Page 1
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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1 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
HygroFlex HF732A
Humidity Temperature Transmitters
User Guide
Page 2
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
2 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
Table of contents
1 Overview .............................................................................................................................................. 3
2 Mechanical configurations and dimensions ..................................................................................... 4
3 General description ............................................................................................................................. 4
3.1 Power supply .................................................................................................................................... 4
3.2 Measured parameters ...................................................................................................................... 4
3.3 Calculated parameters ..................................................................................................................... 5
3.4 Analog output signals ....................................................................................................................... 5
3.5 Service connector ............................................................................................................................. 6
3.6 Sensor protection (dust filter)............................................................................................................ 6
4 User configurable settings and functions ......................................................................................... 7
4.1 Function overview ............................................................................................................................. 7
4.2 Factory default settings .................................................................................................................... 9
5 Mechanical installation ..................................................................................................................... 10
5.1 General guidelines .......................................................................................................................... 10
5.2 Probe installation (HF73 type Q) .................................................................................................... 10
6 Electrical installation ........................................................................................................................ 11
6.1 General wiring guidelines ............................................................................................................... 11
6.2 Cable grip and cable specifications ................................................................................................ 12
6.3 Wiring and terminal block diagrams ................................................................................................ 12
7 Operation ........................................................................................................................................... 14
7.1 Minimum load requirements for the HF73 with voltage outputs ...................................................... 14
7.2 HF73 transmitters (analog outputs) ................................................................................................ 14
7.3 Service cable .................................................................................................................................. 15
7.4 Location of the service connector (mini USB type) ......................................................................... 16
7.5 Periodic calibration check ............................................................................................................... 17
7.6 Cleaning or replacing the dust filter ................................................................................................ 17
7.7 Validation of the output signals transmission .................................................................................. 17
8 Firmware updates .............................................................................................................................. 18
9 Technical data ................................................................................................................................... 19
9.1 Specifications ................................................................................................................................. 19
9.2 Dew point accuracy ........................................................................................................................ 21
10 Accessories ....................................................................................................................................... 22
11 Supporting documents ..................................................................................................................... 22
12 Document releases ........................................................................................................................... 22
Page 3
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
3 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
Applicability:
This manual applies to all instruments of the HF7 series with firmware version 3.2-1 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 HF7 transmitter series are designed for fixed installation in industrial applications. The HF7 measures
relative humidity and temperature and can be configured to calculate the dew or frost point. Depending on the
model, the HF7 can measure environments within the range of 0 to 100 %RH and -100 to 150C (-148 to 302F).
The electronics operating range is limited to -40…85 °C (-40…185 °F).
• HF732A: 3-wire (current signal or voltage signal).
This circuit type 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.
The HF7 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 HF7 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 HF7 series
can be kept up to date regarding any future functionality improvement.
Page 4
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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2 Mechanical configurations and dimensions
Type Q: Duct Mount (15 / 25 mm)
3 General description
3.1 Power supply
Depending on the circuit type, the HF7 requires the following power supply:
HF732A (3-wire with analog outputs): 15 to 40 VDC (see note below) or 13 to 28 VAC. With both output circuits
closed, the maximum current consumption is 100 mA for DC powered devices and 250 mA for AC powered
devices.
Note: depending on the type of output signal, the HF73 will operate with the following minimum voltage
0…1 V outputs: 6 VDC or 5 VAC
0…2 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 load
18 VDC or 13 VAC with 500 load
3.2 Measured parameters
The HF7 measures relative humidity with a ROTRONIC Hygromer® HT-1 capacitive sensor and temperature
with a Pt100 RTD.
Page 5
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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3.3 Calculated parameters
Using the ROTRONIC HW4 software, the HF7 can be configured by the user to calculate either the dew point
or the frost point.
3.4 Analog output signals
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 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:
Signal type
Maximum offset at range bottom
0…1 V
10 mV
0…2 V
20 mV
0…5 V
50 mV
0…10 V
100 mV
0…20 mA
0.2 mA
4…20 mA
No offset
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…2V, 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
HF732A transmitter. These requirements are defined in the “Operation” chapter.
Page 6
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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© 2015; Rotronic AG E-M-HF7-V1_27
3.5 Service connector
The service connector is a UART digital interface (Universal Asynchronous Receiver Transmitter) with a miniUSB type connector. This allows connecting the HF7 either to a PC running the ROTRONIC HW4 software or
to a probe input of another instrument that is compatible with the HygroClipAdvanced 2 (HC2A) probes. In both
cases a service cable is required. See “Maintenance” for the location of the service connector and for the type
of service cable to be used.
• Connecting the HF7 to a PC is used to configure the HF7, gain access to the HF7 functions such as humidity
and temperature adjustment, read data from the HF7 on the PC and update the AirChip 3000 firmware.
• Connecting the HF7 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 HF7 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 HF7.
3.6 Sensor protection (dust filter)
A dust filter is required to protect the sensors against dust particles and high air velocity. The probe of the HF7
is equipped with a with a metal filter carrier SPA-SS. The filter insertion must be ordered separately. Filter SPASSS is suitable for most applications.
Page 7
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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7 of 22
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© 2015; Rotronic AG E-M-HF7-V1_27
4 User configurable settings and functions
The HF7 ships configured as specified on the customer order. The analog outputs can be used just as with any
conventional humidity and temperature transmitter and most users will never need to use the HF7 configurable
settings and functions.
Making use of the HF7 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 HF7 functions and also
indicated the factory default settings.
4.1 Function overview
MEASUREMENT ACCURACY AND RELIABILITY
AirChip 3000 Functions
Description
► Humidity / temperature adjustment
o 1-point or multi-point humidity calibration or adjustment
o 1-point or 2-point temperature calibration or adjustment
o Generate a time stamp for calibrations and adjustments
o Retain and view last adjustment date and adjustment
values
o Generate calibration and adjustment protocols
► Automatic humidity sensor test
and optional drift compensation
Tests the humidity sensor for drift caused by contaminants
and can be used to automatically apply a correction. The test
is automatically carried out at regular intervals 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 shown as Good, SQ-tuned (corrected for drift) or Bad
(defective)
► Data recording
The data recording function differs from a true data logging
function in the sense that the AirChip 3000 does not time
stamp the data. This 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 session
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
HW4 software, time stamped and viewed
Page 8
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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MEASUREMENT LOOP VALIDATION
AirChip 3000 Functions
Description
► Simulator mode
Used to make the HF7 generate fixed values for the
humidity, temperature and calculated parameter. Can be
configured, enabled or disabled
DEVICE SAFEGUARDS
AirChip 3000 Functions
Description
► Device write protection
Used to protect the HF7 with a password to prevent
unauthorized digital access by a digital user. Can be
configured, enabled or disabled
PROCESS PROTECTION / PROTECTION OF OTHER DEVICES
AirChip 3000 Functions
Description
► Limit humidity output to 100 %RH
Used to prevent the humidity signal from exceeding
100 %RH when condensation forms on the sensor. Can be
enabled or disabled
► Out-of-limit value alarm
Used to specify the normal range for humidity, temperature
and 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 seen on the optional display
► Bad sensor alarm
Built-in function. Cannot be disabled
A bad humidity or temperature sensor triggers a digital alarm
which can be also be seen on the optional display
► Fail safe mode
Used to specify a "safe" fixed value for humidity and for
temperature in the event of a sensor failure. Can be
configured, enabled or disabled
Page 9
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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4.2 Factory default settings
Configuration of the HF7 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 HF7 service
connector to a USB port of the PC (see Maintenance > Service Cable).
Configurable Settings
Factory default
Unit system (Metric or English)
As per ordering code
Analog signal type (4…20 mA)
As per ordering code
Psychrometric calculation
As per ordering code
Output 1 parameter, scale and unit
As per ordering code (%RH)
Output 2 parameter, scale and unit
Temperature, unit as per ordering
code
Functions
Factory default
Humidity / temperature adjustment
Device write protection
Disabled
Menu access from keypad
Enabled
Limit humidity output to 100 %RH
Enabled
Out-of-limit value digital / display alarm
Disabled
Data recording
Enabled (loop mode – 10 min.
interval)
Automatic humidity sensor test
Disabled
Humidity sensor drift compensation
Disabled
Fail safe mode
Disabled
Simulator mode
Disabled
• For a detailed description of all AirChip 3000 / HF7 main functions see document E-T-AC3000-DF-V1
• Instructions regarding the configuration of the HF7 and access to its functions are provided in the
following manuals:
E-M-HW4v3-Main
E-M-HW4v3-F2-007
E-M-HW4v3-DR-001
E-M-HW4v3-A2-001
• The factory default setting for dew / frost point calculation is frost point below freezing
Page 10
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
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5 Mechanical installation
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 temperature of the environment to be measured. Because 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 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) 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 Probe installation (HF73 type Q)
Type Q for 25mm: use parts AC1303-M (compression fitting) and AC1305 (flange) to
hold and seal the probe when mounted through a wall (see Accessories).
Type Q for 15mm: use parts AC1304-M (compression fitting) and AC1306 (flange) to
hold and seal the probe when mounted through a wall (see Accessories).
Page 11
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
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6 Electrical installation
6.1 General wiring 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 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
in common bundles or channels / conduits
• direct current from 60 V to 400 V
(unshielded)
• alternate current from 25V to 400 V
(unshielded)
in separated bundles or channels /
conduits, without minimum distance
• direct and alternate current > 400 V
(unshielded)
• Telephone lines
• lines leading into EX-rated areas
in separated bundles or channels /
conduits, without minimum distance
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.
Page 12
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
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6.2 Cable grip and cable specifications
The HF7 is supplied either with one M16 sealing cable. 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.
6.3 Wiring and terminal block diagrams
6.3.1 HF73: 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 HF7 transmitter. These
requirements are defined in the “Operation” chapter
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.
Page 13
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
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HygroFlex HF732A Humidity Temperature
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Terminal block diagram
Measuring humidity or temperature only
Operation of the HF73 does not require both current loops to be closed. When using the HF73 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 HF73 can be disabled.
6.3.2 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).
Terminals
Description
K1-1: OUT1
Relative humidity or dew point (+)
K1-2: OUT2
Temperature output (+)
K1-3: GND
Ground (tied with other GND)
K1-4: GND
Ground (tied with other GND)
K2-1: PWR
Power supply: 15…40 VDC (+)
or 12…28 VAC (Phase)
K2-2: GND
Power supply (-) or neutral
(tied with other GND)
Page 14
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
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7 Operation
7.1 Minimum load requirements for the HF73 with voltage outputs
The following requirements apply to any external device or circuit connected to the HF73 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 HF73 voltage output.
7.2 HF73 transmitters (analog outputs)
If so desired, use the HW4 software to configure the HF7. Complete the mechanical and electrical installation
and simply power up the HF7.
HF73 output signal
Input resistance RL
0…1V
>=1kOhm
0…2V
>=2kOhm
0…5V
>=5kOhm
0…10V
>=10kOhm
HF73 signal
VCC
R pull-up
RL
0…1V
3.3V
≥ 250 kOhm
1 kOhm
HF73 signal
VCC
R pull-up
RL
0…1V
5.0V
≥ 400 kOhm
1 kOhm
0…2V
5.0V
≥ 400 kOhm
2 kOhm
0…5V
5.0V
≥ 400 kOhm
5 kOhm
HF73 signal
VCC
R pull-up
RL
0…1V
10.0V
≥ 1 MOhm
1 kOhm
0…2V
10.0V
≥ 1 MOhm
2 kOhm
0…5V
10.0V
≥ 1 MOhm
5 kOhm
0…10V
10.0V
≥ 1 MOhm
10 kOhm
RL
GND
HF73
Voltage Output
R Pull-up
RL
GND
VCC
HF73
Voltage Output
Page 15
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
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HygroFlex HF732A Humidity Temperature
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Maintenance
7.3 Service cable
IMPORTANT:
• 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.
• Use service cable AC3006 with all 3-wire transmitters as well as with digital models. 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 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 HF7 to a probe input of the HP23 hand-held
calibrator. For service purposes, the HP23 offers essentially the same functionality as the HW4
software.
Page 16
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
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7.4 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 is located on the HF7 printed
circuit board and can be accessed after removing the
enclosure cover.
Service
Connector
(Mini USB)
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Rotronic AG
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7.5 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 HF7 should be verified every 6 to 12 months. Applications where the HF7
is exposed to significant pollution may require more frequent verifications.
Procedure for adjusting the HF7 with the ROTRONIC HW4 software:
• Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the service
connector of the HF7 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.
• Start HW4 on the PC and search for the HF7 (HW4 Main Menu Bar > Devices and Groups > Search
for USB Masters).
• After finding the HF7 with HW4, expand the device tree to see the HF7 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
7.6 Cleaning or replacing the dust filter
Depending on the conditions of measurement, the filter should be checked from time to time. Corroded,
discolored or clogged filters should be replaced.
The probe of the HF7 has a removable filter.
7.7 Validation of the output signals transmission
If so desired, transmission of the HF7 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 HF7 generates
fixed digital and analog signals as specified by the user. For instructions see document
E-M-HW4v3-F2-007
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Rotronic AG
Bassersdorf, Switzerland
Document code
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HygroFlex HF732A Humidity Temperature
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8 Firmware updates
Firmware updates will be available on the ROTRONIC website for downloading. Firmware files 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 HF7 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 HF7 (HW4 Main Menu Bar > Devices and Groups >
Search for USB Masters).
• After finding the HF7, expand the device tree to see the HF7 functions. Select Device Manager. In the
Device Manager menu bar select Tools > Firmware Update. For instructions see document
E-M-HW4v3-F2-007
Page 19
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
19 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
9 Technical data
9.1 Specifications
General
HF73
Device type
Humidity temperature transmitter with analog output signals
Circuit type
3-wire
Mechanical configuration types
Q
Power supply and connections
HF73
Supply voltage (VDD)
15…40 VDC or 12…28 VAC
Nominal current consumption
<50 mA
Electrical connections
Terminal block and M16 cable grip
Polarity protection
Protective diode on V+
Humidity measurement
HF73
Sensor
ROTRONIC Hygromer ® HT-1
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
HF73
Sensor
Pt100 RTD, IEC 751 1/3 class B
Measuring range limits
-100…150 °C / -148…302 °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
HF73
Psychrometric calculations
Dew or frost point (user configurable option)
Page 20
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
20 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
Start-up time and data refresh rate
HF73
Start-up time
1.9 s (typical)
Data refresh rate
1.7 s (typical)
Configurable analog outputs
HF73
Output 1
Can be made to correspond to any parameter
Factory default parameter
Relative humidity
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
Signal type
4…20 mA
0…20 mA
4… 20 mA
0… 1 V
0… 2 V
0… 5 V
0… 10 V
(user configurable)
Accuracy of analog output
±30 µA
±20 µA
±2 mV (0-1V)
±5 mV (0-10V)
User configurable scaling limits
-999.99 … +9999.99 engineering units
Maximum offset at bottom of
signal range
no offset
0…1V signal range : 10 mV
0… 2V signal range: : 20 mV
0…5 V signal range : 50 mV
0…10 V signal range : 100 mV
0…20 mA signal range : 0.2 mA
4…20 mA signal range : no offset
Short circuit tolerant
Yes Maximum external load
500 Ω
500 Ω (current output)
Minimum external load
0 Ω
1 kΩ (0…1 V output)
2 kΩ (0…2 V output)
5 kΩ (0…5 V output)
10 kΩ (0…10 V output)
0 Ω (current output)
Service connector
HF73
Interface type
UART (Universal Asynchronous Receiver Transmitter)
Maximum service cable length
5 m (16.4 ft)
General specifications
HF73
Probe material
PPS
Probe dust filter material
Depends on filter type
Housing material
Aluminum die cast
Housing protection grade
IP 65
Physical dimensions
See Type Q
Weight
Approx. 800 g (28.2 oz) + 140 g (4.9 oz) per probe extension unit
Page 21
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
21 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
Conformity with standards
HF73
CE / EMC immunity
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
Environmental limits
HF73
Operating limits at electronics
-40…185 °C, 0…100 %RH, non condensing – valid for survival only
Temperature limits at probe
-100…+150 °C (valid for type Q)
Maximum humidity at sensor
100 %RH up to 80 °C (176 °F)
75 %RH at 100 °C (212 °F)
45 %RH at 125 °C (260 °F)
15 %RH at 150 °C (302 °F)
Maximum air velocity at probe
40 m/s (7,870 ft /min) – depends on dust filter type
Critical environments
Humidity sensor: as per DV04-14.0803.02 – Critical chemicals
9.2 Dew point accuracy
The HF7 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.
Page 22
E-M-HF732A-V1_0
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF732A Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page
22 of 22
Document title
© 2015; Rotronic AG E-M-HF7-V1_27
10 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 & HF732A datasheet
11 Supporting documents
Document File Name
Contents
E-M-HC2-accessories
Accessories and parts for probes, indicators and transmitters
E-T-AC3000-DF-V1
AirChip 3000 Description and Main Functions
E-M-HW4v3-DIR
List of the HW4 manuals
E-M-HW4v3-Main
HW4 software version 3: General instructions and functions common to
all devices
E-M-HW4v3-F2-007
HW4 software version 3: HF7 transmitter
Device configuration and AirChip 3000 functions
E-M-HW4v3-A2-001
HW4 software version 3: Probe Adjustment function AirChip 3000
devices
E-M-HW4v3-DR-001
HW4 software version 3: Data Recording Function AirChip 3000
Devices
E-M-AC3000-CP
AirChip 3000 Communication Protocol Options
E-M-CalBasics
Temperature and humidity calibration basics
E-T-HumiDefs
Humidity Definitions
Instructions for using the ROTRONIC humidity standards
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.
12 Document releases
Doc. Release
Date
Notes
_00
März 01, 2021
Original release
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