ROTRONIC HF7 User Manual

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

1 of 23

Document title

HygroFlex HF7

Humidity Temperature Transmitters

User Guide

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

2 of 23

Document title

Table of contents

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

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

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

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

3.2 Measured parameters ...................................................................................................................... 5

3.3 Calculated parameters ..................................................................................................................... 5

3.4 Analog output signals ....................................................................................................................... 5

3.5 Display option ................................................................................................................................... 6

3.6 Service connector ............................................................................................................................. 6

3.7 Sensor protection (dust filter)............................................................................................................ 7

4 User configurable settings and functions ......................................................................................... 7

4.1 Function overview ............................................................................................................................. 7

4.2 Factory default settings .................................................................................................................... 8

5 Mechanical installation ....................................................................................................................... 9

5.1 General guidelines ............................................................................................................................ 9

5.2 Enclosure installation (HF7 type N and W) ..................................................................................... 10

5.3 Probe installation (HF7 type N, D and A) ........................................................................................ 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 ........................................................................................................................................... 16

7.1 Minimum load requirements for the HF73 with voltage outputs ...................................................... 16

7.2 HF72 and HF73 transmitters (analog outputs)................................................................................ 16

8 Maintenance....................................................................................................................................... 17

8.1 Service cable .................................................................................................................................. 17

8.2 Location of the service connector (mini USB type) ......................................................................... 17

8.3 Periodic calibration check ............................................................................................................... 18

8.4 Cleaning or replacing the dust filter ................................................................................................ 18

8.5 Validation of the output signals transmission .................................................................................. 18

9 Firmware updates .............................................................................................................................. 19

10 Technical data ................................................................................................................................... 20

10.1 Specifications ................................................................................................................................. 20

10.2 Dew point accuracy ........................................................................................................................ 22

11 Accessories ....................................................................................................................................... 23

12 Supporting documents ..................................................................................................................... 23

13 Document releases ........................................................................................................................... 23

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

3 of 23

Document title

Applicability:

This manual applies to all instruments of the HF7 series with firmware version 1.x, where 1.x can be 1.0, 1.1, etc. 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 150 C (-148 to 302 F). The electronics operating range is limited to -50…100 °C (-58…212 °F)

Two types of electronic circuit are available:

HF72: 2-wire, loop powered (4…20 mA current signal) HF73: 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.

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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

4 of 23

Document title

2 Mechanical configurations and dimensions

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

5 of 23

Document title

3 General description

3.1 Power supply

Depending on the circuit type, the HF7 requires the following power supply: a) HF72 (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 , 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) HF73 (3-wire with analog outputs): 15 to 40 VDC (see note below) or 12 to 28 VAC. With both output

circuits closed, the maximum current consumption is 50 mA. Note: depending on the type of output signal, the HF73 will operate with the following minimum voltage

0…1 V outputs: 5 VDC or 5 VAC 0…5 V outputs: 10 VDC or 8 VAC 0…10 V outputs: 15 VDC or 12 VAC 0…20 mA or 4 …20 mA outputs: 6 VDC or 5 VAC with 0 load

15 VDC or 12 VAC with 500 load

3.2 Measured parameters

The HF7 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 HF7 can be configured by the user to calculate either the dew point or the frost point.

3.4 Analog output signals

HF72 and HF73

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:.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

6 of 23

Document title

Signal type

Maximum offset at range bottom

0…1 V

3 mV

0…5 V

50 mV

0…10 V

90 mV

0…20 mA

4 µA

4…20 mA

No offset

HF73

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

HF73 transmitter. These requirements are defined in the “Operation” chapter

3.5 Display option

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 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-F2-007.

The display option for the HF73 has a backlight. The display option for the HF72 does not have a backlight

3.6 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 HygroClip 2 (HC2) 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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

7 of 23

Document title

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

3.7 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 base mod. NSP-ME. The filter cartridge must be ordered separately (see Accessories 11.5). Filter cartridge mod. SP-M15 is suitable for most applications.

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

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

8 of 23

Document title

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

Configurable Settings

Applicability

Factory default

Unit system (Metric or English)

HF72, HF73

As per ordering code

Analog signal type (4…20 mA or other)

HF73

As per ordering code

Psychrometric calculation

HF72, HF73

As per ordering code

Output 1 parameter, scale and unit

HF72, HF73

As per ordering code (%RH or DP)

Output 2 parameter, scale and unit

HF72, HF73

Temperature, unit as per ordering code

Functions

Applicability

Factory default

4.2 Factory default settings

Notes:

o 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).

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

9 of 23

Document title

Humidity / temperature adjustment

HF72, HF73

Device write protection

HF72, HF73

Disabled

Menu access from keypad

HF72, HF73

Enabled

Limit humidity output to 100 %RH

HF72, HF73

Enabled

Out-of-limit value digital / display alarm

HF72, HF73

Disabled

Data recording

HF72, HF73

Enabled (loop mode – 10 min. interval)

Automatic humidity sensor test

HF72, HF73

Disabled

Humidity sensor drift compensation

HF72, HF73

Disabled

Fail safe mode

HF72, HF73

Disabled

Simulator mode

HF72, HF73

Disabled

o For a detailed description of all AirChip 3000 / HF7 main functions see document E-T-AC3000-DF-V1 o 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

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

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) Immerse as much of the probe as possible in the environment to be measured.

HF7 type N with 120 mm probe length: to avoid measurement errors caused by temperature gradients fully immerse the probe barrel in the environment to be measured

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

10 of 23

Document title

Mounting Hole

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 Enclosure installation (HF7 type N and W)

The HF7 enclosure consists of a base and a cover held together with 4 screws. Remove the cover to gain access to the 4 holes that are provided to attach the enclosure to a mounting surface.

5.3 Probe installation (HF7 type N, D and A)

Type N and D: use parts AC1303-M (compression fitting) and AC1305 (flange) to hold

and seal the probe when mounted through a wall (see Accessories). Type A: use parts AC1304-M (compression fitting) and AC1306 (flange) to hold and

seal the probe when mounted through a wall (see Accessories).

o The enclosure of the HF7 type D and A does not require any additional support.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

11 of 23

Document title

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

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:

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

12 of 23

Document title

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

The HF7 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.

6.3 Wiring and terminal block diagrams

6.3.1 HF72: 2-wire, loop powered transmitter

Electrical diagram

The maximum permissible cable length connecting the HF72 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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

13 of 23

Document title

Terminals

Description

K1-1: H+V

Power supply: 10…28 VDC (+)

K1-2: H-OUT

Relative humidity or dew point (+) OUT-1

K1-3: T+V

Power supply: 10…28 VDC (+)

K1-4: T-OUT

Temperature output (+) OUT-2

Terminal block diagram

Note: connect the + of the power supply to only one of the V+ terminals. The two terminals marked H+V and

T+V are internally connected.

Measuring humidity or temperature only

Unless configured to measure either humidity only or temperature only, proper operation of the HF72 requires both current loops to be closed. The HF72 can be directly ordered from the factory to measure either humidity or temperature only. When necessary, any unused output of the HF72 can be disabled with the ROTRONIC HW4 software. When the HF72 is configured with one of the two outputs disabled, close only the loop that is being used.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

14 of 23

Document title

6.3.2 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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

15 of 23

Document title

Terminals

Description

K1-1: OUT1

Relative humidity or dew point (+)

K1-2: OUT2

Temperature output (+)

K1-3: 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)

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.

6.3.3 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).

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

16 of 23

Document title

HF73 output signal

Input resistance RL

0…1V

>=1kOhm

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…5V

5.0V

≥ 400 kOhm

5 kOhm

HF73 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

HF73

Voltage Output

R Pull-up

RL

GND

VCC

HF73

Voltage Output

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 HF72 and 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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

17 of 23

Document title

Service Connector (Mini USB)

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 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.

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 is located on the HF7 printed circuit board and can be accessed after removing the enclosure cover.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

18 of 23

Document title

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 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:

o 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.

o Start HW4 on the PC and search for the HF7 (HW4 Main Menu Bar > Devices and Groups > Search

for USB Masters).

o 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

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

8.4 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 cartridge. Simply replace the cartridge (leave the metal base on the probe).

8.5 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

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

19 of 23

Document title

9 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

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

20 of 23

Document title

General

HF72

HF73

Device type

Humidity temperature transmitter with analog output signals

Circuit type

2-wire, loop powered

3-wire

Mechanical configuration types

N, D, A and W

Power supply and connections

HF72

HF73

Supply voltage (VDD)

10…28VDC V min = 10 V + (0.02 x Load*) *Load resistance in ohms.

15…40 VDC or 12…28 VAC

Nominal current consumption

2 x 20 mA

< 50 mA

Electrical connections

Terminal block and M16 cable grip or ½” conduit adapter

Polarity protection

Protective diode on V+

Humidity measurement

HF72

HF73

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

HF72

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

HF72

HF73

Psychrometric calculations

Dew or frost point (user configurable option)

10 Technical data

10.1 Specifications

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

21 of 23

Document title

Start-up time and data refresh rate

HF72

HF73

Start-up time

3.4s (typical)

1.9s (typical)

Data refresh rate

3.4s (typical)

1.7s (typical)

Configurable analog outputs

HF72

HF73

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

Signal type

4…20 mA

0…20 mA 4… 20 mA 0… 1 V 0… 5 V 0… 10 V

(user configurable)

User configurable scaling limits

-999.99 … +9999.99 engineering units

Maximum offset at bottom of signal range

no offset

0…1V signal range : 3 mV 0…5 V signal range : 50mV 0…10 V signal range : 90mV 0…20 mA signal range : 4uA 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) 5 kΩ (0…5 V output) 10 kΩ (0…10 V output) 0 Ω (current output)

Service connector

HF72

HF73

Interface type

UART (Universal Asynchronous Receiver Transmitter)

Maximum service cable length

5 m (16.4 ft)

General specifications

HF72

HF73

Probe material

Stainless steel V2A / 1.4305 / AISI 302

Probe dust filter material

Depends on filter type

Housing material

Aluminum die cast

Housing protection grade

IP 65

Physical dimensions

See Models

Weight

Approx. 800 g (28.2 oz) + 140 g (4.9 oz) per probe extension unit

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

22 of 23

Document title

Conformity with standards

HF72

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

HF72

HF73

Operating limits at electronics

-50 … +85 °C, 0…100 %RH, non condensing – valid for survival only

Temperature limits at probe

-100…+150 °C (valid for type N, D and A)

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

10.2 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.

E-M-HF7-V1_24

Rotronic AG Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF7 Humidity Temperature Transmitters: User Guide

Instruction Manual

Document Type

Page

23 of 23

Document title

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

Doc. Release

Date

Notes

_20

Apr.11, 2009

Original release

_21

Nov. 6, 2009

Changed maximum operating temperature at electronics from 100°C to 85°C

_22

Mar. 2, 2010

Added the LC display option

_23

Jun. 20, 2010

Updated document for HW4 v.3

_24

Oct. 28, 2011

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

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

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.

13 Document releases

ROTRONIC HF7 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual