Rotronic 0210.HC2A-SM User manual

© 2016  ROTRONIC AG  Bassersdorf  Switzerland

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Humidity Temperature Probes

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Table of contents

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

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

2 Models .................................................................................................................................................... 4

3 General description ............................................................................................................................... 8

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

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

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

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

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

3.6 Communication protocol .................................................................................................................... 13

3.7 Connector .......................................................................................................................................... 14

3.8 Filter and probes overview matrix ...................................................................................................... 15

3.9 Sensor protection (dust filter) ............................................................................................................. 16

4 User configurable settings and functions ......................................................................................... 18

4.1 Function overview .............................................................................................................................. 19

4.2 Factory default settings ...................................................................................................................... 21

5 Mechanical installation ....................................................................................................................... 22

6 Electrical installation ........................................................................................................................... 23

6.1 General connection information ......................................................................................................... 23

6.2 Signal cable information ..................................................................................................................... 23

6.3 Analog signal wiring ........................................................................................................................... 24

6.4 Digital signal wiring ............................................................................................................................ 24

6.5 Grounding .......................................................................................................................................... 24

7 Operation .............................................................................................................................................. 25

7.1 Minimum load requirements for the probe voltage outputs ................................................................ 25

7.2 Connectivity examples for stand-alone probes................................................................................... 26

7.3 Hand-held probes used with an indicator ........................................................................................... 27

8 Maintenance ................................................................ ......................................................................... 28

8.1 Cleaning or replacing the dust filter .................................................................................................... 28

8.2 Periodic calibration check .................................................................................................................. 28

8.3 Validation of the output signals transmission ..................................................................................... 28

9 Firmware updates ................................................................................................................................ 29

10 Technical data ...................................................................................................................................... 30

11 Accessories and parts ........................................................................................................................ 33

12 Supporting documents ....................................................................................................................... 34

13 Document releases .............................................................................................................................. 35

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Applicability:

This manual applies to all HC2A probes with firmware version 1.x. 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 HC2A series are digital humidity-temperature probes based on the AirChip3000 technology. These probes
feature a UART serial interface and two 0…1 V linear analog output signals.

The HC2A probes are designed for use with the HygroClip2 generation of ROTRONIC humidity-temperature
instruments: transmitters, data loggers, hand-helds, etc.
The HC2A 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 HC2A probes offer the following user functions:

o User configurable settings
o Calculation of the dew or frost point
o Humidity temperature calibration and adjustment
o Simulator mode
o Data recording

The ability for the user to easily update the AirChip3000 firmware means that the HC2A probes can be kept up­to-date regarding any future functionality improvement.
Available in different configurations, the HC2A probe series is designed to meet the requirements of a large
number of applications and environments.

1.1 Hardware and software compatibility

The HC2A probes are compatible only with the AirChip3000 generation of ROTRONIC humidity-temperature
instruments.
Configuration of the HC2A probes and access to the probe functions requires a PC with the ROTRONIC HW4
software version 3.7 or higher or connection to a compatible instrument from ROTRONIC.

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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:

o The HC2A 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).

o The HC2A Probes can also be used as a standalone 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.

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Climate measurement

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

HC2A-S

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, black
Standard dust filter: Polyethylene, 40 µm
Sensor: HYGROMER® HT-1
Weight: 17 g (0.6 oz)

HC2A-S3

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, white
Standard dust filter: Polyethylene, 40 µm
Sensor: HYGROMER® HT-1
Weight: 17 g (0.6 oz)

HC2A-SH

Accuracy: ±0.5 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, black
Standard dust filter: Polyethylene, 40 µm
Sensor: HYGROMER® HT-1
Weight: 17 g (0.6 oz)

HC2A-S3H

Accuracy: ±0.5 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, white
Standard dust filter: Polyethylene, 40 µm
Sensor: HYGROMER® HT-1
Weight: 17 g (0.6 oz)

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HC2A-SG

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, black
Standard dust filter: Polyethylene, 40 µm
Sensor: HYGROMER® HT-1
Weight: 17 g (0.6 oz)

HC2A-S-HH

Accuracy: ±1.0 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…90 %RH
Temperature limits: 0…60 °C (32…140 °F)
Diameter: 15 mm (0.6”)
Length: 108 mm (3.3”)
Housing material: Polycarbonate, black
Standard dust filter: None
Sensor: HYGROMER® HH-1
Weight: 17 g (0.6 oz)

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Climate measurement

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

HC2A-SM

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits: -50…100 °C (-58…212 °F)
Diameter: 15 mm (0.6”)
Length: 109 mm (3.3”)
Housing material: Stainless steel, DIN 1.4301
Standard dust filter: Wiremesh filter, 10 µm, DIN 1.4401
Sensor: HYGROMER® HT-1
Weight: 50 g (1.76 oz)

Process measurement

For use with transmitters and data loggers

HC2A-IC102
HC2A-IC105

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 mm (0.6”)
Length (probe head): 144 mm (5.7”)
Cable length: 2 m (6.5 ft) / 5 m (16.4 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 230 g (8.1 oz), 2 m cable / 470 g (16.6 oz), 5 m cable

1

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

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HC2A-IC302

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 mm (0.6”)
Length (probe head): 294 mm (11.6”)
Cable length: 2 m (6.5 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 260 g (9.2 oz), 2 m cable

1

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

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Process measurement

For use with transmitters and data loggers

HC2A-IC402-A

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 / 25 mm (0.6” / 1.0”)
Length (probe head): 400 mm (3.3”)
Cable length: 2 m (6.5 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 320 g (11.3 oz), 2 m cable

HC2A-IC702-A

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 / 25 mm (0.6” / 1.0”)
Length (probe head): 700 mm (27.5”)
Cable length: 2 m (6.5 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 380 g (13.4 oz), 2 m cable

1

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

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Process measurement

For use with transmitters and data loggers

HC2A-IM102-M

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 mm (0.6”)
Length (probe head): 130 mm (4.7”)
Cable length: 2 m (6.5 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 230 g (8.1 oz), 2 m cable

HC2A-IM302-M
HC2A-IM305-M

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 (-148…374 / 392 °F)
Diameter barrel: 15 mm (0.6”)
Length (probe head): 280 mm (11.0”)
Cable length: 2 m (6.5 ft)
5 m (16.4 ft)
Housing material: PEEK
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 260g (9.17 oz), 2 m cable
500g (17.6 oz), 5 m cable

1

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

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Measurement in compressed air conduits and vessels

For use with transmitters and data loggers

HC2A-IE02-G

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C1 2 (-148…374 / 392 °F)
Thread: G1/2”
Recommended torque: 70 Nm
Pressure resistant: 100 bar / 1450 PSI
Length (probe head): 148 mm (5.8”)
Cable length: 2 m (6.5 ft)
Housing material: Stainless steel, DIN 1.4301
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 290 g / (10.2 oz), 2 m cable

HC2A-IE02-NPT

Accuracy: ±0.8 %RH, ±0.1 K at 10…30 °C
Humidity measuring range: 0…100 %RH
Temperature limits at sensor: -100...190 °C / 200 °C

1 2

(-148…374 / 392 °F)
Thread: NPT ½”
Recommended torque: 70 Nm
Pressure resistant: 100 bar / 1450 PSI
Length (probe head): 148 mm (5.8”)
Cable length: 2 m (6.5 ft)
Housing material: Stainless steel, DIN 1.4301
Standard filter: None, must be ordered separately
Sensor: HYGROMER® HT-1
Weight: 290 g / (10.2 oz), 2 m cable

1

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

2

The sealing ring withstands only -40…100°C

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3 General description

3.1 Power supply

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.
The HC2A probes are polarity protected by a keyed connector. There is no electrical polarity protection.

3.2 Measured parameters

The HC2A probe measures relative humidity with a ROTRONIC HYGROMER® HT-1 capacitive sensor and
temperature with a Pt100 RTD.

3.3 Calculated parameters

Using the ROTRONIC HW4 software, the HC2A probe can be configured by the user to calculate either the dew
point or the frost point.

3.4 Analog output signals

The HC2A probe features two 0…1 V linear analog output signals. The default factory settings are as follows:

Output 1: 0…1 V (humidity) = 0…100 %RH

Output 2: 0…1 V (temperature) = -40…60˚C

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

o Relative humidity
o Temperature
o 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 10 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.

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3.5 Digital interface

The HC2A probe features a UART interface (Universal Asynchronous Receiver Transmitter) that allows two­way communication with the probe. For connecting the HC2A probe to a PC, use a digital adapter cable AC3001
(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 3.7.0 or higher) allows full access to the following:

o Measurement data (humidity and temperature) and calculated parameter (dew or frost point)
o Probe information: name, RS-485 address, humidity sensor status, etc.
o Probe alarm functions
o Probe data logging function
o Probe calibration and probe adjustment functions
o Probe configuration
o Firmware update of HygroClip2 probes

3.6 Communication protocol

The probe measurement data can be read without having to use the ROTRONIC HW4 software. The HC2A
probe offers the following communication protocol options (ASCII) which can be selected by connecting the
probe to a PC running the ROTRONIC HW4 software:

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 HC2A probe with an

existing communication system. The Custom communication protocol is limited to reading measurement
data from the HC2A 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 HC2A probe does not allow the networking of devices and is

limited to a one way communication where the HC2A 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 HC2A 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

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3.7 Connector

All standard probe models of the HC2A 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 (7-pin male – looking at probe)

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3.8 Filter and probes overview matrix

Temperature
range

HC2A-S

HC2A-S3

HC2A-SH

HC2A-S3H

HC2A-S-HH

HC2A-SM

XD33A-S3X

HC2A-ICxxx

HC2A-Icxxx-A

HC2A-IMxxx-M

HC2A-IExxx

SPA-PCB

SPA-PCW

-100…200°C SPA-SS
SPA-PCB-PE

SPA-PCB-PTFE

SPA-PCB-WM

SPA-PCW-PE

SPA-PCW-PTFE

SPA-PCW-WM

SPA-SS-PE

SPA-PE

SPA-SS-PTFE

SPA-SS-WM

SPA-SSS

SPA-WM

SPA-PTFE

X

Probes

X

XXXXX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

-100…200°C

X

X

X

X

X

X

X

X

X

X

XXX

-50…100°C

-50…100°C

XXX

X

X

X

X

Attention! The area of application depends on the component with the most restricted temperature range.

-50…100°C

-40…85°C

-100…200°C

Carrier

X

X

Filter&Carrier

XXX

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3.9 Sensor protection (dust filter)

Most probes of the HC2A series are supplied with a filter to protect the sensors against dust particles and high
air velocity. Following filters and carriers are available:

Filter carrier

Order code

Picture

Drawing

Material

Temperature range

SPA-PCB

Polycarbonate, black

-50…100 °C
(-58…212 °F)

SPA-PCW

Polycarbonate, white

-50…100 °C
(-58…212 °F)

SPA-SS

Stainless steel, 1.4301

-100…200 °C

(-148…392 °F)

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Carrier only

Wire mesh filter

PE filter

PTFE filter

Stainless steel

Filter

Material

PC / 1.4301

1.4401

Polyethylene

PTFE

1.4404

Pore size

-

10 µm

40-50 µm

10 µm

25 µm

Temperature
range

-50…100 °C

-100…200 °C

(-148…392 °F)

-50…100 °C

(-58…212 °F)

-80…200 °C

(-112…392 °F)

-100…200 °C

(-148…392 °F)

Response
time %RH3

12 s

12 s

15 s

18 s

15 s

Response
time °C4

80 s

180 s

180 s

170 s

-

Response
time °C5

120 s

190 s

210 s

210 s

200 s

Waterproof

(dipping 50mm)

No

No

Yes

Yes

No

Max. wind
speed

5 m/s

50 m/s

50 m/s

50 m/s

70 m/s

Suitable for
fine dust

No

No

>10 µm

Yes

No

General
information

Fast response

time

High

temperature, fast

response time,

fast drying,

mechanically

robust

Standard filter

High chemical

resistance, fine

dust risistant,

high temperature

High wind speed,

abrasive

environment, high

mechanical

protection

Application

Sterilization,

H2O2,

handheld

devices

Meteo,

agriculture,

climatic

chambers,

storage rooms,

cheese cellar

HVAC, office,

storage rooms,

laboratory, clean

rooms

Cleanrooms,

medical, injection

chamber, meal

manufacturing

HVAC with high

wind speed,

industrial

applications

3

T63: 100 %RH → 30 %RH

4

PC carrier: 70 °C → 23 °C

5

Stainless steel carrier: 70 °C → 23 °C

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4 User configurable settings and functions

The HC2A 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.

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4.1 Function overview

MEASUREMENT ACCURACY AND RELIABILITY

AirChip3000 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

► Data recording

The data recording function differs from a true data logging
function in the sense that the AirChip3000 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.

MEASUREMENT LOOP VALIDATION

AirChip3000 Functions

Description

► Simulator mode

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

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SAFEGUARDS

AirChip3000 Functions

Description

► Device write protection

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

AirChip3000 Functions

Description

► 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

► Bad sensor alarm

Built-in function. Cannot be disabled
A bad humidity or temperature sensor triggers a digital alarm

► 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

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4.2 Factory default settings

Configurable Settings

Factory default

Unit system (Metric or English)

Metric

Psychrometric calculation

None

Output 1 parameter, scale and unit

Humidity: 0…100%RH

Output 2 parameter, scale and unit

Temperature: -40…60 ˚C

Communication protocol

RO-ASCII

RS-485 address

0

Device name

HC2A

Functions

Factory default

Humidity / temperature adjustment

Enabling / Disabling only by HW4 user rights possible

Device write protection

Disabled

Out-of-limit value digital alarm

Disabled

Data recording

Disabled

Fail safe mode

Disabled

Simulator mode

Disabled

For a detailed description of all AirChip3000 / probe main functions see document E-T-AC3000-DF-V1.
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

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5 Mechanical 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.

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6 Electrical installation

This section describes the general safety precautions for electric wiring.

6.1 General connection information

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.

6.2 Signal cable information

The following guidelines are derived from the European standard EN 50170 for the transmission of signals by
copper wires. Note on installation planning: when determining the position of machinery and equipment, the
rules given in EN 50170 should be followed with due regard to local circumstances.
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:

o Bus signals such as RS485
o Data signals for PCs, printers etc.
o shielded analog inputs
o unshielded direct current (<= 60V)
o shielded process signals (<= 25 V)
o unshielded alternate current (<= 25V)
o coaxial cables for CRT monitors

in common bundles or channels / conduits

o direct current from 60 V to 400 V

(unshielded)

o alternate current from 25V to 400 V

(unshielded)

in separated bundles or channels /
conduits, without minimum distance

o direct and alternate current > 400 V

(unshielded)

o Telephone lines
o lines leading into EX-rated areas

in separated bundles or channels /
conduits, without minimum distance

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6.3 Analog signal wiring

Preferably use a shielded cable to connect the analog outputs of the HC2A 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

6.4 Digital signal wiring

Use one of the available connecting cables (see Accessories) to connect the UART digital interface of the HC2A
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 HC2A 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.

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7 Operation

The HC2A probes are compatible with a large number of indicators, data loggers and transmitters from
ROTRONIC. Operating instructions are provided in each device manual. The HC2A probes can also 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.

7.1 Minimum load requirements for the probe 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 probe voltage output.

HC2A signal

VCC

R pull-up

RL

0…1V

3.3V

≥250 kOhm

1 kOhm

0…1V

5.0V

≥400 kOhm

1 kOhm

0…1V

10.0V

≥1 MOhm

1 kOhm

R Pull-up

RL

GND

VCC

HC2A

Voltage Output

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7.2 Connectivity examples for stand-alone probes

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

The HC2A 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. 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.

Digital connection example: RS-485 network

Note:

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 HC2A 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)

USB or TCP/IP port

Master

Addr. 1

E2-01XX-MOD

Adapter

Slave

HC2A probe

Addr. n

240 

240 

RS-485 device connectors

(T Connection)

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Analog connection example:

7.3 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.

E2-01XX-ACT

Voltage

Adapter

HC2A probe

Voltage Source

5…24 VDC

or

5…16 VAC

Controller

(or other)

Cable ended with open wires

2 x analog signal

0…1 VDC

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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.

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 HC2A probe can be done with either a PC with the HW4 software installed or with the HP23 hand-held
calibrator. For connecting the HC2A probe to a PC, use a digital adapter cable AC3001 (see document E-M-
HC2-accessories).

Procedure for adjusting the HC2A probe with the ROTRONIC HW4 software:

o Connect the HC2A probe to the HW4 PC as explained in the HW4 manual E-M-HW4v3-Main
o Start HW4 software on the PC and search for the HC2A probe.
o After finding the HC2A probe with HW4, expand the device tree to see the HC2A probe functions

and select Probe Adjustment.

o 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 HC2A 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.

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9 Firmware updates

Firmware updates will be available on the ROTRONIC website for downloading. For connecting the HC2A probe
to a PC, use a digital adapter cable AC3001 (see document E-M-HC2-accessories).
Procedure for updating the firmware:

o Connect the HC2A probe to the HW4 PC as explained in the HW4 manual E-M-HW4v3-Main
o Copy the firmware update file from the ROTRONIC website to the PC.
o Start HW4 software on the PC and search for the HC2A probe.
o After finding the HC2A probe, expand the device tree to see the HC2A probe functions. Select Device

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

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10 Technical data

General

Device type

Humidity temperature probe

Mechanical configuration

See models

IP protection class

IP65 Power supply and connections

Supply voltage (VDD)

3.3…5 VDC ±0%

Nominal current consumption

<4.5 mA

Maximum start-up current unlimited

<50mA during 2µs

Minimum start-up current

8 mA during 2ms and 5 mA during 2s

Maximum current spike during
operation

1 mA during maximum 2µs
Polarity protection

Mechanical only (keyed connector)

Humidity measurement

Sensor

ROTRONIC HYGROMER® HT-1

Measuring range

0…100 %RH

Measurement accuracy

±0.8 %RH, at 10…30 °C (HC2A-S(3), HC2A-IC, HC2A-IM, HC2A-IE)
±0.5 %RH, at 10…30 °C / 10..90 %RH (HC2A-S(3)H)

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

Sensor

Pt100 RTD, IEC 751 1/3 class B

Measuring range

-100…190 / 200 °C6 (see also environmental limits)

Measurement accuracy

±0.1 °C, at 10…30 °C
±0.3 °C, at 10…30 °C (HC2A-C04, HC2A-C05; see also

§10.3)

Repeatability

0.05 °C

Long term stability

<0.1 °C / year

Sensor time constant

Typical 4 sec, 63 %RH of a step change (1 m/sec air flow at sensor)

6

The peak load at 200 °C is 100 h. See the sensor data sheet for detailed information on the pollution loads for the sensor.

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Calculated parameters

Psychrometric calculations

Dew or frost point (user configurable)

Start-up time and data refresh rate

Start-up time

1.5 s (typical)

Data refresh rate

1.0 s (typical) – when not calculating any parameter

Configurable analog outputs

Output 1

Can be made to correspond to any parameter

Factory default parameter

Relative humidity

Factory default scale

0…100 %RH

Output 2

Can be made to correspond to any parameter

Factory default parameter

Temperature

Factory default scale

-40…60 °C

Output 1 and Output 2

Signal type

0…1 V

User configurable scaling limits

-999.99 … 9999.99 engineering units

Offset at 0 V

+10 mV (maximum)

Ripple

<1.2 mV/x 2µs

Short circuit tolerant

Yes Internal resistance

<10 Ω

Minimum external load

1000 Ω

Deviation from digital signal

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

Digital interface

Interface type

UART (Universal Asynchronous Receiver Transmitter)

Organization

Dialog, duplex

Default configuration

Baud rate : 19200
Parity : none
Data bits : 8
Stop bits : 1
Flow Control : none

Tolerance

3 %

Baud rate configuration:

No

Logical levels

Logical 0: ≤ 0.3V * VDD
Logical 1: ≥ 0.8V * VDD

Maximum cable length

5 m (16.4 ft) w/o signal booster

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General specifications

Housing material

See Models

Collar material (connector)

Stainless steel, DIN 1.4301

Dust filter material

See Models

Physical dimensions

See Models

Weight

See Models

Conformity to standards

CE / EMC immunity

EMC Directive:

20.04.2016: 2014/30/EU

EN 61000-6-1: 2007, EN 61000-6-2: 2005
EN 61000-6-3: 2007+A1:2011+AC:2012, EN 61000-6-4: 2007+A1:2011

Performance

Solder type

Lead free (RoHS directive 2011/65/EU)

FDA / GAMP directives

compatible

Environmental limits

Storage and transit

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

Operating limits at electronics

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

Temperature limits at sensor

See Models

Maximum humidity at sensor

The sensor withstands 93 °Cdp. This results in the following conditions:
100 %RH up to 93 °C (203 °F)
78 %RH at 100 °C (212 °F)
34 %RH at 125 °C (260 °F)
17 %RH at 150 °C (302 °F)

Maximum air velocity at probe

50 m/s (3,28 ft /s), according to filter specifications

Critical environments

See HT-1 data sheet

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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

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12 Supporting documents

Document File Name

Contents

E-M-HC2-accessories

Accessories and parts for probes, indicators and transmitters

E-T-AC3000-DF-V1

AirChip3000 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-F2-001

HW4 software version 3: HC2A probe series
Device configuration and AirChip3000 functions

E-M-HW4v3-A2-001

HW4 software version 3: Probe Adjustment function AirChip3000 devices

E-M-HW4v3-DR-001

HW4 software version 3: Data Recording Function AirChip3000 Devices

E-M-AC3000-CP

AirChip3000 Communication Protocol

E-M-CalBasics

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

E-T-HumiDefs

Humidity Definitions

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13 Document releases

Doc. Release

Date

Notes

V1_0

August 2016

Original release

V1_1

November 2016

Waterproof is specified more in detail, page 22
Max. wind speed adapted (technical specifications)

V1_2

April 2017

Technical drawings HC2A-SM
Filter and support specifications edited
Offset analogue output +10mV

V1_3

April 2017

Legend adapted

V1_4

July 2018

HC2A-IC402/405/502/505/702/705 removed from manual

V1_5

July 2019

HC2A-IM102-M/302-M/305-M added
HC2A-IC402-A/IC702-A added
Section Filters reworked

V1_6

October 2020

HC2A-IE02-G/IE02-NPT added
Section Filters reworked

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