ROTRONIC HF3 - Manual (Page 23)

E-M-HF3-V1_22
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF3 Transmitters and Thermo-
hygrostats: User Guide Instruction Manual
Document Type
Page 23 of 27
Document title
© 2009-2011; Rotronic AG E-M-HF3-V1_22
10 Technical data
10.1 Specifications
General
HF32 HF33 HF34
Device type Humidity temperature transmitter Thermo-hygrostat
Circuit type 2-wire, loop powered 3-wire
Mechanical configuration types D, R, S and W D and W
Power supply and connections HF32 HF33 HF34
Supply voltage (VDD)
10…28VDC
V min = 10 V + (0.02 x
Load*) *Load
resistance in ohms.
15…40 VDC or
12…28 VAC 8…40 VDC or
12…28 VAC
Nominal current consumption 2 x 20 mA < 50 mA < 50 mA
Electrical connections
Type D and W: terminal block and M16 cable grip
Type R and S: terminal block Type D and W: terminal
block and M16 cable grip
Polarity protection Protective diode on V+
Humidity measurement
HF32 HF33 HF34
Sensor ROTRONIC Hygromer ® IN1
Measuring range 0…100 %RH
Measurement accuracy at 23 °C ±2.0 %RH (Type D, S and W) / ± 1.0 %RH (Type R) ±2.0 %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
HF32 HF33 HF34
Sensor Pt100 RTD, IEC 751 1/3 class B
Measuring range -40 …60 °C / -40…140 °F
Measurement accuracy at 23 °C ±0.3 °C (Type D, S and W) / ±0.2 °C (Type R)
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
HF32 HF33 HF34
Psychrometric calculations Dew or frost point (user configurable option)
Start-up time and data refresh rate
HF32 HF33 HF34
Start-up time 3.4s (typical) 1.9s (typical)
Data refresh rate 3.4s (typical) 1.7s (typical)