ROTRONIC HF4 - Manual (Page 6)

E-M-HF4-V1_22
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF4 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 6 of 29
Document title
© 2009-2011; Rotronic AG E-M-HF4-V1_22
3.3 Calculated parameters
Using the ROTRONIC HW4 software, the HF4 can be configured by the user to calculate either the dew point
or the frost point.
3.4 Analog output signals (HF42 and HF43)
HF42 and HF43
With the ROTRONIC HW4 software any of the two analog output signals can be made to correspond to one of
the following:
Relative humidity
Temperature
Dew or frost point
Any output can also be disabled.
The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99.
The D/A converters used to generate the analog output signals feature a 16-bit resolution.
The D/A converters used to generate the analog output signals feature a 16-bit resolution and exhibit a small
positive offset at the bottom of the signal range as indicated below:.
Signal type
Maximum offset at range bottom
0…1 V 3 mV
0…5 V 50 mV
0…10 V 90 mV
0…20 mA 4 µA
4…20 mA No offset
HF43
The ROTRONIC HW4 software allows changing the type of output signal to one
of the following: 0…20 mA,
4…20 mA, 0…1V, 0…5V or 0…10V. Both output signals are automatically configured with the same signal
type. No calibration or adjustment is required after changing the type of output signal.
In the case of voltage output signals, load requirements apply to the external device or circuit connected to the
HF43 transmitter. These requirements are defined in the “Operation” chapter