ROTRONIC HF3 User Manual

E-M-HF3-V1_22

Rotronic AG Bassersdorf, Switzerland

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HygroFlex HF3 Transmitters and Thermohygrostats: User Guide

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HygroFlex HF3

Transmitters and thermo-hygrostats

User Guide

E-M-HF3-V1_22

Rotronic AG Bassersdorf, Switzerland

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HygroFlex HF3 Transmitters and Thermohygrostats: User Guide

Instruction Manual

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Table of contents

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

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

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

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

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

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

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

3.4 Analog output signals (HF32 and HF33) ............................................................................................ 6

3.5 Relay outputs (HF34) ......................................................................................................................... 6

3.6 Service connector ............................................................................................................................... 7

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

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 Type D – through wall mount ........................................................................................................... 10

5.3 Type W – surface mount .................................................................................................................. 10

5.4 Type R and S – surface mount ......................................................................................................... 11

6 Electrical installation ......................................................................................................................... 12

6.1 General guidelines ........................................................................................................................... 12

6.2 Cable grip and cable specifications .................................................................................................. 13

6.3 Wiring ............................................................................................................................................... 13

7 Operation ............................................................................................................................................ 18

7.1 Minimum load requirements for the HF33 with voltage outputs ........................................................ 18

7.2 HF34 thermo-hygrostat .................................................................................................................... 19

8 Maintenance ................................................................ ....................................................................... 21

8.1 Service cable .................................................................................................................................... 21

8.2 Location of the service connector (mini-USB type)........................................................................... 21

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

8.4 Cleaning or replacing the dust filter (type D and W) ......................................................................... 22

9 Firmware updates .............................................................................................................................. 22

10 Technical data .................................................................................................................................... 23

10.1 Specifications ................................................................................................................................... 23

10.2 Dew point accuracy .......................................................................................................................... 26

11 Accessories ........................................................................................................................................ 27

12 Supporting documents ...................................................................................................................... 27

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

E-M-HF3-V1_22

Rotronic AG Bassersdorf, Switzerland

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Applicability:

This manual applies to all instruments of the HF3 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 HF3 transmitters and thermo-hygrostats 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).

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 compensation 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.

HF3 thermo-hygrostats: the HF34 (3-wire circuit type) is available as a thermo-hygrostat (humidity and temperature), as a thermostat (temperature only) or as a hygrostat (humidity only).

E-M-HF3-V1_22

Rotronic AG Bassersdorf, Switzerland

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2 Mechanical configurations and dimensions

E-M-HF3-V1_22

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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 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-F2-002.

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

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 , 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 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 HF33 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

c) HF34 (3-wire): 8 to 40 VDC or 12 to 28 VAC. With both relays energized, the maximum current

consumption is 50 mA.

3.2 Measured parameters

The HF3 measures relative humidity with a ROTRONIC Hygromer® IN1 capacitive sensor and temperature with a Pt100 RTD.

E-M-HF3-V1_22

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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

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.

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 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 and exhibit a small

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

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

3.5 Relay outputs (HF34)

Each of the two independent SPDT relays has its own set-point which can be adjusted with a potentiometer located on the printed circuit board. A relay is energized when the value of the monitored parameter is higher than the corresponding set-point. Operation of each relay is indicated by a LED located on the HF34 printed circuit board. This LED is lit when the corresponding relay is energized.

Using the ROTRONIC HW4 software any of the two relays can be made to correspond to one of the following:

Relative humidity

Temperature

Dew or frost point If so desired, any relay can also be disabled. The minimum and maximum limits for the two adjustable set-

points (potentiometer) can be set within the numerical limits of -999.99 and 9999.99 and the dead band for each set-point can also be adjusted.

E-M-HF3-V1_22

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

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 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 location 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 connection allows showing the data measured by the HF3 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 HF3.

3.7 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.

4 User configurable settings and functions

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

E-M-HF3-V1_22

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MEASUREMENT ACCURACY AND RELIABILITY

► 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. 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 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

MEASUREMENT LOOP VALIDATION

AirChip 3000 Functions

Description

► Simulator mode

Used to 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 device 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

E-M-HF3-V1_22

Rotronic AG Bassersdorf, Switzerland

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Configurable Settings

Applicability

Factory default

Unit system (Metric or English)

HF32, HF33, HF34

As per ordering code

Analog signal type (4…20 mA or other)

HF33

As per ordering code

Psychrometric calculation

HF32, HF33, HF34

As per ordering code

Output 1 parameter, scale and unit

HF32, HF33

As per ordering code (%RH or DP)

Output 2 parameter, scale and unit

HF32, HF33

Temperature, unit as per ordering code

Relay 1 set-point potentiometer adjust. span

HF34

As per order (%RH or DP)

Relay 2 set-point potentiometer adjust. span

HF34

As per order (temperature)

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, HF34

Instrument model

Functions

Applicability

Factory default

Humidity / temperature adjustment

HF32, HF33, HF34

Device write protection

HF32, HF33, HF34

Disabled

Limit humidity output to 100 %RH

HF32, HF33

Enabled

Out-of-limit value digital / display alarm

HF32-S, HF33-S

Disabled

Data recording

HF32, HF33, HF34

Enabled (loop mode – 10 min. interval)

Automatic humidity sensor test

HF32, HF33, HF34

Disabled

Humidity sensor drift compensation

HF32, HF33, HF34

Disabled

Fail safe mode

HF32, HF33, HF34

Disabled

Simulator mode

HF32, HF33

Disabled

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).

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

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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) 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").

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5.4 Type R and S – surface mount

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

E-M-HF3-V1_22

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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 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:

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Lightning protection

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

6.2 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.

E-M-HF3-V1_22

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Terminals

Description

T-OUT

Temperature output (+) OUT-2

V+

Power supply: 10…28 VDC (+)

H-OUT

Relative humidity or dew point (+) OUT-1

V+

Power supply: 10…28 VDC (+)

Terminals

Description

1

Power supply: 10…28 VDC (+)

2

Temperature output (+) OUT-2

3

Power supply: 10…28 VDC (+)

4

Relative humidity or dew point (+) OUT-1

5

Not used

6

Not used

Terminal block diagram for type D and W

Terminal block diagram for type R and S

Note: connect the + of the power supply to only one of the V+ terminals. The two terminals marked V+ 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 from the factory to measure either humidity 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.

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

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Terminals

Description

V+

Power supply: 15…40 VDC (+) or 12…28 VAC (Phase)

GND

Power supply (-) or neutral

OUT1

Relative humidity or dew point (+) OUT-1

OUT2

Temperature output (+) OUT-2

GND

Ground (tied with other GND)

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” 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.

Terminal block diagram for type D and W

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Terminals

Description

1

Power supply: 15…40 VDC (+) or 12…28 VAC (Phase)

2

Power supply (-) or neutral / ground

3

Relative humidity or dew point (+) OUT-1

4

Temperature output (+) OUT-2

5

Not used

6

Not used

Terminal block diagram for type R and S

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 HF34: thermo-hygrostat

Electrical diagram

NC: normally closed contact (relay not energized)

NO: normally open contact (relay not energized)

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Terminals

Description

K1-1

Power supply: 15…40 VDC (+) or 12…28 VAC (Phase)

K1-2

Power supply (-) or neutral / ground

K2-1

Relay 1: humidity. Normally closed

K2-2

Relay 1: humidity. Common

K2-3

Relay 1: humidity. Normally open

K3-1

Relay 2: temperature. Normally closed

K3-2

Relay 2: temperature. Common

K3-3

Relay 2: relative temperature. Normally open

Terminal block diagram for type D and W

L1 : LED for relay 1 (lit when relay is energized) L2 : LED for relay 2 (lit when relay is energized) P1 : Set point adjustment potentiometer for relay 1 P2 : Set point adjustment potentiometer for relay 2

Note: the parameter (relative humidity, temperature, dew or frost point) corresponding to each relay can be changed with the HW4 software.

6.3.4 Grounding (HF32, HF33 and HF34)

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

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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

7 Operation

7.1 Minimum load requirements for the HF33 with voltage outputs

The following requirements apply to any external device 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.

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Relay is energized above the set-point: Common and Normally Open contacts are connected (use for Dryer)

Relay is not energized below the set-point: Common and Normally Closed contacts are connected (use for Humidifier)

Set Point

Dead Band

%RH or dew point

Relay is energized above the set-point: Common and Normally Open contacts are connected (use for cooling element)

Relay is not energized below the set-point: Common and Normally Closed contacts are connected (use for heating element)

Set Point

Dead Band

Temperature

7.2 HF34 thermo-hygrostat

7.2.1 Relay operating diagram

Relay 1

Relay 2

7.2.2 Set point adjustment procedure

Two different procedures can be used to adjust each set point. Both require connecting the HF34 to a PC with the ROTRONIC HW4 software running.

Note:

Adjustment of the set point is by means of a surface mount potentiometer. The scale corresponding to the minimum and maximum positions of the potentiometer can be changed with the ROTRONIC HW4 software. Precise adjustment of the set point with the potentiometer is made easier when using a narrow scale. Using the example of 50.0 %RH for the set point, it is much easier to precisely adjust the potentiometer at 50.0 %RH with a scale of 49 to 51 %RH than it is with a scale of 0 to 100 %RH. It should be noted that a scale of 49 to 51 %RH does limit any future set point adjustment in the field to only ± 1.0 %RH.

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Procedure 1:

1) Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the HF34

service connector 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

2) Start HW4 and search for the HF34 (HW4 Main Menu Bar > Devices and Groups > Search for USB

Masters).

3) Use the HF34 Device Manager to enable the HF34 simulator function (see HW4 manual

E-M-HW4v3-F2-002). Set the fixed humidity and temperature signals to the desired value for both the humidity and temperature set points.

4) Slowly turn each set-point potentiometer up or down so as to find the position where the

corresponding LED switches on and off (see 7.3.3). This position of the potentiometer corresponds to the desired set-point value.

5) Disable the HF34 simulator function

6) Disconnect the HF34 from the PC

Note: when the set-point is a dew or frost point value, proceed as follows prior to using the above procedure:

1) In the HW4 Main Menu bar, select View > Psychrometric Conversions.

2) Under Input Parameter, select dew or frost point.

3) Enter the value of the dew or frost point and a temperature value such as 25°C

4) Calculate the relative humidity corresponding to the dew or frost point.

5) Write down the relative humidity value. The temperature value of 25°C and the calculated relative

humidity value will be used when setting the HF34 simulated values.

Procedure 2:

1) Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the HF34

service connector 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

2) Start HW4 and search for the HF34 (HW4 Main Menu Bar > Devices and Groups > Search for USB

Masters).

3) Open the HF34 Device Manager. In Device Manager, the relays tab shows the current value of each

set point (see HW4 manual E-M-HW4v3-F2-002).

4) Turn each set-point potentiometer up or down in small increments (see 7.3.3). Refresh the Relays

form in Device Manager to show the new value of each set point. Repeat this operation until each set point has the desired value.

5) Disconnect the HF34 from the PC

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Service connector

HF33

HF34

HF32

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 the HF34 thermo-hygrostat.

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.

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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 alignment by holding the sensor 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 analog signals 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 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 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

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General

HF32

HF33

HF34

Device type

Humidity temperature transmitter

Thermo-hygrostat

Circuit type

2-wire, loop powered

3-wire

Mechanical configuration types

D, R, S and W

D and W

Power supply and connections

HF32

HF33

HF34

Supply voltage (VDD)

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

15…40 VDC or 12…28 VAC

8…40 VDC or

12…28 VAC Nominal current consumption

2 x 20 mA

< 50 mA

Electrical connections

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

Type D and W: terminal block and M16 cable grip

Polarity protection

Protective diode on V+

Humidity measurement

HF32

HF33

HF34

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)

±2.0 %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

HF32

HF33

HF34

Sensor

Pt100 RTD, IEC 751 1/3 class B

Measuring range

-40…60 °C / -40…140 °F

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

HF34

Psychrometric calculations

Dew or frost point (user configurable option)

Start-up time and data refresh rate

HF32

HF33

HF34

Start-up time

3.4s (typical)

1.9s (typical)

Data refresh rate

3.4s (typical)

1.7s (typical)

10 Technical data

10.1 Specifications

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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

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)

Configurable relay outputs

HF34

Relay 1

Can be made to correspond to any parameter

Factory default parameter

Relative humidity or dew / frost point

Factory default set-point scale

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

Relay 2

Can be made to correspond to any parameter

Factory default parameter

Temperature

Factory default set-point scale

0…50 °C or 0… 100 °F

Relay 1 and Relay 2

Set point adjustment

Surface mount potentiometer

User configurable set-point limits

Potentiometer minimum and maximum: 0…100 for humidity

-100…200 for temperature or the dew / frost point

Energized relay indication

LED Relay type

SPDT (single pole double throw)

Maximum switching voltage

250 VAC 1)

Maximum switching current

6 A (AC) 1)

1) Resistive load

Digital interface (service connector)

HF32

HF33

HF34

Interface type

UART (Universal Asynchronous Receiver Transmitter)

Maximum service cable length

5 m (16.4 ft)

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General specifications

HF32

HF33

HF34

Optional display (S and R configurations only)

LC, 1 or 2 decimals resolution, no backlight, trend indication

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

Probe material

Polycarbonate, except type R and S

Polycarbonate

Probe dust filter material

Polyethylene, except type R and S

Polyethylene

Housing material

ABS

Housing protection grade

IP 65, except type R and S

IP 65

Physical dimensions

See Models

Weight

90 g (3.1 oz)

105 g (3.7 oz)

Conformity with standards

HF32

HF33

HF34

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

HF32

HF33

HF34

Storage and transit

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

Operating limits at electronics

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

Temperature limits at probe

-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

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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.

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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-F2-002

HW4 software version 3: HF3 transmitters and hygrostats 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

E-M-CalBasics

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

E-T-HumiDefs

Humidity Definitions

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

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 HF3 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual