ROTRONIC HF8 - Manual (Page 31)

E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide Instruction Manual
Document Type
Page 31 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
10 Technical data
10.1 Specifications
General HF8
Device type
Humidity temperature transmitter with analog output signals
Optional relay outputs
Optional digital interface: USB, Ethernet, RS-485
Circuit type 3-wire
Power supply and connections HF8
Supply voltage options
(see product identification label)
15…40 VDC or 12…28 VAC, 50-60 Hz, not galvanically isolated
9…36 VDC or 7…24 VAC, 50-60 Hz, galvanically isolated
85…265 VAC, 5 Watt, 50-60 Hz, galvanically isolated
PoE (IEEE 802.3af compliant) – model with Ethernet only
Typical current consumption
Models with Ethernet interface: 300 mA
All other models: 150 mA
Electrical connections
Analog outputs, relay outputs, RS-485: terminal block and M16 cable grip or ½”
conduit adapter
Ethernet: connector
Polarity protection Protective diode on V+
Probe input options HF8
Number of probe inputs 2
Digital probe HygroClip 2 probe
Analog probe (12-bit AD converter)
Supply voltage to probe: 5 VDC
Maximum probe signal range: 0 to 3.3 VC
Configurable measuring range and measurement unit
Humidity and temperature
measurement
See document E-M-HC2 Probes > Specifications
Calculated parameters
HF8
Psychrometric calculations
Dew point (Dp) above and below freezing
Frost point (Fp) below freezing and dew point above freezing
Wet bulb temperature (Tw)
Enthalpy (H)
Vapor concentration (Dv)
Specific humidity (Q)
Mixing ratio by weight (R)
Vapor concentration at saturation (Dvs)
Vapor partial pressure (E)
Vapor saturation pressure (Ew)
User defined Custom Calculations (up to two)
Start-up time and data refresh rate
HF8
Start-up time 1.9 s (typical)
Data refresh rate 1 s (typical)