ROTRONIC HF7 - Manual (Page 20)

E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 20 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
10 Technical data
10.1 Specifications
General HF72 HF73
Device type Humidity temperature transmitter with analog output signals
Circuit type 2-wire, loop powered 3-wire
Mechanical configuration types N, D, A and W
Power supply and connections HF72 HF73
Supply voltage (VDD)
10…28VDC
V min = 10 V + (0.02 x Load*) *Load
resistance in ohms.
15…40 VDC or
12…28 VAC
Nominal current consumption 2 x 20 mA < 50 mA
Electrical connections Terminal block and M16 cable grip or ½” conduit adapter
Polarity protection Protective diode on V+
Humidity measurement
HF72 HF73
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
HF72 HF73
Sensor Pt100 RTD, IEC 751 1/3 class B
Measuring range limits - 100…150 °C / -148…302 °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
HF72 HF73
Psychrometric calculations Dew or frost point (user configurable option)