3 general description, 1 power supply, 2 measuring circuits and measured parameters – ROTRONIC HF62 User Manual

Page 7: 3 calculated parameters, 4 analog output signals, General description, Power supply, Measuring circuits and measured parameters, Calculated parameters, Analog output signals

E-M-HF62-V1_11

Rotronic AG
Bassersdorf, Switzerland

Document code

Unit

Instruction Manual

Document Type

HygroFlex HF62 Humidity Temperature
Transmitters: User Guide

Document title

Page 7 of 27

The display can be configured to show a trend indicator on each line:

▲: increasing value
▼: decreasing value

In the event of an alarm the display shows the symbol [ ! ] to the right of the value.

For instructions see the following HW4 manual: E-M-HW4v2-F2-008.

General description

3.1 Power supply

Each independent circuit of the HF62 (measuring circuit 1 and measuring circuit 2) requires a supply voltage
of 10…28 VDC - depending on the load connected to each circuit. If so desired, the same voltage source may
used for both circuits. For any of the two circuits, the minimum supply voltage can be determined as follows:

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

For the maximum load of 500

, the minimum supply voltage is 10 + (0.02 x 500) = 20 VDC. The maximum

current consumption is 20 mA per circuit in use.

3.2 Measuring circuits and measured parameters

Circuit 1 of the HF62 measures relative humidity with a ROTRONIC Hygromer

IN1 capacitive sensor and

uses the data from a Pt100 RTD to apply a correction for the effect of temperature on the humidity sensor.

Circuit 2 of the HF62 uses a separate Pt100 RTD to measure temperature.

3.3 Calculated parameters

Using the ROTRONIC HW4 software, measuring circuit 1 of the HF62 can be configured by the user to
calculate either the dew point or the frost point.

3.4 Analog output signals

By default, the output signal of the HF62 measuring circuit 1 corresponds to humidity. With the ROTRONIC
HW4 software the output signal provided by this circuit can be made to correspond to either relative humidity
or to the calculated parameter.

By default, the output signal of the HF62 measuring circuit 2 corresponds to temperature and this setting
should not be changed by the user.

If so desired, the analog output signal from any of the two independent circuits can also be disabled.

Using the ROTRONIC HW4 software, the scale of each analog output signal can be set within the numerical
limits of -999.99 and 9999.99.