HygroClip 2 (HC2) Humidity Temperature Probes User Guide

E-M-HC2 Probes-V1_26

Document code

HygroClip 2 (HC2) Humidity Temperature

Probes: User Guide

Rotronic AG

Bassersdorf, Switzerland

Unit

Instruction Manual

Document Type

Page 1 of 31

Document title

HygroClip 2 (HC2) Humidity Temperature Probes

User Guide

© 2009-2013; Rotronic AG E-M-HC2 Probes-V1_26


Document code



Rotronic AG


Unit


Document Type

Page 2 of 31

Document title

Table of contents

1

2

3

1.1

3.1

3.2

3.3

4

4.1

4.2

5

3.4

3.5

3.6

3.7

5.1

6

6.1

Models .................................................................................................................................................... 4

General description ............................................................................................................................. 12

Power supply...................................................................................................................................... 12

Measured parameters ........................................................................................................................ 12

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

Hardware and software compatibility ................................................................................................... 3

Calculated parameters ....................................................................................................................... 12

Analog output signals ......................................................................................................................... 12

Digital interface .................................................................................................................................. 13

Connector .......................................................................................................................................... 14

Sensor protection (dust filter) ............................................................................................................. 14

User configurable settings and functions ......................................................................................... 15

7

7.1

7.2

7.3

6.2

6.3

6.4

6.5

7.4

7.5

8

Function overview .............................................................................................................................. 15

Factory default settings ...................................................................................................................... 16

Mechanical installation ....................................................................................................................... 18

General guidelines for fixed installation .............................................................................................. 18

Electrical installation ........................................................................................................................... 19

General guidelines for fixed installation .............................................................................................. 19

Analog signal wiring ........................................................................................................................... 20

Minimum analog output load .............................................................................................................. 20

Digital signal wiring ............................................................................................................................ 20

Grounding .......................................................................................................................................... 20

Operation .............................................................................................................................................. 20

Operation with an indicator, data logger or transmitter ....................................................................... 20

Stand-alone operation as an analog probe ........................................................................................ 20

Stand-alone operation as a digital probe (PC or network) .................................................................. 22

8.1

8.2

8.3

9

10

10.1

10.2

10.3

11

12

Connectivity examples for stand-alone probes .................................................................................. 22

Hand-held probes used with an indicator ........................................................................................... 23

Maintenance ......................................................................................................................................... 24

Cleaning or replacing the dust filter .................................................................................................... 24

13

Periodic calibration check .................................................................................................................. 24

Validation of the output signals transmission ..................................................................................... 24

Firmware updates ................................................................................................................................ 25

Technical data ...................................................................................................................................... 26

Specifications ..................................................................................................................................... 26

Dew point accuracy ............................................................................................................................ 28

Effect of cable temperature on the accuracy of probes HC2-C04 and HC2-C05 ............................... 29

Accessories and parts ........................................................................................................................ 29

Supporting documents ....................................................................................................................... 29

Document releases .............................................................................................................................. 30



Document code



Rotronic AG


Unit


Document Type

Page 3 of 31

Document title

Applicability:

This manual applies to all HC2 probes with firmware version 3.0 or higher. Changes to the last digit of the version number reflect minor firmware changes that do not affect the manner in which the probe should be operated.

1 Overview

The HC2 series are digital humidity-temperature probes based on the AirChip 3000 technology. These probes feature a UART serial interface and two 0…1 V linear analog output signals.

The HC2 probes are designed for use with the HygroClip 2 generation of ROTRONIC humidity-temperature instruments: hand-held and bench top indicators, data loggers, transmitters, hygrostats, etc. The HC2 probes maintain all of the benefits of the original HygroClip technology such as the possibility of hot-swapping probes and feature significant improvements in the area of measurement accuracy and functionality.

The HC2 probes can also be used as a stand-alone device using either the analog output signals or the probe digital interface. Connectors, cables and digital interface adapters are available to this purpose. Digital integration with OEM applications is facilitated by the probe communication protocol options.

The HC2 probes offer the following user functions: configurable

 Calculation of the dew or frost point

 Humidity temperature calibration and adjustment

 Simulator

 Automatic humidity sensor test and drift compensation

 Sensor recording

The ability for the user to easily update the AirChip 3000 firmware means that the HC2 probes can be kept upto-date regarding any future functionality improvement.

Available in different configurations, the HC2 probe series is designed to meet the requirements of a large number of applications and environments.

1.1 Hardware and software compatibility

The HC2 probes are compatible only with the AirChip 3000 generation of ROTRONIC humidity-temperature instruments and are not backward compatible with instruments based on the previous technology.

Configuration of the HC2 probes and access to the probe functions requires a PC with the ROTRONIC HW4 software version 2.1.0 or higher or connection to a compatible instrument from ROTRONIC. For firmware updates HW4 software version 3.3.0 or higher is needed.



Document code



Rotronic AG


Unit


Document Type

Page 4 of 31

Document title

2 Models

In the following tables, we have indicated the type of instrument primarily used with each probe model. The following should also be noted:

 The HC2 probes can be directly connected to a PC or to an Ethernet network using one of the available digital interface adapters (see separate document E-M-HC2-accessories).

 The HC2 Probes can also be used as a stand alone device with two analog output signals. Different connectors are available to this purpose (see separate document E-M-HC2-accessories).

Regardless of the probe model, the analog outputs signals are always scaled in the same way by the factory

(0…1 V = 0…100 %RH and 0…1 V = -40…60 °C). The user is responsible for reconfiguring the probe analog outputs (requires the ROTRONIC HW4 software) and for providing power to the probe.

Climate measurement

For use with indicators, data loggers and transmitters, with or without an extension cable

HC2-S

Humidity measuring range: 0…100 %RH

Temperature limits -50…100 °C (-58…212 °F)

Diameter: 15mm (0.6”), length: 85 mm (3.3”)

Housing and filter cap: polycarbonate, black

Standard dust filter: NSP-PCB-PE (Polyethylene)

Accurate measurements require full immersion in the environment to be measured

Weight: approx. 10 g (0.35 oz)

HC2-S3 Same as HC2-S but with white housing and filter cap for outdoor use



Document code



Rotronic AG


Unit


Document Type

Page 5 of 31

Document title

Climate measurement

For use with indicators, data loggers and transmitters, with or without an extension cable

HC2-SM



Diameter: 15mm (0.6”), length: 107 mm (4.3”)

Housing and filter cap: stainless steel 1.4301

Standard dust filter: SP-M15 (wire mesh, DIN1.4401)

Accurate measurements require full immersion in the environment to be measured




Document code



Rotronic AG


Unit


Document Type

Page 6 of 31

Document title

Measurement in tight spaces

For use with indicators, data loggers and transmitters

HC2-C04



Diameter: 4 mm (0.16”), cable length (electronics – probe tip: about 0.59 m (1.9 ft)

Probe electronics housing: polycarbonate, black


HC2-C05

Same as HC2-C05 but with 5 mm diameter (0.2”)

Can be equipped with Teflon dust filter SP-T05


Note: accuracy of the HC2-C04 and HC2-C05 probe models is affected by the temperature of the cable separating the sensors from the electronics (see §10.3).

Spot check measurements in air ducts, chambers and ovens

Handheld probe for use with indicators and data loggers

HC2-HK25

HC2-HK40


Temperature limits at sensor -100…150 °C (-148…302 °F)

Barrel: diameter: 15 mm (0.6”), length: 250 mm (9.8”)

Probe cable length: 2 m (6.5 ft)

Handgrip: POM, black -, barrel: PEEK, black

Filter base (NSP-ME) with wire mesh filter cartridge (SP-M15)




Same as HC2-HK25 but with barrel 400 mm barrel length (15.7”)




Document code



Rotronic AG


Unit


Document Type

Page 7 of 31

Document title

Measurement of dust-free granular products in bulk


HC2-P05





Handgrip: POM, black - barrel: stainless steel DIN 1.4305


Measurement of seeds, granulates and powders in bulk


HC2-HP28

HC2-HP50





Handgrip: POM, black - barrel: stainless steel DIN1.4301

Dust filter: sintered steel filter cartridge (ET-Z10)



Same as HC2-HP28 but with barrel 500 mm barrel length (19.7”)




Document code



Rotronic AG


Unit


Document Type

Page 8 of 31

Document title

Measurement of paper – cardboard stacks and rolls


HC2-HS28

HC2-HS42



Blade: thickness: 4 mm (0.16”), width: 22 mm (0.87”), length: 280 mm (11.0”)



Handgrip: POM, black - blade: aluminum / elox

Same as HC2-HS28 but with 420 mm blade length (16.5”)


Measurement of product samples (liquids, pastes, powders, granules or chunks)


HC2-AW



Barrel: aluminum (top) , stainless steel (bottom)

Probe cable length: 0.95 m (37.5”)

Weight: approx. 541 g (1 lb 3.1 oz)

Use together with WP14 or

WP-40 sample cup holder

Prior to use, verify the integrity and cleanliness of the sealing

O-ring located under the probe

Power Indicator (red LED)

Power ON/OFF (push button)

Note:

When using the HC2-AW probe, check that the red LED on top of the probe is lit. This indicates that the probe is being powered. If necessary, power the probe by pressing once on the red button located on top of the probe.

When the red LED is not lit, the probe is not powered and the instrument is not receiving a signal from the probe.



Document code



Rotronic AG


Unit


Document Type

Page 9 of 31

Document title

Process measurement (fixed installation)

For use with transmitters and data loggers

HC2-IC102

HC2-IC105

HC2-IC302

HC2-IC305



Barrel: diameter: 15 mm (0.6”), length: 100 mm (3.9”). See note below

Probe cable length.: 2 m (6.5 ft) or 5 m (16.4 ft)

Barrel: PEEK

Filter base (NSP-ME). Filter cartridge to be ordered separately

Weight: with 2 m cable approx. 230 g (8.1 oz), + 80 g (2.8 oz) per additional meter

Same as HC2-IC1xx but with 250 mm barrel length(9.8”) for through wall installation

Weight: with 2 m cable approx. 260 g (9.2 oz), + 80 g (2.8 oz) per additional meter

Note: HC2-IC1 (100 mm barrel length) – to avoid measurement errors due to temperature gradients fully immerse the probe barrel in the environment to be measured



HC2-IC302-A

HC2-IC305-A



Barrel: diameter: 25 / 15 mm (1.0 / 0.6”), length: 250 mm (9.8”)


Barrel: PEEK, black

Filter base (NSP-ME). Filter cartridge to be ordered separately

Designed for through wall installation

Weight with 2 m cable: approx. 290 g (10.2 oz), + 80 g (2.8 oz) per additional meter

HC2-IC402-A

HC2-IC405-A

HC2-IC502-A

HC2-IC505-A

HC2-IC702-A

HC2-IC705-A

Same as HC2-IC3xx-A but with 400 mm barrel length(15.7”)


Same as HC2- IC3xx-A but with 550 mm barrel length(21.6”)


Same as HC2- IC3xx-A but with 700 mm barrel length(27.5”)




Document code



Rotronic AG


Unit


Document Type

Page 10 of 31

Document title



HC2-IM102

HC2-IM105





Barrel: stainless steel

Filter base (SP-MSB15). Filter cartridge to be ordered separately


HC2-IM302

HC2-IM305

HC2-IM402

HC2-IM405

HC2-IM502

HC2-IM505

Same as HC2-IM1xx but with 280 mm barrel length(11.0”) for through wall installation






HC2-IM102-M

HC2-IM105-M

HC2-IM302-M

HC2-IM305-M

HC2-IM402-M

HC2-IM405-M

HC2-IM502-M

HC2-IM505-M














Note 1:

HC2-IMxxx-M probes are the same as HC2-IMxxx but are equipped with a stainless steel connector instead of

PPS.

Note 2:

HC2-IM1 (120 mm barrel length) - to avoid measurement errors due to temperature gradients fully immerse the probe barrel in the environment to be measured.



Document code



Rotronic AG


Unit


Document Type

Document title

Measurement in compressed air conduits and vessels (fixed installation)

Page 11 of 31


HC2-IE102

HC2-IE105



G ½” thread for maximum 100 bar / 1450 PSI





HC2-IE302

HC2-IE305

HC2-IE102-M

HC2-IE105-M

HC2-IE302-M

HC2-IE305-M



NPT ½” thread for maximum 100 bar / 1450 PSI



Filter base (SP-MSB15). Filter cartridge to be ordered separately (see

Accessories)




G ½” thread for maximum 100 bar / 1450 PSI







NPT ½” thread for maximum 100 bar / 1450 PSI



Filter base (SP-MSB15). Filter cartridge to be ordered separately (see

Accessories)


Note 1:

HC2-IExxx-M probes are the same as HC2-IExxx but are equipped with a stainless steel connector instead of

PPS.

Note 2:

To avoid measurement errors, temperature should be the same on both sides of the mounting wall



Document code



Rotronic AG


Unit


Document Type

Page 12 of 31

Document title

General description

3 General description

3.1 Power supply

The accuracy specified for the HC2 probes is valid only when the probe is supplied with a voltage within the range of 3.3…5 VDC. The probes are tested and adjusted at the factory using a supply voltage of 3.3 VDC.

When a voltage source of 3.3…5 VDC is not available, the probe should be used together with a voltage adapter

(see separate document E-M-HC2-accessories) so as to provide 3.3…5 VDC to the probe. Use of a voltage adapter allows powering the probe from a voltage source of 5 to 24 VDC or 5 to 16 VAC.

During start-up the typical current consumption of the probe is initially 8 mA during 2ms and 5 mA during the next 2s. Without a power supply limiter, the start-up current may reach a maximum of 50 mA. After start-up the current consumption is on average less than 3 mA. Randomly distributed current spikes of maximum 1 mA during 2μs are normal during operation and are caused by the probe micro-processor and associated components.

The HC2 probes are polarity protected by a keyed connector. There is no electrical polarity protection.

3.2 Measured parameters

The HC2 probe measures relative humidity with a ROTRONIC Hygromer

® temperature with a Pt100 RTD.

IN1 capacitive sensor and

3.3 Calculated parameters

Using the ROTRONIC HW4 software, the HC2 probe can be configured by the user to calculate either the dew point or the frost point.

3.4 Analog output signals

The HC2 probe features two 0…1 V linear analog output signals. The default factory settings are as follows:

Output 1: 0…1 V (humidity)

Output 2: 0…1 V (temperature)

= 0…100 %RH

= -40…60˚C

Using the ROTRONIC HW4 software any output signal can be made to correspond one of the following: humidity

 Temperature

 Dew or frost point

The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99.

If so desired, any output can also be disabled (no signal).

The D/A converters used to generate the analog output signals feature a 16-bit resolution. The 0…1 V analog output signals exhibit a small positive offset of 3 mV or less at 0 V.

Minimum load requirements apply to the external device or circuit connected to the probe voltage outputs. These requirements are defined in the “Operation” chapter

Note: users who require an analog signal other than 0…1 V should either contact ROTRONIC or connect the probe to one of the available transmitters.



Document code



Rotronic AG


Unit


Document Type

Page 13 of 31

Document title

3.5 Digital interface

The HC2 probe features a UART interface (Universal Asynchronous Receiver Transmitter) that allows two-way communication with the probe. For connecting the HC2 probe to a PC, use any of the following digital adapter cables AC3001, AC3002 or AC3005 (see document E-M-HC2-accessories). The probe can also be indirectly connected to a PC using an instrument from the ROTRONIC program.

The ROTRONIC HW4 software (version 2.1.0 or higher) allows full access to the following:

 Measurement data (humidity and temperature) and calculated parameter (dew or frost point)

 Probe information: name, RS-485 address, humidity sensor status, etc.

 Probe alarm functions

 Probe data logging function

 Probe calibration and probe adjustment functions

 Probe

The ROTRONIC HW4 software (version 3.3.0 or higher) allows full access to the following:

 Firmware update of HygroClip probes

Communication protocol options

The probe measurement data can be read without having to use the ROTRONIC HW4 software. Starting with firmware version 1.3, the HC2 probe offers the following communication protocol options (ASCII) which can be selected by connecting the probe to a PC running the ROTRONIC HW4 software (version 2.1.1 or higher): o

RO-ASCII: this is the standard (default) communication protocol used by all AirChip 3000 devices and by the HW4 software. In principle, this protocol supports all of the AirChip 3000 functions but some of the functions require a certain amount of computations to be carried out by an external device such as a PC. o

Custom: this communication protocol can be used to provide compatibility of the HC2 probe with an existing communication system. The Custom communication protocol is limited to reading measurement data from the HC2 probe. Functions such as device configuration, humidity and temperature adjustment, etc. are not supported. The Custom protocol is applicable to all AirChip 3000 devices with a digital interface and allows RS-485 networking o

I2C: The I2C protocol available with the HC2 probe does not allow the networking of devices and is limited to a one way communication where the HC2 probe automatically sends data during each refresh interval to an external device with I2C input.

When using either the RO-ASCII or the Custom protocol, the HC2 probe can be set to send data automatically after each refresh cycle without requiring a data request. When this mode is enabled, the receiving device must be listening at all times in order to get the measurement data.

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



Document code



Rotronic AG


Unit


Document Type

Page 14 of 31

Document title

3.6 Connector

All standard probe models of the HC2 series use the same keyed connector (male). The connector is located either directly on the probe body or at the end of a cable. The probe connector is secured to the matching female connector with a threaded collar.

Pin-out diagram

Probe connector (7-pin male – looking at probe)

Pin # Wire Color Name Function

1

2

Green

Grey

3 Red

4 Blue

VDD (+)

GND

RXD

TXD

3.3 to 5 VDC

Power and digital signal

UART

UART

5

6

7

White

Brown

Yellow

Out 1 analog (+)

Out 2 analog (+)

AGND

Humidity 0…100%RH (default)

Temperature -40…60°C (default)

Analog signal ground

3.7 Sensor protection (dust filter)

Most probes of the HC2 series are supplied with a filter to protect the sensors against dust particles and high air velocity. Depending on the probe model the following types of filter materials are used:

Material Maximum temperature Notes

Polyethylene 100 °C (212 °F)

Teflon 200 °C (392 °F)

Recommended filter material for all applications below 100 °C. Good response and good protection against fine dust particles. No water absorption or retention

Good protection against fine dust particles and salt (marine environments). Moderately slow response

Stainless steel wire mesh

200 °C (392 °F) Provides fastest response time. Not recommended in environments with fine dust particles (clogging) and in bioactive environments

Stainless steel sintered filter

200 °C (392 °F) Good response at low humidity levels. Do not use at high humidity levels. Provides best protection against abrasive particles

Note: Depending on the probe model, the dust filter is either automatically included with the probe or it must be ordered separately (see Models).



Document code



Rotronic AG


Unit


Document Type

Page 15 of 31

Document title

4 User configurable settings and functions

The HC2 probe ships configured as per the factory defaults: o

Users who intend to use the probe as a stand-alone analog device can use the probe as any conventional humidity and temperature probe. A connecting cable with active electronics may be required to power the probe. Most such users will never have to use the probe configurable settings and functions o

Users who purchased a probe for use with another ROTRONIC instrument can also use the probe right away and do not necessarily have to use the probe configurable settings and functions o

Users that intend to use the probe as a stand-alone digital device typically need to use a connecting cable with active electronics and generally need to configure either the probe or the PC

Making use of the probe 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 probe functions and also indicated the factory default settings.

4.1 Function overview

MEASUREMENT ACCURACY AND RELIABILITY

AirChip 3000 Functions

► Humidity / temperature adjustment

► Automatic humidity sensor test

and optional drift compensation

► Data recording

Description

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

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)

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 probe is powered off, the recording session is paused but not ended As long as the recording session has not been ended, the probe 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



Document code



Rotronic AG


Unit


Document Type

Page 16 of 31

Document title

MEASUREMENT LOOP VALIDATION


► Simulator mode

Description

Used to make the probe generate fixed values for the humidity, temperature and calculated parameter. Can be configured, enabled or disabled

SAFEGUARDS


► Device write protection

Description

Used to protect the probe with a password to prevent unauthorized digital access by a digital user. Can be configured, enabled or disabled

PROCESS PROTECTION / PROTECTION OF OTHER DEVICES


► Limit humidity output to 100 %RH

► Out-of-limit value alarm

► Bad sensor alarm

► Fail safe mode

Description

Used to prevent the humidity signal from exceeding

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

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

Built-in function. Cannot be disabled

A bad humidity or temperature sensor triggers a digital alarm

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

4.2 Factory default settings

Note: Configuration of the probe by the user and access to its functions requires a PC with the ROTRONIC

HW4 software (version 2.1.1 or higher) installed. For connecting the HC2 probe to a PC, use any of the following digital adapter cables AC3001, AC3002 or AC3005 (see document E-M-HC2-accessories).

Configurable Settings Factory default

Unit system (Metric or English)

Psychrometric calculation

Output 1 parameter, scale and unit

Output 2 parameter, scale and unit

Communication protocol

RS-485 address

Device name

Metric

None

Humidity: 0…100%RH

Temperature: -40…60 ˚C

RO-ASCII

0

Probe type



Document code



Rotronic AG


Unit


Document Type

Page 17 of 31

Document title

Functions

Humidity / temperature adjustment

Device write protection

Limit humidity output to 100 %RH

Out-of-limit value digital alarm

Data recording

Automatic humidity sensor test

Humidity sensor drift compensation

Factory default

Enabling / Disabling only by HW4 user rights possible

Disabled

Enabled

Disabled

Disabled

Disabled

Disabled

Fail safe mode Disabled

Simulator mode Disabled o

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

Instructions regarding the configuration of the probe and access to its functions are provided in the following manuals:

E-M-HW4v3-Main

E-M-HW4v3-F2-001

E-M-HW4v3-DR-001

E-M-HW4v3-A2-001

E-M-AC3000-CP

.



Document code



Rotronic AG


Unit


Document Type

Page 18 of 31

Document title

5 Mechanical installation

Note: the following instructions apply only to the situation where the HC2 probe is fixed installed.

5.1 General guidelines for fixed installation

For best results, please observe the following guidelines: o

Install the probe at a location where humidity, temperature and pressure conditions are representative of the environment or process to be measured. Avoid the following: (a) Close proximity of the probe to a heating element, a cooling coil, a cold or hot wall, direct exposure to sun rays, etc. (b) Close proximity of the probe to a steam injector, humidifier, direct exposure to precipitation, etc. (c) Unstable pressure conditions resulting from excessive air turbulence. o

When installing the probe on a wall, do not place the probe right above a heat producing device of instrument such as a transmitter or an Ethernet adapter (warm air tends to rise). o

If possible, choose a location that provides good air movement at the probe: air velocity of at least 1 meter/second (200 ft/ minute) facilitates adaptation of the probe to changing temperature

. o

When installing the probe through a wall, immerse as much of the probe as possible in the environment to be measured.

Position the probe so as to 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.

Depending on the probe model, a probe holder (mounting flange with a compression fitting) can facilitate installation through a wall.

Future maintenance can be made easier by providing next to the probe a calibration access orifice. During maintenance, this permits the insertion of a reference probe (calibrator).The calibration access orifice should have the same size as the orifice used to install the probe and can be equipped with a probe holder.



Document code



Rotronic AG


Unit


Document Type

Page 19 of 31

Document title

6 Electrical installation

Note: the following instructions apply only to the situation where the HC2 probe is fixed installed.

6.1 General guidelines for fixed installation

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 HygroClip 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)

 direct and alternate current > 400 V

(unshielded)



Telephone lines

 lines leading into EX-rated areas

in separated bundles or channels / conduits, without minimum distance in separated bundles or channels / conduits, without minimum distance



Document code



Rotronic AG


Unit


Document Type

Page 20 of 31

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 Analog signal wiring

Preferably use a shielded cable to connect the analog outputs of the HC2 to other devices. The maximum cable length is determined by the maximum error that the user will accept. This can be calculated as follows:

Error (V) = cable resistance x current through load

6.3 Minimum analog output load

The HC2 analog outputs are short circuit tolerant and have an internal resistance of less than 10 Ω

For proper operation, the minimum external load of each output should be at least 1000 Ω.

6.4 Digital signal wiring

Use one of the available connecting cables (see Accessories) to connect the UART digital interface of the

HC2 probe to other devices. Without a signal booster, the maximum cable length should not exceed 5 m

(16 ft).

6.5 Grounding

In the case of a fixed installation, ground the HC2 probe, especially if the electronics will be subjected to a low humidity environment (35 %RH or less). The power supply and digital ground (GND) and the analog ground

(AGND) should be tied separately to a proper ground so as to avoid spikes in the analog signals.

7 Operation

7.1 Operation with an indicator, data logger or transmitter

The HC2 probes are compatible with a large number of indicators, data loggers and transmitters from

ROTRONIC. Operating instructions are provided in each device manual.

7.2 Stand-alone operation as an analog probe

The HC2 probes can be used as a conventional analog probe. See Accessories, supply voltage adapters, connectors and cables. Use the HW4 software to configure the probe as desired, complete the mechanical and electrical installation and power up the probe.



Document code



Rotronic AG


Unit


Document Type

Page 21 of 31

Document title

7.2.1

Minimum load requirements for the probe voltage outputs

The following requirements apply to any external device or circuit connected to the probe voltage outputs:

HC2

Voltage Output

RL

HFC2 output signal Input resistance RL

0…1V >=1kOhm

GND

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 probe voltage output.

VCC

HC2 signal

HC2

Voltage Output

R Pull-up

RL

0…1V

HC2 signal

0…1V

HC2 signal

VCC

3.3V

VCC

5.0V

VCC

GND

0…1V 10.0V

R pull-up

≥ 250 kOhm

R pull-up

≥ 400 kOhm

R pull-up

≥ 1 MOhm

RL

1 kOhm

RL

1 kOhm

RL

1 kOhm



Document code



Rotronic AG


Unit


Document Type

Page 22 of 31

Document title

7.3 Stand-alone operation as a digital probe (PC or network)

The HC2 probes can be connected to a PC or to an Ethernet network with one of the available digital interface adapters (see Accessories). Probe configuration and full access to all probe functions requires a PC with the

ROTRONIC HW4 software installed. Starting with firmware version 1.3, the probes accept several communication protocols that allow users to read the measurement data without the HW4 software. When using the standard RO-ASCII protocol, access to some of the probe functions is also possible without HW4.

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

7.4 Connectivity examples for stand-alone probes

Digital connection example: RS-485 network

240



Master

Addr. 1

RS-485 device connectors

(T Connection)

E2-01XX-MOD

Adapter

240



Slave

HC2 probe

Addr. n

USB or TCP/IP port

Notes: o

The master device can be either a transmitter such as the HF5 (USB or TCP/IP interface) or an adapter such as the AC3010 cable (USB) o

Power to the combination E2-01XX-MOD and HC2 probe can be provided by an individual AC adapter or by a central voltage source connected to the RS-485 network (requires cables with 2 twisted pairs: one for the data, the other for power)



Document code



Document title

Analog connection example:

Rotronic AG


Unit


Document Type

Page 23 of 31

Voltage Source

5…24 VDC or

5…16 VAC

E2-01XX-ACT

Voltage

Adapter

HC2 probe

Cable ended with open wires

2 x analog signal

0…1 VDC

Controller

(or other)

7.5 Hand-held probes used with an indicator

The most common source of error when measuring relative humidity with a hand-held probe is a difference between the temperature of the probe and the temperature of the environment. At a humidity condition of 50

%RH, a temperature difference of 1

C (1.8 F) typically results in an error of 3 %RH on relative humidity.

When using a humidity probe with a portable indicator, it is good practice to monitor the display for temperature stability. When moving the probe from one area to another, the probe should be given sufficient time to equilibrate with the environment to be measured. This time can be shortened, and errors avoided, by using the probe configuration that fits best for your application.

In extreme situations, condensation may occur on the sensors when the probe is colder than the environment.

As long as the humidity / temperature limits of the humidity sensor are not exceeded, condensation does not alter the calibration of the sensor. However, the sensor has to dry out before it can provide a valid measurement.

Non-moving air is an excellent insulator. When there is no air movement, surprising differences in temperature and humidity can noted over short distances. Air movement at the probe generally results in measurements that are both faster and more accurate.



Document code



Rotronic AG


Unit


Document Type

Page 24 of 31

Document title

8 Maintenance

8.1 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.



If the probe has a removable cartridge, simply replace the cartridge (leave the metal base on the probe).



If the probe has a plastic slotted cap with a built-in filter element follow these instructions:

1) Unscrew the filter from the probe and pull it straight away, in the alignment of the probe, so as not the catch the humidity and temperature sensors.

2) 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 necessary, correct the alignment by tapping the sensor very gently with a smooth object such as a small plastic rod. Do not use sharp pliers or tweezers as this could puncture the sensor and do not pull hard on the sensor.

8.2 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 probe should be verified every 6 to 12 months. Applications where the probe is exposed to contaminants may require more frequent verifications. Calibration and adjustment of the

HC2 probe can be done with either a PC with the HW4 software installed (version 2.1.0 or higher) or with the

HP23 hand-held calibrator. For connecting the HC2 probe to a PC, use any of the following digital adapter cables AC3001, AC3002 or AC3005 (see document E-M-HC2-accessories).

Procedure for adjusting the HC2 probe with the ROTRONIC HW4 software:

 Connect the HC2 probe to the HW4 PC as explained in the HW4 manual E-M-HW4v3-Main

 Start HW4 software on the PC and search for the HC2 probe. (HW4 Main Menu Bar > Devices and

Groups > Search for USB masters or Search for RS232 masters or search for Ethernet masters, depending on the connecting cable).

 After finding the HC2 probe with HW4, expand the device tree to see the HC2 probe functions and select Probe Adjustment.

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

8.3 Validation of the output signals transmission

If so desired, transmission of the HC2 probe output signals can be validated by using the probe simulator function. The HW4 software is required to enable and configure this function. When the function is enabled the probe generates digital and analog signals corresponding to values specified by the user.



Document code



Rotronic AG


Unit


Document Type

Page 25 of 31

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. For connecting the HC2 probe to a PC, use any of the following digital adapter cables AC3001, AC3002 or AC3005 (see document E-M-HC2-accessories).

Procedure for updating the firmware:

 Connect the HC2 probe to the HW4 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 HC2 probe. (HW4 Main Menu Bar > Devices and

Groups > Search for USB masters or Search for RS232 masters or search for Ethernet masters, depending on the connecting cable).

 After finding the HC2 probe, expand the device tree to see the HC2 probe functions. Select Device

Manager. In the Device Manager menu bar select Tools > Firmware Update. For instructions see document E-M-HW4v3-F2-001



Document code



Document title

10 Technical data

10.1 Specifications

General

Device type

Mechanical configuration

Power supply and connections

Supply voltage (VDD)

Recommended supply voltage

Supply voltage during factory tests and adjustment

Supply voltage stability / ripple

Nominal current consumption

Maximum start-up current unlimited

Minimum start-up current

Maximum current spike during operation

Polarity protection

Humidity measurement

Humidity temperature probe

See models

3.3 … 5 VDC ± 0%

3.3 VDC

3.3 VDC

See System Accuracy, effect of VDD

< 4.5 mA at VDD = 3.3…5 VDC

< 50mA during 2µs

8 mA during 2ms and 5 mA during 2s

1 mA during maximum 2µs

Mechanical only (keyed connector)

Rotronic AG


Unit


Document Type

Page 26 of 31

Measuring range

Measurement accuracy at 23 °C with 3.3 VDC supply voltage

0…100 %RH

±0.8 %RH (w. standard adjustment profile)

±1.0 %RH for models HC2-C04 and HC2-C05 (see also §10.3)

Long term stability

Sensor time constant

< 1 %RH / year

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

Temperature measurement

Sensor

Measuring range

Measurement accuracy at 23 °C with3.3 VDC supply voltage

Pt100 RTD, IEC 751 class A

-100…200 °C (see also environmental limits)

±0.1 °C

±0.3 °C for models HC2-C04 and HC2-C05 (see also §10.3)

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

Psychrometric calculations

Start-up time and data refresh rate

Start-up time

Data refresh rate

Dew or frost point (user configurable)

1.5s (typical)

1.0s (typical) – when not calculating any parameter



Document code



Rotronic AG


Unit


Document Type

Page 27 of 31

Document title

Configurable analog outputs

Output 1

Factory default parameter

Factory default scale

Output 2

Factory default parameter

Factory default scale

Output 1 and Output 2

User configurable scaling limits

Offset at 0 V

Ripple

Short circuit tolerant

Internal resistance

Minimum external load

Deviation from digital signal

Digital interface

Interface type

Organization

Can be made to correspond to any parameter

Relative humidity

0…100 %RH

Can be made to correspond to any parameter

Temperature

-40…60 °C

-999.99 … 9999.99 engineering units

+ 3 mV (maximum)

< 1.2 mV/x 2µs

Yes

< 10 Ω

1000 Ω

< ±1 mV from 0.002 to 1.0 V / + 2 mV from 0.0 to 0.002 V

Default configuration

UART (Universal Asynchronous Receiver Transmitter)

Dialog, duplex

Baud rate : 19200

Parity : none

Data bits : 8

Stop bits : 1

Flow Control : none

Baud rate configuration:

Logical levels

Maximum cable length

No

Logical 0: < = 0.3V * VDD

Logical 1: > = 0.8V * VDD

5 m (16.4 ft) w/o signal booster

Effect of VDD in the range 3.3 to 5.0 V (see note below)

Temperature (digital) <0.05 °C

Humidity (digital) <0.25 %RH

Analog signals <2mV (reference: digital value)

Note: for models HC2-IC, HC2-IM and HC2-IE, VDD is limited to 3.3 V ± 0.1V

General specifications

Housing material

Collar material (connector)

See Models

Alu-Anticorodal (anodized)

Dust filter material

Protection grade

Physical dimensions

See Models

IP 65

See Models



Document code



Rotronic AG


Unit


Document Type

Page 28 of 31

Document title

Conformity to standards

CE / EMC immunity

Solder type

FDA / GAMP directives

Environmental limits

Storage and transit

Operating limits at electronics

Temperature limits at sensor

Maximum humidity at sensor

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

Lead free (RoHS directive) compatible

-50…+100 °C / 0…100 %RH, non condensing

-40 … +100 °C

0…100 %RH, non condensing

See Models

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)

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

Humidity sensor: as per DV04-14.0803.02 - Critical chemicals

Maximum air velocity at probe

Critical environments

10.2 Dew point accuracy

The HC2 probes 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 dew point value of -37 ˚C is measured with an accuracy of

± 1.0 ˚C or better.



Document code



Rotronic AG


Unit


Document Type

Page 29 of 31

Document title

10.3 Effect of cable temperature on the accuracy of probes HC2-C04 and

HC2-C05

Accuracy of the HC2-C04 and HC2-C05 probes is affected by the temperature of the cable separating the sensors from the electronics.

Error on humidity:

Humidity measurement accuracy is specified at ±1.0 %RH when both the humidity sensor and the cable are at

23 °C. Depending both on the value of temperature and on the exposed length of cable, the probe exhibits a predictable error (bias) as illustrated below:

Systematic error as a function of the length of cable exposed to temperature

10

8

6

4

2

0

-2

-4

-6

-40 °C

-20 °C

0 °C

23 °C

40 °C

60 °C

85 °C

-8

-10

0 20 40 60 80 100 120

Cable Length [cm]

140 160 180 200

Error on temperature:

Temperature measurement accuracy is specified at ±0.3 °C when both the temperature sensor and the cable are at 23 °C. When the full length of the 2 meter probe cable is exposed to temperature values within the range of -40 to 85 °C, the additional error is limited to 0.125 °C.

11 Accessories and parts

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

12 Supporting documents

Document File Name Contents

E-M-HC2-accessories

Accessories and parts for probes, indicators and transmitters



Document code



Document title

Document File Name

E-T-AC3000-DF-V1

Rotronic AG


Unit


Document Type

Page 30 of 31

Contents

AirChip 3000 Description and Main Functions

E-M-HW4v3-DIR

E-M-HW4v3-Main

E-M-HW4v3-F2-001

E-M-HW4v3-A2-001

List of the HW4 manuals

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

HW4 software version 3: HC2 probe series

Device configuration and AirChip 3000 functions

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

E-M-TCPIP-Conf

E-M-CalBasics

AirChip 3000 Communication Protocol

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

Temperature and humidity adjustment basics

Instructions for using the ROTRONIC humidity standards

E-T-HumiDefs

Humidity Definitions

Note: All document file names have an extension corresponding to the document release number (example of a first release: E-M-HW4v2-Main_10). This extension is not shown in the above table.

13 Document releases

Doc. Release Date

_20 Apr. 11, 2009

Notes

Original release

_22

_23

_24

_25

Jun. 18, 2010

May 20, 2011

Jan. 6, 2012

May 30, 2013

Updated document to HW4 software v.3

Modified dimensional specifications of the HC2-C04 probe

Changed the factory default for data recording to “disabled”

Page 10: reduced maximum pressure to 100 bar / 1450 PSI for the HC2-IE102/105 and HC2-IE302/305

Changes for HygroClip2 with firmware v3.0

Power supply range changed to 3.3…5 VDC

HC2-IE maximum pressure range changed to 100 bar.

Added HC2-SM

Added HC2-IMxxx-M

Added HC2-IExxx-M



Document code



Document title

Rotronic AG


Unit


Document Type

Page 31 of 31


HygroClip 2 (HC2) Humidity Temperature Probes User Guide

HygroClip 2 (HC2) Humidity Temperature Probes

User Guide

Communication protocol options

Power supply wiring

General guidelines for signal cables

Lightning protection

Minimum load requirements for the probe voltage outputs

Systematic error as a function of the length of cable exposed to temperature

Related manuals

Rotronic

HC2HP28

Rotronic

HF520 v1.13

Rotronic

XB OEM

Rotronic

MP100H / 400H

Rotronic

HygroMet MP102H / 402H

Rotronic

HC2-AW-USB