Functions

Description

Measured parameters

•Relative humidity using the ROTRONIC HYGROMER® HT-1 (HC2A-S-HH: HH-1) capacitive sensor

•Temperature using a PT100 1/3 Class B sensor

Calculated parameters

•Dew point

•Frost point

Humidity measurement range

0…100 %rh

Temperature measurement range

•-50…+100 °C (-58…+212 °F)

•0…+60 °C (32…+140 °F) (HC2A-S-HH)

Accuracy

•±0.5 %rh, ±0.1 K at 10…30 °C (HC2A-SH)

•±0.8 %rh, ±0.1 K at 10…30 °C

•±1.0 %rh, ±0.1 K at 10…30 °C (HC2A-S-HH)

Diameter

15 mm (0.6")

Length

•108 mm (4.25")

•109 mm (4.3") (HC2A-SM)

Housing material

•Polycarbonate, black

•Stainless steel, DIN 1.4301 (HC2A-SM)

Standard filter

•Polyethylene, 40 µm

•Wiremesh filter, 10 μm, DIN 1.4401 (HC2A-SM)

•None (HC2A-S-HH)

Weight

•10 g (0.35 oz)

•47 g (1.65 oz) (HC2A-SM)

Power Supply

The HC2A requires a power supply of
3.3…5.0 VDC

Use of a voltage adapter allows powering the probe from a voltage source of

5.0...24 VDC or 5.0...16 VAC, see Cables.

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

Digital interface

The HC2A probe has a UART interface.

Communication protocol

•RO-ASCII: default communication protocol used by all AirChip 3000 devices.

•I2C: does not allow the networking of devices and is limited to a one way communication where HC2A automatically sends data during each refresh interval to an external device with I2C input.

•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.

The communication protocol can only be configured by HW5 software, see HygroClip2.

Adjustment

•1-point or multi-point humidity calibration or adjustment

•1-point or 2-point temperature calibration or adjustment

•Generate a time stamp for calibrations and adjustments

•Retain and view last adjustment date and adjustment values

•Generate calibration and adjustment protocols

Configurable settings

Factory default

Unit of measurement (metric/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

MODBUS address

0

Device name

HC2A

Functions

Factory default

Humidity/temperature adjustment

Enabling / Disabling

Device write protection

Disabled

Out-of-limit value digital alarm

Disabled

Data recording

Disabled

Fail safe mode

Disabled

Simulator mode

Disabled