. 12

5.4 Type R and S – surface mount ......................................................................................................... 13

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

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

6.2 Cable grip and cable specifications .................................................................................................. 15

6.3 Wiring ............................................................................................................................................... 15

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

7.1 Minimum load requirements for the HF33 with voltage outputs ........................................................ 19

8 Maintenance ....................................................................................................................................... 20

8.1 Service cable .................................................................................................................................... 20

8.2 Location of the service connector (mini-USB type)........................................................................... 20

8.3 Periodic calibration check ................................................................................................................. 21

8.4 Cleaning or replacing the dust filter (type D and W) ......................................................................... 21

9 Firmware updates .............................................................................................................................. 21

10 Technical data .................................................................................................................................... 22

10.1 Specifications ................................................................................................................................... 22

10.2 Dew point accuracy .......................................................................................................................... 25

11 Accessories ........................................................................................................................................ 26

12 Supporting documents ...................................................................................................................... 26

13 Document releases ............................................................................................................................ 27

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

3 of 27

Applicability:

This manual applies to all in str uments of the HF3 serie s with firmw are version 3.0 or higher. Changes to the last
digit of the version nu mber refl ect min or firmware changes t hat do not affect t he man ner in w hich the instrument
should be operated.

1 Overview

The HF3 transmitters measure temperature, relative humidity and the dew or frost point. The HF3 series is
designed for fixed installation in cost sensitive HVAC applications where conditions are within the range of 0 to
100 %RH and -40 to 60°C (-40 to 140°F) and for units with display: -10 to 60°C (14 to 140°F).

The HF3 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 HF3 series offers the following user functions:

• User configurable settings

• Calculation of the dew or frost point

• Humidity temperature calibration and adjustment

• Simulator mode

• Automatic humidity sensor test and drift compensat ion

• Sensor failure mode

• Data recording

The ability for the user to easily update the AirChip 3000 firmware means that instruments of the HF3 series
can be kept up-to-date regarding any future functionality improvement.

HF3 transmitters: two types of electronic circuit are available: HF32: 2-wire, loop powered (4…20 mA current
signal) and HF33: 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. The HF3
transmitters can be used to measure humidity only, temperature only or both parameters.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

2 Mechanical configurat ions and dimensions

Instruction Manual

Page

4 of 27

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

5 of 27

2.1 Display option

The LC display option is available only with type R and type S mechanical configurations. The upper line of
the display corresponds to relative humidity or dew / frost point and the bottom line corresponds to
temperature.

The display can be configured to show a trend indicator o n 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-F2-002.

The display option for the HF33 has a backlight. The display option for the HF32 does not have a backlight.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

6 of 27

3 General description

3.1 Power supply

Depending on the circuit type, the HF3 requires the following power supply:
a) HF32 (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) HF33 (3-wire with analog outp ut s): 18 to 40 VDC (see note below) or 13 to 28 VAC. With both output

circuits closed, the maximum current con su mpti on is 60 mA for DC powered devices and 150 mA for AC
powered devices. HF3 with display and backlight have a current consumption up to 100 mA (DC
powered) / 250 mA (AC powered)

Note: depending on the type of output signal, the HF33 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

3.2 Measured parameters

The HF3 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 HF3 can be configured by the user to calculate either the dew point
or the frost point.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

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

0.2 mA

4…20 mA

No offset

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

7 of 27

3.4 Analog output signals (HF32 and HF33)

HF32 and HF33: with the ROTRONIC HW4 software any of the two analog output signals can be made to

correspond to one of the following:

• Relative humidity

• Temperature

• Dew or frost point

Any output can also be disable d.
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 and exhibit a small

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

HF33: 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
HF3 transmitter. These requirements are defined in the “Operation” chapter

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

8 of 27

3.5 Service connector

The service connector is a UART digital interfac e (Universal Asynchronous Receiver Transmitter) with a mini­USB type connector. This allows connecting the HF3 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. See “Maintenance” for the locatio n of the service connector and for the type of
service cable to be used.

• Connecting the HF3 to a PC is used to configure the HF3, gain access to the HF3 functions such as
humidity and temperature adjustment, read data from the HF3 on the PC and update the AirChip 3000
firmware.

• Connecting the HF3 to another instrument is useful only when the other instrument has its own display and
keypad (example HP23 hand-held calibrator). The connectio n allows showing the data measured by the
HF3 on the other instrument di splay and also allows using the other instrument internal menu to do for
example a humidity and temperature adjustment of the HF3.

3.6 Sensor protection (dust filter)

With the exception of models with the S configuration, the HF3 is supplied with a Polyethylene filter to protect
the sensors against dust particles and high air velocity.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

MEASUREMENT ACCURACY AND RELIABILITY

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

Bad (defective)

► Data recording

The data recording function differs from a true data logging

HW4 software, time stam ped and viewed

AirChip 3000 Functions

Description

► Simulator mode

Used to generate fixed values for the humidity, temperature and
calculated parameter. Can be configure d, enab led or disab le d

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

9 of 27

4 User configurable set ti ngs a nd f unctions

The HF3 ships configured as specified on the customer order. The HF3 can be installed and used just as any
conventional humidity and temperature transmitter and most users will never need to use the HF3
configurable settings and functions.

Making use of the HF3 configurable settings and functions is entirely up to the user and the appropriate
settings depend on the user application. We have provided below a short description of the HF3 functions and
also indicated the factory default settings.

4.1 Function overview

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

and optional drift compensation

MEASUREMENT LOOP VALIDATION

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 and is shown as Good, SQ-tuned (corrected for drift) or

function in the sense that the AirChip 3000 does not time stamp
the data. The data recording function can be used to investigate
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

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

AirChip 3000 Functions

Description

► Device write protection

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

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 the optional display

► Fail safe mode

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

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

DEVICE SAFEGUARDS

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

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 trigger a digital alarm which can be also be

Instruction Manual

Page

10 of 27

A bad humidity or temperature sensor triggers a digital alarm

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

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Configurable Settings

Applicability

Factory default

Unit system (Metric or English)

HF32, HF33

As per ordering code

Analog signal type (4…20 mA or other)

HF33

As per ordering code

Psychrometric calculation

HF32, HF33

As per ordering code

Output 1 parameter, scale and unit

HF32, HF33

As per ordering code (%RH or DP)

Temperature, unit as per ordering
code

Display resolution (optional)

HF32-S, HF33-S

1 decimal

Display backlight (optional)

HF33-S

Always on

Displayed parameters

HF32, HF33

As per ordering code

Trend indicator (display)

HF32-S, HF33-S

Enabled

Device name

HF32, HF33

Instrument model

Functions

Applicability

Factory default

Humidity / temperature adjustment

HF32, HF33

Device write protection

HF32, HF33

Disabled

Limit humidity output to 100 %RH

HF32, HF33

Enabled

Out-of-limit value digital / display alarm

HF32-S, HF33-S

Disabled

Enabled (loop mode – 10 min.
interval)

Automatic humidity sensor test

HF32, HF33

Disabled

Humidity sensor drift compensation

HF32, HF33

Disabled

Fail safe mode

HF32, HF33

Disabled

Simulator mode

HF32, HF33

Disabled

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

11 of 27

4.2 Factory default settings

Note: Configuration of the HF3 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
HF3 service connector to a USB port of the PC (see Maintenance > Service Cable).

Output 2 parameter, scale and unit HF32, HF33

Data recording HF32, HF33

o For a detailed description of all AirChip 3000 / HF3 main functions see document E-T-AC3000-DF-V1
o Instructions regarding the configuration of the HF3 and access to its functions are provided in the

following manuals:

E-M-HW4v3-Main
E-M-HW4v3-F2-002
E-M-HW4v3-DR-001
E-M-HW4v3-A2-001
E-M-AC3000-CP

.

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

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

12 of 27

5 Mechanical installa t 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 ured. Be cause 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 envir on me nt to be meas ured.

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 proximity of the probe to a heating element, a cooling coil, 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 Type D – through wall mount

Part AC5005 is a flange with compression fitting that is designed to hold the probe of the
HF3 type D when mounted through a wall (see Accessories). The HF3 does not require
any additional support. The AC5005 allows easy installation and removal of the HF3.

5.3 Type W – surface mount

The transmitter housing can be attached to the mounting wall using screws with an approximate diameter of 3
mm (1/8”).

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

5.4 Type R and S – surface mount

Instruction Manual

Page

Type R and type S consist of a base plate and
an electronics module that plugs into the base
plate. The base plate is installed and wired first.

The base plate should be installed with
terminals 1 to 4 placed on top. Preferably, use a
cable with 18 AWG wires.

Once the base plate has been installed and
wired, the electronics module can be inserted
and secured with the screw provided.

Note: dimensions in mm

13 of 27

5.4.1 Type S – Ventilation

Insufficient ventilation on the Sensor can result in an additional temperature measurement error of
+1,5 °C (self-heating effect).

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

14 of 27

6 Electrical installation

6.1 General guidelines

Power supply wiring

Heavy machinery and instrumentation should not share the same power supply wiring. If this cannot be
avoided, noise filters and surge protectors should 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 signa ls for PCs , print er s etc.

• shielded analog inputs

• unshielded direct current (<= 60V)

• shielded process signals (<= 25 V)

• unshielded alternate current (<= 25V)

• coaxial cables for CRT monitors

• direct current fr om 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

in common bundles or channels / conduits

in separated bundles or channels /
conduits, without minimum distance

in separated bundles or channels /
conduits, without minimum distance

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

15 of 27

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 Cable grip and cable specifications

Both type D and type W have one M16 sealing cable grip. This 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.

6.3 Wiring

6.3.1 HF32: 2-wire, loop powered transmitter

Electrical diagram

The maximum permissible cable length
connecting the HF32 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.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Terminals

Description

Temperature output (+)
OUT-2

V+

Power supply: 10…28 VDC (+)

Relative humidity or dew point (+)
OUT-1

V+

Power supply: 10…28 VDC (+)

Terminals

Description

1

Power supply: 10…28 VDC (+)

Temperature output (+)
OUT-2

3

Power supply: 10…28 VDC (+)

Relative humidity or dew point (+)
OUT-1

5

Not used

6

Not used

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Terminal block diagram for type D and W

T-OUT

H-OUT

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

Terminal block diagram for type R and S

Instruction Manual

Page

16 of 27

2

4

Note: connect the + of the power supply to only one of the
terminals 1 or 3. Terminals 1 and 3 are internally connected.

Measuring humidity or temperature only

Unless configured to measure either humidity only or temperature only, proper operation of the HF32 requires
both current loops to be closed. The HF32 can be directly ordered fr om the fact ory to meas ur e either hum idity
or temperature only. When necessary, any unused output of the HF32 can be disabled with the ROTRONIC
HW4 software. When the HF32 is configured with one of the two outputs disabled, close only the loop that is
being used.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Terminals

Description

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

GND

Power supply (-) or neutral

Relative humidity or dew point (+)
OUT-1

Temperature output (+)
OUT-2

GND

Ground (tied with other GND)

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

17 of 27

6.3.2 HF33: 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 HF3 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.

Terminal block diagram for type D and W

V+

OUT1

OUT2

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Terminals

Description

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

2

Power supply (-) or neutral / ground

Relative humidity or dew point (+)
OUT-1

Temperature output (+)
OUT-2

5

Not used

6

Not used

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

18 of 27

Terminal block diagram for type R and S

1

3

4

Measuring humidity or temperature only

Operation of the HF33 does not require both current loops to be closed. When using the HF33 to measure
either humidity only or temperature only, close only the loop that is being used.

If necessary, any unused output of the HF32 can be disabled with the ROTRONIC HW4 software.

6.3.3 Grounding (HF32, HF33)

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).

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

HF33 output signal

Input resistance RL

0…1V

>=1kOhm

0…5V

>=5kOhm

0…10V

>=10kOhm

HF33 signal

VCC

R pull-up

RL

0…1V

3.3V

≥ 250 kOhm

1 kOhm

HF33 signal

VCC

R pull-up

RL

0…1V

5.0V

≥ 400 kOhm

1 kOhm

0…5V

5.0V

≥ 400 kOhm

5 kOhm

HF33 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

HF33

Voltage Output

R Pull-up

RL

GND

VCC

HF33

Voltage Output

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

19 of 27

7 Operation

7.1 Minimum load requirements for the HF33 with voltage outputs

The following requirements apply to any external dev ic e or circuit connected to the HF33 transmitter with
voltage outputs:

In the situation where the external device uses an internal pull-up resistor the value of this resistor 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 HF33 voltage output.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Service connector

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

20 of 27

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. This cable does 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
HF3 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 HF3 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.

8.2.1 Type R and S

The service connector (UART interface) is located at the bottom of the transmitter, on the left side.

8.2.2 Type D and W

The service connector (UART interface) is located inside of the enclosure and can be accessed after
removing the cover.

HF32 HF33

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

21 of 27

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 HF3 should be verified every 6 to 12 months. Applications
where the HF3 is exposed to significant pollution may require more frequent verifications. Calibration and
adjustment of the HF3 can be done with either a PC with the HW4 software installed or with another
instrument such as the HP23 hand-held calibrator.

Procedure for calibrating or adjusting the HF3 with the ROTRONIC HW4 software:

o Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the

service connector of the HF3 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-HW4v3-
Main

o Start HW4 on the PC and search for the HF3 (HW4 Main Menu Bar > Devices and Groups > Search

for USB Masters).

o After finding the HF3 with HW4, expand the device tree to see the HF3 functions.

Select Probe Adjustment. Instructions for using the ROTRONIC calibration devices and humidity
standards are provided in document E-M-CalBasics

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

8.4 Cleaning or replacing the dust filter (type D and W)

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.

8.4.1 Validation of the output signals transmission

If so desired, transmission of the HF3 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 HF3
generates fixed digital and ana log sign al s as specified by the user. For instructions see HW4 manual

E-M-HW4v3-F2-002

9 Firmware updates

Firmware updates will be available on the ROTRONIC website for downloading. Firmware f iles are given 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 HF3 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

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

• Start HW4 software on the PC and search for the HF3 (HW4 Main Menu Bar > Devices and Groups

> Search for USB Masters).

• After finding the HF3, expand the device tree to see the HF3 functions. Select Device Manager. In
the Device Manager menu bar select Tools > Firmware Update. For instructions see HW4 manual
E-M-HW4v3-F2-002

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

General

HF32

HF33

Device type

Humidity temperature transmitter

Circuit type

2-wire, loop powered

3-wire

Mechanical configuration types

D, R, S and W

Power supply and connections

HF32

HF33

10…28VDC

resistance in ohms.

Nominal current consumption

2 x 20 mA

< 50 mA

Type D and W: terminal block and M16 cable grip
Type R and S: terminal block

Humidity measurement

HF32

HF33

Sensor

ROTRONIC Hygromer ® IN1

Measuring range

0…100 %RH

Measurement accuracy at 23 °C

±2.0 %RH (Type D, S and W) / ± 1.0 %RH (Type R)

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

HF32

HF33

Sensor

Pt100 RTD, IEC 751 1/3 class B

-40…60 °C / -40…140 °F

-10…60 °C / 14…140 °F (units with display)

Measurement accuracy at 23 °C

±0.3 °C (Type D, S* and W) / ±0.2 °C (Type R)

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

HF32

HF33

Psychrometric calculations

Dew or frost point (user configurable option)

Start-up time and data refresh rate

HF32

HF33

Start-up time

3.4s (typical)

1.9s (typical)

Data refresh rate

3.4s (typical)

1.7s (typical)

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

10 Technical data

10.1 Specifications

Supply voltage (VDD)

Electrical connections
Polarity protection Protective diode on V+

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

18…40 VDC or
13…28 VAC

Instruction Manual

Page

22 of 27

Measuring range

* Additional error in case of insufficient ventilation: +1,5 °C

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Configurable analog outputs

HF32

HF33

Output 1

Can be made to correspond to any parameter

Factory default parameter

Relative humidity or dew / frost point

Factory default scale

0…100 %RH or -50…50 °C DP or -50…100 °F DP

Output 2

Can be made to correspond to any parameter

Factory default parameter

Temperature

Factory default scale

0…50 °C or 0… 100 °F

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…20mA 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 (service connector)

HF32

HF33

Interface type

UART (Universal Asynchronous Receiver Transmitter)

Maximum service cable length

5 m (16.4 ft)

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Signal type 4…20 mA

Maximum offset at bottom of
signal range

no offset

Instruction Manual

Page

4… 20 mA
0… 1 V
0… 5 V
0… 10 V

0…5V signal range: 50 mV
0…10V signal range: 100 mV
0…20mA signal range: 0.2 mA

23 of 27

Minimum external load 0 Ω

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

Find Quality Products Online at: [e-mail]

© 2009-2016; Rotronic AG E-M-HF3-V1_24

www.GlobalTestSupply.com

E-M-HF3-V1_24

General specifications

HF32

HF33

LC, 1 or 2 decimals
trend indication

Probe material

Polycarbonate, except type R and S

Probe dust filter material

Polyethylene, except type R and S

Housing material

ABS

Housing protection grade

IP 65, except type R and S

Physical dimensions

See Models

Weight

90 g (3.1 oz)

Conformity with standards

HF32

HF33

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

HF32

HF33

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

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

Temperature limits at probe

-40…+60 °C

Maximum humidity at sensor

100 %RH

Maximum air velocity at probe

20 m/s (3,935 ft /min), except type R and S

Critical environments

Humidity sensor: as per DV04-14.0803.02 – Critical chemicals

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Optional display
(S and R configurations only)

CE / EMC imm unity

resolution, no backlight,

Instruction Manual

Page

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

24 of 27

Storage and transit

Operating limits at electronics

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

25 of 27

10.2 Dew point accuracy

The HF3 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 10 ˚C, a dew point value of 0 ˚C is measured with an accuracy of
± 1.0 ˚C or better.

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

Document File Name

Contents

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

HW4 software version 3: HF3 transmitt ers and hy grost ats
Device configuration and AirChip 3000 functions

Temperature and humidity adjustment basics
Instructions for using the ROTRONIC humidity standards

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 Transmitters: User Guide

Instruction Manual

Page

26 of 27

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 Supporting documents

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-F2-002

E-M-HW4v3-A2-001

E-M-HW4v3-DR-001

E-M-AC3000-CP

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 Adjust ment fun ctio n AirCh ip 3000 dev ice s

HW4 software version 3: Data Recording Function AirChip 3000 Devices

AirChip 3000 Communication Protocol

Humidity Definitions

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

E-M-HF3-V1_24

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

HF34 removed (discontinued)

Drawing of terminal block updated

Rotronic AG
Bassersdorf, Switzerland

HygroFlex HF3 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

Update for firmware v3.0

_23 Jan. 13. 2014

_24 April 2016 Update Type S

Specification of power supply updat ed
Offset of analog outputs updated

Instruction Manual

27 of 27

© 2009-2016; Rotronic AG E-M-HF3-V1_24

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com