3 General Description
3.1 Commissioning
HygroFlex5-EX (two-wire current loop, loop-powered): 10 ... 28 VDC depending on the loads connected to the
outputs. The minimum supply voltage can be calculated as follows:
V min = 10 V + (0.02 A x load*) *Load resistance in ohms.
The minimum supply voltage for the maximum load of 500 is 10 V + (0.02 A x 500 ) = 20 VDC. If both output
circuits are closed, the maximum current consumption is 40 mA.
The device must be properly closed when in operation in order to achieve explosion protection.
3.2 Calculated Parameters
The HygroFlex5-EX reads out the data of the connected probe.
The user can configure the HygroFlex5-EX with the ROTRONIC HW4 software to calculate one of the following
parameters:
o Dew point (Dp) above and below freezing point
o Frost point (Fp) below freezing point and dew point above freezing point
o Wet-bulb temperature (Tw)
o Enthalpy (H)
o Vapor concentration (Dv)
o Specific humidity (Q)
o Mixing ratio by weight (R)
o Vapor concentration at saturation (Dvs)
o Vapor partial pressure (E)
o Vapor saturation pressure (Ew)
Note: Some of the above-mentioned parameters depend on the value of the atmospheric air pressure.
The user can define a fixed atmospheric air pressure value with the ROTRONIC HW4 software.
3.3 Analog Output Signals
Using the ROTRONIC HW4 software, each of the two analog output signals can be assigned to one of the
following parameters:
Measured relative humidity (%RH)
Measured temperature (°C/°F)
Calculated parameter (see 3.2)
The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99.
The analog output signals are generated by 16-bit D/A converters.
3.4 Service Connector
The service connector (UART interface with mini-USB port) allows connection of the HygroFlex5-EX
to a PC running the ROTRONIC HW4 software. A service cable is needed for this. See chapter 7 “Maintenance”
for the location of the service connector and the type of service cable.
The service connector is used for configuration and for updating the firmware of the HygroFlex5-EX.
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