3 measured parameters, 4 calculated psychrometric parameters, 5 custom calculations – ROTRONIC HF8 User Manual
Page 6: Measured parameters, Calculated psychrometric parameters, Custom calculations, E-m-hf8-v2_10
E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide
Instruction Manual
Document Type
Page 6 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
Pin-Out Diagram
3.3 Measured parameters
Depending on the configuration of the probe inputs, the HF8 can measure the following:
o
HygroClip 2 probe: humidity and temperature. The HC2 probes measure relative humidity with a
ROTRONIC Hygromer
®
IN1 capacitive sensor and temperature with a Pt100 RTD.
o
Analog probe (general): any parameter measured by the probe. The parameter unit must be
specified with the HW4 software (Device Manager).
o
Analog pressure probe: the unit used for barometric pressure is set with the HW4 software > Device
Manager > Unit System.
3.4 Calculated psychrometric parameters
When a probe input is configured to accept a HygroClip 2 digital probe, the HF8 can calculate any of the
following parameters based on the humidity and temperature values measured by the probe. To select the
calculated psychrometric parameter, use either the keypad or the HW4 software > Device Manager:
o
Dew point (Dp) above and below freezing
o
Frost point (Fp) below freezing and dew point above freezing
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: calculating some of the above parameters requires barometric pressure as an input parameter. When
no pressure probe is connected to the HF8, a fixed barometric pressure value can be specified using either
the keypad or the ROTRONIC HW4 software.
3.5 Custom Calculations
The ROTRONIC HW4 software version 3.2.0 or higher is required for setting up custom calculations and a
service cable is required to connect the HF8 to a PC running the HW4 software.
The HF8 allows the user to define up to two custom calculations based on measured values such as relative
humidity or on calculated parameters such as the dew point. Custom calculations are constantly updated by
the HF8 and can be shown on the local display and / or displayed on the monitor of a PC running the HW4
software.
1: RXD (UART- digital probe)
2: GND (digital and power)
3: V+: digital pbe: 3.3 VDC nominal, analog pbe: maximum 5.0 VDC, 10 mA
4: AGND (analog ground)
5: Not used
6: 1-channel analog probe signal : + 0.0 to 3.3 VDC
7: TXD (UART – digital probe)