User Manual

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)