4 measured parameters, 5 calculated parameters, Measured parameters – ROTRONIC HP23-AW-A User Manual
Page 7: Calculated parameters
E-M-HP23-V2_13
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP23-A / HP23-AW-A hand-held
indicator:
User Guide
Instruction Manual
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Page
7 of 37
Document title
© 2009-2012; Rotronic AG E-M-HP23-V2_13
Pin-Out Diagram
2.4 Measured parameters
Depending on the configuration of the probe inputs, the HP23 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.
2.5 Calculated parameters
When a probe input is configured to accept a HygroClip 2 digital probe, the HP23 can calculate any of the
following parameters based on the humidity and temperature values measured by the probe (to select the
calculated 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 HP23, a fixed barometric pressure value can be specified using either
the keypad or the ROTRONIC HW4 software.
In addition, the HP23 can display the difference between two probes or up to two user defined calculations
such as the difference between the temperature and the dew point measured by a probe, the average of the
temperature measured by two probes, etc. (see Display in this manual)
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)