ROTRONIC HF4 - Manual (Page 25)

E-M-HF4-V1_22
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF4 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 25 of 29
Document title
© 2009-2011; Rotronic AG E-M-HF4-V1_22
10 Technical data
10.1 Specifications
General HF42 HF43 HF45
Device type
Humidity temperature transmitter with analog output
signals
Humidity temperature
transmitter with digital
output
Circuit type 2-wire, loop powered 3-wire
Mechanical configuration types D and W
Power supply and connections HF42 HF43 HF45
Supply voltage (VDD)
10…28VDC
V min = 10 V + (0.02 x
Load*) *Load
resistance in ohms.
15…40 VDC or
12…28 VAC 5…40 VDC
or 12…28 VAC
Nominal current consumption 2 x 20 mA < 50 mA
Model with USB
interface: 50 mA
Model with Ethernet
interface: 300 mA
Electrical connections
Terminal block and M16 cable grip or ½” conduit
adapter
Connector (USB or
Ethernet), terminal block
(power supply and RS-
485) and M16 cable grip
or ½” conduit adapter
Polarity protection Protective diode on V+
Humidity measurement
HF42 HF43 HF45
Sensor ROTRONIC Hygromer ® IN1
Measuring range 0…100 %RH
Measurement accuracy at 23 °C ±1.0 %RH
Repeatability 0.3 %RH
Long term stability < 1 %RH / year
Sensor time constant Typical 10 sec, 63% of a 35 to 80 %RH step change (1m/sec air flow at sensor)
Temperature measurement
HF42 HF43 HF45
Sensor Pt100 RTD, IEC 751 1/3 class B
Measuring range limits -50 …100 °C / -58…212 °F
Measurement accuracy at 23 °C ±0.2 °C
Repeatability 0.05°C
Long term stability < 0.1°C / year
Sensor time constant Typical 4 sec, 63% of a step change (1m/sec air flow at sensor)
Calculated parameters
HF42 HF43 HF45
Psychrometric calculations Dew or frost point (user configurable option)